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LineAnim.javaAPI DocExample5505Wed Aug 08 15:13:48 BST 2001demos.Lines

LineAnim

public class LineAnim extends AnimatingSurface
Lines & Paths animation illustrating BasicStroke attributes.

Fields Summary
private static int[]
caps
private static int[]
joins
private static Color[]
colors
private static BasicStroke
bs1
private static final int
CLOCKWISE
private static final int
COUNTERCW
private Line2D[]
lines
private int[]
rAmt
private int[]
direction
private int[]
speed
private BasicStroke[]
strokes
private GeneralPath
path
private Point2D[]
pts
private float
size
private Ellipse2D
ellipse
Constructors Summary
public LineAnim()



      
        setBackground(Color.white);
Methods Summary
public static voidmain(java.lang.String[] argv)

        createDemoFrame(new LineAnim());
public voidrender(int w, int h, java.awt.Graphics2D g2)


        ellipse.setFrame(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 = AffineTransform.getTranslateInstance(w/2,h/2);
            at.rotate(Math.toRadians(rAmt[i]));
            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;
            ellipse.setFrame(pts[j].getX(), pts[j].getY(), 9, 9);
            g2.fill(ellipse);
        }

        g2.setStroke(bs1);
        g2.setColor(Color.black);
        for (int i = 0; i < pts.length; i++) {
            ellipse.setFrame(pts[i].getX(), pts[i].getY(), 9, 9);
            g2.draw(ellipse);
        }
public voidreset(int w, int h)

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

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

        for (int i = 0; i < lines.length; i++) {
            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;
                }
            }
        }