/*
 * @(#)WarpImage.java	1.11 98/06/29
 *
 * Copyright 1998 by Sun Microsystems, Inc.,
 * 901 San Antonio Road, Palo Alto, California, 94303, U.S.A.
 * All rights reserved.
 *
 * This software is the confidential and proprietary information
 * of Sun Microsystems, Inc. ("Confidential Information").  You
 * shall not disclose such Confidential Information and shall use
 * it only in accordance with the terms of the license agreement
 * you entered into with Sun.
 */

package demos.Images;

import java.awt.*;
import java.awt.event.*;
import java.awt.geom.CubicCurve2D;
import java.awt.geom.Point2D;
import java.awt.geom.FlatteningPathIterator;
import java.awt.geom.PathIterator;
import J2DCanvas;


/**
 * Warps a image on a CubicCurve2D flattened path.
 */
public class WarpImage extends J2DCanvas {

    private int iw, ih, iw2, ih2;
    private Image img;
    private Point2D pts[];
    private final int FORWARD = 0;
    private final int BACK = 1;
    private int direction = FORWARD;
    private int pNum = 0;


    public WarpImage() {
        setBackground(Color.white);
	img = getImage("images/surfing.gif");
        iw = img.getWidth(this);
        ih = img.getHeight(this);
	iw2 = iw/2;
	ih2 = ih/2;
	runnable = true;
    }

    public void drawDemo(Graphics2D g2) {

	if (newBufferedImage) {
	    CubicCurve2D cc = new CubicCurve2D.Float(w/6,h/2,w/3,0,
				    	    w/1.5f,h,w-w/6,h/2);
	    PathIterator pi = cc.getPathIterator(null);
	    FlatteningPathIterator fpi = new FlatteningPathIterator(pi,0.1);
            Point2D tmp[] = new Point2D[200];
            int i = 0;
	    while ( !fpi.isDone() ) {
	        float[] coords = new float[6];
	        switch ( fpi.currentSegment(coords) ) {
		    case fpi.SEG_MOVETO:
		    case fpi.SEG_LINETO:
		        tmp[i] = new Point2D.Float(coords[0], coords[1]);
		}
                i++;
	        fpi.next();
	    }
            pts = new Point2D[i];
            System.arraycopy(tmp,0,pts,0,i);
        }

        int x = (int) pts[pNum].getX();
        int y = (int) pts[pNum].getY();
        if (direction == FORWARD)
            if (++pNum == pts.length)
                direction = BACK;
        if (direction == BACK)
            if (--pNum == 0)
                direction = FORWARD;

	g2.drawImage(img,
			0,		0,		x,		y,
			0,		0,		iw2,		ih2,
			this);
	g2.drawImage(img,
			x,		0,		w,		y,
			iw2,		0,		iw,		ih2,
			this);
	g2.drawImage(img,
			0,		y,		x,		h,
			0,		ih2,		iw2,		ih,
			this);
	g2.drawImage(img,
			x,		y,		w,		h,
			iw2,		ih2,		iw,		ih,
			this);
    }


    public static void main(String s[]) {
	final WarpImage demo = new WarpImage();
	WindowListener l = new WindowAdapter() {
	    public void windowClosing(WindowEvent e) {System.exit(0);}
	    public void windowDeiconified(WindowEvent e) { demo.start(); }
	    public void windowIconified(WindowEvent e) { demo.stop(); }
	};
	Frame f = new Frame("Java2D Demo - WarpImage");
	f.addWindowListener(l);
	f.add("Center", demo);
	f.pack();
	f.setSize(new Dimension(400,300));
	f.show();
	demo.start();
    }
}