cagdemo.java

来自「java 完全探索的随书源码」· Java 代码 · 共 80 行

// CAGDemo.html

import java.awt.*;
import java.awt.geom.*;

public class CAGDemo extends java.applet.Applet
{
   public void paint (Graphics g)
   {
      Graphics2D g2 = (Graphics2D) g;

      Ellipse2D e1 = new Ellipse2D.Double (20.0, 20.0, 80.0, 70.0);

      g2.setColor (Color.red);
      g2.fill (e1);

      Ellipse2D e2 = new Ellipse2D.Double (20.0, 70.0, 40.0, 40.0);

      g2.setColor (Color.blue);
      g2.fill (e2);

      g2.setColor (Color.black);
      g2.drawString ("Original", 20, 140);

      g2.translate (110.0, 0.0);

      // Perform union.

      Area a1 = new Area (e1);
      Area a2 = new Area (e2);

      a1.add (a2);

      g2.setColor (Color.orange);
      g2.fill (a1);

      g2.setColor (Color.black);
      g2.drawString ("Union", 20, 140);

      g2.translate (110.0, 0.0);

      // Perform intersection.

      a1 = new Area (e1);
      a1.intersect (a2);

      g2.setColor (Color.magenta);
      g2.fill (a1);

      g2.setColor (Color.black);
      g2.drawString ("Intersection", 20, 140);

      g2.translate (110.0, 0.0);

      // Perform subtraction.

      a1 = new Area (e1);
      a1.subtract (a2);

      g2.setColor (Color.gray);
      g2.fill (a1);

      g2.setColor (Color.black);
      g2.drawString ("Subtraction", 20, 140);

      g2.translate (110.0, 0.0);

      // Perform exclusive or.

      a1 = new Area (e1);
      a1.exclusiveOr (a2);

      g2.setColor (Color.green);
      g2.fill (a1);

      g2.setColor (Color.black);
      g2.drawString ("Exclusive Or", 20, 140);
   }
}