Java Tutorial/2D Graphics

Содержание

1 calls stringWidth (String) to center several text messages
2 Center text.
3 Create Bold and Italic font
4 Create font from true type font
5 Creating Serif Font
6 Display a text in 3 dimensions
7 Display font in a grid
8 Display font info.
9 Draw font metrics
10 Draw text to the center
11 Draw text to the left
12 Draw text to the right
13 Font base line
14 Font Metrics: the wealth of dimensional data about a font
15 Fonts exercise: a font chooser
16 Getting Char with based on current font
17 java.awt.Font
18 Obtain FontMetrics of different fonts
19 Show all Fonts installed in your system
20 Show fonts with mouse click
21 System fonts display
22 Text justify
23 The Three Font Styles
24 To change the size and/or style of a font, you call its deriveFont() method
25 To get all available fonts in your system
26 To get the font names
27 Use fonts in paint
28 Using FontRenderContext

calls stringWidth (String) to center several text messages

   <source lang="java">

import java.awt.FontMetrics; import java.awt.Graphics; import javax.swing.JFrame; import javax.swing.JPanel; public class FontMetricsStringWidth extends JPanel {

 public static void main(String[] a) {
   JFrame f = new JFrame();
   f.setSize(400, 400);
   f.add(new FontMetricsStringWidth());
   f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   f.setVisible(true);
 }
 public void paint(Graphics g) {
   String[] msgs = { "AAAAAAAAA", "VVVVVVVVVVVVVVVVV", "BBBBBBBBBBBBBBBBBBBBBBBBBBBBBB" };
   FontMetrics fm = g.getFontMetrics();
   for (int i = 0; i < msgs.length; i++) {
     int x = (getSize().width - fm.stringWidth(msgs[i])) / 2;
     int y = fm.getHeight() * (i + 1);
     g.drawString(msgs[i], x, y);
   }
 }

}</source>

Center text.

   <source lang="java">

import java.awt.Color; import java.awt.Dimension; import java.awt.Font; import java.awt.FontMetrics; import java.awt.Graphics; import javax.swing.JFrame; public class CenterTextRectangle extends JFrame {

 public static void main(String[] a) {
   CenterTextRectangle f = new CenterTextRectangle();
   f.setSize(300, 300);
   f.setVisible(true);
 }
 final Font f = new Font("SansSerif", Font.BOLD, 18);
 public void paint(Graphics g) {
   Dimension d = this.getSize();
   g.setColor(Color.white);
   g.fillRect(0, 0, d.width, d.height);
   g.setColor(Color.black);
   g.setFont(f);
   drawCenteredString("This is centered.", d.width, d.height, g);
   g.drawRect(0, 0, d.width - 1, d.height - 1);
 }
 public void drawCenteredString(String s, int w, int h, Graphics g) {
   FontMetrics fm = g.getFontMetrics();
   int x = (w - fm.stringWidth(s)) / 2;
   int y = (fm.getAscent() + (h - (fm.getAscent() + fm.getDescent())) / 2);
   g.drawString(s, x, y);
 }

}</source>

Create Bold and Italic font

   <source lang="java">

import java.awt.BorderLayout; import java.awt.Font; import javax.swing.JButton; import javax.swing.JFrame; public class CreatingSerifItalicBoldFont {

 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");
   Font myFont = new Font("Serif", Font.ITALIC | Font.BOLD, 12);
   button.setFont(myFont);
   f.add(button, BorderLayout.CENTER);
   f.setSize(300, 200);
   f.setVisible(true);
 }

}</source>

Create font from true type font

   <source lang="java">

import java.awt.Font; import java.io.File; import java.io.FileInputStream; import javax.swing.JFrame; import javax.swing.JLabel; public class Main {

 public static void main(String[] args) throws Exception {
   File f = new File("your.ttf");
   FileInputStream in = new FileInputStream(f);
   Font dynamicFont = Font.createFont(Font.TRUETYPE_FONT, in);
   Font dynamicFont32Pt = dynamicFont.deriveFont(32f);
   JLabel testLabel = new JLabel("Dynamically loaded font \"" + dynamicFont.getName() + "\"");
   testLabel.setFont(dynamicFont32Pt);
   JFrame frame = new JFrame("Font Loading Demo");
   frame.getContentPane().add(testLabel);
   frame.pack();
   frame.setVisible(true);
 }

}</source>

Creating Serif Font

   <source lang="java">

import java.awt.BorderLayout; import java.awt.Font; import javax.swing.JButton; import javax.swing.JFrame; public class CreatingSerifItalicFont {

 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");
   Font myFont = new Font("Serif", Font.ITALIC, 12);
   button.setFont(myFont);
   f.add(button, BorderLayout.CENTER);
   f.setSize(300, 200);
   f.setVisible(true);
 }

}</source>

Display a text in 3 dimensions

   <source lang="java">

// 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.Dimension; import java.awt.FontMetrics; import java.awt.Graphics; import java.awt.SystemColor; import javax.swing.JFrame; import javax.swing.JPanel; public class TextBox3D extends JPanel{

   String text;
   public TextBox3D (String s, int width, int height) {
       super();
       text=s;
       setSize(width, height);
   }
   public synchronized void paint (Graphics g) {
       FontMetrics fm = g.getFontMetrics();
       Dimension size=getSize();
       int x = (size.width - fm.stringWidth(text))/2;
       int y = (size.height - fm.getHeight())/2;
       g.setColor (SystemColor.control);
       g.fillRect (0, 0, size.width, size.height);
       g.setColor (SystemColor.controlShadow);
       g.drawLine (0, 0, 0, size.height-1);
       g.drawLine (0, 0, size.width-1, 0);
       g.setColor (SystemColor.controlDkShadow);
       g.drawLine (0, size.height-1, size.width-1, size.height-1);
       g.drawLine (size.width-1, 0, size.width-1, size.height-1);
       g.setColor (SystemColor.controlText);
       g.drawString (text, x, y);
   }
   public static void main (String[] args) {
     JFrame f = new JFrame();
     f.add(new TextBox3D ("Help Me", 200, 200));
     f.setSize(300,300);
     f.setVisible(true);
   }

}</source>

Display font in a grid

   <source lang="java">

import java.awt.Font; import java.awt.Graphics; import javax.swing.JFrame; import javax.swing.JPanel; public class Main {

 public static void main(String[] args) {
   final int w = 20;
   final int side = 25;
   final int[][] grid = new int[50][w];
   JPanel panel = new JPanel() {
     public void paintComponent(Graphics g) {
       Font font = new Font("WingDings", Font.PLAIN, 14);
       g.setFont(font);
       int off = 0;
       for (int i = 0; i < 256 * 256; i++) {
         if (font.canDisplay((char) i)) {
           off++;
           grid[off / w][off % w] = i;
           int x = off % w * side;
           int y = (off / w) * side + side;
           g.drawString("" + (char) i, x, y);
         }
       }
     }
   };
   JFrame frame = new JFrame();
   panel.setSize(300, 300);
   frame.getContentPane().add(panel);
   frame.setSize(300, 300);
   frame.setVisible(true);
 }

}</source>

Display font info.

   <source lang="java">

import java.awt.Font; import java.awt.Graphics; import javax.swing.JFrame; public class MainClass extends JFrame {

 public static void main(String[] a) {
   MainClass f = new MainClass();
   f.setSize(300, 300);
   f.setVisible(true);
 }
 public void paint(Graphics g) {
   Font f = g.getFont();
   String fontName = f.getName();
   String fontFamily = f.getFamily();
   int fontSize = f.getSize();
   int fontStyle = f.getStyle();
   String msg = "Family: " + fontName;
   msg += ", Font: " + fontFamily;
   msg += ", Size: " + fontSize + ", Style: ";
   if ((fontStyle & Font.BOLD) == Font.BOLD)
     msg += "Bold ";
   if ((fontStyle & Font.ITALIC) == Font.ITALIC)
     msg += "Italic ";
   if ((fontStyle & Font.PLAIN) == Font.PLAIN)
     msg += "Plain ";
   g.drawString(msg, 4, 16);
 }

}</source>

Draw font metrics

   <source lang="java">

// 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.Font; import java.awt.FontMetrics; import java.awt.Graphics; import javax.swing.JFrame; import javax.swing.JPanel; public class metrics extends JPanel {

   metrics () {
       setFont (new Font ("TimesRoman", Font.BOLD | Font.ITALIC, 48));
       setSize (225, 175);
   }
   public void paint (Graphics g) {
       g.translate (100, 100);
       FontMetrics fm = null;
       int ascent, descent, leading, width1, width2, height;
       String string1 = "dsdas";
       String string2 = "asdf";
       int xPos = 25, yPos = 50;
       fm = g.getFontMetrics();
       ascent  = fm.getAscent();
       descent = fm.getDescent();
       leading = fm.getLeading();
       height  = fm.getHeight();
       width1  = fm.stringWidth (string1);
       width2  = fm.stringWidth (string2);
       g.drawString (string1, xPos, yPos);
       g.drawLine (xPos, yPos - ascent - leading,
                   xPos + width1, yPos - ascent - leading);
       g.drawLine (xPos, yPos - ascent,
                   xPos + width1, yPos - ascent);
       g.drawLine (xPos, yPos,
                   xPos + width1, yPos);
       g.drawLine (xPos, yPos + descent,
                   xPos + width1, yPos + descent);
       g.drawString (string2, xPos, yPos+height);
       g.drawLine (xPos, yPos - ascent - leading + height,
                   xPos + width2, yPos - ascent - leading + height);
       g.drawLine (xPos, yPos - ascent + height,
                   xPos + width2, yPos - ascent + height);
       g.drawLine (xPos, yPos + height,
                   xPos + width2, yPos + height);
       g.drawLine (xPos, yPos + descent + height,
                   xPos + width2, yPos + descent + height);
   }
   public static void main (String[] args) {
     JFrame f = new JFrame();
     f.add(new metrics());
     f.setSize(300,300);
     f.setVisible(true);
   }

}</source>

Draw text to the center

   <source lang="java">

import java.awt.Color; import java.awt.Dimension; import java.awt.Font; import java.awt.FontMetrics; import java.awt.Graphics; import java.util.StringTokenizer; import javax.swing.JFrame; import javax.swing.JPanel; public class TextLayoutCenter extends JPanel {

 Dimension d;
 Font f = new Font("fontname", Font.PLAIN, 20);
 FontMetrics fm;
 int fh, ascent;
 int space;
 public static void main(String[] a) {
   JFrame f = new JFrame();
   f.setSize(300, 300);
   f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   f.getContentPane().add(new TextLayoutCenter());
   f.setVisible(true);
 }
 public void paint(Graphics g) {
   d = getSize();
   g.setFont(f);
   if (fm == null) {
     fm = g.getFontMetrics();
     ascent = fm.getAscent();
     fh = ascent + fm.getDescent();
     space = fm.stringWidth(" ");
   }
   g.setColor(Color.black);
   StringTokenizer st = new StringTokenizer("this is a text. this is a test 
 this is a text. this is a test");
   int x = 0;
   int nextx;
   int y = 0;
   String word, sp;
   int wordCount = 0;
   String line = "";
   while (st.hasMoreTokens()) {
     word = st.nextToken();
     if (word.equals("
")) {
       drawString(g, line, wordCount, fm.stringWidth(line), y + ascent);
       line = "";
       wordCount = 0;
       x = 0;
       y = y + (fh * 2);
     } else {
       int w = fm.stringWidth(word);
       if ((nextx = (x + space + w)) > d.width) {
         drawString(g, line, wordCount, fm.stringWidth(line), y + ascent);
         line = "";
         wordCount = 0;
         x = 0;
         y = y + fh;
       }
       if (x != 0) {
         sp = " ";
       } else {
         sp = "";
       }
       line = line + sp + word;
       x = x + space + w;
       wordCount++;
     }
   }
   drawString(g, line, wordCount, fm.stringWidth(line), y + ascent);
 }
 public void drawString(Graphics g, String line, int wc, int lineW, int y) {
   g.drawString(line, (d.width - lineW) / 2, y);//center
 }

}</source>

Draw text to the left

   <source lang="java">

import java.awt.Color; import java.awt.Dimension; import java.awt.Font; import java.awt.FontMetrics; import java.awt.Graphics; import java.util.StringTokenizer; import javax.swing.JFrame; import javax.swing.JPanel; public class TextLayoutLeft extends JPanel {

 Dimension d;
 Font f = new Font("fontname", Font.PLAIN, 20);
 FontMetrics fm;
 int fh, ascent;
 int space;
 public static void main(String[] a) {
   JFrame f = new JFrame();
   f.setSize(300, 300);
   f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   f.getContentPane().add(new TextLayoutLeft());
   f.setVisible(true);
 }
 public void paint(Graphics g) {
   d = getSize();
   g.setFont(f);
   if (fm == null) {
     fm = g.getFontMetrics();
     ascent = fm.getAscent();
     fh = ascent + fm.getDescent();
     space = fm.stringWidth(" ");
   }
   g.setColor(Color.black);
   StringTokenizer st = new StringTokenizer("this is a text. this is a test 
 this is a text. this is a test");
   int x = 0;
   int nextx;
   int y = 0;
   String word, sp;
   int wordCount = 0;
   String line = "";
   while (st.hasMoreTokens()) {
     word = st.nextToken();
     if (word.equals("
")) {
       drawString(g, line, wordCount, fm.stringWidth(line), y + ascent);
       line = "";
       wordCount = 0;
       x = 0;
       y = y + (fh * 2);
     } else {
       int w = fm.stringWidth(word);
       if ((nextx = (x + space + w)) > d.width) {
         drawString(g, line, wordCount, fm.stringWidth(line), y + ascent);
         line = "";
         wordCount = 0;
         x = 0;
         y = y + fh;
       }
       if (x != 0) {
         sp = " ";
       } else {
         sp = "";
       }
       line = line + sp + word;
       x = x + space + w;
       wordCount++;
     }
   }
   drawString(g, line, wordCount, fm.stringWidth(line), y + ascent);
 }
 public void drawString(Graphics g, String line, int wc, int lineW, int y) {
     g.drawString(line, 0, y);
 }

}</source>

Draw text to the right

   <source lang="java">

import java.awt.Color; import java.awt.Dimension; import java.awt.Font; import java.awt.FontMetrics; import java.awt.Graphics; import java.util.StringTokenizer; import javax.swing.JFrame; import javax.swing.JPanel; public class TextLayoutRight extends JPanel {

 Dimension d;
 Font f = new Font("fontname", Font.PLAIN, 20);
 FontMetrics fm;
 int fh, ascent;
 int space;
 public static void main(String[] a) {
   JFrame f = new JFrame();
   f.setSize(300, 300);
   f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   f.getContentPane().add(new TextLayoutRight());
   f.setVisible(true);
 }
 public void paint(Graphics g) {
   d = getSize();
   g.setFont(f);
   if (fm == null) {
     fm = g.getFontMetrics();
     ascent = fm.getAscent();
     fh = ascent + fm.getDescent();
     space = fm.stringWidth(" ");
   }
   g.setColor(Color.black);
   StringTokenizer st = new StringTokenizer("this is a text. this is a test 
 this is a text. this is a test");
   int x = 0;
   int nextx;
   int y = 0;
   String word, sp;
   int wordCount = 0;
   String line = "";
   while (st.hasMoreTokens()) {
     word = st.nextToken();
     if (word.equals("
")) {
       drawString(g, line, wordCount, fm.stringWidth(line), y + ascent);
       line = "";
       wordCount = 0;
       x = 0;
       y = y + (fh * 2);
     } else {
       int w = fm.stringWidth(word);
       if ((nextx = (x + space + w)) > d.width) {
         drawString(g, line, wordCount, fm.stringWidth(line), y + ascent);
         line = "";
         wordCount = 0;
         x = 0;
         y = y + fh;
       }
       if (x != 0) {
         sp = " ";
       } else {
         sp = "";
       }
       line = line + sp + word;
       x = x + space + w;
       wordCount++;
     }
   }
   drawString(g, line, wordCount, fm.stringWidth(line), y + ascent);
 }
 public void drawString(Graphics g, String line, int wc, int lineW, int y) {
   g.drawString(line, d.width - lineW, y); //right
 }

}</source>

Font base line

   <source lang="java">

import java.awt.Color; import java.awt.Font; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.RenderingHints; import java.awt.Shape; import java.awt.font.FontRenderContext; import java.awt.font.LineMetrics; import javax.swing.JComponent; import javax.swing.JFrame; public class FontShow extends JComponent {

 public void paint(Graphics g) {
   Graphics2D g2 = (Graphics2D) g;
   g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
   Font font = new Font("Dialog", Font.PLAIN, 96);
   g2.setFont(font);
   int width = getSize().width;
   int height = getSize().height;
   String message = "jexp";
   FontRenderContext frc = g2.getFontRenderContext();
   LineMetrics metrics = font.getLineMetrics(message, frc);
   float messageWidth = (float) font.getStringBounds(message, frc).getWidth();
   // center text
   float ascent = metrics.getAscent();
   float descent = metrics.getDescent();
   float x = (width - messageWidth) / 2;
   float y = (height + metrics.getHeight()) / 2 - descent;
   int PAD = 25;
   g2.setPaint(getBackground());
   g2.fillRect(0, 0, width, height);
   g2.setPaint(getForeground());
   g2.drawString(message, x, y);
   g2.setPaint(Color.white); // Base lines
   drawLine(g2, x - PAD, y, x + messageWidth + PAD, y);
   drawLine(g2, x, y + PAD, x, y - ascent - PAD);
   g2.setPaint(Color.green); // Ascent line
   drawLine(g2, x - PAD, y - ascent, x + messageWidth + PAD, y - ascent);
   g2.setPaint(Color.red); // Descent line
   drawLine(g2, x - PAD, y + descent, x + messageWidth + PAD, y + descent);
 }
 private void drawLine(Graphics2D g2, double x0, double y0, double x1, double y1) {
   Shape line = new java.awt.geom.Line2D.Double(x0, y0, x1, y1);
   g2.draw(line);
 }
 public static void main(String args[]) {
   JFrame frame = new JFrame();
   frame.setSize(420, 300);
   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   frame.add(new FontShow());
   frame.setVisible(true);
 }

}</source>

Font Metrics: the wealth of dimensional data about a font

   <source lang="java">

import java.awt.FontMetrics; import javax.swing.JFrame; public class GettingFontMetrics {

 public static void main(String args[]) {
   JFrame f = new JFrame("JColorChooser Sample");
   f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   FontMetrics metrics = f.getFontMetrics(f.getFont());
   
   
   f.setSize(300, 200);
   f.setVisible(true);
 }

}</source>

Fonts exercise: a font chooser

   <source lang="java">

import java.awt.BorderLayout; import java.awt.Font; import java.awt.GraphicsEnvironment; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JCheckBox; import javax.swing.JComboBox; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; public class FontStyleSizeFamilyChooser extends JFrame {

 public static void main(String[] args) {
   new FontStyleSizeFamilyChooser();
 }
 private JLabel sampleText = new JLabel("Label");
 private JComboBox fontComboBox;
 private JComboBox sizeComboBox;
 private JCheckBox boldCheck, italCheck;
 private String[] fonts;
 public FontStyleSizeFamilyChooser() {
   this.setSize(500, 150);
   this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   FontListener fl = new FontListener();
   this.add(sampleText, BorderLayout.NORTH);
   GraphicsEnvironment g = GraphicsEnvironment.getLocalGraphicsEnvironment();
   fonts = g.getAvailableFontFamilyNames();
   JPanel controlPanel = new JPanel();
   fontComboBox = new JComboBox(fonts);
   fontComboBox.addActionListener(fl);
   controlPanel.add(new JLabel("Family: "));
   controlPanel.add(fontComboBox);
   Integer[] sizes = { 7, 8, 9, 10, 11, 12, 14, 18, 20, 22, 24, 36 };
   sizeComboBox = new JComboBox(sizes);
   sizeComboBox.setSelectedIndex(5);
   sizeComboBox.addActionListener(fl);
   controlPanel.add(new JLabel("Size: "));
   controlPanel.add(sizeComboBox);
   boldCheck = new JCheckBox("Bold");
   boldCheck.addActionListener(fl);
   controlPanel.add(boldCheck);
   italCheck = new JCheckBox("Ital");
   italCheck.addActionListener(fl);
   controlPanel.add(italCheck);
   this.add(controlPanel, BorderLayout.SOUTH);
   fl.updateText();
   this.setVisible(true);
 }
 private class FontListener implements ActionListener {
   public void actionPerformed(ActionEvent e) {
     updateText();
   }
   public void updateText() {
     String name = (String) fontComboBox.getSelectedItem();
     Integer size = (Integer) sizeComboBox.getSelectedItem();
     int style;
     if (boldCheck.isSelected() && italCheck.isSelected())
       style = Font.BOLD | Font.ITALIC;
     else if (boldCheck.isSelected())
       style = Font.BOLD;
     else if (italCheck.isSelected())
       style = Font.ITALIC;
     else
       style = Font.PLAIN;
     Font f = new Font(name, style, size.intValue());
     sampleText.setFont(f);
   }
 }

}</source>

Getting Char with based on current font

   <source lang="java">

import java.awt.FontMetrics; import javax.swing.JFrame; public class GettingFontMetrics {

 public static void main(String args[]) {
   JFrame f = new JFrame("JColorChooser Sample");
   f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   
   f.setSize(300, 200);
   f.setVisible(true);
   
   FontMetrics metrics = f.getFontMetrics(f.getFont());
   int widthX = metrics.charWidth("X");
   System.out.println(widthX);
   
 }

}</source>

java.awt.Font

A Font object represents a font. Here is a constructor of the Font class.

   <source lang="java">

public Font (java.lang.String name, int style, int size)</source>

Obtain FontMetrics of different fonts

   <source lang="java">

import java.awt.Font; import java.awt.FontMetrics; import java.awt.Graphics; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; import javax.swing.JFrame; public class Main extends JFrame {

 public Main() {
   super("Demonstrating FontMetrics");
   setSize(510, 210);
   setVisible(true);
   setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 }
 public void paint(Graphics g) {
   g.setFont(new Font("SansSerif", Font.BOLD, 12));
   FontMetrics fm = g.getFontMetrics();
   g.drawString("Current font: " + g.getFont(), 10, 40);
   g.drawString("Ascent: " + fm.getAscent(), 10, 55);
   g.drawString("Descent: " + fm.getDescent(), 10, 70);
   g.drawString("Height: " + fm.getHeight(), 10, 85);
   g.drawString("Leading: " + fm.getLeading(), 10, 100);
   Font font = new Font("Serif", Font.ITALIC, 14);
   fm = g.getFontMetrics(font);
   g.setFont(font);
   g.drawString("Current font: " + font, 10, 130);
   g.drawString("Ascent: " + fm.getAscent(), 10, 145);
   g.drawString("Descent: " + fm.getDescent(), 10, 160);
   g.drawString("Height: " + fm.getHeight(), 10, 175);
   g.drawString("Leading: " + fm.getLeading(), 10, 190);
 }
 public static void main(String args[]) {
   Main app = new Main();
 }

}</source>

Show all Fonts installed in your system

   <source lang="java">

import java.awt.Color; import java.awt.Font; import java.awt.Graphics; import java.awt.GraphicsEnvironment; import javax.swing.JFrame; import javax.swing.JPanel; public class PaintAllFontsFromGraphicEvironment extends JPanel {

 public static void main(String[] a){
   JFrame f = new JFrame();
   f.setSize(400,400);
   f.add(new PaintAllFontsFromGraphicEvironment());
   f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   f.setVisible(true);
 }
 
 public void paint(Graphics g) {
   GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
   Font[] allFonts = ge.getAllFonts();
   for (int i = 0; i < allFonts.length; i++) {
     Font f = allFonts[i].deriveFont(10.0f);
     g.setFont(f);
     g.setColor(Color.black);
     g.drawString("Hello!", 10, 20*i);
   }
 }

}</source>

Show fonts with mouse click

   <source lang="java">

import java.applet.Applet; import java.awt.Font; import java.awt.Graphics; import java.awt.event.MouseAdapter; import java.awt.event.MouseEvent; public class MainClass extends Applet {

 int next = 0;
 Font f;
 String msg;
 public void init() {
   f = new Font("Dialog", Font.PLAIN, 12);
   msg = "Dialog";
   setFont(f);
   addMouseListener(new MyMouseAdapter(this));
 }
 public void paint(Graphics g) {
   g.drawString(msg, 4, 20);
 }

} class MyMouseAdapter extends MouseAdapter {

 MainClass sampleFonts;
 public MyMouseAdapter(MainClass sampleFonts) {
   this.sampleFonts = sampleFonts;
 }
 public void mousePressed(MouseEvent me) {
   sampleFonts.next++;
   switch (sampleFonts.next) {
   case 0:
     sampleFonts.f = new Font("Dialog", Font.PLAIN, 12);
     sampleFonts.msg = "Dialog";
     break;
   case 1:
     sampleFonts.f = new Font("DialogInput", Font.PLAIN, 12);
     sampleFonts.msg = "DialogInput";
     break;
   case 2:
     sampleFonts.f = new Font("SansSerif", Font.PLAIN, 12);
     sampleFonts.msg = "SansSerif";
     break;
   case 3:
     sampleFonts.f = new Font("Serif", Font.PLAIN, 12);
     sampleFonts.msg = "Serif";
     break;
   case 4:
     sampleFonts.f = new Font("Monospaced", Font.PLAIN, 12);
     sampleFonts.msg = "Monospaced";
     break;
   }
   if (sampleFonts.next == 4)
     sampleFonts.next = -1;
   sampleFonts.setFont(sampleFonts.f);
   sampleFonts.repaint();
 }

}</source>

System fonts display

   <source lang="java">

import java.awt.BorderLayout; import java.awt.Container; import java.awt.Font; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.GraphicsEnvironment; import java.awt.GridLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JComboBox; import javax.swing.JFrame; import javax.swing.JPanel; public class SystemFontDisplayer extends JFrame {

 DisplayPanel displayPanel;
 String[] fontStyleLabels = { "Plain", "Bold", "Italic", "Bold&Italic" };
 int BOLDITALIC = Font.BOLD | Font.ITALIC;
 int[] fontStyles = { Font.PLAIN, Font.BOLD, Font.ITALIC, BOLDITALIC };
 String[] fontSizeLabels = { "8", "9", "10", "11", "12", "14", "18", "25",
     "36", "72" };
 JComboBox fontsBox, 
 fontStylesBox = new JComboBox(fontStyleLabels), fontSizesBox  = new JComboBox(fontSizeLabels);
 public SystemFontDisplayer() {
   Container container = getContentPane();
   displayPanel = new DisplayPanel();
   container.add(displayPanel);
   JPanel controlPanel = new JPanel();
   controlPanel.setLayout(new GridLayout(1, 3));
   fontsBox= new JComboBox(displayPanel.fontFamilyNames);
   fontsBox.setSelectedItem("Arial"); 
   fontsBox.addActionListener(new ComboBoxListener());
   fontStylesBox.addActionListener(new ComboBoxListener());
   fontSizesBox.setSelectedItem("36");
   fontSizesBox.addActionListener(new ComboBoxListener());
   controlPanel.add(fontsBox);
   controlPanel.add(fontStylesBox);
   controlPanel.add(fontSizesBox);
   container.add(BorderLayout.SOUTH, controlPanel);
   setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   pack();
   setSize(400, 250);
   setVisible(true);
 }
 public static void main(String arg[]) {
   new SystemFontDisplayer();
 }
 class ComboBoxListener implements ActionListener {
   public void actionPerformed(ActionEvent e) {
     JComboBox tempBox = (JComboBox) e.getSource();
     if (tempBox.equals(fontsBox)) {
       displayPanel.fontFamilyName = (String) tempBox.getSelectedItem();
       displayPanel.repaint();
     } else if (tempBox.equals(fontStylesBox)) {
       displayPanel.fontStyle = fontStyles[tempBox.getSelectedIndex()];
       displayPanel.repaint();
     } else if (tempBox.equals(fontSizesBox)) {
       displayPanel.fontSize = Integer.parseInt((String) tempBox
           .getSelectedItem());
       displayPanel.repaint();
     }
   }
 }
 class DisplayPanel extends JPanel {
   String fontFamilyName;
   int fontStyle;
   int fontSize;
   String[] fontFamilyNames;
   public DisplayPanel() {
     fontFamilyName = "Arial";
     fontStyle = Font.PLAIN;
     fontSize = 36;
     GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
     fontFamilyNames = ge.getAvailableFontFamilyNames();
     setSize(400, 225); 
   }
   public void update(Graphics g) {
     g.clearRect(0, 0, getWidth(), getHeight());
     paintComponent(g);
   }
   public void paintComponent(Graphics g) {
     super.paintComponent(g);
     Graphics2D g2D = (Graphics2D) g;
     g2D.setFont(new Font(fontFamilyName, fontStyle, fontSize));
     g2D.drawString("Java 2D Fonts", 25, 100);
   }
 }

}</source>

Text justify

   <source lang="java">

import java.awt.Color; import java.awt.Dimension; import java.awt.Font; import java.awt.FontMetrics; import java.awt.Graphics; import java.util.StringTokenizer; import javax.swing.JFrame; import javax.swing.JPanel; public class TextLayoutJustify extends JPanel {

 Dimension d;
 Font f = new Font("fontname", Font.PLAIN, 20);
 FontMetrics fm;
 int fh, ascent;
 int space;
 public static void main(String[] a) {
   JFrame f = new JFrame();
   f.setSize(300, 300);
   f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   f.getContentPane().add(new TextLayoutJustify());
   f.setVisible(true);
 }
 public void paint(Graphics g) {
   d = getSize();
   g.setFont(f);
   if (fm == null) {
     fm = g.getFontMetrics();
     ascent = fm.getAscent();
     fh = ascent + fm.getDescent();
     space = fm.stringWidth(" ");
   }
   g.setColor(Color.black);
   StringTokenizer st = new StringTokenizer("this is a text. this is a test 
 this is a text. this is a test");
   int x = 0;
   int nextx;
   int y = 0;
   String word, sp;
   int wordCount = 0;
   String line = "";
   while (st.hasMoreTokens()) {
     word = st.nextToken();
     if (word.equals("
")) {
       drawString(g, line, wordCount, fm.stringWidth(line), y + ascent);
       line = "";
       wordCount = 0;
       x = 0;
       y = y + (fh * 2);
     } else {
       int w = fm.stringWidth(word);
       if ((nextx = (x + space + w)) > d.width) {
         drawString(g, line, wordCount, fm.stringWidth(line), y + ascent);
         line = "";
         wordCount = 0;
         x = 0;
         y = y + fh;
       }
       if (x != 0) {
         sp = " ";
       } else {
         sp = "";
       }
       line = line + sp + word;
       x = x + space + w;
       wordCount++;
     }
   }
   drawString(g, line, wordCount, fm.stringWidth(line), y + ascent);
 }
 public void drawString(Graphics g, String line, int wc, int lineWidth, int y) {
   if (lineWidth < (int) (d.width * .75)) {
     g.drawString(line, 0, y);
   } else {
     int toFill = (int) ((d.width - lineWidth) / wc);
     int nudge = d.width - lineWidth - (toFill * wc);
     StringTokenizer st = new StringTokenizer(line);
     int x = 0;
     while (st.hasMoreTokens()) {
       String word = st.nextToken();
       g.drawString(word, x, y);
       if (nudge > 0) {
         x = x + fm.stringWidth(word) + space + toFill + 1;
         nudge--;
       } else {
         x = x + fm.stringWidth(word) + space + toFill;
       }
     }
   }
 }

}</source>

The Three Font Styles

ConstantDescriptionFont.BOLDThe bold style constantFont.ITALICThe italicized style constantFont.PLAINThe plain style constant

To change the size and/or style of a font, you call its deriveFont() method

deriveFont(int Style): Creates a new Font object with the style specified - one of PLAIN, BOLD, ITALIC, or BOLD+ITALIC
deriveFont(float size): Creates a new Font object with the size specified
deriveFont(int Style, float size): Creates a new Font object with the style and size specified

   <source lang="java">

import java.awt.BorderLayout; import java.awt.Font; import javax.swing.JButton; import javax.swing.JFrame; public class DrivedFont {

 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");
   Font myFont = new Font("Serif", Font.ITALIC | Font.BOLD, 12);
   Font newFont = myFont.deriveFont(50F);
   button.setFont(newFont);
   f.add(button, BorderLayout.CENTER);
   f.setSize(300, 200);
   f.setVisible(true);
 }

}</source>

To get all available fonts in your system

   <source lang="java">

import java.awt.Font; import java.awt.GraphicsEnvironment; public class MainClass {

 public static void main(String[] a) {
   GraphicsEnvironment e = GraphicsEnvironment.getLocalGraphicsEnvironment();
   Font[] fonts = e.getAllFonts(); // Get the fonts
   for (Font f : fonts) {
     System.out.println(f.getFontName());
   }
 }

}</source>

Agency FB
Agency FB Bold
Arial
Arial Black
Arial Black Italic
Arial Bold
Arial Bold Italic
Arial Italic
Arial Narrow
Arial Narrow Bold
Arial Narrow Bold Italic
Arial Narrow Italic
Arial Rounded MT Bold
Arial-SM
Blackadder ITC
Bodoni MT
Bodoni MT Black
Bodoni MT Black Italic
Bodoni MT Bold
Bodoni MT Bold Italic
Bodoni MT Condensed
Bodoni MT Condensed Bold
Bodoni MT Condensed Bold Italic
Bodoni MT Condensed Italic
Bodoni MT Italic
Book Antiqua
Book Antiqua Bold
Book Antiqua Bold Italic
Book Antiqua Italic
Bookman Old Style
Bookman Old Style Bold
Bookman Old Style Bold Italic
Bookman Old Style Italic
Bookshelf Symbol 7
Bradley Hand ITC
Calisto MT
Calisto MT Bold
Calisto MT Bold Italic
Calisto MT Italic
Castellar
Century Gothic
Century Gothic Bold
Century Gothic Bold Italic
Century Gothic Italic
Century Schoolbook
Century Schoolbook Bold
Century Schoolbook Bold Italic
Century Schoolbook Italic
Comic Sans MS
Comic Sans MS Bold
Copperplate Gothic Bold
Copperplate Gothic Light
Courier New
Courier New Bold
Courier New Bold Italic
Courier New Italic
Curlz MT
Dialog.bold
Dialog.bolditalic
Dialog.italic
Dialog.plain
DialogInput.bold
DialogInput.bolditalic
DialogInput.italic
DialogInput.plain
Edwardian Script ITC
Elephant
Elephant Italic
Engravers MT
Eras Bold ITC
Eras Demi ITC
Eras Light ITC
Eras Medium ITC
Estrangelo Edessa
Felix Titling
Forte
Franklin Gothic Book
Franklin Gothic Book Italic
Franklin Gothic Demi
Franklin Gothic Demi Cond
Franklin Gothic Demi Italic
Franklin Gothic Heavy
Franklin Gothic Heavy Italic
Franklin Gothic Medium
Franklin Gothic Medium Cond
Franklin Gothic Medium Italic
French Script MT
Garamond
Garamond Bold
Garamond Italic
Gautami
Georgia
Georgia Bold
Georgia Bold Italic
Georgia Italic
Gigi
Gill Sans MT
Gill Sans MT Bold
Gill Sans MT Bold Italic
Gill Sans MT Condensed
Gill Sans MT Ext Condensed Bold
Gill Sans MT Italic
Gill Sans Ultra Bold
Gill Sans Ultra Bold Condensed
Gloucester MT Extra Condensed
Goudy Old Style
Goudy Old Style Bold
Goudy Old Style Italic
Goudy Stout
Haettenschweiler
Impact
Imprint MT Shadow
Kartika
Latha
Lucida Bright Demibold
Lucida Bright Demibold Italic
Lucida Bright Italic
Lucida Bright Regular
Lucida Console
Lucida Sans Demibold
Lucida Sans Demibold Italic
Lucida Sans Demibold Roman
Lucida Sans Italic
Lucida Sans Regular
Lucida Sans Typewriter Bold
Lucida Sans Typewriter Bold Oblique
Lucida Sans Typewriter Oblique
Lucida Sans Typewriter Regular
Lucida Sans Unicode
MS Outlook
MS Reference Sans Serif
MS Reference Specialty
MV Boli
Maiandra GD
Mangal
Marlett
Microsoft Sans Serif
Monospaced.bold
Monospaced.bolditalic
Monospaced.italic
Monospaced.plain
Monotype Corsiva
OCR A Extended
Palace Script MT
Palatino Linotype
Palatino Linotype Bold
Palatino Linotype Bold Italic
Palatino Linotype Italic
Papyrus
Perpetua
Perpetua Bold
Perpetua Bold Italic
Perpetua Italic
Perpetua Titling MT Bold
Perpetua Titling MT Light
Pristina
Raavi
Rage Italic
Rockwell
Rockwell Bold
Rockwell Bold Italic
Rockwell Condensed
Rockwell Condensed Bold
Rockwell Extra Bold
Rockwell Italic
SansSerif.bold
SansSerif.bolditalic
SansSerif.italic
SansSerif.plain
Script MT Bold
Serif.bold
Serif.bolditalic
Serif.italic
Serif.plain
Shruti
Sylfaen
Symbol
Tahoma
Tahoma Bold
Tera Special
Times New Roman
Times New Roman Bold
Times New Roman Bold Italic
Times New Roman Italic
Trebuchet MS
Trebuchet MS Bold
Trebuchet MS Bold Italic
Trebuchet MS Italic
Tunga
Tw Cen MT
Tw Cen MT Bold
Tw Cen MT Bold Italic
Tw Cen MT Condensed
Tw Cen MT Condensed Bold
Tw Cen MT Condensed Extra Bold
Tw Cen MT Italic
Verdana
Verdana Bold
Verdana Bold Italic
Verdana Italic
Vrinda
Webdings
Wingdings
Wingdings 2
Wingdings 3

To get the font names

   <source lang="java">

import java.awt.Font; import java.awt.GraphicsEnvironment; public class MainClass {

 public static void main(String[] a) {
   GraphicsEnvironment e = GraphicsEnvironment.getLocalGraphicsEnvironment();
   String[] fontnames = e.getAvailableFontFamilyNames();
   for (String s : fontnames) {
     System.out.println(s);
   }
 }

}</source>

Agency FB
Arial
Arial Black
Arial Narrow
Arial Rounded MT Bold
Arial-SM
Blackadder ITC
Bodoni MT
Bodoni MT Black
Bodoni MT Condensed
Book Antiqua
Bookman Old Style
Bookshelf Symbol 7
Bradley Hand ITC
Calisto MT
Castellar
Century Gothic
Century Schoolbook
Comic Sans MS
Copperplate Gothic Bold
Copperplate Gothic Light
Courier New
Curlz MT
Dialog
DialogInput
Edwardian Script ITC
Elephant
Engravers MT
Eras Bold ITC
Eras Demi ITC
Eras Light ITC
Eras Medium ITC
Estrangelo Edessa
Felix Titling
Forte
Franklin Gothic Book
Franklin Gothic Demi
Franklin Gothic Demi Cond
Franklin Gothic Heavy
Franklin Gothic Medium
Franklin Gothic Medium Cond
French Script MT
Garamond
Gautami
Georgia
Gigi
Gill Sans MT
Gill Sans MT Condensed
Gill Sans MT Ext Condensed Bold
Gill Sans Ultra Bold
Gill Sans Ultra Bold Condensed
Gloucester MT Extra Condensed
Goudy Old Style
Goudy Stout
Haettenschweiler
Impact
Imprint MT Shadow
Kartika
Latha
Lucida Bright
Lucida Console
Lucida Sans
Lucida Sans Typewriter
Lucida Sans Unicode
Maiandra GD
Mangal
Marlett
Microsoft Sans Serif
Monospaced
Monotype Corsiva
MS Outlook
MS Reference Sans Serif
MS Reference Specialty
MV Boli
OCR A Extended
Palace Script MT
Palatino Linotype
Papyrus
Perpetua
Perpetua Titling MT
Pristina
Raavi
Rage Italic
Rockwell
Rockwell Condensed
Rockwell Extra Bold
SansSerif
Script MT Bold
Serif
Shruti
Sylfaen
Symbol
Tahoma
Tera Special
Times New Roman
Trebuchet MS
Tunga
Tw Cen MT
Tw Cen MT Condensed
Tw Cen MT Condensed Extra Bold
Verdana
Vrinda
Webdings
Wingdings
Wingdings 2
Wingdings 3

Use fonts in paint

   <source lang="java">

import java.awt.Font; import java.awt.Graphics; import javax.swing.JComponent; import javax.swing.JFrame; class MyCanvas extends JComponent {

 public void paint(Graphics g) {
   Font courier = new Font ("Courier", Font.PLAIN, 12); 
   Font system = new Font ("System", Font.BOLD, 16); 
   Font helvetica = new Font ("Helvetica", Font.BOLD, 18);  
   g.setFont (courier);  
   g.drawString ("Courier", 10, 30); 
   g.setFont (system);  
   g.drawString ("System", 10, 70);  
   g.setFont (helvetica);  
   g.drawString ("Helvetica", 10, 90);  
 }

} public class SettingFont {

 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);
 }

}</source>

Using FontRenderContext

   <source lang="java">

import java.awt.BasicStroke; import java.awt.Color; import java.awt.Font; import java.awt.FontMetrics; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.RenderingHints; import java.awt.Shape; import java.awt.font.FontRenderContext; import java.awt.font.TextLayout; import java.awt.geom.AffineTransform; import javax.swing.JFrame; import javax.swing.JPanel; public class FontRenderContextRenderingHints extends JFrame {

 public FontRenderContextRenderingHints() {
   getContentPane().add(new DrawingCanvas());
   setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   setSize(500, 500);
   setVisible(true);
 }
 public static void main(String arg[]) {
   new FontRenderContextRenderingHints();
 }

} class DrawingCanvas extends JPanel {

 Font font = new Font("Dialog", Font.BOLD, 40);
 FontMetrics fontMetrics;
 DrawingCanvas() {
   setSize(300, 300);
   setBackground(Color.white);
   fontMetrics = getFontMetrics(font);
 }
 public void paint(Graphics g) {
   Graphics2D g2D = (Graphics2D) g;
   int w = getSize().width;
   int h = getSize().height;
   RenderingHints qualityHints = new RenderingHints(
       RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
   qualityHints.put(RenderingHints.KEY_RENDERING,
       RenderingHints.VALUE_RENDER_QUALITY);
   g2D.setRenderingHints(qualityHints);
   AffineTransform at = new AffineTransform();
   at.setToTranslation(-300, -400);
   at.shear(-0.5, 0.0);
   FontRenderContext frc = new FontRenderContext(at, false, false);
   TextLayout tl = new TextLayout("World!", font, frc);
   Shape outline = tl.getOutline(null);
   g2D.setColor(Color.blue);
   BasicStroke wideStroke = new BasicStroke(2.0f);
   g2D.setStroke(wideStroke);
   g2D.draw(outline);
 }

}</source>

Java Tutorial/2D Graphics

Содержание

calls stringWidth (String) to center several text messages

Center text.

Create Bold and Italic font

Create font from true type font

Creating Serif Font

Display a text in 3 dimensions

Display font in a grid

Display font info.

Draw font metrics

Draw text to the center

Draw text to the left

Draw text to the right

Font base line

Font Metrics: the wealth of dimensional data about a font

Fonts exercise: a font chooser

Getting Char with based on current font

java.awt.Font

Obtain FontMetrics of different fonts

Show all Fonts installed in your system

Show fonts with mouse click

System fonts display

Text justify

The Three Font Styles

To change the size and/or style of a font, you call its deriveFont() method

To get all available fonts in your system

To get the font names

Use fonts in paint

Using FontRenderContext

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