clipshapefrm.java

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package clipshape;

import java.awt.*;
import java.awt.event.*;
import java.awt.font.*;
import java.awt.geom.*;
import java.util.*;
import javax.swing.*;

/**
 * <p>Title: ClipShape</p>
 * <p>Description: 应用Java 2D API剪切文字图形</p>
 * <p>Copyright: Copyright (c) 2004</p>
 * <p>Company: 北京师范大学计算机系</p>
 * @author 张良博
 * @version 1.0
 */

class ClipShapeFrm extends JFrame{

  private JPanel panel;
  private Shape clipShape;
  private static final int WIDTH = 300;
  private static final int HEIGHT = 300;


  public ClipShapeFrm() {
    enableEvents(AWTEvent.WINDOW_EVENT_MASK);
    try {
      jbInit();
    }
    catch(Exception e) {
      e.printStackTrace();
    }
  }
  //Component initialization
  private void jbInit() throws Exception  {
    //setIconImage(Toolkit.getDefaultToolkit().createImage(TransformFrm.class.getResource("[Your Icon]")));
    setTitle("应用Java 2D API实现剪切文字图形");
    setSize(WIDTH, HEIGHT);
    Container contentPane = getContentPane();
    final JCheckBox checkBox = new JCheckBox("Clip");
    checkBox.addActionListener(new ActionListener(){
      public void actionPerformed(ActionEvent event){
        panel.repaint();
      }
    });
    contentPane.add(checkBox, BorderLayout.NORTH);
    panel = new JPanel() {
      public void paintComponent(Graphics g) {
        super.paintComponent(g);
        Graphics2D g2 = (Graphics2D)g;
        if (clipShape == null)
          clipShape = makeClipShape(g2);
        g2.draw(clipShape);
        if (checkBox.isSelected())
          g2.clip(clipShape);
        final int NLINES =50;
        Point2D p = new Point2D.Double(0, 0);
        for (int i = 0; i < NLINES; i++) {
          double x = (2 * getWidth() * i) / NLINES;
          double y = (2 * getHeight() * (NLINES - 1 - i)) / NLINES;
          Point2D q = new Point2D.Double(x, y);
          g2.draw(new Line2D.Double(p, q));//设置剪切的形状，并且绘制一组线条。
        }
      }
    };
    contentPane.add(panel, BorderLayout.CENTER);
  }

  Shape makeClipShape(Graphics2D g2) {
    FontRenderContext context = g2.getFontRenderContext();//取得一个字体绘制环境
    Font f = new Font("Serif", Font.PLAIN, 100);
    GeneralPath clipShape = new GeneralPath();//将字体的外形附加给剪切的形状
    TextLayout layout = new TextLayout("Hello", f, context);//建立一个TextLayout对象
    AffineTransform transform = AffineTransform.getTranslateInstance(0, 100);//将基点移到点（0，100）的变换操作
    Shape outline = layout.getOutline(transform);
    clipShape.append(outline, false);
    layout = new TextLayout("Java", f, context);
    transform = AffineTransform.getTranslateInstance(0, 200);
    outline = layout.getOutline(transform);
    clipShape.append(outline, false);
    return clipShape;
  }
   protected void processWindowEvent(WindowEvent e) {
    super.processWindowEvent(e);
    if (e.getID() == WindowEvent.WINDOW_CLOSING) {
      System.exit(0);
    }
  }
}