/* * * Copyright (c) 2007, Sun Microsystems, Inc. * * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * *  * Redistributions of source code must retain the above copyright *    notice, this list of conditions and the following disclaimer. *  * Redistributions in binary form must reproduce the above copyright *    notice, this list of conditions and the following disclaimer in the *    documentation and/or other materials provided with the distribution. *  * Neither the name of Sun Microsystems nor 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, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */package example.audiodemo;import javax.microedition.lcdui.*;import javax.microedition.media.control.*;/** * A SmallBall is a lightweight animated ball that runs in its own thread. * It moves within a rectangular region, bouncing off the walls. */class SmallBall implements Runnable {    // random number generator    static java.util.Random random = new java.util.Random();    // Global flag to temporarily pause all balls    public static boolean paused = false;    private static final int DEFAULT_DELAY = 80;    private static final int MIN_DELAY = 40;    private static final int MAX_DELAY = 320;    private static final int DELAY_INCREMENT = 40;    private static final int POS_MULTIPLIER = 3;        // controls the speed of all balls; delay in milliseconds    static int delay = DEFAULT_DELAY;    // the matrix to transform the direction based on the    // current direction and which wall was hit    static int[][] matrix =        {            { 1, -1, -1, 1, 1, 1 },            { -1, -1, 1, 1, -1, 1 },            null,            { 1, 1, -1, -1, 1, -1 },            { -1, 1, 1, -1, -1, -1 }        };    // the region in which the ball moves    int top, left, width, height;    // the position and radius of the ball    int posX, posY;    int radius = 5;    int ballSize = radius * 2;    // the direction of the ball is controlled by these two variables    int deltaX, deltaY;    // a handle onto the singleton Graphics object    Graphics g;    Canvas canvas;    int note = ToneControl.C4;    int clr = 0;    // public variables to control the behaviour of the thread    public boolean stop; // = false    // if true, this thread will call repaint()    public boolean doRepaint; // = false;    /**     * Constructor defines the region in which the ball moves as well     * as its starting position.     */    SmallBall(Canvas c, int left, int top, int width, int height) {        super();        canvas = c;        this.left = left + 1;        this.top = top + 1;        this.width = width - ((2 * radius) + 2);        this.height = height - ((2 * radius) + 2);        // use positive random #s        this.posX = ((random.nextInt() >>> 1) % (this.width - 20)) + 10;        this.posY = ((random.nextInt() >>> 1) % (this.height - 20)) + 10;        deltaX = random.nextInt() & 1;        deltaY = random.nextInt() & 1;        if (deltaX == 0) {            deltaX = -1;        }        if (deltaY == 0) {            deltaY = -1;        }        stop = true;    }    static void slower() {        delay += DELAY_INCREMENT;        if (delay > MAX_DELAY) {            delay = MAX_DELAY;        }    }    static void faster() {        delay -= DELAY_INCREMENT;        if (delay < MIN_DELAY) {            delay = MIN_DELAY;        }    }    /**     * Returns the speed in percent of     * the DEFAULT_DELAY     */    static int getSpeedPercent() {        int ret = 100; // start with 100%        int thisDelay = delay;        while (thisDelay > DEFAULT_DELAY) {            thisDelay /= 2;            ret -= 10;        }        while (thisDelay < DEFAULT_DELAY) {            thisDelay *= 2;            ret += 10;        }        return ret;    }    public void setNote(int note) {        this.note = note;    }    /**     * Starts the ball running.     */    public void run() {        int right = left + width;        int bottom = top + height;        while (!stop) {            ballSize = radius * 2;            // calculate a direction of the ball as an integer in the range            // -2 .. 2 (excluding 0)            int direction = deltaX + deltaY;            if (direction == 0) {                direction = deltaX + (2 * deltaY);            }            // is the current position colliding with any wall            int collision = 0;            if ((posX <= left) || (posX >= right)) {                collision++;            }            if ((posY <= top) || (posY >= bottom)) {                collision += 2;            }            // change the direction appropriately if there was a collision            if (collision != 0) {                try {                    javax.microedition.media.Manager.playTone(note, 100 /*ms*/, 100);                } catch (Exception ex) {                    System.out.println("failed to play tone");                }                collision = (collision - 1) * 2;                deltaX = matrix[direction + 2][collision];                deltaY = matrix[direction + 2][collision + 1];            }            // calculate the new position and queue a repaint            posX += POS_MULTIPLIER * deltaX;            posY += POS_MULTIPLIER * deltaY;            if (doRepaint) {                canvas.repaint();            }            // use the delay to control the speed of the ball            // if the MIDlet is paused, keep on waiting            do {                try {                    // if paused, always wait 100 millis,                    // regardless of ball speed                    Thread.sleep(paused ? 100 : delay);                } catch (InterruptedException e) {                }            } while (paused && !stop);        }    }    /**     * Paint the ball.     */    void paint(Graphics g) {        g.setColor(clr);        g.fillArc(posX, posY, ballSize, ballSize, 0, 360);    }    public void setColor(int clr) {        this.clr = clr;    }    public String toString() {        return super.toString() + " x = " + posX + ", y = " + posY;    }}