LineBreakMeasurerDemo.java Source code

Introduction

Here is the source code for LineBreakMeasurerDemo.java

Source

import java.awt.Color;
import java.awt.Dimension;
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.JPanel;

public class LineBreakMeasurerDemo {
    public static void main(String arg[]) {
        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.getContentPane().add("Center", new DisplayPanel());
        frame.pack();
        frame.setSize(new Dimension(350, 400));
        frame.setVisible(true);
    }
}

class DisplayPanel extends JPanel {
    String text = "This is a test. This is a test. This is a test.";
    AttributedString attribString;
    AttributedCharacterIterator attribCharIterator;

    public DisplayPanel() {
        setBackground(Color.white);
        setSize(350, 400);
        attribString = new AttributedString(text);
        attribString.addAttribute(TextAttribute.FOREGROUND, Color.blue, 0, text.length());
        Font font = new Font("sanserif", Font.ITALIC, 20);
        attribString.addAttribute(TextAttribute.FONT, font, 0, text.length());
    }

    public void paintComponent(Graphics g) {
        super.paintComponent(g);
        Graphics2D g2 = (Graphics2D) g;
        attribCharIterator = attribString.getIterator();
        FontRenderContext frc = new FontRenderContext(null, false, false);
        LineBreakMeasurer lbm = new LineBreakMeasurer(attribCharIterator, frc);
        int x = 10, y = 20;
        int w = getWidth();
        float wrappingWidth = w - 15;

        while (lbm.getPosition() < text.length()) {
            TextLayout layout = lbm.nextLayout(wrappingWidth);
            y += layout.getAscent();
            layout.draw(g2, x, y);
            y += layout.getDescent() + layout.getLeading();
        }
    }
}