Java Tutorial/2D Graphics/LineBreakMeasurer

Drawing multi-line text

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);
  }
}

LineBreakMeasurer Demo

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);
  }
}