PC Plus SuperCD (UK) 2000 March/pcp161b.iso/handson/archive/Issue153/java/Ripple.java

Java Source | 1999-04-04 | 4.2 KB | 183 lines

/*
 * @(#)Ripple.java    1.0 1999/03/04
 *
 * Copyright (c) 1999, David Griffiths. All Rights Reserved.
 *
 * This software is the proprietary information of David Griffiths.
 * This source code may not be published or redistributed without the
 * express permission of the author.
 *
 * THE AUTHOR MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY
 * OF THE SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
 * PURPOSE, OR NON-INFRINGEMENT. THE AUTHOR SHALL NOT BE LIABLE FOR ANY DAMAGES
 * SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR DISTRIBUTING
 * THIS SOFTWARE OR ITS DERIVATIVES.
 *
 */

/**
 * Ripple is an applet calss that takes an image and applies virtual
 * and horizontal sine tranlsations to the pixels.
 *
 * @version    1.0 1999/03/04
 * @author     David Griffiths
 */

import java.awt.*;
import java.applet.Applet;
import java.awt.image.ImageObserver;
import java.io.PrintStream;

public class Ripple extends Applet implements Runnable {
    static boolean dispCopy;
    Image origImg;
    Image backImg;
    Image finImg;
    int w1;
    int h1;
    Graphics backG;
    Graphics finG;
    int phase;
    Thread thrRipple;
    int frameNo;
    int frames;
    int period;
    boolean stopIt;
    boolean borderGap;
    boolean imLoaded;

    public void init() {
        String param;

        if (!dispCopy) {
            System.out.println("Ripple v 1.0 for Java");
            dispCopy = true;
        }
        setBackground(Color.white);
        origImg = getImage(getDocumentBase(), getParameter("image"));
        borderGap = "on".equals(getParameter("bordergap"));
        w1 = origImg.getWidth(this);
        h1 = origImg.getHeight(this);
        if (h1 > 0 && w1 > 0)
            stopIt = false;
        param = getParameter("period");
        if (param != null)
            period = Integer.parseInt(param);
        else
            period = 24;

        param = getParameter("frames");
        if (param != null)
            frames = Integer.parseInt(param);
        else
            frames = 12;
    }

    public void start() {
        if (thrRipple == null) {
            thrRipple = new Thread(this);
            thrRipple.start();
        }
    }

    public void stop() {
        if (thrRipple != null) {
            thrRipple.stop();
            thrRipple = null;
        }
    }

    public boolean imageUpdate(Image image, int i1, int j1, int k, int i2, int j2) {
        boolean flag = true;
        if ((i1 & 2) > 0)
            h1 = j2;
        if ((i1 & 1) > 0)
            w1 = i2;
        if ((i1 & 32) > 0)
            imLoaded = true;
        if (imLoaded && w1 > 0 && h1 > 0) {
            stopIt = false;
            flag = false;
        }
        return flag;
    }

    public void createIt() {
        backImg = createImage(w1, h1);
        backG = backImg.getGraphics();
        finImg = createImage(w1, frames * h1);
        finG = finImg.getGraphics();
        backG.setColor(Color.white);
        for (phase = 0; phase < frames; phase++) {
            backG.drawImage(origImg, 0, 0, this);
            transformImage(backG);
            finG.drawImage(backImg, 0, phase * h1, this);
        }
    }

    public void transformImage(Graphics g) {
        translateX(g);
        translateY(g);
    }

    public void translateX(Graphics g) {
        for (int i = 0; i < h1; i++) {
            double d = (double)(period >> 1) * Math.sin((double)i / period + 6.283185307179586 * phase / frames);
            g.copyArea(0, i, w1, 1, (int)d, 0);
            if (borderGap) {
                g.drawLine((int)d, i, 0, i);
                g.drawLine((int)d + w1, i, w1, i);
            }
        }
    }

    public void translateY(Graphics g) {
        for (int i = 0; i < w1; i++) {
            double d = (double)(period >> 1)
                * Math.sin((double)i / period
                    + 6.283185307179586 * phase / frames);
            g.copyArea(i, 0, 1, h1, 0, (int)d);
            if (borderGap) {
                g.drawLine(i, (int)d, i, 0);
                g.drawLine(i, (int)d + h1, i, h1);
            }
        }
    }

    public void run() {
        while (thrRipple != null) {
            try {
                Thread.sleep(50);
            }
            catch (InterruptedException e) {
            }
            frameNo = (frameNo + 1) % frames;
            repaint();
        }
    }

    public void update(Graphics g) {
        paint(g);
    }

    public void paint(Graphics g) {
        if (!stopIt) {
            stopIt = true;
            createIt();
        }
        if (finImg != null) {
            g.drawImage(finImg, 0, -frameNo * h1, this);
            g.drawImage(finImg, 0, (frames - frameNo) * h1, this);
            return;
        }
        g.drawImage(origImg, 0, 0, this);
    }

    public Ripple() {
        stopIt = true;
        borderGap = true;
        imLoaded = false;
    }
}