/*
 * @(#)LineAnim.java	1.10 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.Lines;

import java.awt.*;
import java.awt.geom.*;
import java.awt.font.TextLayout;
import java.awt.event.WindowEvent;
import java.awt.event.WindowListener;
import java.awt.event.WindowAdapter;
import J2DCanvas;


/**
 * Lines & Paths animation illustrating BasicStroke attributes.
 */
public class LineAnim extends J2DCanvas {

    private int caps[] = { BasicStroke.CAP_BUTT, BasicStroke.CAP_SQUARE,
			    BasicStroke.CAP_ROUND};
    private int joins[] = { BasicStroke.JOIN_MITER, BasicStroke.JOIN_BEVEL,
			    BasicStroke.JOIN_ROUND};
    private int rAmt[], direction[], speed[];
    private Line2D lines[];
    private Color colors[] = { Color.gray, Color.pink, Color.lightGray };

    private BasicStroke strokes[];
    private final int CLOCKWISE = 0;
    private final int COUNTERCW = 1;
    private GeneralPath path;
    private Point2D[] pts;
    private float size;


    public LineAnim() {
	setBackground(Color.white);
	runnable = true;
    }


    public void drawDemo(Graphics2D g2) {

	if (newBufferedImage) {

	    size = (w > h) ? h/6f : w/6f;

	    lines = new Line2D[3];
	    strokes = new BasicStroke[lines.length];
	    rAmt = new int[lines.length];
	    direction = new int[lines.length];
	    speed = new int[lines.length];
	    for (int i = 0; i < lines.length; i++) {
		lines[i] = new Line2D.Float(0,0,size,0);
		strokes[i] = new BasicStroke(size/3, caps[i], joins[i]);
		rAmt[i] = i * 360/lines.length;
		direction[i] = i%2;
		speed[i] = i + 1;
	    }

	    path = new GeneralPath();
	    path.moveTo(size, -size/2);
	    path.lineTo(size+size/2, 0);
	    path.lineTo(size, +size/2);

	    Ellipse2D e = new Ellipse2D.Float(w/2-size*2-4.5f,h/2-size*2-4.5f,size*4,size*4);
	    PathIterator pi = e.getPathIterator(null);
	    FlatteningPathIterator f = new FlatteningPathIterator(pi,0.9);
            Point2D[] points = new Point2D[100];
	    int num_pts = 0;
	    while ( !f.isDone() ) {
	        float[] pt = new float[6];
	        switch ( f.currentSegment(pt) ) {
		    case FlatteningPathIterator.SEG_MOVETO:
		    case FlatteningPathIterator.SEG_LINETO:
			    points[num_pts] = new Point2D.Float(pt[0], pt[1]);
                            num_pts++;
	        }
	        f.next();
	    }
            pts = new Point2D[num_pts];
            System.arraycopy(points, 0, pts, 0, num_pts);
	}

	Ellipse2D ellipse = new Ellipse2D.Float(w/2-size,h/2-size,size*2,size*2);
	g2.setColor(Color.black);
	g2.draw(ellipse);

	for (int i = 0; i < lines.length; i++) {
	    AffineTransform at = new AffineTransform();
	    at.translate(w/2,h/2);
	    at.rotate(rAmt[i]*java.lang.Math.PI/180);
	    g2.setStroke(strokes[i]);
	    g2.setColor(colors[i]);
	    g2.draw(at.createTransformedShape(lines[i]));
	    g2.draw(at.createTransformedShape(path));

	    int j = (int) ((double) rAmt[i]/360 * pts.length);
	    j = (j == pts.length) ? pts.length-1 : j;
	    g2.fill(new Ellipse2D.Double(pts[j].getX(), pts[j].getY(), 9, 9));

	    if (direction[i] == CLOCKWISE) {
		rAmt[i] += speed[i];
		if (rAmt[i] == 360)
		    rAmt[i] = 0;
	    } else {
		rAmt[i] -= speed[i];
		if (rAmt[i] == 0)
		    rAmt[i] = 360;
	    }
	}

	g2.setStroke(new BasicStroke(1));
	g2.setColor(Color.black);
	for (int i = 0; i < pts.length; i++)
	    g2.draw(new Ellipse2D.Double(pts[i].getX(), pts[i].getY(), 9, 9));
    }

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