Mega Code Archive
Line break for textlayout
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import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
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 java.util.Hashtable;
import javax.swing.JApplet;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class LineBreakSample extends JPanel {
private LineBreakMeasurer lineMeasurer;
// the first character in the paragraph.
private int paragraphStart;
// the first character after the end of the paragraph.
private int paragraphEnd;
private static final Hashtable map = new Hashtable();
static {
map.put(TextAttribute.SIZE, new Float(18.0));
}
private static AttributedString vanGogh = new AttributedString(
"Many people believe that Vincent van Gogh painted his best works "
+ "during the two-year period he spent in Provence. Here is where he "
+ "painted The Starry Night--which some consider to be his greatest "
+ "work of all. However, as his artistic brilliance reached new heights "
+ "in Provence, his physical and mental health plummeted. ",
map);
public LineBreakSample() {
AttributedCharacterIterator paragraph = vanGogh.getIterator();
paragraphStart = paragraph.getBeginIndex();
paragraphEnd = paragraph.getEndIndex();
// Create a new LineBreakMeasurer from the paragraph.
lineMeasurer = new LineBreakMeasurer(paragraph,
new FontRenderContext(null, false, false));
}
public void paintComponent(Graphics g) {
super.paintComponent(g);
setBackground(Color.white);
Graphics2D graphics2D = (Graphics2D) g;
// Set formatting width to width of Component.
Dimension size = getSize();
float formatWidth = (float) size.width;
float drawPosY = 0;
lineMeasurer.setPosition(paragraphStart);
// Get lines from lineMeasurer until the entire
// paragraph has been displayed.
while (lineMeasurer.getPosition() < paragraphEnd) {
// Retrieve next layout.
TextLayout layout = lineMeasurer.nextLayout(formatWidth);
// Move y-coordinate by the ascent of the layout.
drawPosY += layout.getAscent();
// Compute pen x position. If the paragraph is
// right-to-left, we want to align the TextLayouts
// to the right edge of the panel.
float drawPosX;
if (layout.isLeftToRight()) {
drawPosX = 0;
} else {
drawPosX = formatWidth - layout.getAdvance();
}
// Draw the TextLayout at (drawPosX, drawPosY).
layout.draw(graphics2D, drawPosX, drawPosY);
// Move y-coordinate in preparation for next layout.
drawPosY += layout.getDescent() + layout.getLeading();
}
}
public static void main(String[] args) {
JFrame f = new JFrame("");
f.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
LineBreakSample controller = new LineBreakSample();
f.getContentPane().add(controller,"Center");
f.setSize(new Dimension(400, 250));
f.setVisible(true);
}
}
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