Java Tutorial/2D Graphics/LineBreakMeasurer

Drawing multi-line text

   <source lang="java">

import java.awt.Color; import java.awt.Font; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.font.FontRenderContext; import java.awt.font.LineBreakMeasurer; import java.awt.font.TextAttribute; import java.awt.font.TextLayout; import java.text.AttributedCharacterIterator; import java.text.AttributedString; import javax.swing.JFrame; import javax.swing.UIManager; public class Main extends JFrame {

 public void paint(Graphics g) {
   String input = "this is a test.this is a test.this is a test.this is a test.";
   AttributedString attributedString = new AttributedString(input);
   attributedString.addAttribute(TextAttribute.FONT, (Font) UIManager
       .get("Label.font"));
   Color color = (Color) UIManager.get("Label.foreground");
   attributedString.addAttribute(TextAttribute.FOREGROUND, color);
   super.paint(g);
   Graphics2D g2d = (Graphics2D) g;
   int width = getSize().width;
   int x = 10;
   int y = 30;
   AttributedCharacterIterator characterIterator = attributedString
       .getIterator();
   FontRenderContext fontRenderContext = g2d.getFontRenderContext();
   LineBreakMeasurer measurer = new LineBreakMeasurer(characterIterator,
       fontRenderContext);
   while (measurer.getPosition() < characterIterator.getEndIndex()) {
     TextLayout textLayout = measurer.nextLayout(width);
     y += textLayout.getAscent();
     textLayout.draw(g2d, x, y);
     y += textLayout.getDescent() + textLayout.getLeading();
   }
 }
 public static void main(String args[]) {
   JFrame frame = new Main();
   frame.setDefaultCloseOperation(EXIT_ON_CLOSE);
   frame.setSize(20, 200);
   frame.setVisible(true);
 }

}</source>

LineBreakMeasurer Demo

   <source lang="java">

import java.awt.Font; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.GraphicsEnvironment; import java.awt.Insets; import java.awt.font.FontRenderContext; import java.awt.font.LineBreakMeasurer; import java.awt.font.TextAttribute; import java.awt.font.TextLayout; import java.text.AttributedCharacterIterator; import java.text.AttributedString; import javax.swing.JFrame; public class TextLayoutLineBreakerMeasurer extends JFrame {

 String m = "\u05E9\u05DC\u05D5\u05DD \u05E2\u05D5\u05DC\u05DD";
 public void paint(Graphics g) {
   Graphics2D graphics2D = (Graphics2D) g;
   GraphicsEnvironment.getLocalGraphicsEnvironment();
   Font font = new Font("LucidaSans", Font.PLAIN, 14);
   AttributedString messageAS = new AttributedString(m);
   messageAS.addAttribute(TextAttribute.FONT, font);
   AttributedCharacterIterator messageIterator = messageAS.getIterator();
   FontRenderContext messageFRC = graphics2D.getFontRenderContext();
   LineBreakMeasurer messageLBM = new LineBreakMeasurer(messageIterator,
       messageFRC);
   Insets insets = getInsets();
   float wrappingWidth = getSize().width - insets.left - insets.right;
   float x = insets.left;
   float y = insets.top;
   while (messageLBM.getPosition() < messageIterator.getEndIndex()) {
     TextLayout textLayout = messageLBM.nextLayout(wrappingWidth);
     y += textLayout.getAscent();
     textLayout.draw(graphics2D, x, y);
     y += textLayout.getDescent() + textLayout.getLeading();
     x = insets.left;
   }
 }
 public static void main(String[] args) {
   JFrame frame = new TextLayoutLineBreakerMeasurer();
   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  
   frame.setSize(200,200);
   frame.setVisible(true);
 }

}</source>