Java Tutorial/2D Graphics/Color — различия между версиями
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Текущая версия на 15:25, 31 мая 2010
Содержание
- 1 Color class is used to work with colors in Java 2D
- 2 Color Factory
- 3 Construct Color object
- 4 Constructs several colors and draws various objects using these colors:
- 5 Convert an integer to an HTML RGB value
- 6 Convert HSB to RGB value
- 7 Convert RGB to HSB
- 8 Converts a given string into a color.
- 9 Converts the String representation of a color to an actual Color object.
- 10 Derives a color by adding the specified offsets to the base color"s hue, saturation, and brightness values
- 11 Drawing with Color
- 12 Get HTML Color String from Java Color object
- 13 HTML color and Java Color
- 14 java.awt.Color
- 15 Java Predefined Colors
- 16 Map colors into names and vice versa.
- 17 Set XOR mode to color blue
- 18 To compare two Color objects you can use the equals() method
- 19 Using color with and Bit and
- 20 Using the getRGB() method for comparing colors
Color class is used to work with colors in Java 2D
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);
}
}
Color Factory
/*
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;
}
}
}
Construct Color object
import java.awt.BorderLayout;
import java.awt.Color;
import javax.swing.JButton;
import javax.swing.JFrame;
public class ColorSample {
public static void main(String args[]) {
JFrame f = new JFrame("JColorChooser Sample");
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
final JButton button = new JButton("Pick to Change Background");
Color myBlack = new Color(0,0,0); // Color black
// Color myWhite = new Color(255,255,255); // Color white
// Color myGreen = new Color(0,200,0); // A shade of green
button.setBackground(myBlack);
f.add(button, BorderLayout.CENTER);
f.setSize(300, 200);
f.setVisible(true);
}
}
Constructs several colors and draws various objects using these colors:
import java.awt.Color;
import java.awt.Graphics;
import javax.swing.JFrame;
public class ColorVariousObjects extends JFrame {
public static void main(String[] a){
ColorVariousObjects f = new ColorVariousObjects();
f.setSize(300,300);
f.setVisible(true);
}
public void paint(Graphics g) {
Color c1 = new Color(255, 100, 100);
Color c2 = new Color(100, 255, 100);
Color c3 = new Color(100, 100, 255);
g.setColor(c1);
g.drawLine(0, 0, 100, 100);
g.drawLine(0, 100, 100, 0);
g.setColor(c2);
g.drawLine(40, 25, 250, 180);
g.drawLine(75, 90, 400, 400);
g.setColor(c3);
g.drawLine(20, 150, 400, 40);
g.drawLine(5, 290, 80, 19);
g.setColor(Color.red);
g.drawOval(10, 10, 50, 50);
g.fillOval(70, 90, 140, 100);
g.setColor(Color.blue);
g.drawOval(190, 10, 90, 30);
g.drawRect(10, 10, 60, 50);
g.setColor(Color.cyan);
g.fillRect(100, 10, 60, 50);
g.drawRoundRect(190, 10, 60, 50, 15, 15);
}
}
Convert an integer to an HTML RGB value
/*******************************************************************************
* Copyright (c) 2004 Actuate Corporation.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Actuate Corporation - initial API and implementation
*******************************************************************************/
/**
* Collection of string utilities.
*
*/
public class StringUtil
{
/**
* Convert an integer to an HTML RGB value. The result is of the form
* #hhhhhh. The input rgb integer value will be clipped into the range 0 ~
* 0xFFFFFF
*
* @param rgb
* the integer RGB value
* @return the value as an HTML RGB string
*/
public static String toRgbText( int rgb )
{
// clip input value.
if ( rgb > 0xFFFFFF )
rgb = 0xFFFFFF;
if ( rgb < 0 )
rgb = 0;
String str = "000000" + Integer.toHexString( rgb ); //$NON-NLS-1$
return "#" + str.substring( str.length( ) - 6 ); //$NON-NLS-1$
}
}
Convert HSB to RGB value
import java.awt.Color;
public class Main {
public static void main() {
float hue = 12;
float saturation = 13;
float brightness = 14;
int rgb = Color.HSBtoRGB(hue, saturation, brightness);
int red = (rgb >> 16) & 0xFF;
int green = (rgb >> 8) & 0xFF;
int blue = rgb & 0xFF;
}
}
Convert RGB to HSB
import java.awt.Color;
public class Main {
public static void main() {
int red = 23;
int green = 66;
int blue = 99;
float[] hsb = Color.RGBtoHSB(red, green, blue, null);
float hue = hsb[0];
float saturation = hsb[1];
float brightness = hsb[2];
}
}
Converts a given string into a color.
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;
}
}
}
}
Converts the String representation of a color to an actual Color object.
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 the <code>String</code> representation of a color to an actual
* <code>Color</code> object.
*
* @param value String representation of the color in "r,g,b" format (e.g.
* "100,255,0")
* @return <code>Color</code> object that matches the red-green-blue values
* provided by the parameter. Returns <code>null</code> for 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;
}
}
Derives a color by adding the specified offsets to the base color"s hue, saturation, and brightness values
/*
* 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]));
}
}
Drawing with Color
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));
}
}
Get HTML Color String from Java Color object
import java.awt.Color;
public class Utils {
public static String getHTMLColorString(Color color) {
String red = Integer.toHexString(color.getRed());
String green = Integer.toHexString(color.getGreen());
String blue = Integer.toHexString(color.getBlue());
return "#" +
(red.length() == 1? "0" + red : red) +
(green.length() == 1? "0" + green : green) +
(blue.length() == 1? "0" + blue : blue);
}
}
HTML color and Java Color
/**
* Licensed under the Common Development and Distribution License,
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.sun.ru/cddl/
*
* 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.
*/
//Revised from ajax4jsf
import java.awt.Color;
import java.util.HashMap;
import java.util.Map;
/**
* @author shura (latest modification by $Author: slava_kabanovich $)
* @version $Revision: 1.2 $ $Date: 2006/07/12 14:59:33 $
*
*/
public class HtmlColor {
private static Map colorNames;
static {
// color names.
colorNames = new HashMap();
colorNames.put("black", new Color(0x000000));
colorNames.put("green", new Color(0x008000));
colorNames.put("silver", new Color(0xC0C0C0));
colorNames.put("lime", new Color(0x00FF00));
colorNames.put("gray", new Color(0x808080));
colorNames.put("olive", new Color(0x808000));
colorNames.put("white", new Color(0xFFFFFF));
colorNames.put("yellow", new Color(0xFFFF00));
colorNames.put("maroon", new Color(0x800000));
colorNames.put("navy", new Color(0x000080));
colorNames.put("red", new Color(0xFF0000));
colorNames.put("blue", new Color(0x0000FF));
colorNames.put("purple", new Color(0x800080));
colorNames.put("teal", new Color(0x008080));
colorNames.put("fuchsia", new Color(0xFF00FF));
colorNames.put("aqua", new Color(0x00FFFF));
}
/**
* Decode HTML-attribute style of color to {@link Color}
* @param color - color name or #RRGGBB string
* @return - color for this value.
*/
public static Color decode(String color){
if(null == color) {
throw new IllegalArgumentException("NULL_COLOR_PARAMETER_ERROR");
}
Color c = (Color) colorNames.get(color.trim().toLowerCase());
if (null == c) {
try {
c = Color.decode(color.trim());
} catch (NumberFormatException e) {
throw new IllegalArgumentException("DECODE_COLOR_PARAMETER_ERROR");
}
}
return c;
}
public static Integer integerValue(String color){
return new Integer(decode(color).getRGB());
}
public static String encodeRGB(Color color){
if(null == color) {
throw new IllegalArgumentException("NULL_COLOR_PARAMETER_ERROR_2");
}
return "#" + Integer.toHexString(color.getRGB()).substring(2).toUpperCase();
}
}
java.awt.Color
A Color object represents a color. Color class provides static fields that return a specific Color object: BLACK, BLUE, GREEN, RED, CYAN, ORANGE, YELLOW.
For example, to obtain a Color object that represents green, use this code:
Color color = Color.GREEN;
Java Predefined Colors
Predefined ColorRGB Valuesblack(0,0,0)blue(0,0,255)cyan(0,255,255)darkGray(64,64,64)gray(128,128,128)green(0,255,0)lightGray(192,192,192)magenta(255,0,255)orange(255,200,0)pink(255,175,175)red(255,0,0)white(255,255,255)yellow(255,255,0)
Map colors into names and vice versa.
/**
*
* 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;
}
}
Set XOR mode to color blue
// This example is from the book _Java AWT Reference_ by John Zukowski.
// Written by John Zukowski. Copyright (c) 1997 O"Reilly & Associates.
// You may study, use, modify, and distribute this example for any purpose.
// This example is provided WITHOUT WARRANTY either expressed or
import java.awt.Color;
import java.awt.Graphics;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class xorTest extends JPanel{
public void init () {
setBackground (Color.red);
}
public void paint (Graphics g) {
g.setColor (Color.green);
g.setXORMode (Color.blue);
g.fillRect (10, 10, 100, 100);
g.fillRect (10, 60, 100, 100);
}
public static void main(String[] a){
JFrame f = new JFrame();
f.add(new xorTest());
f.setSize(300,300);
f.setVisible(true);
}
}
To compare two Color objects you can use the equals() method
import java.awt.Color;
public class MainClass {
public static void main(String[] a) {
Color myBlack = new Color(0, 0, 0); // Color black
Color myWhite = new Color(255, 255, 255); // Color white
System.out.println(myBlack.equals(myWhite));
}
}
false
Using color with and Bit and
import java.awt.Color;
import java.awt.Graphics;
import javax.swing.JComponent;
import javax.swing.JFrame;
class MyCanvas extends JComponent {
Color[] colors = new Color[24];
public MyCanvas() {
int rgb = 0xff;
for (int i = 0; i < 24; i++) {
colors[i] = new Color(rgb);
rgb <<= 1;
if ((rgb & 0x1000000) != 0) {
rgb |= 1;
rgb &= 0xffffff;
}
}
}
public void paint(Graphics g) {
int i = 10;
for (Color c : colors) {
g.setColor(c);
i += 10;
g.drawLine(i, 10, 200, 200);
}
}
}
public class DrawLine {
public static void main(String[] a) {
JFrame window = new JFrame();
window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
window.setBounds(30, 30, 300, 300);
window.getContentPane().add(new MyCanvas());
window.setVisible(true);
}
}
Using the getRGB() method for comparing colors
import java.awt.Color;
public class MainClass {
public static void main(String[] a) {
Color myBlack = new Color(0, 0, 0); // Color black
Color myWhite = new Color(255, 255, 255); // Color white
System.out.println(myBlack.getRGB() == myWhite.getRGB());
System.out.println(myBlack.getRGB());
System.out.println(myWhite.getRGB());
}
}
false -16777216 -1
