Java/2D Graphics GUI/Color
Содержание
- 1 140 colors - defined for X Window System listed in O"Reilly html pocket reference 87pp
- 2 An efficient color quantization algorithm
- 3 Color class is used to work with colors in Java 2D
- 4 Color Difference
- 5 Color Factory
- 6 Color fading animation
- 7 Color Util
- 8 Color Utilities: common color operations
- 9 Common color utilities
- 10 Converts a given string into a color.
- 11 Converts the String representation of a color to an actual Color object.
- 12 Derives a color by adding the specified offsets to the base color"s hue, saturation, and brightness values
- 13 Drawing with Color
- 14 If the color is equal to one of the defined constant colors, that name is returned instead.
- 15 Map colors into names and vice versa.
- 16 Rainbow Color
- 17 Utility for checking colors given either hexa or natural language string descriptions.
- 18 XOR color
140 colors - defined for X Window System listed in O"Reilly html pocket reference 87pp
<source lang="java"> /*
- Caramel - Non-GUI Java Addons
- Copyright (c) 2001, 2002, 2003 by Gerald Bauer
- This program is free software.
- You may redistribute it and/or modify it under the terms of the GNU
- Lesser General Public License as published by the Free Software Foundation.
- Version 2.1 of the license should be included with this distribution in
- the file LICENSE, as well as License.html. If the license is not
- included with this distribution, you may find a copy at the FSF web
- site at "www.gnu.org" or "www.fsf.org", or you may write to the
- Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139 USA.
- THIS SOFTWARE IS PROVIDED AS-IS WITHOUT WARRANTY OF ANY KIND,
- NOT EVEN THE IMPLIED WARRANTY OF MERCHANTABILITY. THE AUTHOR
- OF THIS SOFTWARE, ASSUMES _NO_ RESPONSIBILITY FOR ANY
- CONSEQUENCE RESULTING FROM THE USE, MODIFICATION, OR
- REDISTRIBUTION OF THIS SOFTWARE.
- /
import java.awt.*; import java.util.*; /**
* 140 colors - defined for X Window System listed in O"Reilly html pocket * reference 87pp */
public class ColorUtils {
public final static Color aliceblue = new Color( 240, 248, 255 );
public final static Color antiquewhite = new Color( 250, 235, 215 );
public final static Color aqua = new Color( 0, 255, 255 );
public final static Color aquamarine = new Color( 127, 255, 212 );
public final static Color azure = new Color( 240, 255, 255 );
public final static Color beige = new Color( 245, 245, 220 );
public final static Color bisque = new Color( 255, 228, 196 );
public final static Color black = new Color( 0, 0, 0 );
public final static Color blanchedalmond = new Color( 255, 255, 205 );
public final static Color blue = new Color( 0, 0, 255 );
public final static Color blueviolet = new Color( 138, 43, 226 );
public final static Color brown = new Color( 165, 42, 42 );
public final static Color burlywood = new Color( 222, 184, 135 );
public final static Color cadetblue = new Color( 95, 158, 160 );
public final static Color chartreuse = new Color( 127, 255, 0 );
public final static Color chocolate = new Color( 210, 105, 30 );
public final static Color coral = new Color( 255, 127, 80 );
public final static Color cornflowerblue = new Color( 100, 149, 237 );
public final static Color cornsilk = new Color( 255, 248, 220 );
public final static Color crimson = new Color( 220, 20, 60 );
public final static Color cyan = new Color( 0, 255, 255 );
public final static Color darkblue = new Color( 0, 0, 139 );
public final static Color darkcyan = new Color( 0, 139, 139 );
public final static Color darkgoldenrod = new Color( 184, 134, 11 );
public final static Color darkgray = new Color( 169, 169, 169 );
public final static Color darkgreen = new Color( 0, 100, 0 );
public final static Color darkkhaki = new Color( 189, 183, 107 );
public final static Color darkmagenta = new Color( 139, 0, 139 );
public final static Color darkolivegreen = new Color( 85, 107, 47 );
public final static Color darkorange = new Color( 255, 140, 0 );
public final static Color darkorchid = new Color( 153, 50, 204 );
public final static Color darkred = new Color( 139, 0, 0 );
public final static Color darksalmon = new Color( 233, 150, 122 );
public final static Color darkseagreen = new Color( 143, 188, 143 );
public final static Color darkslateblue = new Color( 72, 61, 139 );
public final static Color darkslategray = new Color( 47, 79, 79 );
public final static Color darkturquoise = new Color( 0, 206, 209 );
public final static Color darkviolet = new Color( 148, 0, 211 );
public final static Color deeppink = new Color( 255, 20, 147 );
public final static Color deepskyblue = new Color( 0, 191, 255 );
public final static Color dimgray = new Color( 105, 105, 105 );
public final static Color dodgerblue = new Color( 30, 144, 255 );
public final static Color firebrick = new Color( 178, 34, 34 );
public final static Color floralwhite = new Color( 255, 250, 240 );
public final static Color forestgreen = new Color( 34, 139, 34 );
public final static Color fuchsia = new Color( 255, 0, 255 );
public final static Color gainsboro = new Color( 220, 220, 220 );
public final static Color ghostwhite = new Color( 248, 248, 255 );
public final static Color gold = new Color( 255, 215, 0 );
public final static Color goldenrod = new Color( 218, 165, 32 );
public final static Color gray = new Color( 128, 128, 128 );
public final static Color green = new Color( 0, 128, 0 );
public final static Color greenyellow = new Color( 173, 255, 47 );
public final static Color honeydew = new Color( 240, 255, 240 );
public final static Color hotpink = new Color( 255, 105, 180 );
public final static Color indianred = new Color( 205, 92, 92 );
public final static Color indigo = new Color( 75, 0, 130 );
public final static Color ivory = new Color( 255, 240, 240 );
public final static Color khaki = new Color( 240, 230, 140 );
public final static Color lavender = new Color( 230, 230, 250 );
public final static Color lavenderblush = new Color( 255, 240, 245 );
public final static Color lawngreen = new Color( 124, 252, 0 );
public final static Color lemonchiffon = new Color( 255, 250, 205 );
public final static Color lightblue = new Color( 173, 216, 230 );
public final static Color lightcoral = new Color( 240, 128, 128 );
public final static Color lightcyan = new Color( 224, 255, 255 );
public final static Color lightgoldenrodyellow = new Color( 250, 250, 210 );
public final static Color lightgreen = new Color( 144, 238, 144 );
public final static Color lightgrey = new Color( 211, 211, 211 );
public final static Color lightpink = new Color( 255, 182, 193 );
public final static Color lightsalmon = new Color( 255, 160, 122 );
public final static Color lightseagreen = new Color( 32, 178, 170 );
public final static Color lightskyblue = new Color( 135, 206, 250 );
public final static Color lightslategray = new Color( 119, 136, 153 );
public final static Color lightsteelblue = new Color( 176, 196, 222 );
public final static Color lightyellow = new Color( 255, 255, 224 );
public final static Color lime = new Color( 0, 255, 0 );
public final static Color limegreen = new Color( 50, 205, 50 );
public final static Color linen = new Color( 250, 240, 230 );
public final static Color magenta = new Color( 255, 0, 255 );
public final static Color maroon = new Color( 128, 0, 0 );
public final static Color mediumaquamarine = new Color( 102, 205, 170 );
public final static Color mediumblue = new Color( 0, 0, 205 );
public final static Color mediumorchid = new Color( 186, 85, 211 );
public final static Color mediumpurple = new Color( 147, 112, 219 );
public final static Color mediumseagreen = new Color( 60, 179, 113 );
public final static Color mediumslateblue = new Color( 123, 104, 238 );
public final static Color mediumspringgreen = new Color( 0, 250, 154 );
public final static Color mediumturquoise = new Color( 72, 209, 204 );
public final static Color mediumvioletred = new Color( 199, 21, 133 );
public final static Color midnightblue = new Color( 25, 25, 112 );
public final static Color mintcream = new Color( 245, 255, 250 );
public final static Color mistyrose = new Color( 255, 228, 225 );
public final static Color mocassin = new Color( 255, 228, 181 );
public final static Color navajowhite = new Color( 255, 222, 173 );
public final static Color navy = new Color( 0, 0, 128 );
public final static Color oldlace = new Color( 253, 245, 230 );
public final static Color olive = new Color( 128, 128, 0 );
public final static Color olivedrab = new Color( 107, 142, 35 );
public final static Color orange = new Color( 255, 165, 0 );
public final static Color orangered = new Color( 255, 69, 0 );
public final static Color orchid = new Color( 218, 112, 214 );
public final static Color palegoldenrod = new Color( 238, 232, 170 );
public final static Color palegreen = new Color( 152, 251, 152 );
public final static Color paleturquoise = new Color( 175, 238, 238 );
public final static Color palevioletred = new Color( 219, 112, 147 );
public final static Color papayawhip = new Color( 255, 239, 213 );
public final static Color peachpuff = new Color( 255, 218, 185 );
public final static Color peru = new Color( 205, 133, 63 );
public final static Color pink = new Color( 255, 192, 203 );
public final static Color plum = new Color( 221, 160, 221 );
public final static Color powderblue = new Color( 176, 224, 230 );
public final static Color purple = new Color( 128, 0, 128 );
public final static Color red = new Color( 255, 0, 0 );
public final static Color rosybrown = new Color( 188, 143, 143 );
public final static Color royalblue = new Color( 65, 105, 225 );
public final static Color saddlebrown = new Color( 139, 69, 19 );
public final static Color salmon = new Color( 250, 128, 114 );
public final static Color sandybrown = new Color( 244, 164, 96 );
public final static Color seagreen = new Color( 46, 139, 87 );
public final static Color seashell = new Color( 255, 245, 238 );
public final static Color sienna = new Color( 160, 82, 45 );
public final static Color silver = new Color( 192, 192, 192 );
public final static Color skyblue = new Color( 135, 206, 235 );
public final static Color slateblue = new Color( 106, 90, 205 );
public final static Color slategray = new Color( 112, 128, 144 );
public final static Color snow = new Color( 255, 250, 250 );
public final static Color springgreen = new Color( 0, 255, 127 );
public final static Color steelblue = new Color( 70, 138, 180 );
public final static Color tan = new Color( 210, 180, 140 );
public final static Color teal = new Color( 0, 128, 128 );
public final static Color thistle = new Color( 216, 191, 216 );
public final static Color tomato = new Color( 253, 99, 71 );
public final static Color turquoise = new Color( 64, 224, 208 );
public final static Color violet = new Color( 238, 130, 238 );
public final static Color wheat = new Color( 245, 222, 179 );
public final static Color white = new Color( 255, 255, 255 );
public final static Color whitesmoke = new Color( 245, 245, 245 );
public final static Color yellow = new Color( 255, 255, 0 );
public final static Color yellowgreen = new Color( 154, 205, 50 );
private static HashMap _colors;
private static Object[][] data =
{
{"aliceblue", aliceblue},
{"antiquewhite", antiquewhite},
{"aqua", aqua},
{"aquamarine", aquamarine},
{"azure", azure},
{"beige", beige},
{"bisque", bisque},
{"black", black},
{"blanchedalmond", blanchedalmond},
{"blue", blue},
{"blueviolet", blueviolet},
{"brown", brown},
{"burlywood", burlywood},
{"cadetblue", cadetblue},
{"chartreuse", chartreuse},
{"chocolate", chocolate},
{"coral", coral},
{"cornflowerblue", cornflowerblue},
{"cornsilk", cornsilk},
{"crimson", crimson},
{"cyan", cyan},
{"darkblue", darkblue},
{"darkcyan", darkcyan},
{"darkgoldenrod", darkgoldenrod},
{"darkgray", darkgray},
{"darkgreen", darkgreen},
{"darkkhaki", darkkhaki},
{"darkmagenta", darkmagenta},
{"darkolivegreen", darkolivegreen},
{"darkorange", darkorange},
{"darkorchid", darkorchid},
{"darkred", darkred},
{"darksalmon", darksalmon},
{"darkseagreen", darkseagreen},
{"darkslateblue", darkslateblue},
{"darkslategray", darkslategray},
{"darkturquoise", darkturquoise},
{"darkviolet", darkviolet},
{"deeppink", deeppink},
{"deepskyblue", deepskyblue},
{"dimgray", dimgray},
{"dodgerblue", dodgerblue},
{"firebrick", firebrick},
{"floralwhite", floralwhite},
{"forestgreen", forestgreen},
{"fuchsia", fuchsia},
{"gainsboro", gainsboro},
{"ghostwhite", ghostwhite},
{"gold", gold},
{"goldenrod", goldenrod},
{"gray", gray},
{"green", green},
{"greenyellow", greenyellow},
{"honeydew", honeydew},
{"hotpink", hotpink},
{"indianred", indianred},
{"indigo", indigo},
{"ivory", ivory},
{"khaki", khaki},
{"lavender", lavender},
{"lavenderblush", lavenderblush},
{"lawngreen", lawngreen},
{"lemonchiffon", lemonchiffon},
{"lightblue", lightblue},
{"lightcoral", lightcoral},
{"lightcyan", lightcyan},
{"lightgoldenrodyellow", lightgoldenrodyellow},
{"lightgreen", lightgreen},
{"lightgrey", lightgrey},
{"lightpink", lightpink},
{"lightsalmon", lightsalmon},
{"lightseagreen", lightseagreen},
{"lightskyblue", lightskyblue},
{"lightslategray", lightslategray},
{"lightsteelblue", lightsteelblue},
{"lightyellow", lightyellow},
{"lime", lime},
{"limegreen", limegreen},
{"linen", linen},
{"magenta", magenta},
{"maroon", maroon},
{"mediumaquamarine", mediumaquamarine},
{"mediumblue", mediumblue},
{"mediumorchid", mediumorchid},
{"mediumpurple", mediumpurple},
{"mediumseagreen", mediumseagreen},
{"mediumslateblue", mediumslateblue},
{"mediumspringgreen", mediumspringgreen},
{"mediumturquoise", mediumturquoise},
{"mediumvioletred", mediumvioletred},
{"midnightblue", midnightblue},
{"mintcream", mintcream},
{"mistyrose", mistyrose},
{"moccasin", mocassin},
{"navajowhite", navajowhite},
{"navy", navy},
{"oldlace", oldlace},
{"olive", olive},
{"olivedrab", olivedrab},
{"orange", orange},
{"orangered", orangered},
{"orchid", orchid},
{"palegoldenrod", palegoldenrod},
{"palegreen", palegreen},
{"paleturquoise", paleturquoise},
{"palevioletred", palevioletred},
{"papayawhip", papayawhip},
{"peachpuff", peachpuff},
{"peru", peru},
{"pink", pink},
{"plum", plum},
{"powderblue", powderblue},
{"purple", purple},
{"red", red},
{"rosybrown", rosybrown},
{"royalblue", royalblue},
{"saddlebrown", saddlebrown},
{"salmon", salmon},
{"sandybrown", sandybrown},
{"seagreen", seagreen},
{"seashell", seashell},
{"sienna", sienna},
{"silver", silver},
{"skyblue", skyblue},
{"slateblue", slateblue},
{"slategray", slategray},
{"snow", snow},
{"springgreen", springgreen},
{"steelblue", steelblue},
{"tan", tan},
{"teal", teal},
{"thistle", thistle},
{"tomato", tomato},
{"turquoise", turquoise},
{"violet", violet},
{"wheat", wheat},
{"white", white},
{"whitesmoke", whitesmoke},
{"yellow", yellow},
{"yellowgreen", yellowgreen},
};
public static HashMap getColors()
{
return _colors;
}
public static Color findColor( String key )
{
return ( Color ) _colors.get( key );
}
static
{
_colors = new HashMap();
for( int i = 0; i < data.length; i++ )
{
Object row[] = data[i];
_colors.put( row[0], row[1] );
}
}
}
</source>
An efficient color quantization algorithm
<source lang="java"> /*
* @(#)Quantize.java 0.90 9/19/00 Adam Doppelt */
/**
* An efficient color quantization algorithm, adapted from the C++ * implementation quantize.c in */
public class Quantize { /* %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % % % % % % % QQQ U U AAA N N TTTTT IIIII ZZZZZ EEEEE % % Q Q U U A A NN N T I ZZ E % % Q Q U U AAAAA N N N T I ZZZ EEEEE % % Q QQ U U A A N NN T I ZZ E % % QQQQ UUU A A N N T IIIII ZZZZZ EEEEE % % % % % % Reduce the Number of Unique Colors in an Image % % % % % % Software Design % % John Cristy % % July 1992 % % % % % % Copyright 1998 E. I. du Pont de Nemours and Company % % % % Permission is hereby granted, free of charge, to any person obtaining a % % copy of this software and associated documentation files ("ImageMagick"), % % to deal in ImageMagick without restriction, including without limitation % % the rights to use, copy, modify, merge, publish, distribute, sublicense, % % and/or sell copies of ImageMagick, and to permit persons to whom the % % ImageMagick is furnished to do so, subject to the following conditions: % % % % The above copyright notice and this permission notice shall be included in % % all copies or substantial portions of ImageMagick. % % % % The software is provided "as is", without warranty of any kind, express or % % implied, including but not limited to the warranties of merchantability, % % fitness for a particular purpose and noninfringement. In no event shall % % E. I. du Pont de Nemours and Company be liable for any claim, damages or % % other liability, whether in an action of contract, tort or otherwise, % % arising from, out of or in connection with ImageMagick or the use or other % % dealings in ImageMagick. % % % % Except as contained in this notice, the name of the E. I. du Pont de % % Nemours and Company shall not be used in advertising or otherwise to % % promote the sale, use or other dealings in ImageMagick without prior % % written authorization from the E. I. du Pont de Nemours and Company. % % % %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % % Realism in computer graphics typically requires using 24 bits/pixel to % generate an image. Yet many graphic display devices do not contain % the amount of memory necessary to match the spatial and color % resolution of the human eye. The QUANTIZE program takes a 24 bit % image and reduces the number of colors so it can be displayed on % raster device with less bits per pixel. In most instances, the % quantized image closely resembles the original reference image. % % A reduction of colors in an image is also desirable for image % transmission and real-time animation. % % Function Quantize takes a standard RGB or monochrome images and quantizes % them down to some fixed number of colors. % % For purposes of color allocation, an image is a set of n pixels, where % each pixel is a point in RGB space. RGB space is a 3-dimensional % vector space, and each pixel, pi, is defined by an ordered triple of % red, green, and blue coordinates, (ri, gi, bi). % % Each primary color component (red, green, or blue) represents an % intensity which varies linearly from 0 to a maximum value, cmax, which % corresponds to full saturation of that color. Color allocation is % defined over a domain consisting of the cube in RGB space with % opposite vertices at (0,0,0) and (cmax,cmax,cmax). QUANTIZE requires % cmax = 255. % % The algorithm maps this domain onto a tree in which each node % represents a cube within that domain. In the following discussion % these cubes are defined by the coordinate of two opposite vertices: % The vertex nearest the origin in RGB space and the vertex farthest % from the origin. % % The tree"s root node represents the the entire domain, (0,0,0) through % (cmax,cmax,cmax). Each lower level in the tree is generated by % subdividing one node"s cube into eight smaller cubes of equal size. % This corresponds to bisecting the parent cube with planes passing % through the midpoints of each edge. % % The basic algorithm operates in three phases: Classification, % Reduction, and Assignment. Classification builds a color % description tree for the image. Reduction collapses the tree until % the number it represents, at most, the number of colors desired in the % output image. Assignment defines the output image"s color map and % sets each pixel"s color by reclassification in the reduced tree. % Our goal is to minimize the numerical discrepancies between the original % colors and quantized colors (quantization error). % % Classification begins by initializing a color description tree of % sufficient depth to represent each possible input color in a leaf. % However, it is impractical to generate a fully-formed color % description tree in the classification phase for realistic values of % cmax. If colors components in the input image are quantized to k-bit % precision, so that cmax= 2k-1, the tree would need k levels below the % root node to allow representing each possible input color in a leaf. % This becomes prohibitive because the tree"s total number of nodes is % 1 + sum(i=1,k,8k). % % A complete tree would require 19,173,961 nodes for k = 8, cmax = 255. % Therefore, to avoid building a fully populated tree, QUANTIZE: (1) % Initializes data structures for nodes only as they are needed; (2) % Chooses a maximum depth for the tree as a function of the desired % number of colors in the output image (currently log2(colormap size)). % % For each pixel in the input image, classification scans downward from % the root of the color description tree. At each level of the tree it % identifies the single node which represents a cube in RGB space % containing the pixel"s color. It updates the following data for each % such node: % % n1: Number of pixels whose color is contained in the RGB cube % which this node represents; % % n2: Number of pixels whose color is not represented in a node at % lower depth in the tree; initially, n2 = 0 for all nodes except % leaves of the tree. % % Sr, Sg, Sb: Sums of the red, green, and blue component values for % all pixels not classified at a lower depth. The combination of % these sums and n2 will ultimately characterize the mean color of a % set of pixels represented by this node. % % E: The distance squared in RGB space between each pixel contained % within a node and the nodes" center. This represents the quantization % error for a node. % % Reduction repeatedly prunes the tree until the number of nodes with % n2 > 0 is less than or equal to the maximum number of colors allowed % in the output image. On any given iteration over the tree, it selects % those nodes whose E count is minimal for pruning and merges their % color statistics upward. It uses a pruning threshold, Ep, to govern % node selection as follows: % % Ep = 0 % while number of nodes with (n2 > 0) > required maximum number of colors % prune all nodes such that E <= Ep % Set Ep to minimum E in remaining nodes % % This has the effect of minimizing any quantization error when merging % two nodes together. % % When a node to be pruned has offspring, the pruning procedure invokes % itself recursively in order to prune the tree from the leaves upward. % n2, Sr, Sg, and Sb in a node being pruned are always added to the % corresponding data in that node"s parent. This retains the pruned % node"s color characteristics for later averaging. % % For each node, n2 pixels exist for which that node represents the % smallest volume in RGB space containing those pixel"s colors. When n2 % > 0 the node will uniquely define a color in the output image. At the % beginning of reduction, n2 = 0 for all nodes except a the leaves of % the tree which represent colors present in the input image. % % The other pixel count, n1, indicates the total number of colors % within the cubic volume which the node represents. This includes n1 - % n2 pixels whose colors should be defined by nodes at a lower level in % the tree. % % Assignment generates the output image from the pruned tree. The % output image consists of two parts: (1) A color map, which is an % array of color descriptions (RGB triples) for each color present in % the output image; (2) A pixel array, which represents each pixel as % an index into the color map array. % % First, the assignment phase makes one pass over the pruned color % description tree to establish the image"s color map. For each node % with n2 > 0, it divides Sr, Sg, and Sb by n2 . This produces the % mean color of all pixels that classify no lower than this node. Each % of these colors becomes an entry in the color map. % % Finally, the assignment phase reclassifies each pixel in the pruned % tree to identify the deepest node containing the pixel"s color. The % pixel"s value in the pixel array becomes the index of this node"s mean % color in the color map. % % With the permission of USC Information Sciences Institute, 4676 Admiralty % Way, Marina del Rey, California 90292, this code was adapted from module % ALCOLS written by Paul Raveling. % % The names of ISI and USC are not used in advertising or publicity % pertaining to distribution of the software without prior specific % written permission from ISI. %
- /
final static boolean QUICK = true;
final static int MAX_RGB = 255;
final static int MAX_NODES = 266817;
final static int MAX_TREE_DEPTH = 8;
// these are precomputed in advance
static int SQUARES[];
static int SHIFT[];
static {
SQUARES = new int[MAX_RGB + MAX_RGB + 1];
for (int i= -MAX_RGB; i <= MAX_RGB; i++) {
SQUARES[i + MAX_RGB] = i * i;
}
SHIFT = new int[MAX_TREE_DEPTH + 1];
for (int i = 0; i < MAX_TREE_DEPTH + 1; ++i) {
SHIFT[i] = 1 << (15 - i);
}
}
/**
* Reduce the image to the given number of colors. The pixels are
* reduced in place.
* @return The new color palette.
*/
public static int[] quantizeImage(int pixels[][], int max_colors) {
Cube cube = new Cube(pixels, max_colors);
cube.classification();
cube.reduction();
cube.assignment();
return cube.colormap;
}
static class Cube {
int pixels[][];
int max_colors;
int colormap[];
Node root;
int depth;
// counter for the number of colors in the cube. this gets
// recalculated often.
int colors;
// counter for the number of nodes in the tree
int nodes;
Cube(int pixels[][], int max_colors) {
this.pixels = pixels;
this.max_colors = max_colors;
int i = max_colors;
// tree_depth = log max_colors
// 4
for (depth = 1; i != 0; depth++) {
i /= 4;
}
if (depth > 1) {
--depth;
}
if (depth > MAX_TREE_DEPTH) {
depth = MAX_TREE_DEPTH;
} else if (depth < 2) {
depth = 2;
}
root = new Node(this);
}
/*
* Procedure Classification begins by initializing a color
* description tree of sufficient depth to represent each
* possible input color in a leaf. However, it is impractical
* to generate a fully-formed color description tree in the
* classification phase for realistic values of cmax. If
* colors components in the input image are quantized to k-bit
* precision, so that cmax= 2k-1, the tree would need k levels
* below the root node to allow representing each possible
* input color in a leaf. This becomes prohibitive because the
* tree"s total number of nodes is 1 + sum(i=1,k,8k).
*
* A complete tree would require 19,173,961 nodes for k = 8,
* cmax = 255. Therefore, to avoid building a fully populated
* tree, QUANTIZE: (1) Initializes data structures for nodes
* only as they are needed; (2) Chooses a maximum depth for
* the tree as a function of the desired number of colors in
* the output image (currently log2(colormap size)).
*
* For each pixel in the input image, classification scans
* downward from the root of the color description tree. At
* each level of the tree it identifies the single node which
* represents a cube in RGB space containing It updates the
* following data for each such node:
*
* number_pixels : Number of pixels whose color is contained
* in the RGB cube which this node represents;
*
* unique : Number of pixels whose color is not represented
* in a node at lower depth in the tree; initially, n2 = 0
* for all nodes except leaves of the tree.
*
* total_red/green/blue : Sums of the red, green, and blue
* component values for all pixels not classified at a lower
* depth. The combination of these sums and n2 will
* ultimately characterize the mean color of a set of pixels
* represented by this node.
*/
void classification() {
int pixels[][] = this.pixels;
int width = pixels.length;
int height = pixels[0].length;
// convert to indexed color
for (int x = width; x-- > 0; ) {
for (int y = height; y-- > 0; ) {
int pixel = pixels[x][y];
int red = (pixel >> 16) & 0xFF;
int green = (pixel >> 8) & 0xFF;
int blue = (pixel >> 0) & 0xFF;
// a hard limit on the number of nodes in the tree
if (nodes > MAX_NODES) {
System.out.println("pruning");
root.pruneLevel();
--depth;
}
// walk the tree to depth, increasing the
// number_pixels count for each node
Node node = root;
for (int level = 1; level <= depth; ++level) {
int id = (((red > node.mid_red ? 1 : 0) << 0) |
((green > node.mid_green ? 1 : 0) << 1) |
((blue > node.mid_blue ? 1 : 0) << 2));
if (node.child[id] == null) {
new Node(node, id, level);
}
node = node.child[id];
node.number_pixels += SHIFT[level];
}
++node.unique;
node.total_red += red;
node.total_green += green;
node.total_blue += blue;
}
}
}
/*
* reduction repeatedly prunes the tree until the number of
* nodes with unique > 0 is less than or equal to the maximum
* number of colors allowed in the output image.
*
* When a node to be pruned has offspring, the pruning
* procedure invokes itself recursively in order to prune the
* tree from the leaves upward. The statistics of the node
* being pruned are always added to the corresponding data in
* that node"s parent. This retains the pruned node"s color
* characteristics for later averaging.
*/
void reduction() {
int threshold = 1;
while (colors > max_colors) {
colors = 0;
threshold = root.reduce(threshold, Integer.MAX_VALUE);
}
}
/**
* The result of a closest color search.
*/
static class Search {
int distance;
int color_number;
}
/*
* Procedure assignment generates the output image from the
* pruned tree. The output image consists of two parts: (1) A
* color map, which is an array of color descriptions (RGB
* triples) for each color present in the output image; (2) A
* pixel array, which represents each pixel as an index into
* the color map array.
*
* First, the assignment phase makes one pass over the pruned
* color description tree to establish the image"s color map.
* For each node with n2 > 0, it divides Sr, Sg, and Sb by n2.
* This produces the mean color of all pixels that classify no
* lower than this node. Each of these colors becomes an entry
* in the color map.
*
* Finally, the assignment phase reclassifies each pixel in
* the pruned tree to identify the deepest node containing the
* pixel"s color. The pixel"s value in the pixel array becomes
* the index of this node"s mean color in the color map.
*/
void assignment() {
colormap = new int[colors];
colors = 0;
root.colormap();
int pixels[][] = this.pixels;
int width = pixels.length;
int height = pixels[0].length;
Search search = new Search();
// convert to indexed color
for (int x = width; x-- > 0; ) {
for (int y = height; y-- > 0; ) {
int pixel = pixels[x][y];
int red = (pixel >> 16) & 0xFF;
int green = (pixel >> 8) & 0xFF;
int blue = (pixel >> 0) & 0xFF;
// walk the tree to find the cube containing that color
Node node = root;
for ( ; ; ) {
int id = (((red > node.mid_red ? 1 : 0) << 0) |
((green > node.mid_green ? 1 : 0) << 1) |
((blue > node.mid_blue ? 1 : 0) << 2) );
if (node.child[id] == null) {
break;
}
node = node.child[id];
}
if (QUICK) {
// if QUICK is set, just use that
// node. Strictly speaking, this isn"t
// necessarily best match.
pixels[x][y] = node.color_number;
} else {
// Find the closest color.
search.distance = Integer.MAX_VALUE;
node.parent.closestColor(red, green, blue, search);
pixels[x][y] = search.color_number;
}
}
}
}
/**
* A single Node in the tree.
*/
static class Node {
Cube cube;
// parent node
Node parent;
// child nodes
Node child[];
int nchild;
// our index within our parent
int id;
// our level within the tree
int level;
// our color midpoint
int mid_red;
int mid_green;
int mid_blue;
// the pixel count for this node and all children
int number_pixels;
// the pixel count for this node
int unique;
// the sum of all pixels contained in this node
int total_red;
int total_green;
int total_blue;
// used to build the colormap
int color_number;
Node(Cube cube) {
this.cube = cube;
this.parent = this;
this.child = new Node[8];
this.id = 0;
this.level = 0;
this.number_pixels = Integer.MAX_VALUE;
this.mid_red = (MAX_RGB + 1) >> 1;
this.mid_green = (MAX_RGB + 1) >> 1;
this.mid_blue = (MAX_RGB + 1) >> 1;
}
Node(Node parent, int id, int level) {
this.cube = parent.cube;
this.parent = parent;
this.child = new Node[8];
this.id = id;
this.level = level;
// add to the cube
++cube.nodes;
if (level == cube.depth) {
++cube.colors;
}
// add to the parent
++parent.nchild;
parent.child[id] = this;
// figure out our midpoint
int bi = (1 << (MAX_TREE_DEPTH - level)) >> 1;
mid_red = parent.mid_red + ((id & 1) > 0 ? bi : -bi);
mid_green = parent.mid_green + ((id & 2) > 0 ? bi : -bi);
mid_blue = parent.mid_blue + ((id & 4) > 0 ? bi : -bi);
}
/**
* Remove this child node, and make sure our parent
* absorbs our pixel statistics.
*/
void pruneChild() {
--parent.nchild;
parent.unique += unique;
parent.total_red += total_red;
parent.total_green += total_green;
parent.total_blue += total_blue;
parent.child[id] = null;
--cube.nodes;
cube = null;
parent = null;
}
/**
* Prune the lowest layer of the tree.
*/
void pruneLevel() {
if (nchild != 0) {
for (int id = 0; id < 8; id++) {
if (child[id] != null) {
child[id].pruneLevel();
}
}
}
if (level == cube.depth) {
pruneChild();
}
}
/**
* Remove any nodes that have fewer than threshold
* pixels. Also, as long as we"re walking the tree:
*
* - figure out the color with the fewest pixels
* - recalculate the total number of colors in the tree
*/
int reduce(int threshold, int next_threshold) {
if (nchild != 0) {
for (int id = 0; id < 8; id++) {
if (child[id] != null) {
next_threshold = child[id].reduce(threshold, next_threshold);
}
}
}
if (number_pixels <= threshold) {
pruneChild();
} else {
if (unique != 0) {
cube.colors++;
}
if (number_pixels < next_threshold) {
next_threshold = number_pixels;
}
}
return next_threshold;
}
/*
* colormap traverses the color cube tree and notes each
* colormap entry. A colormap entry is any node in the
* color cube tree where the number of unique colors is
* not zero.
*/
void colormap() {
if (nchild != 0) {
for (int id = 0; id < 8; id++) {
if (child[id] != null) {
child[id].colormap();
}
}
}
if (unique != 0) {
int r = ((total_red + (unique >> 1)) / unique);
int g = ((total_green + (unique >> 1)) / unique);
int b = ((total_blue + (unique >> 1)) / unique);
cube.colormap[cube.colors] = ((( 0xFF) << 24) |
((r & 0xFF) << 16) |
((g & 0xFF) << 8) |
((b & 0xFF) << 0));
color_number = cube.colors++;
}
}
/* ClosestColor traverses the color cube tree at a
* particular node and determines which colormap entry
* best represents the input color.
*/
void closestColor(int red, int green, int blue, Search search) {
if (nchild != 0) {
for (int id = 0; id < 8; id++) {
if (child[id] != null) {
child[id].closestColor(red, green, blue, search);
}
}
}
if (unique != 0) {
int color = cube.colormap[color_number];
int distance = distance(color, red, green, blue);
if (distance < search.distance) {
search.distance = distance;
search.color_number = color_number;
}
}
}
/**
* Figure out the distance between this node and som color.
*/
final static int distance(int color, int r, int g, int b) {
return (SQUARES[((color >> 16) & 0xFF) - r + MAX_RGB] +
SQUARES[((color >> 8) & 0xFF) - g + MAX_RGB] +
SQUARES[((color >> 0) & 0xFF) - b + MAX_RGB]);
}
public String toString() {
StringBuffer buf = new StringBuffer();
if (parent == this) {
buf.append("root");
} else {
buf.append("node");
}
buf.append(" ");
buf.append(level);
buf.append(" [");
buf.append(mid_red);
buf.append(",");
buf.append(mid_green);
buf.append(",");
buf.append(mid_blue);
buf.append("]");
return new String(buf);
}
}
}
}
</source>
Color class is used to work with colors in Java 2D
<source lang="java"> import java.awt.Color; import java.awt.Graphics; import java.awt.Graphics2D; import javax.swing.JFrame; import javax.swing.JPanel; public class Colors extends JPanel {
public void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g;
g2d.setColor(new Color(12, 16, 116));
g2d.fillRect(10, 15, 90, 60);
g2d.setColor(new Color(42, 19, 31));
g2d.fillRect(130, 15, 90, 60);
g2d.setColor(new Color(70, 7, 23));
g2d.fillRect(250, 15, 90, 60);
g2d.setColor(new Color(10, 10, 84));
g2d.fillRect(10, 105, 90, 60);
g2d.setColor(new Color(22, 21, 61));
g2d.fillRect(130, 105, 90, 60);
g2d.setColor(new Color(21, 98, 69));
g2d.fillRect(250, 105, 90, 60);
g2d.setColor(new Color(217, 146, 54));
g2d.fillRect(10, 195, 90, 60);
g2d.setColor(new Color(63, 121, 186));
g2d.fillRect(130, 195, 90, 60);
g2d.setColor(new Color(131, 121, 11));
g2d.fillRect(250, 195, 90, 60);
}
public static void main(String[] args) {
JFrame frame = new JFrame("Colors");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new Colors());
frame.setSize(360, 300);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
}
</source>
Color Difference
<source lang="java">
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;
import javax.swing.Timer;
/*
* ColorDifference.java * * Created on May 3, 2007, 7:12 AM * * Copyright (c) 2007, Sun Microsystems, Inc * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above * copyright notice, this list of conditions and the following * disclaimer in the documentation and/or other materials provided * with the distribution. * * Neither the name of the TimingFramework project nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
/**
* * @author Chet */
public class ColorDifference extends JComponent implements ActionListener {
private Color largeRectColors[] = { Color.BLACK, new Color(3, 3, 3) };
private Color smallRectColors[] = { Color.BLACK, Color.WHITE };
private int colorIndex = 0;
private static int FADE_X = 0;
private static int BLANK_X = 0;
/** Creates a new instance of ColorDifference */
public ColorDifference() {
Timer timer = new Timer(1000, this);
timer.start();
setPreferredSize(new Dimension(300, 200));
}
/**
* Displays our component with the animating colors of the areas on the left
* and right, separated by an area of white in the middle
*/
@Override
protected void paintComponent(Graphics g) {
int fadeX = 0;
int blankX = getWidth() / 3;
int bigRectW = getWidth() / 3;
// Fill left-side rectangle with current animating color
g.setColor(largeRectColors[colorIndex]);
g.fillRect(0, 0, bigRectW, getHeight());
// Fill middle area with white
g.setColor(Color.WHITE);
g.fillRect(bigRectW, 0, bigRectW, getHeight());
// Fill right-side rectangle with black, with a white square
// in the middle
int bigRectX = 2 * bigRectW;
int smallRectW = 4;
int smallRectH = 4;
int smallRectX = bigRectX + (bigRectW / 2) - (smallRectW / 2);
int smallRectY = (getHeight() / 2) - (smallRectH / 2);
g.setColor(Color.BLACK);
g.fillRect(2 * getWidth() / 3, 0, getWidth() / 3, getHeight());
g.setColor(smallRectColors[colorIndex]);
g.fillRect(smallRectX, smallRectY, smallRectW, smallRectH);
}
/**
* Handles Timer events by toggling the colorIndex used to fill the left-side
* rectangle
*/
public void actionPerformed(ActionEvent ae) {
colorIndex++;
colorIndex = colorIndex % 2;
repaint();
}
private static void createAndShowGUI() {
JFrame f = new JFrame("Color Difference");
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setSize(300, 200);
ColorDifference component = new ColorDifference();
f.add(component);
f.pack();
f.setVisible(true);
}
/**
* @param args
* the command line arguments
*/
public static void main(String[] args) {
Runnable doCreateAndShowGUI = new Runnable() {
public void run() {
createAndShowGUI();
}
};
SwingUtilities.invokeLater(doCreateAndShowGUI);
}
}
</source>
Color Factory
<source lang="java"> /*
GNU LESSER GENERAL PUBLIC LICENSE Copyright (C) 2006 The Lobo Project This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA Contact info: lobochief@users.sourceforge.net
- /
/*
* Created on Apr 17, 2005 */
import java.util.*; import java.util.logging.*; import java.awt.*; /**
* @author J. H. S. */
public class ColorFactory {
private static final Logger logger = Logger.getLogger(ColorFactory.class.getName());
public static final Color TRANSPARENT = new Color(0, 0, 0, 0);
private static ColorFactory instance;
private final Map colorMap = new HashMap(256);
private ColorFactory() {
Map colorMap = this.colorMap;
synchronized(this) {
colorMap.put("transparent", TRANSPARENT);
//http://www.w3schools.ru/css/css_colornames.asp
colorMap.put("aliceblue", new Color(0xf0f8ff));
colorMap.put("antiquewhite", new Color(0xfaebd7));
colorMap.put("aqua", new Color(0x00ffff));
colorMap.put("aquamarine", new Color(0x7fffd4));
colorMap.put("azure", new Color(0xf0ffff));
colorMap.put("beige", new Color(0xf5f5dc));
colorMap.put("bisque", new Color(0xffe4c4));
colorMap.put("black", new Color(0x000000));
colorMap.put("blanchedalmond", new Color(0xffebcd));
colorMap.put("blue", new Color(0x0000ff));
colorMap.put("blueviolet", new Color(0x8a2be2));
colorMap.put("brown", new Color(0xa52a2a));
colorMap.put("burlywood", new Color(0xdeb887));
colorMap.put("cadetblue", new Color(0x5f9ea0));
colorMap.put("chartreuse", new Color(0x7fff00));
colorMap.put("chocolate", new Color(0xd2691e));
colorMap.put("coral", new Color(0xff7f50));
colorMap.put("cornflowerblue", new Color(0x6495ed));
colorMap.put("cornsilk", new Color(0xfff8dc));
colorMap.put("crimson", new Color(0xdc143c));
colorMap.put("cyan", new Color(0x00ffff));
colorMap.put("darkblue", new Color(0x00008b));
colorMap.put("darkcyan", new Color(0x008b8b));
colorMap.put("darkgoldenrod", new Color(0xb8860b));
colorMap.put("darkgray", new Color(0xa9a9a9));
colorMap.put("darkgrey", new Color(0xa9a9a9));
colorMap.put("darkgreen", new Color(0x006400));
colorMap.put("darkkhaki", new Color(0xbdb76b));
colorMap.put("darkmagenta", new Color(0x8b008b));
colorMap.put("darkolivegreen", new Color(0x556b2f));
colorMap.put("darkorange", new Color(0xff8c00));
colorMap.put("darkorchid", new Color(0x9932cc));
colorMap.put("darkred", new Color(0x8b0000));
colorMap.put("darksalmon", new Color(0xe9967a));
colorMap.put("darkseagreen", new Color(0x8fbc8f));
colorMap.put("darkslateblue", new Color(0x483d8b));
colorMap.put("darkslategray", new Color(0x2f4f4f));
colorMap.put("darkslategrey", new Color(0x2f4f4f));
colorMap.put("darkturquoise", new Color(0x00ced1));
colorMap.put("darkviolet", new Color(0x9400d3));
colorMap.put("deeppink", new Color(0xff1493));
colorMap.put("deepskyblue", new Color(0x00bfff));
colorMap.put("dimgray", new Color(0x696969));
colorMap.put("dimgrey", new Color(0x696969));
colorMap.put("dodgerblue", new Color(0x1e90ff));
colorMap.put("firebrick", new Color(0xb22222));
colorMap.put("floralwhite", new Color(0xfffaf0));
colorMap.put("forestgreen", new Color(0x228b22));
colorMap.put("fuchsia", new Color(0xff00ff));
colorMap.put("gainsboro", new Color(0xdcdcdc));
colorMap.put("ghostwhite", new Color(0xf8f8ff));
colorMap.put("gold", new Color(0xffd700));
colorMap.put("goldenrod", new Color(0xdaa520));
colorMap.put("gray", new Color(0x808080));
colorMap.put("grey", new Color(0x808080));
colorMap.put("green", new Color(0x008000));
colorMap.put("greenyellow", new Color(0xadff2f));
colorMap.put("honeydew", new Color(0xf0fff0));
colorMap.put("hotpink", new Color(0xff69b4));
colorMap.put("indianred", new Color(0xcd5c5c));
colorMap.put("indigo", new Color(0x4b0082));
colorMap.put("ivory", new Color(0xfffff0));
colorMap.put("khaki", new Color(0xf0e68c));
colorMap.put("lavender", new Color(0xe6e6fa));
colorMap.put("lavenderblush", new Color(0xfff0f5));
colorMap.put("lawngreen", new Color(0x7cfc00));
colorMap.put("lemonchiffon", new Color(0xfffacd));
colorMap.put("lightblue", new Color(0xadd8e6));
colorMap.put("lightcoral", new Color(0xf08080));
colorMap.put("lightcyan", new Color(0xe0ffff));
colorMap.put("lightgoldenrodyellow", new Color(0xfafad2));
colorMap.put("lightgray", new Color(0xd3d3d3));
colorMap.put("lightgrey", new Color(0xd3d3d3));
colorMap.put("lightgreen", new Color(0x90ee90));
colorMap.put("lightpink", new Color(0xffb6c1));
colorMap.put("lightsalmon", new Color(0xffa07a));
colorMap.put("lightseagreen", new Color(0x20b2aa));
colorMap.put("lightskyblue", new Color(0x87cefa));
colorMap.put("lightslategray", new Color(0x778899));
colorMap.put("lightslategrey", new Color(0x778899));
colorMap.put("lightsteelblue", new Color(0xb0c4de));
colorMap.put("lightyellow", new Color(0xffffe0));
colorMap.put("lime", new Color(0x00ff00));
colorMap.put("limegreen", new Color(0x32cd32));
colorMap.put("linen", new Color(0xfaf0e6));
colorMap.put("magenta", new Color(0xff00ff));
colorMap.put("maroon", new Color(0x800000));
colorMap.put("mediumaquamarine", new Color(0x66cdaa));
colorMap.put("mediumblue", new Color(0x0000cd));
colorMap.put("mediumorchid", new Color(0xba55d3));
colorMap.put("mediumpurple", new Color(0x9370d8));
colorMap.put("mediumseagreen", new Color(0x3cb371));
colorMap.put("mediumslateblue", new Color(0x7b68ee));
colorMap.put("mediumspringgreen", new Color(0x00fa9a));
colorMap.put("mediumturquoise", new Color(0x48d1cc));
colorMap.put("mediumvioletred", new Color(0xc71585));
colorMap.put("midnightblue", new Color(0x191970));
colorMap.put("mintcream", new Color(0xf5fffa));
colorMap.put("mistyrose", new Color(0xffe4e1));
colorMap.put("moccasin", new Color(0xffe4b5));
colorMap.put("navajowhite", new Color(0xffdead));
colorMap.put("navy", new Color(0x000080));
colorMap.put("oldlace", new Color(0xfdf5e6));
colorMap.put("olive", new Color(0x808000));
colorMap.put("olivedrab", new Color(0x6b8e23));
colorMap.put("orange", new Color(0xffa500));
colorMap.put("orangered", new Color(0xff4500));
colorMap.put("orchid", new Color(0xda70d6));
colorMap.put("palegoldenrod", new Color(0xeee8aa));
colorMap.put("palegreen", new Color(0x98fb98));
colorMap.put("paleturquoise", new Color(0xafeeee));
colorMap.put("palevioletred", new Color(0xd87093));
colorMap.put("papayawhip", new Color(0xffefd5));
colorMap.put("peachpuff", new Color(0xffdab9));
colorMap.put("peru", new Color(0xcd853f));
colorMap.put("pink", new Color(0xffc0cb));
colorMap.put("plum", new Color(0xdda0dd));
colorMap.put("powderblue", new Color(0xb0e0e6));
colorMap.put("purple", new Color(0x800080));
colorMap.put("red", new Color(0xff0000));
colorMap.put("rosybrown", new Color(0xbc8f8f));
colorMap.put("royalblue", new Color(0x4169e1));
colorMap.put("saddlebrown", new Color(0x8b4513));
colorMap.put("salmon", new Color(0xfa8072));
colorMap.put("sandybrown", new Color(0xf4a460));
colorMap.put("seagreen", new Color(0x2e8b57));
colorMap.put("seashell", new Color(0xfff5ee));
colorMap.put("sienna", new Color(0xa0522d));
colorMap.put("silver", new Color(0xc0c0c0));
colorMap.put("skyblue", new Color(0x87ceeb));
colorMap.put("slateblue", new Color(0x6a5acd));
colorMap.put("slategray", new Color(0x708090));
colorMap.put("slategrey", new Color(0x708090));
colorMap.put("snow", new Color(0xfffafa));
colorMap.put("springgreen", new Color(0x00ff7f));
colorMap.put("steelblue", new Color(0x4682b4));
colorMap.put("tan", new Color(0xd2b48c));
colorMap.put("teal", new Color(0x008080));
colorMap.put("thistle", new Color(0xd8bfd8));
colorMap.put("tomato", new Color(0xff6347));
colorMap.put("turquoise", new Color(0x40e0d0));
colorMap.put("violet", new Color(0xee82ee));
colorMap.put("wheat", new Color(0xf5deb3));
colorMap.put("white", new Color(0xffffff));
colorMap.put("whitesmoke", new Color(0xf5f5f5));
colorMap.put("yellow", new Color(0xffff00));
colorMap.put("yellowgreen", new Color(0x9acd32));
}
}
public static final ColorFactory getInstance() {
if(instance == null) {
synchronized(ColorFactory.class) {
if(instance == null) {
instance = new ColorFactory();
}
}
}
return instance;
}
private static final String RGB_START = "rgb(";
public boolean isColor(String colorSpec) {
if(colorSpec.startsWith("#")) {
return true;
}
String normalSpec = colorSpec.toLowerCase();
if(normalSpec.startsWith(RGB_START)) {
return true;
}
synchronized(this) {
return colorMap.containsKey(normalSpec);
}
}
public Color getColor(String colorSpec) {
String normalSpec = colorSpec.toLowerCase();
synchronized(this) {
Color color = (Color) colorMap.get(normalSpec);
if(color == null) {
if(normalSpec.startsWith(RGB_START)) {
// CssParser produces this format.
int endIdx = normalSpec.lastIndexOf(")");
String commaValues = endIdx == -1 ? normalSpec.substring(RGB_START.length()) : normalSpec.substring(RGB_START.length(), endIdx);
StringTokenizer tok = new StringTokenizer(commaValues, ",");
int r = 0, g = 0, b = 0;
if(tok.hasMoreTokens()) {
String rstr = tok.nextToken().trim();
try {
r = Integer.parseInt(rstr);
} catch(NumberFormatException nfe) {
// ignore
}
if(tok.hasMoreTokens()) {
String gstr = tok.nextToken().trim();
try {
g = Integer.parseInt(gstr);
} catch(NumberFormatException nfe) {
// ignore
}
if(tok.hasMoreTokens()) {
String bstr = tok.nextToken().trim();
try {
b = Integer.parseInt(bstr);
} catch(NumberFormatException nfe) {
// ignore
}
}
}
}
color = new Color(r, g, b);
}
else if(normalSpec.startsWith("#")) {
//TODO: OPTIMIZE: It would be more efficient to
//create new Color(hex), but CssParser doesn"t
//give us values formatted with "#" either way.
int len = normalSpec.length();
int[] rgba = new int[4];
rgba[3] = 255;
for(int i = 0; i < rgba.length; i++)
{
int idx = 2 * i + 1;
if(idx < len)
{
String hexText = normalSpec.substring(idx, idx + Math.min(2, len - idx));
try {
rgba[i] = Integer.parseInt(hexText, 16);
} catch(NumberFormatException nfe) {
// Ignore
}
}
}
color = new Color(rgba[0], rgba[1], rgba[2], rgba[3]);
}
else {
if(logger.isLoggable(Level.INFO)) {
logger.warning("getColor(): Color spec [" + normalSpec + "] unknown.");
}
return Color.RED;
}
colorMap.put(normalSpec, color);
}
return color;
}
}
}
</source>
Color fading animation
<source lang="java"> import java.awt.AlphaComposite; import java.awt.Color; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.RenderingHints; import java.awt.geom.Rectangle2D; import javax.swing.JFrame; import javax.swing.JPanel; public class ColorFadingAnimation extends JPanel {
private Rectangle2D rect = new Rectangle2D.Float(20f, 20f, 80f, 50f);
private float alpha_rectangle = 1f;
public ColorFadingAnimation() {
new RectRunnable();
}
public void paint(Graphics g) {
super.paint(g);
Graphics2D g2d = (Graphics2D) g;
g2d.setColor(new Color(50, 50, 50));
RenderingHints rh = new RenderingHints(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
rh.put(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
g2d.setRenderingHints(rh);
g2d.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, alpha_rectangle));
g2d.fill(rect);
}
public static void main(String[] args) {
JFrame frame = new JFrame("Color fading aniamtion");
frame.add(new ColorFadingAnimation());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(250, 150);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
class RectRunnable implements Runnable {
private Thread runner;
public RectRunnable() {
runner = new Thread(this);
runner.start();
}
public void run() {
while (alpha_rectangle >= 0) {
repaint();
alpha_rectangle += -0.01f;
if (alpha_rectangle < 0) {
alpha_rectangle = 0;
}
try {
Thread.sleep(50);
} catch (Exception e) {
}
}
}
}
}
</source>
Color Util
<source lang="java"> /*
* Copyright (C) 2004 NNL Technology AB * Visit www.infonode.net for information about InfoNode(R) * products and how to contact NNL Technology AB. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, * MA 02111-1307, USA. */
// $Id: ColorUtil.java,v 1.10 2005/02/16 11:28:14 jesper Exp $
import java.awt.*; public final class ColorUtil {
private ColorUtil() {
}
public static Color getOpposite(Color c) {
return isDark(c) ? Color.WHITE : Color.BLACK;
}
public static Color shade(Color c, double amount) {
return blend(c, getOpposite(c), amount);
}
public static final Color mult(Color c, double amount) {
return c == null ? null : new Color(Math.min(255, (int) (c.getRed() * amount)),
Math.min(255, (int) (c.getGreen() * amount)),
Math.min(255, (int) (c.getBlue() * amount)),
c.getAlpha());
}
public static Color setAlpha(Color c, int alpha) {
return c == null ? null : new Color(c.getRed(), c.getGreen(), c.getBlue(), alpha);
}
public static final Color add(Color c1, Color c2) {
return c1 == null ? c2 :
c2 == null ? c1 :
new Color(Math.min(255, c1.getRed() + c2.getRed()),
Math.min(255, c1.getGreen() + c2.getGreen()),
Math.min(255, c1.getBlue() + c2.getBlue()),
c1.getAlpha());
}
public static Color blend(Color c1, Color c2, double v) {
double v2 = 1 - v;
return c1 == null ? (c2 == null ? null : c2) :
c2 == null ? c1 :
new Color(Math.min(255, (int) (c1.getRed() * v2 + c2.getRed() * v)),
Math.min(255, (int) (c1.getGreen() * v2 + c2.getGreen() * v)),
Math.min(255, (int) (c1.getBlue() * v2 + c2.getBlue() * v)),
Math.min(255, (int) (c1.getAlpha() * v2 + c2.getAlpha() * v)));
}
public static boolean isDark(Color c) {
return c.getRed() + c.getGreen() + c.getBlue() < 3 * 180;
}
public static Color highlight(Color c) {
return mult(c, isDark(c) ? 1.5F : 0.67F);
}
public static Color copy(Color c) {
return c == null ? null : new Color(c.getRed(), c.getGreen(), c.getBlue(), c.getAlpha());
}
}
</source>
Color Utilities: common color operations
<source lang="java">
/* * $Id: ColorUtilities.java,v 1.1 2006/12/15 13:53:13 gfx Exp $ * * Dual-licensed under LGPL (Sun and Romain Guy) and BSD (Romain Guy). * * Copyright 2006 Sun Microsystems, Inc., 4150 Network Circle, * Santa Clara, California 95054, U.S.A. All rights reserved. * * Copyright (c) 2006 Romain Guy <romain.guy@mac.ru> * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS"" AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
/***
ColorUtilities contains a set of tools to perform
* common color operations easily.
*
* @author Romain Guy <romain.guy@mac.ru>
*/
class ColorUtilities {
private ColorUtilities() {
}
/**
* Returns the HSL (Hue/Saturation/Luminance) equivalent of a given * RGB color. All three HSL components are between 0.0 and 1.0.
*
* @param color the RGB color to convert
* @return a new array of 3 floats corresponding to the HSL components
*/
public static float[] RGBtoHSL(Color color) {
return RGBtoHSL(color.getRed(), color.getGreen(), color.getBlue(), null);
}
/**
* Returns the HSL (Hue/Saturation/Luminance) equivalent of a given * RGB color. All three HSL components are between 0.0 and 1.0.
*
* @param color the RGB color to convert
* @param hsl a pre-allocated array of floats; can be null
* @return hsl if non-null, a new array of 3 floats otherwise
* @throws IllegalArgumentException if hsl has a length lower
* than 3
*/
public static float[] RGBtoHSL(Color color, float[] hsl) {
return RGBtoHSL(color.getRed(), color.getGreen(), color.getBlue(), hsl);
}
/**
* Returns the HSL (Hue/Saturation/Luminance) equivalent of a given * RGB color. All three HSL components are between 0.0 and 1.0.
*
* @param r the red component, between 0 and 255
* @param g the green component, between 0 and 255
* @param b the blue component, between 0 and 255
* @return a new array of 3 floats corresponding to the HSL components
*/
public static float[] RGBtoHSL(int r, int g, int b) {
return RGBtoHSL(r, g, b, null);
}
/**
* Returns the HSL (Hue/Saturation/Luminance) equivalent of a given * RGB color. All three HSL components are floats between 0.0 and 1.0.
*
* @param r the red component, between 0 and 255
* @param g the green component, between 0 and 255
* @param b the blue component, between 0 and 255
* @param hsl a pre-allocated array of floats; can be null
* @return hsl if non-null, a new array of 3 floats otherwise
* @throws IllegalArgumentException if hsl has a length lower
* than 3
*/
public static float[] RGBtoHSL(int r, int g, int b, float[] hsl) {
if (hsl == null) {
hsl = new float[3];
} else if (hsl.length < 3) {
throw new IllegalArgumentException("hsl array must have a length of" +
" at least 3");
}
if (r < 0) r = 0;
else if (r > 255) r = 255;
if (g < 0) g = 0;
else if (g > 255) g = 255;
if (b < 0) b = 0;
else if (b > 255) b = 255;
float var_R = (r / 255f);
float var_G = (g / 255f);
float var_B = (b / 255f);
float var_Min;
float var_Max;
float del_Max;
if (var_R > var_G) {
var_Min = var_G;
var_Max = var_R;
} else {
var_Min = var_R;
var_Max = var_G;
}
if (var_B > var_Max) {
var_Max = var_B;
}
if (var_B < var_Min) {
var_Min = var_B;
}
del_Max = var_Max - var_Min;
float H, S, L;
L = (var_Max + var_Min) / 2f;
if (del_Max - 0.01f <= 0.0f) {
H = 0;
S = 0;
} else {
if (L < 0.5f) {
S = del_Max / (var_Max + var_Min);
} else {
S = del_Max / (2 - var_Max - var_Min);
}
float del_R = (((var_Max - var_R) / 6f) + (del_Max / 2f)) / del_Max;
float del_G = (((var_Max - var_G) / 6f) + (del_Max / 2f)) / del_Max;
float del_B = (((var_Max - var_B) / 6f) + (del_Max / 2f)) / del_Max;
if (var_R == var_Max) {
H = del_B - del_G;
} else if (var_G == var_Max) {
H = (1 / 3f) + del_R - del_B;
} else {
H = (2 / 3f) + del_G - del_R;
}
if (H < 0) {
H += 1;
}
if (H > 1) {
H -= 1;
}
}
hsl[0] = H;
hsl[1] = S;
hsl[2] = L;
return hsl;
}
/**
* Returns the RGB equivalent of a given HSL (Hue/Saturation/Luminance) * color.
*
* @param h the hue component, between 0.0 and 1.0
* @param s the saturation component, between 0.0 and 1.0
* @param l the luminance component, between 0.0 and 1.0
* @return a new Color object equivalent to the HSL components
*/
public static Color HSLtoRGB(float h, float s, float l) {
int[] rgb = HSLtoRGB(h, s, l, null);
return new Color(rgb[0], rgb[1], rgb[2]);
}
/**
* Returns the RGB equivalent of a given HSL (Hue/Saturation/Luminance) * color. All three RGB components are integers between 0 and 255.
*
* @param h the hue component, between 0.0 and 1.0
* @param s the saturation component, between 0.0 and 1.0
* @param l the luminance component, between 0.0 and 1.0
* @param rgb a pre-allocated array of ints; can be null
* @return rgb if non-null, a new array of 3 ints otherwise
* @throws IllegalArgumentException if rgb has a length lower
* than 3
*/
public static int[] HSLtoRGB(float h, float s, float l, int[] rgb) {
if (rgb == null) {
rgb = new int[3];
} else if (rgb.length < 3) {
throw new IllegalArgumentException("rgb array must have a length of" +
" at least 3");
}
if (h < 0) h = 0.0f;
else if (h > 1.0f) h = 1.0f;
if (s < 0) s = 0.0f;
else if (s > 1.0f) s = 1.0f;
if (l < 0) l = 0.0f;
else if (l > 1.0f) l = 1.0f;
int R, G, B;
if (s - 0.01f <= 0.0f) {
R = (int) (l * 255.0f);
G = (int) (l * 255.0f);
B = (int) (l * 255.0f);
} else {
float var_1, var_2;
if (l < 0.5f) {
var_2 = l * (1 + s);
} else {
var_2 = (l + s) - (s * l);
}
var_1 = 2 * l - var_2;
R = (int) (255.0f * hue2RGB(var_1, var_2, h + (1.0f / 3.0f)));
G = (int) (255.0f * hue2RGB(var_1, var_2, h));
B = (int) (255.0f * hue2RGB(var_1, var_2, h - (1.0f / 3.0f)));
}
rgb[0] = R;
rgb[1] = G;
rgb[2] = B;
return rgb;
}
private static float hue2RGB(float v1, float v2, float vH) {
if (vH < 0.0f) {
vH += 1.0f;
}
if (vH > 1.0f) {
vH -= 1.0f;
}
if ((6.0f * vH) < 1.0f) {
return (v1 + (v2 - v1) * 6.0f * vH);
}
if ((2.0f * vH) < 1.0f) {
return (v2);
}
if ((3.0f * vH) < 2.0f) {
return (v1 + (v2 - v1) * ((2.0f / 3.0f) - vH) * 6.0f);
}
return (v1);
}
}
</source>
Common color utilities
<source lang="java"> /*
* This code is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * This code is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this program; if not, write to the Free * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, * MA 02111-1307, USA. */
//package no.geosoft.cc.color.ui;
import java.awt.Color;
/**
* Common color utilities. * * @author */
public class ColorUtil {
/**
* Blend two colors.
*
* @param color1 First color to blend.
* @param color2 Second color to blend.
* @param ratio Blend ratio. 0.5 will give even blend, 1.0 will return
* color1, 0.0 will return color2 and so on.
* @return Blended color.
*/
public static Color blend (Color color1, Color color2, double ratio)
{
float r = (float) ratio;
float ir = (float) 1.0 - r;
float rgb1[] = new float[3];
float rgb2[] = new float[3];
color1.getColorComponents (rgb1);
color2.getColorComponents (rgb2);
Color color = new Color (rgb1[0] * r + rgb2[0] * ir,
rgb1[1] * r + rgb2[1] * ir,
rgb1[2] * r + rgb2[2] * ir);
return color;
}
/**
* Make an even blend between two colors.
*
* @param c1 First color to blend.
* @param c2 Second color to blend.
* @return Blended color.
*/
public static Color blend (Color color1, Color color2)
{
return ColorUtil.blend (color1, color2, 0.5);
}
/**
* Make a color darker.
*
* @param color Color to make darker.
* @param fraction Darkness fraction.
* @return Darker color.
*/
public static Color darker (Color color, double fraction)
{
int red = (int) Math.round (color.getRed() * (1.0 - fraction));
int green = (int) Math.round (color.getGreen() * (1.0 - fraction));
int blue = (int) Math.round (color.getBlue() * (1.0 - fraction));
if (red < 0) red = 0; else if (red > 255) red = 255;
if (green < 0) green = 0; else if (green > 255) green = 255;
if (blue < 0) blue = 0; else if (blue > 255) blue = 255;
int alpha = color.getAlpha();
return new Color (red, green, blue, alpha);
}
/**
* Make a color lighter.
*
* @param color Color to make lighter.
* @param fraction Darkness fraction.
* @return Lighter color.
*/
public static Color lighter (Color color, double fraction)
{
int red = (int) Math.round (color.getRed() * (1.0 + fraction));
int green = (int) Math.round (color.getGreen() * (1.0 + fraction));
int blue = (int) Math.round (color.getBlue() * (1.0 + fraction));
if (red < 0) red = 0; else if (red > 255) red = 255;
if (green < 0) green = 0; else if (green > 255) green = 255;
if (blue < 0) blue = 0; else if (blue > 255) blue = 255;
int alpha = color.getAlpha();
return new Color (red, green, blue, alpha);
}
/**
* Return the hex name of a specified color.
*
* @param color Color to get hex name of.
* @return Hex name of color: "rrggbb".
*/
public static String getHexName (Color color)
{
int r = color.getRed();
int g = color.getGreen();
int b = color.getBlue();
String rHex = Integer.toString (r, 16);
String gHex = Integer.toString (g, 16);
String bHex = Integer.toString (b, 16);
return (rHex.length() == 2 ? "" + rHex : "0" + rHex) +
(gHex.length() == 2 ? "" + gHex : "0" + gHex) +
(bHex.length() == 2 ? "" + bHex : "0" + bHex);
}
/**
* Return the "distance" between two colors. The rgb entries are taken
* to be coordinates in a 3D space [0.0-1.0], and this method returnes
* the distance between the coordinates for the first and second color.
*
* @param r1, g1, b1 First color.
* @param r2, g2, b2 Second color.
* @return Distance bwetween colors.
*/
public static double colorDistance (double r1, double g1, double b1,
double r2, double g2, double b2)
{
double a = r2 - r1;
double b = g2 - g1;
double c = b2 - b1;
return Math.sqrt (a*a + b*b + c*c);
}
/**
* Return the "distance" between two colors.
*
* @param color1 First color [r,g,b].
* @param color2 Second color [r,g,b].
* @return Distance bwetween colors.
*/
public static double colorDistance (double[] color1, double[] color2)
{
return ColorUtil.colorDistance (color1[0], color1[1], color1[2],
color2[0], color2[1], color2[2]);
}
/**
* Return the "distance" between two colors.
*
* @param color1 First color.
* @param color2 Second color.
* @return Distance between colors.
*/
public static double colorDistance (Color color1, Color color2)
{
float rgb1[] = new float[3];
float rgb2[] = new float[3];
color1.getColorComponents (rgb1);
color2.getColorComponents (rgb2);
return ColorUtil.colorDistance (rgb1[0], rgb1[1], rgb1[2],
rgb2[0], rgb2[1], rgb2[2]);
}
/**
* Check if a color is more dark than light. Useful if an entity of
* this color is to be labeled: Use white label on a "dark" color and
* black label on a "light" color.
*
* @param r,g,b Color to check.
* @return True if this is a "dark" color, false otherwise.
*/
public static boolean isDark (double r, double g, double b)
{
// Measure distance to white and black respectively
double dWhite = ColorUtil.colorDistance (r, g, b, 1.0, 1.0, 1.0);
double dBlack = ColorUtil.colorDistance (r, g, b, 0.0, 0.0, 0.0);
return dBlack < dWhite;
}
/**
* Check if a color is more dark than light. Useful if an entity of
* this color is to be labeled: Use white label on a "dark" color and
* black label on a "light" color.
*
* @param color Color to check.
* @return True if this is a "dark" color, false otherwise.
*/
public static boolean isDark (Color color)
{
float r = color.getRed() / 255.0f;
float g = color.getGreen() / 255.0f;
float b = color.getBlue() / 255.0f;
return isDark (r, g, b);
}
}
</source>
Converts a given string into a color.
<source lang="java"> import java.awt.Color; import java.lang.reflect.Field; /*
* JCommon : a free general purpose class library for the Java(tm) platform * * * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors. * * Project Info: http://www.jfree.org/jcommon/index.html * * This library is free software; you can redistribute it and/or modify it * under the terms of the GNU Lesser General Public License as published by * the Free Software Foundation; either version 2.1 of the License, or * (at your option) any later version. * * This library is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public * License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, * USA. * * [Java is a trademark or registered trademark of Sun Microsystems, Inc. * in the United States and other countries.] * * ------------------- * PaintUtilities.java * ------------------- * (C) Copyright 2003-2005, by Object Refinery Limited. * * Original Author: David Gilbert (for Object Refinery Limited); * Contributor(s): -; * * $Id: PaintUtilities.java,v 1.10 2007/11/02 17:50:37 taqua Exp $ * * Changes * ------- * 13-Nov-2003 : Version 1 (DG); * 04-Oct-2004 : Renamed PaintUtils --> PaintUtilities (DG); * 23-Feb-2005 : Rewrote equal() method with less indenting required (DG); * */
public class Main {
/**
* Converts a given string into a color.
*
* @param value
* the string, either a name or a hex-string.
* @return the color.
*/
public static Color stringToColor(final String value) {
if (value == null) {
return Color.black;
}
try {
// get color by hex or octal value
return Color.decode(value);
} catch (NumberFormatException nfe) {
// if we can"t decode lets try to get it by name
try {
// try to get a color by name using reflection
final Field f = Color.class.getField(value);
return (Color) f.get(null);
} catch (Exception ce) {
// if we can"t get any color return black
return Color.black;
}
}
}
}
</source>
Converts the String representation of a color to an actual Color object.
<source lang="java"> import java.awt.Color; /*
* Copyright 2007 Google Inc. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */
/**
* Some string utilities for joining list of strings. * * @author ycoppel@google.ru (Yohann Coppel) * */
public class Utils {
/** * Converts theStringrepresentation of a color to an actual *Colorobject. * * @param value String representation of the color in "r,g,b" format (e.g. * "100,255,0") * @returnColorobject that matches the red-green-blue values * provided by the parameter. Returnsnullfor empty string. */ public static Color stringToColor(String value) { try { if (!value.equals("")) { String[] s = value.split(","); if (s.length == 3) { int red = Integer.parseInt(s[0]); int green = Integer.parseInt(s[1]); int blue = Integer.parseInt(s[2]); return new Color(red, green, blue); } } } catch (NumberFormatException ex) { // ignore it, don"t change anything. return null; } catch (IllegalArgumentException ex) { // if a user entered 548 as the red value.... // ignore it, don"t change anything. return null; } return null; }
}
</source>
Derives a color by adding the specified offsets to the base color"s hue, saturation, and brightness values
<source lang="java"> /*
* Copyright 2007-2008 Sun Microsystems, Inc. All Rights Reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * - Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * - Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * - Neither the name of Sun Microsystems nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
import java.awt.Color; /**
- @author aim
- /
public class Utils {
/**
* Derives a color by adding the specified offsets to the base color"s
* hue, saturation, and brightness values. The resulting hue, saturation,
* and brightness values will be contrained to be between 0 and 1.
* @param base the color to which the HSV offsets will be added
* @param dH the offset for hue
* @param dS the offset for saturation
* @param dB the offset for brightness
* @return Color with modified HSV values
*/
public static Color deriveColorHSB(Color base, float dH, float dS, float dB) {
float hsb[] = Color.RGBtoHSB(
base.getRed(), base.getGreen(), base.getBlue(), null);
hsb[0] += dH;
hsb[1] += dS;
hsb[2] += dB;
return Color.getHSBColor(
hsb[0] < 0? 0 : (hsb[0] > 1? 1 : hsb[0]),
hsb[1] < 0? 0 : (hsb[1] > 1? 1 : hsb[1]),
hsb[2] < 0? 0 : (hsb[2] > 1? 1 : hsb[2]));
}
}
</source>
Drawing with Color
<source lang="java"> import java.awt.Color; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.Rectangle; import javax.swing.JComponent; import javax.swing.JFrame; public class BasicDraw {
public static void main(String[] args) {
new BasicDraw();
}
BasicDraw() {
JFrame frame = new JFrame();
frame.add(new MyComponent());
frame.setSize(300, 300);
frame.setVisible(true);
}
} class MyComponent extends JComponent {
public void paint(Graphics g) {
Graphics2D g2d = (Graphics2D) g;
g2d.setColor(Color.red);
g2d.fill(new Rectangle(20,20,200,200));
int red = 230;
int green = 45;
int blue = 67;
g2d.setColor(new Color(red, green, blue));
g2d.fill(new Rectangle(40,40,200,200));
}
}
</source>
If the color is equal to one of the defined constant colors, that name is returned instead.
<source lang="java"> import java.awt.Color; import java.lang.reflect.Field; import java.lang.reflect.Modifier; /*
* JCommon : a free general purpose class library for the Java(tm) platform * * * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors. * * Project Info: http://www.jfree.org/jcommon/index.html * * This library is free software; you can redistribute it and/or modify it * under the terms of the GNU Lesser General Public License as published by * the Free Software Foundation; either version 2.1 of the License, or * (at your option) any later version. * * This library is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public * License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, * USA. * * [Java is a trademark or registered trademark of Sun Microsystems, Inc. * in the United States and other countries.] * * ------------------- * PaintUtilities.java * ------------------- * (C) Copyright 2003-2005, by Object Refinery Limited. * * Original Author: David Gilbert (for Object Refinery Limited); * Contributor(s): -; * * $Id: PaintUtilities.java,v 1.10 2007/11/02 17:50:37 taqua Exp $ * * Changes * ------- * 13-Nov-2003 : Version 1 (DG); * 04-Oct-2004 : Renamed PaintUtils --> PaintUtilities (DG); * 23-Feb-2005 : Rewrote equal() method with less indenting required (DG); * */
public class Main {
/**
* Converts a color into a string. If the color is equal to one of the defined
* constant colors, that name is returned instead. Otherwise the color is
* returned as hex-string.
*
* @param c
* the color.
* @return the string for this color.
*/
public static String colorToString(final Color c) {
try {
final Field[] fields = Color.class.getFields();
for (int i = 0; i < fields.length; i++) {
final Field f = fields[i];
if (Modifier.isPublic(f.getModifiers()) && Modifier.isFinal(f.getModifiers())
&& Modifier.isStatic(f.getModifiers())) {
final String name = f.getName();
final Object oColor = f.get(null);
if (oColor instanceof Color) {
if (c.equals(oColor)) {
return name;
}
}
}
}
} catch (Exception e) {
//
}
// no defined constant color, so this must be a user defined color
final String color = Integer.toHexString(c.getRGB() & 0x00ffffff);
final StringBuffer retval = new StringBuffer(7);
retval.append("#");
final int fillUp = 6 - color.length();
for (int i = 0; i < fillUp; i++) {
retval.append("0");
}
retval.append(color);
return retval.toString();
}
}
</source>
Map colors into names and vice versa.
<source lang="java"> /**
* * LibSparkline : a free Java sparkline chart library * * * Project Info: http://reporting.pentaho.org/libsparkline/ * * (C) Copyright 2008, by Larry Ogrodnek, Pentaho Corporation and Contributors. * * This library is free software; you can redistribute it and/or modify it under the terms * of the Apache License 2.0. * * This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. * * You should have received a copy of the Apache License 2.0 along with this library; * if not, a online version is available at http://www.apache.org/licenses/ * * [Java is a trademark or registered trademark of Sun Microsystems, Inc. * in the United States and other countries.] * * ------------ * ColorUtilitiy.java * ------------ */
import java.awt.Color; import java.lang.reflect.Field; import java.lang.reflect.Modifier; import java.util.HashMap; /**
* A helper class to map colors into names and vice versa. * * @author Thomas Morgner */
public final class ColorUtilitiy {
private static final HashMap knownColorNamesByColor;
private static final HashMap knownColorsByName;
static {
knownColorNamesByColor = new HashMap();
knownColorsByName = new HashMap();
try {
final Field[] fields = Color.class.getFields();
for (int i = 0; i < fields.length; i++) {
final Field f = fields[i];
if (Modifier.isPublic(f.getModifiers()) && Modifier.isFinal(f.getModifiers())
&& Modifier.isStatic(f.getModifiers())) {
final String name = f.getName();
final Object oColor = f.get(null);
if (oColor instanceof Color) {
knownColorNamesByColor.put(oColor, name.toLowerCase());
knownColorsByName.put(name.toLowerCase(), oColor);
}
}
}
} catch (Exception e) {
// ignore ..
}
}
/**
* Utility class constructor prevents object creation.
*/
private ColorUtilitiy() {
}
/**
* Parse a String into a Color. <p/> This method will accept either a color
* name (a field name from {@link Color}, case insensitive e.g. "red"), or a
* HTML hex color string (e.g. "#ff0000" for Color.RED).
*
* @param value
* String to parse for color name or color number.
* @return Color for s.
*/
private static Color parseColor(final String value) {
if (value == null) {
return null;
}
final Object o = knownColorsByName.get(value.toLowerCase());
if (o != null) {
return (Color) o;
}
try {
// get color by hex or octal value
return Color.decode(value.trim());
} catch (NumberFormatException nfe) {
return null;
}
}
/**
* Parse a String into a Color, and returns the given default value if the
* color is not parsable. <p/> This method will accept either a color name (a
* field name from {@link Color}, case insensitive e.g. "red"), or a HTML hex
* color string (e.g. "#ff0000" for Color.RED).
*
* @param colorText
* String to parse for color name or color number.
* @param defValue
* the default value that should be returned if the string is not
* parseable or null.
* @return Color for the text.
*/
public static Color convertColor(final String colorText, final Color defValue) {
if (colorText == null || colorText.isEmpty()) {
return defValue;
}
final Color retval = parseColor(colorText);
if (retval == null) {
return defValue;
}
return retval;
}
}
</source>
Rainbow Color
<source lang="java"> import java.awt.Graphics; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; import java.awt.image.BufferedImage; import javax.swing.JComponent; import javax.swing.JFrame; public class ColorPan extends JComponent {
BufferedImage image;
public void initialize() {
int width = getSize().width;
int height = getSize().height;
int[] data = new int[width * height];
int index = 0;
for (int i = 0; i < height; i++) {
int red = (i * 255) / (height - 1);
for (int j = 0; j < width; j++) {
int green = (j * 255) / (width - 1);
int blue = 128;
data[index++] = (red << 16) | (green << 8) | blue;
}
}
image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
image.setRGB(0, 0, width, height, data, 0, width);
}
public void paint(Graphics g) {
if (image == null)
initialize();
g.drawImage(image, 0, 0, this);
}
public static void main(String[] args) {
JFrame f = new JFrame("ColorPan");
f.getContentPane().add(new ColorPan());
f.setSize(300, 300);
f.setLocation(100, 100);
f.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
f.setVisible(true);
}
}
</source>
Utility for checking colors given either hexa or natural language string descriptions.
<source lang="java"> import java.awt.*; import java.lang.reflect.Field; import java.lang.reflect.Modifier; import java.util.HashMap; import java.util.Map; /**
* Utility for checking colors given either hexa or "natural language" string descriptions.*
For all assertEquals/equals methods, the "expected" parameter can be either: *
-
*
- A
Colorobject specifying the exact color
* - A
Stringobject containing the hexadecimal description of the exact color
* - A
Stringobject containing the name of a color for an approximate comparison. * The authorized names are those of the predefined Color objects defined in the Java * */ public final class ColorUtils { private static final Map<String, Color> nameToColorMap = buildNameToColorMap(); static final String UNEXPECTED_COLOR_CLASS = "Expected color should be an instance of Color or String"; public static boolean equals(Object expectedColor, Color actual) { if (expectedColor instanceof Color) { return expectedColor.equals(actual); } else if (expectedColor instanceof String) { return equals((String)expectedColor, actual); } throw new IllegalArgumentException(UNEXPECTED_COLOR_CLASS); } public static boolean equals(String expectedColor, Color actual) { Color foundColor = nameToColorMap.get(expectedColor.toUpperCase()); if (foundColor != null) { return equals(foundColor, actual, true); } try { foundColor = getColor(expectedColor); return equals(foundColor, actual, false); } catch (NumberFormatException e) { throw new IllegalArgumentException(""" + expectedColor + "" does not seem to be a color"); } } public static Color getColor(String hexaString) { return new Color(Integer.parseInt(hexaString, 16)); } /** * Returns a normalized string description given a Color or another String description */ public static String getColorDescription(Object color) { if (color instanceof Color) { return getColorDescription((Color)color); } else if (color instanceof String) { return getColorDescription((String)color); } throw new IllegalArgumentException(UNEXPECTED_COLOR_CLASS); } /** * Returns a description string for a given Color object */ public static String getColorDescription(Color color) { return toHexString(color).toUpperCase(); } /** * Normalizes a given color description string */ public static String getColorDescription(String color) { return color.toUpperCase(); } private static boolean equals(Color expected, Color actual, boolean matchBySimilarity) { if (matchBySimilarity) { return computeHSBDistance(expected, actual) < 0.9; } else { return expected.equals(actual); } } private static Color getColor(Object input) { if (input instanceof Color) { return (Color)input; } else if (input instanceof String) { Color namedColor = nameToColorMap.get(((String)input).toUpperCase()); if (namedColor != null) { return namedColor; } return getColor((String)input); } throw new IllegalArgumentException(UNEXPECTED_COLOR_CLASS); } private static double computeHSBDistance(Color expected, Color actual) { float[] expectedHSB = toHSB(expected); float[] actualHSB = toHSB(actual); return Math.sqrt(Math.pow((expectedHSB[0] - actualHSB[0]) * 20, 2) + Math.pow(expectedHSB[1] - actualHSB[1], 2) + Math.pow((expectedHSB[2] - actualHSB[2]) * 2, 2)); } private static float[] toHSB(Color aColor) { return Color.RGBtoHSB(aColor.getRed(), aColor.getGreen(), aColor.getBlue(), null); } private static Map<String, Color> buildNameToColorMap() { Map<String, Color> colorMap = new HashMap<String, Color>(); for (Field field : Color.class.getDeclaredFields()) { if (isConstantColorField(field)) { try { Color color = (Color)field.get(null); colorMap.put(field.getName().toUpperCase(), color); } catch (IllegalAccessException e) { // Should not occur because the field is public and static } } } colorMap.put("DARKGREY", getColor("555555")); colorMap.put("DARKBLUE", getColor("000055")); colorMap.put("DARKRED", getColor("550000")); colorMap.put("DARKGREEN", getColor("005500")); colorMap.put("DARK_GREY", getColor("555555")); colorMap.put("DARK_BLUE", getColor("000055")); colorMap.put("DARK_RED", getColor("550000")); colorMap.put("DARK_GREEN", getColor("005500")); return colorMap; } private static boolean isConstantColorField(Field field) { return Modifier.isPublic(field.getModifiers()) && Modifier.isStatic(field.getModifiers()) && Color.class == field.getType(); } private static String toHexString(Color color) { return Integer.toHexString(color.getRGB()).substring(2); } } </source>XOR color
<source lang="java"> import java.awt.Color; import java.awt.Container; import java.awt.Graphics; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; import javax.swing.JFrame; import javax.swing.JPanel; public class XORPanel extends JPanel {
XORPanel() { setBackground(Color.black); } public void paintComponent(Graphics g) { super.paintComponent(g); g.setColor(Color.red); g.fillRect(10, 10, 80, 30); g.setColor(Color.green); g.fillRect(50, 20, 80, 30); g.setColor(Color.blue); g.fillRect(130, 40, 80, 30); g.setXORMode(Color.green); g.fillRect(90, 30, 80, 30); } public static void main(String[] args) { JFrame frame = new JFrame(); frame.setTitle("XOR"); frame.setSize(300, 200); frame.addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent e) { System.exit(0); } }); Container contentPane = frame.getContentPane(); contentPane.add(new XORPanel()); frame.show(); }}
</source>
