/*******************************************************************************
* Copyright (c) 2011, 2015 itemis AG and others.
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Matthias Wienand (itemis AG) - initial API and implementation
*
*******************************************************************************/
package org.eclipse.gef.geometry.examples.intersection;
import org.eclipse.gef.geometry.planar.Ellipse;
import org.eclipse.gef.geometry.planar.IGeometry;
import org.eclipse.gef.geometry.planar.Point;
import org.eclipse.gef.geometry.planar.Polygon;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.widgets.Canvas;
public class PolygonEllipseIntersection
extends AbstractPolygonIntersectionExample {
/**
* @param args
*/
public static void main(String[] args) {
new PolygonEllipseIntersection();
}
public PolygonEllipseIntersection() {
super("Polygon/Ellipse Intersection");
}
@Override
protected Point[] computeIntersections(IGeometry g1, IGeometry g2) {
return ((Polygon) g1).getOutline()
.getIntersections(((Ellipse) g2).getOutline());
}
@Override
protected AbstractControllableShape createControllableShape2(
Canvas canvas) {
return new AbstractControllableShape(canvas) {
@Override
public void createControlPoints() {
ControlPoint center = addControlPoint(new Point(300, 300));
ControlPoint a = addControlPoint(new Point(400, 300));
ControlPoint b = addControlPoint(new Point(300, 200));
a.setYLink(center);
b.setXLink(center);
}
@Override
public Ellipse createGeometry() {
Point[] points = getControlPoints();
double a = Math.abs(points[0].x - points[1].x);
double b = Math.abs(points[0].y - points[2].y);
return new Ellipse(points[0].x - a, points[0].y - b, 2 * a,
2 * b);
}
@Override
public void drawShape(GC gc) {
Ellipse ellipse = createGeometry();
gc.drawOval((int) ellipse.getX(), (int) ellipse.getY(),
(int) ellipse.getWidth(), (int) ellipse.getHeight());
}
};
}
}