Draw a pear, using Constructive Area Geometry (CSG) methods, add, intersect, and subtract in Java 2D - Java 2D Graphics

Java examples for 2D Graphics:Area

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Description

Draw a pear, using Constructive Area Geometry (CSG) methods, add, intersect, and subtract in Java 2D

Demo Code

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

/*//from   w  ww .j a v  a  2s.c o m
 * This applet renders a pear, using Constructive Area Geometry (CSG) methods,
 * add, intersect, and subtract.
 */

public class Pear extends Applet {

    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");
        Applet applet = new Pear();

        f.addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });
        f.getContentPane().add("Center", applet);
        applet.init();
        f.pack();
        f.setSize(new Dimension(150, 200));
        f.setVisible(true);
    }

}

/*
 * Copyright (c) 1995, 2008, Oracle and/or its affiliates. All rights reserved.
 *
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 * modification, are permitted provided that the following conditions
 * are met:
 *
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 *     notice, this list of conditions and the following disclaimer.
 *
 *   - Redistributions in binary form must reproduce the above copyright
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 *     documentation and/or other materials provided with the distribution.
 *
 *   - Neither the name of Oracle or the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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