/* * @(#)Balls.java	1.17 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.Mix;import java.awt.*;import java.awt.image.*;import java.awt.event.*;import javax.swing.*;import AnimatingContext;import DemoSurface;import DemoPanel;import CustomControls;/** * Animated color bouncing balls with custom controls. */public class Balls extends DemoSurface implements AnimatingContext, CustomControls {    private static Color colors[] =             { Color.red, Color.orange, Color.yellow, Color.green.darker(),              Color.blue, new Color(75, 00, 82), new Color(238,130,238) };    private long now, deltaT, lasttime;    private boolean active;    private DemoControls controls;    protected Ball balls[] = new Ball[colors.length];    protected boolean clearToggle;    public Balls() {        setBackground(Color.white);        for (int i = 0; i < colors.length; i++) {            balls[i] = new Ball(colors[i], 30);        }        balls[0].isSelected = true;        balls[3].isSelected = true;        balls[4].isSelected = true;        balls[6].isSelected = true;        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) {        if (w > 400 && h > 100) {            controls.combo.setSelectedIndex(5);        }    }    public void step(int w, int h) {        if (lasttime == 0) {            lasttime = System.currentTimeMillis();        }        now = System.currentTimeMillis();        deltaT = now - lasttime;        active = false;        for (int i = 0; i < balls.length; i++) {            if (balls[i] == null) {                return;            }            balls[i].step(deltaT, w, h);            if (balls[i].Vy > .02 || -balls[i].Vy > .02 ||                    balls[i].y + balls[i].bsize < h) {                active = true;            }        }        if (!active) {            for (int i = 0; i < balls.length; i++) {                balls[i].Vx = (float)Math.random() / 4.0f - 0.125f;                balls[i].Vy = -(float)Math.random() / 4.0f - 0.2f;            }            clearToggle = true;        }    }    public void drawDemo(int w, int h, Graphics2D g2) {        for (int i = 0; i < balls.length; i++) {            Ball b = balls[i];            if (b == null || b.imgs[b.index] == null || !b.isSelected) {                continue;            }            g2.drawImage(b.imgs[b.index], (int) b.x, (int) b.y, this);        }        lasttime = now;    }    public static void main(String argv[]) {        final DemoPanel dp = new DemoPanel(new Balls());        JFrame f = new JFrame("Java2D Demo - Balls");        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();    }    static class Ball {            public int bsize;        public float x, y;        public float Vx = 0.1f;        public float Vy = 0.05f;        public int nImgs = 5;        public BufferedImage imgs[];        public int index = (int) (Math.random() * (nImgs-1));            private final float inelasticity = .96f;        private final float Ax = 0.0f;        private final float Ay = 0.0002f;        private final float Ar = 0.9f;        private final int UP = 0;        private final int DOWN = 1;        private int indexDirection = UP;        private boolean collision_x, collision_y;        private float jitter;        private Color color;        private boolean isSelected;                public Ball(Color color, int bsize) {            this.color = color;            makeImages(bsize);        }                public void makeImages(int bsize) {            this.bsize = bsize*2;            int R = bsize;            byte[] data = new byte[R * 2 * R * 2];            int maxr = 0;            for (int Y = 2 * R; --Y >= 0;) {                int x0 = (int) (Math.sqrt(R * R - (Y - R) * (Y - R)) + 0.5);                int p = Y * (R * 2) + R - x0;                for (int X = -x0; X < x0; X++) {                    int x = X + 15;                    int y = Y - R + 15;                    int r = (int) (Math.sqrt(x * x + y * y) + 0.5);                    if (r > maxr) {                        maxr = r;                    }                    data[p++] = r <= 0 ? 1 : (byte) r;                }            }                imgs = new BufferedImage[nImgs];                int bg = 255;            byte red[] = new byte[256];            red[0] = (byte) bg;            byte green[] = new byte[256];            green[0] = (byte) bg;            byte blue[] = new byte[256];            blue[0] = (byte) bg;                for (int r = 0; r < imgs.length; r++) {                float b = 0.5f + (float) ((r+1f)/imgs.length/2f);                for (int i = maxr; i >= 1; --i) {                    float d = (float) i / maxr;                    red[i] = (byte) blend(blend(color.getRed(), 255, d), bg, b);                    green[i] = (byte) blend(blend(color.getGreen(), 255, d), bg, b);                    blue[i] = (byte) blend(blend(color.getBlue(), 255, d), bg, b);                }                IndexColorModel icm = new IndexColorModel(8, maxr + 1,                            red, green, blue, 0);                DataBufferByte dbb = new DataBufferByte(data, data.length);                int bandOffsets[] = {0};                WritableRaster wr = Raster.createInterleavedRaster(dbb,                    R*2,R*2,R*2,1, bandOffsets,null);                imgs[r] = new BufferedImage(icm, wr,icm.isAlphaPremultiplied(),null);            }        }                private final int blend(int fg, int bg, float fgfactor) {            return (int) (bg + (fg - bg) * fgfactor);        }                public void step(long deltaT, int w, int h) {            collision_x = false;            collision_y = false;                jitter = (float) Math.random() * .01f - .005f;                x += Vx * deltaT + (Ax / 2.0) * deltaT * deltaT;            y += Vy * deltaT + (Ay / 2.0) * deltaT * deltaT;            if (x <= 0.0f) {                x = 0.0f;                Vx = -Vx * inelasticity + jitter;                collision_x = true;            }            if (x + bsize >= w) {                x = w - bsize;                Vx = -Vx * inelasticity + jitter;                collision_x = true;            }            if (y <= 0) {                y = 0;                Vy = -Vy * inelasticity + jitter;                collision_y = true;            }            if (y + bsize >= h) {                y = h - bsize;                Vx *= inelasticity;                Vy = -Vy * inelasticity + jitter;                collision_y = true;            }            Vy = Vy + Ay * deltaT;            Vx = Vx + Ax * deltaT;                if (indexDirection == UP) {                index++;             }            if (indexDirection == DOWN) {                --index;             }            if (index+1 == nImgs) {                indexDirection = DOWN;            }            if (index == 0) {                indexDirection = UP;            }        }    }  // End class Ball    static class DemoControls extends JPanel implements ActionListener, Runnable {        Balls demo;        JToolBar toolbar;        JComboBox combo;        Thread thread;        public DemoControls(Balls demo) {            this.demo = demo;            setBackground(Color.gray);            add(toolbar = new JToolBar());            toolbar.setFloatable(false);            addTool("Clear", true);            addTool("R", demo.balls[0].isSelected);            addTool("O", demo.balls[1].isSelected);            addTool("Y", demo.balls[2].isSelected);            addTool("G", demo.balls[3].isSelected);            addTool("B", demo.balls[4].isSelected);            addTool("I", demo.balls[5].isSelected);            addTool("V", demo.balls[6].isSelected);            add(combo = new JComboBox());            combo.addItem("10");            combo.addItem("20");            combo.addItem("30");            combo.addItem("40");            combo.addItem("50");            combo.addItem("60");            combo.addItem("70");            combo.addItem("80");            combo.setSelectedIndex(2);            combo.addActionListener(this);            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) {            if (e.getSource() instanceof JComboBox) {                int size = Integer.parseInt((String) combo.getSelectedItem());                for (int i = 0; i < demo.balls.length; i++) {                    demo.balls[i].makeImages(size);                }                return;            }            JButton b = (JButton) e.getSource();            b.setSelected(!b.isSelected());            b.setBackground(b.isSelected() ? Color.green : Color.lightGray);            if (b.getText().equals("Clear")) {                demo.clearSurface = b.isSelected();            } else {                int index = toolbar.getComponentIndex(b)-1;                demo.balls[index].isSelected = b.isSelected();            }        }        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("Mix.Balls DemoControls Thread");            thread.start();        }        public synchronized void stop() {            if (thread != null) {                thread.interrupt();            }            thread = null;            notifyAll();        }        public void run() {            try { thread.sleep(999); } catch (Exception e) { return; }            Thread me = Thread.currentThread();            ((JButton) toolbar.getComponentAtIndex(2)).doClick();            while (thread == me) {                try {                    thread.sleep(222);                } catch (InterruptedException e) { return; }                if (demo.clearToggle) {                    if (demo.clearSurface) {                        combo.setSelectedIndex((int) (Math.random()*5));                    }                    ((JButton) toolbar.getComponentAtIndex(0)).doClick();                    demo.clearToggle = false;                }            }            thread = null;        }    } // End DemoControls} // End Balls