PC Online 1997 October/PCO1097.ISO/FilesBBS/FREI/CUECARDS.EXE/CueCards.java

Java Source | 1997-02-21 | 4.8 KB | 197 lines

import java.awt.Graphics;
import java.awt.Image;
import java.awt.Color;
import java.lang.Math;
import java.awt.*;

public class CueCards extends java.applet.Applet implements Runnable {
    static boolean  dispCopy = false;
    Image       origImg, backImg, animImg;
    int         w1, h1;
    Graphics    backG, finG;
    Thread      nick;
    int         frameNo = 0;
    int         frames = 12;
    int         period = 50;
    boolean     needAnim = false;
    boolean     imLoaded = false;
//    boolean     imReady = false;
    boolean     needImage = false;
    boolean     animReady = false;
    double      angle1;
    int         imageNo = 1;
    Color       backCol;

    public void init () {
        if (!dispCopy) {
            System.out.println ("cueCards v 1.0 for Java");
            System.out.println ("Copyright (c) "
                + "David Griffiths, 1996. "
                + "All rights reserved.");
            System.out.println ("For more information visit "
                + "http://www.demon.co.uk/davidg,");
            System.out.println ("or contact: "
                + "[e-mail]");
            dispCopy = true;
        }
        backCol = new Color (Integer.parseInt(
            getParameter("bgcolor").substring(1),16));
        setBackground (backCol);
        loadImage ();
    }

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

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

    public void run () {
        while (nick != null) {
            if (needImage) {
                needImage = false;
                loadImage ();
            }
            if (needAnim) {
                needAnim = false;
                animReady = false;
                createAnim ();
            }
            repaint ();
//            if (imReady && (frameNo < frames)) {
            if (frameNo < frames) {
                if (frameNo == (frames - 1))
                    needAnim = true;
                frameNo++;
            }
            else if (frameNo >= frames) {
                if (frameNo == frames)
                    needImage = true;
                if (frameNo == (frames << 1) - 1) {
                    frameNo = 0;
                }
                frameNo++;
            }
            try     {Thread.sleep (50);}
            catch   (InterruptedException e) {}
        }
    }

    public void loadImage () {
        MediaTracker tracker = new MediaTracker(this);
        String nextImage = getParameter ("image" + imageNo);
        if (nextImage == null) {
            imageNo = 1;
            nextImage = getParameter ("image1");
        }
        imageNo++;
        imLoaded = false;
//        imReady = false;
        origImg = getImage (getDocumentBase(), nextImage);

        tracker.addImage(origImg, 0);

        // Wait until all images are fully loaded
        //------------------------------------------------------------------
        try tracker.waitForAll(); catch (InterruptedException e) {}

        w1 = origImg.getWidth (this);
        h1 = origImg.getHeight (this);
//        if ((w1 != -1) && (h1 != -1))
//            imReady = true;
    }

    public void rotateImage (Graphics g, double angle) {
        double twistAngle = angle;
        double quart = (Math.PI / 2.0);
        double oct = (Math.PI / 4.0);

        if (twistAngle > oct) {
            shearY (g, 1);
            shearX (g, 1);
            shearY (g, 1);
            twistAngle -= quart;
        }

        shearX(g, Math.tan (twistAngle / 2.0));
        shearY(g, Math.sin (twistAngle));
        shearX(g, Math.tan (twistAngle / 2.0));
    }

    public void shearX (Graphics g, double shearing) {
        double l;
        for (int i = 0; i < (h1<<1); i++) {
            l = ((double)i * -shearing)
                + ((double)h1 * shearing);
            g.copyArea (0, i, ((w1 * 3) >> 1), 1, (int)l, 0);
            g.drawLine ((int)l, i, 0, i);
            g.drawLine ((int)l + ((w1 * 3) >> 1),
                i, (w1 * 3) >> 1, i);
        }
    }

    public void shearY (Graphics g, double shearing) {
        double l;
        for (int i = 0; i < ((w1 * 3) >> 1); i++) {
            l = ((double)i * shearing);
            g.copyArea (i, 0, 1, h1<<1, 0, (int)l);
            g.drawLine (i, (int)l, i, 0);
            g.drawLine (i, (int)l + (h1<<1), i, h1<<1);
        }
    }

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

    public void paint (Graphics g) {
//        if ((frameNo < frames) && imReady) {
        if (frameNo < frames) {
            g.drawImage (origImg,
                0, (frameNo * frameNo * h1
                / ((frames - 1) * (frames - 1))) - h1,
                this);
        }
        else if ((frameNo == frames) && animReady) {
            g.drawImage (origImg,
                0, 0, this);
        }
        else if ((frameNo > frames) && animReady) {
            int i = frameNo - frames;
            g.drawImage (animImg, 0, (-i * h1), this);
        }
        else
            if (origImg != null)
                g.drawImage (origImg, 0, 400, this);
    }

    public void createAnim () {
        System.gc();
        if (backImg == null) {
            backImg = createImage ((w1 * 3) >> 1, h1<<1);
            backG = backImg.getGraphics();
            animImg = createImage (w1, frames * h1);
            finG = animImg.getGraphics();
            backG.setColor (backCol);
        }
        for (int phase = 0; phase < frames; phase++) {
            backG.fillRect (0,0,w1,h1<<1);
            backG.drawImage (origImg, 0, 0, this);
            rotateImage (backG, 0.6 * Math.PI
                    * (double) phase * (double) phase
                    / (double) frames / (double) frames);
            finG.drawImage (backImg,
                0, phase * h1, this);
        }
        animReady = true;
    }
}