/*
 * @(#)Intersection.java	1.18 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.event.*;
import java.awt.image.BufferedImage;
import java.awt.geom.Line2D;
import java.awt.geom.Rectangle2D;
import java.awt.font.FontRenderContext;
import java.awt.font.TextLayout;
import J2DCanvas;


/**
 * Animated intersection clipping of lines, an image and a textured rectangle.
 */
public class Intersection extends J2DCanvas {

    private Image img;
    private int rectW, rectH, x1, y1, x2, y2;
    private final int IN = 0;
    private final int OUT = 1;
    private int direction = IN;
    private int fillType = 0;
    private TexturePaint tp;
    private TextLayout tl = new TextLayout("Intersection Clipping", font, new FontRenderContext(null, false, false));


    public Intersection() {
	setBackground(Color.white);
        img = getImage("images/clouds.jpg");
	Font f = new Font("Dialog", Font.ITALIC, 12);
	TextLayout tl = new TextLayout("Java2D", f, new FontRenderContext(null, false, false));
	int sw = (int) tl.getBounds().getWidth();
	int sh = (int) (tl.getAscent() + tl.getDescent());
        BufferedImage bi = new BufferedImage(sw, sh, BufferedImage.TYPE_INT_RGB);
        Graphics2D big = bi.createGraphics();
        big.setBackground(Color.gray);
        big.setColor(Color.cyan);
        tl.draw(big, 0, (float) tl.getAscent());
	Rectangle r = new Rectangle(0,0,sw,sh);
	tp = new TexturePaint(bi, r);
	runnable = true;
    }


    public void drawDemo(Graphics2D g2) {
	if (newBufferedImage) {
            rectW = w/3;
            rectH = h/3;
            x1 = w/6;
	    y1 = h/6;
            x2 = x1+rectW;
	    y2 = y1+rectH;
        }

        g2.setColor(Color.black);
	tl.draw(g2, (int) (w/2-tl.getBounds().getWidth()/2),
	    (int) tl.getBounds().getHeight());

        if (direction == IN) {
            ++x1; ++y1; --x2; --y2;
            if (x1 >= x2 || y1 >= y2)
                direction = OUT;
        }
        if (direction == OUT) {
            --x1; --y1; ++x2; ++y2;
            if (x1 <= w/6) {
                direction = IN;
                fillType++;
            }
        }

	Rectangle rect1 = new Rectangle(x1, y1, rectW, rectH);
	Rectangle rect2 = new Rectangle(x2, y2, rectW, rectH);
	g2.setClip(rect1);
	g2.clip(rect2);

        switch (fillType%3) {
            case 0 : g2.setColor(Color.gray);
	             g2.fill(rect1);
	             g2.setColor(Color.yellow);
	             for (int j = y1; j < y1+rectH; j+=5)
	                 g2.drawLine(0,j,w,j);
                     break;
            case 1 : g2.drawImage(img, x1, y1, rectW, rectH, this);
                     break;
            case 2 : g2.setPaint(tp);
	             g2.fill(rect1);
        }

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

	g2.setColor(Color.black);
	g2.draw(rect1);
	g2.draw(rect2);
    }


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