Areas support the following boolean operations: Union, Subtraction, Intersection, Exclusive-or (XOR) : Area « 2D Graphics « Java Tutorial






Areas support the following boolean operations: Union, Subtraction, Intersection, Exclusive-or (XOR)
/*
 *
 * Copyright (c) 1998 Sun Microsystems, Inc. All Rights Reserved.
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import java.awt.Color;
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.geom.Area;
import java.awt.geom.Ellipse2D;

import javax.swing.JApplet;
import javax.swing.JFrame;

public class Pear extends JApplet {

  Ellipse2D.Double circle, oval, leaf, stem;

  Area circ, ov, leaf1, leaf2, st1, st2;

  public void init() {
    circle = new Ellipse2D.Double();
    oval = new Ellipse2D.Double();
    leaf = new Ellipse2D.Double();
    stem = new Ellipse2D.Double();
    circ = new Area(circle);
    ov = new Area(oval);
    leaf1 = new Area(leaf);
    leaf2 = new Area(leaf);
    st1 = new Area(stem);
    st2 = new Area(stem);

    setBackground(Color.white);
  }

  public void paint(Graphics g) {
    Graphics2D g2 = (Graphics2D) g;
    Dimension d = getSize();
    int w = d.width;
    int h = d.height;
    double ew = w / 2;
    double eh = h / 2;

    g2.setColor(Color.green);

    // Creates the first leaf by filling the intersection of two Area objects
    // created from an ellipse.
    leaf.setFrame(ew - 16, eh - 29, 15.0, 15.0);
    leaf1 = new Area(leaf);
    leaf.setFrame(ew - 14, eh - 47, 30.0, 30.0);
    leaf2 = new Area(leaf);
    leaf1.intersect(leaf2);
    g2.fill(leaf1);

    // Creates the second leaf.
    leaf.setFrame(ew + 1, eh - 29, 15.0, 15.0);
    leaf1 = new Area(leaf);
    leaf2.intersect(leaf1);
    g2.fill(leaf2);

    g2.setColor(Color.black);

    // Creates the stem by filling the Area resulting from the subtraction of
    // two Area objects created from an ellipse.
    stem.setFrame(ew, eh - 42, 40.0, 40.0);
    st1 = new Area(stem);
    stem.setFrame(ew + 3, eh - 47, 50.0, 50.0);
    st2 = new Area(stem);
    st1.subtract(st2);
    g2.fill(st1);

    g2.setColor(Color.yellow);

    // Creates the pear itself by filling the Area resulting from the union of
    // two Area objects created by two different ellipses.
    circle.setFrame(ew - 25, eh, 50.0, 50.0);
    oval.setFrame(ew - 19, eh - 20, 40.0, 70.0);
    circ = new Area(circle);
    ov = new Area(oval);
    circ.add(ov);
    g2.fill(circ);
  }

  public static void main(String s[]) {
    JFrame f = new JFrame("Pear");
    f.addWindowListener(new WindowAdapter() {
      public void windowClosing(WindowEvent e) {
        System.exit(0);
      }
    });
    JApplet applet = new Pear();
    f.getContentPane().add("Center", applet);
    applet.init();
    f.pack();
    f.setSize(new Dimension(150, 200));
    f.show();
  }

}








16.38.Area
16.38.1.Areas support the following boolean operations: Union, Subtraction, Intersection, Exclusive-or (XOR)Areas support the following boolean operations: Union, Subtraction, Intersection, Exclusive-or (XOR)
16.38.2.Area.addArea.add
16.38.3.Area.SubtractArea.Subtract
16.38.4.Area.intersectArea.intersect
16.38.5.Area.exclusiveOrArea.exclusiveOr