import java.awt.Component;
import java.awt.Container;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Point;
import java.awt.font.FontRenderContext;
import java.awt.font.LineBreakMeasurer;
import java.awt.font.TextAttribute;
import java.awt.font.TextLayout;
import java.text.AttributedString;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import javax.swing.JFrame;
/** A display of text, formatted by us instead of by AWT/Swing.
* <P>
* This program is distributed under the terms of the accompanying
* COPYRIGHT.txt file (which is NOT the GNU General Public License).
* Please read it. Your use of the software constitutes acceptance
* of the terms in the COPYRIGHT.txt file.
* @author Ian F. Darwin
* @version $Id: TextFormat.java,v 1.3 2004/03/26 03:34:30 ian Exp $
*/
public class TextFormat extends Component {
/** The text of this line */
protected String text;
/** The Font */
protected Font font;
/** The TextLayouts corresponding to "text" */
List layouts;
public Font getFont() {
return font;
}
public void setFont(Font f) {
font = f;
}
public String getText() {
return text;
}
public void setText(String t) {
text = t;
}
public void paint(Graphics g) {
if (text == null || text.length() == 0)
return;
if (layouts == null)
getLayouts(g);
Point pen = new Point(0, 0);
Graphics2D g2d = (Graphics2D)g;
g2d.setColor(java.awt.Color.black); // or a property
g2d.setFont(font);
Iterator it = layouts.iterator();
while (it.hasNext()) {
TextLayout layout = (TextLayout) it.next();
pen.y += (layout.getAscent());
g2d.setFont(font);
layout.draw(g2d, pen.x, pen.y);
pen.y += layout.getDescent();
//pen.y += leading;
}
}
/** Lazy evaluation of the List of TextLayout objects corresponding
* to this MText. Some things are approximations!
*/
private void getLayouts(Graphics g) {
layouts = new ArrayList();
Point pen = new Point(10, 20);
Graphics2D g2d = (Graphics2D) g;
FontRenderContext frc = g2d.getFontRenderContext();
AttributedString attrStr = new AttributedString(text);
attrStr.addAttribute(TextAttribute.FONT, font, 0, text.length());
LineBreakMeasurer measurer = new LineBreakMeasurer(
attrStr.getIterator(), frc);
float wrappingWidth;
wrappingWidth = getSize().width - 15;
while (measurer.getPosition() < text.length()) {
TextLayout layout = measurer.nextLayout(wrappingWidth);
layouts.add(layout);
}
}
public static void main(String[] args) {
JFrame jf = new JFrame("Demo");
Container cp = jf.getContentPane();
TextFormat tl = new TextFormat();
tl.setFont(new Font("SansSerif", Font.BOLD, 42));
tl.setText("The quick brown fox jumped over the lazy cow");
cp.add(tl);
jf.setSize(300, 200);
jf.setVisible(true);
}
}
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