Hmm, I read his message as meaning he just wanted to produce two non-sheared
ellipses with an angle between their, say, major axes of 40 degrees, i.e.
what he wants is a rotation around the center of the ellipse(s). But I could
be wrong.
Cheers,
Pete
Jim Graham wrote:
>
> > I want to draw two Ellipses on different direction(eg, the anger between the
> > two axises is 40 degree).
> > Does the Graphics2D provides a simple way to solve the problem?
>
> You can create an Ellipse2D object with perpendicular axes and then
> transform it with a shearing transform to produce a sheared ellipse
> with axes at a different angle:
>
> Ellipse2D ellipse = new Ellipse2D.Double(x, y, w, h);
> AffineTransform at = new AffineTransform();
> at.shear(Math.tan(Math.toRadians(90 - angle)), 0);
> Shape s = at.createTransformedShape(ellipse);
>
> Attached is a small test program to show this...
>
> ...jim
>
> ----------------------------------------------------------------------------
> import java.awt.*;
> import java.awt.geom.*;
> import java.awt.event.*;
>
> public class Ellipsoid extends Canvas {
> int angle = 90;
>
> public Dimension getPreferredSize() {
> return new Dimension(400, 400);
> }
>
> public void paint(Graphics g) {
> // Code to create skewed Ellipse
> Ellipse2D ellipse = new Ellipse2D.Double(-50, -100, 100, 200);
> AffineTransform at = new AffineTransform();
> at.shear(Math.tan(Math.toRadians(90 - angle)), 0);
> Shape s = at.createTransformedShape(ellipse);
> // End code to create skewed Ellipse
>
> // Code to illustrate results
> Graphics2D g2d = (Graphics2D) g;
> g2d.setColor(Color.white);
> g2d.drawString("Angle = "+angle, 10, 20);
> g2d.setStroke(new BasicStroke(3));
> g2d.translate(200, 200);
> g2d.setColor(Color.blue);
> g2d.fill(s);
> g2d.setColor(Color.green);
> g2d.draw(s);
> g2d.transform(at);
> g2d.setColor(Color.red);
> g2d.drawLine(-50, 0, 50, 0);
> g2d.drawLine(0, -100, 0, 100);
> }
>
> public void newAngle(int ang) {
> this.angle = ang;
> repaint();
> }
>
> public static void main(String argv[]) {
> Frame f = new Frame();
> f.addWindowListener(new WindowAdapter() {
> public void windowClosing(WindowEvent e) { System.exit(0); }
> });
> final Ellipsoid ell = new Ellipsoid();
> Scrollbar sb = new Scrollbar(Scrollbar.HORIZONTAL, 90, 10, 30, 160);
> sb.addAdjustmentListener(new AdjustmentListener() {
> public void adjustmentValueChanged(AdjustmentEvent e) {
> ell.newAngle(e.getValue());
> }
> });
> f.setLayout(new BorderLayout());
> f.add(ell, "Center");
> f.add(sb, "South");
> f.pack();
> f.show();
> }
> }
--
Pete Cockerell
California, USA
<http://www.best.com/~petec>
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