clipanim.java

java2d的源码分析

/*
 * @(#)ClipAnim.java	1.16 99/04/23
 *
 * Copyright (c) 1998, 1999 by Sun Microsystems, Inc. All Rights Reserved.
 * 
 * Sun grants you ("Licensee") a non-exclusive, royalty free, license to use,
 * modify and redistribute this software in source and binary code form,
 * provided that i) this copyright notice and license appear on all copies of
 * the software; and ii) Licensee does not utilize the software in a manner
 * which is disparaging to Sun.
 * 
 * This software is provided "AS IS," without a warranty of any kind. ALL
 * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING ANY
 * IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR
 * NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN AND ITS LICENSORS SHALL NOT BE
 * LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING
 * OR DISTRIBUTING THE SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR ITS
 * LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT,
 * INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER
 * CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF
 * OR INABILITY TO USE SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGES.
 * 
 * This software is not designed or intended for use in on-line control of
 * aircraft, air traffic, aircraft navigation or aircraft communications; or in
 * the design, construction, operation or maintenance of any nuclear
 * facility. Licensee represents and warrants that it will not use or
 * redistribute the Software for such purposes.
 */

package demos.Clipping;

import java.awt.*;
import java.awt.geom.*;
import java.awt.image.BufferedImage;
import java.awt.event.*;
import javax.swing.*;
import AnimatingContext;
import DemoSurface;
import DemoPanel;
import CustomControls;


/**
 * Animated clipping of an image & composited shapes.
 */
public class ClipAnim extends DemoSurface implements AnimatingContext, CustomControls {

    private static Image dimg, cimg;
    private static Color redBlend = new Color(255, 0, 0, 120);
    private static Color greenBlend = new Color(0, 255, 0, 120);
    private static BasicStroke bs = new BasicStroke(20.0f);
    static TexturePaint texture;
    static {
        BufferedImage bi = new BufferedImage(5, 5, BufferedImage.TYPE_INT_RGB);
        Graphics2D big = bi.createGraphics();
        big.setBackground(Color.yellow);
        big.clearRect(0,0,5,5);
        big.setColor(Color.red);
        big.fillRect(0,0,3,3);
        texture = new TexturePaint(bi,new Rectangle(0,0,5,5));
    }
    private AnimVal animval[] = new AnimVal[3]; 
    protected boolean doObjects = true;
    private Font originalFont = new Font("serif", Font.PLAIN, 12);
    private Font font;
    private GradientPaint gradient;
    private int strX, strY;
    private int dukeX, dukeY;
    private DemoControls controls;


    public ClipAnim() {
        cimg = getImage("clouds.jpg");
        dimg = getImage("duke.gif");
        setBackground(Color.white);
        animval[0] = new AnimVal(true);
        animval[1] = new AnimVal(false);
        animval[2] = new AnimVal(false);
        controls = new DemoControls(this);
    }


    public String[] getCustomControlsConstraints() {
        return new String[] { BorderLayout.NORTH };
    }


    public Component[] getCustomControls() {
        return new Component[] { (Component) controls };
    }


    public void customControlsThread(int state) {
        if (state == CustomControls.START) {
            controls.start();
        } else if (state == CustomControls.STOP) {
            controls.stop();
        }
    }


    public void reset(int w, int h) {
        for (int i = 0; i < animval.length; i++) {
            animval[i].reset(w, h);
        }
        gradient = new GradientPaint(0,h/2,Color.red,w*.4f,h*.9f,Color.yellow);
        dukeX = (int) (w*.25-dimg.getWidth(this)/2);
        dukeY = (int) (h*.25-dimg.getHeight(this)/2);
        FontMetrics fm = getFontMetrics(originalFont);
        double sw = fm.stringWidth("CLIPPING");
        double sh = fm.getAscent()+fm.getDescent();
        double sx = (w/2-30)/sw;
        double sy = (h/2-30)/sh;
        AffineTransform Tx = AffineTransform.getScaleInstance(sx, sy);
        font = originalFont.deriveFont(Tx);
        fm = getFontMetrics(font);
        strX = (int) (w*.75 - fm.stringWidth("CLIPPING")/2);
        strY = (int) (h*.72 + fm.getAscent()/2);
    }


    public void step(int w, int h) {
        for (int i = 0; i < animval.length; i++) {
            if (animval[i].isSelected) {
                animval[i].step(w, h);
            }
        }
    }


    public void drawDemo(int w, int h, Graphics2D g2) {

        GeneralPath p1 = new GeneralPath();
        GeneralPath p2 = new GeneralPath();

        for (int i = 0; i < animval.length; i++) {
            if (animval[i].isSelected) {
                double x = animval[i].x; double y = animval[i].y;
                double ew = animval[i].ew; double eh = animval[i].eh;
                p1.append(new Ellipse2D.Double(x, y, ew, eh), false);
                p2.append(new Rectangle2D.Double(x+5, y+5, ew-10, eh-10),false);
            }
        }
        if (animval[0].isSelected || animval[1].isSelected || 
            animval[2].isSelected) 
        {
            g2.setClip(p1);
            g2.clip(p2);
        }

        if (doObjects) {
            int w2 = w/2;
            int h2 = h/2;
            g2.drawImage(cimg, 0, 0, w2, h2, null);
            g2.drawImage(dimg, dukeX, dukeY, null);

            g2.setPaint(texture);
            g2.fillRect(w2, 0, w2, h2);

            g2.setPaint(gradient);
            g2.fillRect(0, h2, w2, h2);

            g2.setColor(Color.lightGray);
            g2.fillRect(w2, h2, w2, h2);
            g2.setColor(Color.red);
            g2.drawOval(w2, h2, w2-1, h2-1);
            g2.setFont(font);
            g2.drawString("CLIPPING", strX, strY);
        } else {
            g2.setColor(Color.lightGray);
            g2.fillRect(0, 0, w, h);
        }
    }


    public static void main(String argv[]) {
        final DemoPanel dp = new DemoPanel(new ClipAnim());
        JFrame f = new JFrame("Java2D Demo - ClipAnim");
        f.addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {System.exit(0);}
            public void windowDeiconified(WindowEvent e) { 
                dp.surface.start(); 
            }
            public void windowIconified(WindowEvent e) { 
                dp.surface.stop(); 
            }
        });
        f.getContentPane().add("Center", dp);
        f.pack();
        f.setSize(new Dimension(400,300));
        f.show();
        dp.surface.start();
    }


    public class AnimVal {
        double ix = 5.0;
        double iy = 3.0;
        double iw = 5.0;
        double ih = 3.0;
        double x, y;
        double ew, eh;   // ellipse width & height
        boolean isSelected;

        public AnimVal(boolean isSelected) {
            this.isSelected = isSelected;
        }


        public void step(int w, int h) {
            x += ix;
            y += iy;
            ew += iw;
            eh += ih;
            if (ew > w/2) {
                ew = w/2;
                iw = Math.random() * -w/16 - 1;
            }
            if (ew < w/8) {
                ew = w/8;
                iw = Math.random() * w/16 + 1;
            }
            if (eh > h/2) {
                eh = h/2;
                ih = Math.random() * -h/16 - 1;
            }
            if (eh < h/8) {
                eh = h/8;
                ih = Math.random() * h/16 + 1;
            }
            if ((x+ew) > w) {
                x = (w - ew)-1;
                ix = Math.random() * -w/32 - 1;
            }
            if (x < 0) {
                x = 2;
                ix = Math.random() * w/32 + 1;
            }
            if ((y+eh) > h) {
                y = (h - eh)-2;
                iy = Math.random() * -h/32 - 1;
            }
            if (y < 0) {
                y = 2;
                iy = Math.random() * h/32 + 1;
            }
        }


        public void reset(int w, int h) {
            x = Math.random()*w;
            y = Math.random()*h;
            ew = (Math.random()*w)/2;
            eh = (Math.random()*h)/2;
        }
    }


    static class DemoControls extends JPanel implements ActionListener, Runnable {

        ClipAnim demo;
        JToolBar toolbar;
        Thread thread;

        public DemoControls(ClipAnim demo) {
            this.demo = demo;
            setBackground(Color.gray);
            add(toolbar = new JToolBar());
            toolbar.setFloatable(false);
            addTool("Objects", true);
            addTool("Clip1", true);
            addTool("Clip2", false);
            addTool("Clip3", false);
            addMouseListener(new MouseAdapter() {
                public void mouseClicked(MouseEvent e) {
                    if (thread == null) start(); else stop();
                }
            });
        }


        public void addTool(String str, boolean state) {
            JButton b = (JButton) toolbar.add(new JButton(str));
            b.setBackground(state ? Color.green : Color.lightGray);
            b.setSelected(state);
            b.addActionListener(this);
        }


        public void actionPerformed(ActionEvent e) {
            JButton b = (JButton) e.getSource();
            b.setSelected(!b.isSelected());
            b.setBackground(b.isSelected() ? Color.green : Color.lightGray);
            if (b.getText().equals("Objects")) {
                demo.doObjects = b.isSelected();
            } else if (b.getText().equals("Clip1")) {
                demo.animval[0].isSelected = b.isSelected();
            } else if (b.getText().equals("Clip2")) {
                demo.animval[1].isSelected = b.isSelected();
            } else if (b.getText().equals("Clip3")) {
                demo.animval[2].isSelected = b.isSelected();
            }
            if (demo.thread == null) {
                demo.repaint();
            }
        }

        public Dimension getPreferredSize() {
            return new Dimension(200,37);
        }


        public void start() {
            if (thread != null) {
                return;
            }
            thread = new Thread(this);
            thread.setPriority(Thread.MIN_PRIORITY);
            thread.setName("Clipping.ClipAnim DemoControls Thread");
            thread.start();
        }


        public synchronized void stop() {
            if (thread != null) {
                thread.interrupt();
            }
            thread = null;
            notifyAll();
        }


        public void run() {
            try { 
                thread.sleep(5000);
            } catch (InterruptedException e) { return; }
            ((JButton) toolbar.getComponentAtIndex(2)).doClick();
            try { 
                thread.sleep(5000);
            } catch (InterruptedException e) { return; }
            if (getSize().width > 400) {
                ((JButton) toolbar.getComponentAtIndex(3)).doClick();
            }
            thread = null;
        }
    } // End DemoControls
} // End ClipAnim