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  [SOLVED] Help Java2D Moving Bounds: Why won't this work?  (Read 1117 times)
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Offline hippocrypt

Junior Newbie





« Posted 2012-08-24 16:50:26 »

Why doesn't this code output "45, 67"?

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import java.awt.geom.Ellipse2D;

public class BoundsTest {
  public static void main(String[] args) {
    Ellipse2D e = new Ellipse2D.Float(0, 0, 20, 20);
    e.getBounds().setLocation(45, 67);
    System.out.println(e.getBounds().x + ", " + e.getBounds().y);
  }
}
Offline nsigma
« Reply #1 - Posted 2012-08-24 17:15:23 »

Because getBounds() returns a new Rectangle, so changing it doesn't change the ellipse.  Try using one of the setFrame(..) methods instead.

I love that Ellipse2D extends RectangularShape - the only place on Earth where a circle is a square!  Grin  (yes, I know what they mean)


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Offline sproingie

JGO Kernel


Medals: 202



« Reply #2 - Posted 2012-08-24 17:16:48 »

The Rectangle returned by getBounds is a new object, so changing its shape doesn't affect the shape you got it from.  If you want to apply your transformations to the bounds, use the setFrame method, like this:

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import java.awt.geom.Ellipse2D;
import java.awt.Rectangle;

public class BoundsTest {
  public static void main(String[] args) {
    Ellipse2D e = new Ellipse2D.Float(0, 0, 20, 20);
    Rectangle r = e.getBounds();
    r.setLocation(45, 67);
    e.setFrame(r);
    System.out.println(e.getBounds().x + ", " + e.getBounds().y);
  }
}

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Offline hippocrypt

Junior Newbie





« Reply #3 - Posted 2012-08-24 17:36:31 »

I see, thanks.
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