Why isn't first and third rectangle appear in the sample below?
Looks like rectangle is broken once it has zero size.
package tests.piccolo;
import org.piccolo2d.extras.PFrame;
import org.piccolo2d.nodes.PPath;
public class Try_EmptyRectangle {
public static void main(String[] args) {
new PFrame() {
@Override
public void initialize() {
PPath rect1 = PPath.createRectangle(0, 0, 0, 0);
PPath rect2 = PPath.createRectangle(0, 100, 1, 1);
PPath rect3 = PPath.createRectangle(0, 200, 1, 1);
getCanvas().getLayer().addChild(rect1);
getCanvas().getLayer().addChild(rect2);
rect1.setWidth(50);
rect1.setHeight(50);
rect2.setWidth(50);
rect2.setHeight(50);
rect3.setWidth(0);
rect3.setHeight(0);
rect3.setWidth(50);
rect3.setHeight(50);
}
};
}
}
This looks like a bug. PPath internally wraps GeneralPath. PPath.createRectangle(0, 0, 0, 0) initializes GeneralPath to a zero size rectangle shape. Then changing PPath width/height triggers the bounds change. PPath overrides internalUpdateBounds() in order to scale the path to fit into the specified bounds. There seem to be a problem with zero sized path:
protected void internalUpdateBounds(final double x, final double y, final double width, final double height) {
final Rectangle2D pathBounds = path.getBounds2D();
...
final double scaleX;
if (adjustedWidth == 0 || pathBounds.getWidth() == 0) {
scaleX = 1;
}
...
final double scaleY;
if (adjustedHeight == 0 || pathBounds.getHeight() == 0) {
scaleY = 1;
}
...
TEMP_TRANSFORM.scale(scaleX, scaleY);
...
path.transform(TEMP_TRANSFORM);
}
scaleX and scaleY are always 1. So the path is actually never scaled and remains zero size.