/*
 * @(#)ClipAnim.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.Clipping;

import java.awt.*;
import java.awt.geom.*;
import java.awt.event.*;
import J2DCanvas;


/**
 * Animated clipping of an image & composited shapes.
 */
public class ClipAnim extends J2DCanvas {

    private Image img;
    private Shape clip;
    private Rectangle2D rectClip = new Rectangle2D.Float();
    private final double OINC[] = {5.0, 3.0};
    private final double SINC[] = {5.0, 5.0};
    private double x, y;
    private double ix = OINC[0];
    private double iy = OINC[1];
    private double iw = SINC[0];
    private double ih = SINC[1];
    private double ew, eh;   // ellipse width & height


    public ClipAnim() {
	setBackground(Color.white);
        img = getImage("images/clouds.jpg");
	runnable = true;
    }


    public void drawDemo(Graphics2D g2) {

	if (newBufferedImage) {
       	    x = Math.random()*w;
       	    y = Math.random()*h;
       	    ew = (Math.random()*w)/2;
       	    eh = (Math.random()*h)/2;
	}
        x += ix;
        y += iy;
        ew += iw;
        eh += ih;
        if (ew > w/2) {
            ew = w/2;
	    iw = Math.random() * -w/16 - 1;
        }
        if (ew < w/8) {
            ew = w/8;
	    iw = Math.random() * w/16 + 1;
        }
        if (eh > h/2) {
            eh = h/2;
	    ih = Math.random() * -h/16 - 1;
        }
        if (eh < h/8) {
            eh = h/8;
	    ih = Math.random() * h/16 + 1;
        }
        if ((x+ew) > w) {
            x = (w - ew)-1;
	    ix = Math.random() * -w/32 - 1;
        }
        if (x < 0) {
            x = 2;
	    ix = Math.random() * w/32 + 1;
        }
        if ((y+eh) > h) {
            y = (h - eh)-2;
	    iy = Math.random() * -h/32 - 1;
        }
        if (y < 0) {
            y = 2;
	    iy = Math.random() * h/32 + 1;
        }
        clip = new Ellipse2D.Float((float)x, (float)y, (float)ew, (float)eh);
        rectClip.setRect(x+5, y+5, ew-10, eh-10);

        g2.setClip(clip);
        g2.clip(rectClip);

        g2.setComposite(AlphaComposite.SrcOver);
        g2.drawImage(img, 0, 0, w, h, this);

        AlphaComposite composite = AlphaComposite.getInstance(
                                   AlphaComposite.SRC_OVER, .5f);
        GeneralPath p = new GeneralPath();

        p.moveTo(- w / 2.0f, - h / 8.0f);
        p.lineTo(+ w / 2.0f, - h / 8.0f);
        p.lineTo(- w / 4.0f, + h / 2.0f);
        p.lineTo(+         0.0f, - h / 2.0f);
        p.lineTo(+ w / 4.0f, + h / 2.0f);
        p.closePath();

        AffineTransform at = new AffineTransform();
        at.translate(w*.5f, h*.5f);
        g2.setPaint(new Color(255, 0, 0));
        g2.transform(at);
        g2.setComposite(composite);
        g2.setStroke(new BasicStroke(20.0f));
        g2.draw(p);

        g2.setPaint(new Color(0, 255, 0));
	at.setToIdentity();
        g2.setTransform(at);

	Shape shape = null;
	for (int yy = 0; yy < h; yy += 50) {
	    for (int xx = 0, i=0; xx < w; i++, xx += 50) {
	        switch (i) {
		case 0 : shape = new Arc2D.Float(xx, yy, 25, 25, 45, 270, Arc2D.PIE);
			 break;
		case 1 : shape = new Ellipse2D.Float(xx, yy, 25, 25);
			 break;
		case 2 : shape = new RoundRectangle2D.Float(xx, yy, 25, 25, 4, 4);
			 break;
		case 3 : shape = new Rectangle2D.Float(xx, yy, 25, 25);
			 i = -1;
	        }
       		g2.fill(shape);
	    }
	}

	g2.setClip(new Rectangle(0,0,w,h));
    }


    public static void main(String s[]) {
	final ClipAnim demo = new ClipAnim();
	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 - ClipAnim");
	f.addWindowListener(l);
	f.add("Center", demo);
	f.pack();
	f.setSize(new Dimension(400,300));
	f.show();
	demo.start();
    }
}