tests/org.eclipse.draw2d.test/src/org/eclipse/draw2d/test/PointListTests.java

/*******************************************************************************
 * Copyright (c) 2005, 2010 IBM Corporation 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:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.draw2d.test;

import org.eclipse.draw2d.geometry.PointList;
import org.eclipse.draw2d.geometry.PrecisionPoint;
import org.eclipse.draw2d.geometry.Rectangle;

public class PointListTests extends BaseTestCase {

	public void testIntersects() {
		PointList points = new PointList();
		points.addPoint(0, 0);
		points.addPoint(0, 3);
		// simple case
		assertTrue(points.intersects(new Rectangle(-10, 0, 20, 3)));
		// line starts and ends on opposite edges of the rectangle
		assertTrue(points.intersects(new Rectangle(-2, 1, 4, 1)));
		// parallel
		assertTrue(points.intersects(new Rectangle(0, 0, 10, 10)));
		// vertical
		assertTrue(points.intersects(new Rectangle(0, 3, 10, 10)));
		// line is next to the rectangle (left side)
		assertFalse(points.intersects(new Rectangle(1, 1, 50, 50)));
		// line is next to the rectangle (right side)
		assertFalse(points.intersects(new Rectangle(-5, 0, 5, 5)));
		// empty rect located on the line
		assertFalse(points.intersects(new Rectangle(0, 1, 0, 0)));

		points.addPoint(10, 10);
		// line cuts through two adjacent sides of the rectangle
		assertTrue(points.intersects(new Rectangle(-50, 5, 58, 100)));
		points.removePoint(2);

		points.addPoint(-1, -3);
		// line doesn't intersect with the rect's diagonals
		assertTrue(points.intersects(new Rectangle(-10, 2, 40, 50)));
		points.removeAllPoints();

		points.addPoint(10, 10);
		points.addPoint(8, 12);
		// line starts on rectangle's bottom-right corner
		assertTrue(points.intersects(new Rectangle(0, 0, 11, 11)));
		// line is tangential to the rectangle's bottom-right corner
		assertTrue(points.intersects(new Rectangle(1, 1, 9, 11)));

		points.addPoint(new PrecisionPoint(1.49, 1.49));
		assertFalse(points.intersects(new Rectangle(0, 0, 1, 1)));
	}

}