StraightTest.java

/*******************************************************************************
 * Copyright (c) 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:
 *     Research Group Software Construction,
 *     RWTH Aachen University, Germany - Contribution for Bugzilla 245182
 */
package org.eclipse.draw2d.test;

import junit.framework.TestCase;

import org.eclipse.draw2d.geometry.PrecisionPoint;
import org.eclipse.draw2d.geometry.Straight;
import org.eclipse.draw2d.geometry.Vector;

/**
 * @author Alexander Nyssen
 * 
 */
public class StraightTest extends TestCase {

	public void test_getIntersection() {
		// test integer precision
		Vector p = new Vector(1, 1);
		Vector a = new Vector(2, 1);
		Vector q = new Vector(1, 4);
		Vector b = new Vector(1, -1);
		Straight s1 = new Straight(p, a);
		Straight s2 = new Straight(q, b);
		Vector intersection = s1.getIntersection(s2);
		assertTrue(intersection.equals(new Vector(3, 2)));
		assertTrue(s1.contains(intersection));
		assertTrue(s2.contains(intersection));

		// check straight does not intersect itself
		assertNull(new Straight(p, a).getIntersection(new Straight(p, a)));

		// test double precision
		p = new Vector(0, 0);
		a = new Vector(new PrecisionPoint(0, 0), new PrecisionPoint(5, 5));
		q = new Vector(0, 5);
		b = new Vector(new PrecisionPoint(0, 5), new PrecisionPoint(5, 0));
		s1 = new Straight(p, a);
		s2 = new Straight(q, b);
		intersection = s1.getIntersection(s2);
		assertTrue(intersection.equals(new Vector(2.5, 2.5)));
		assertTrue(s1.contains(intersection));
		assertTrue(s2.contains(intersection));

		PrecisionPoint p1 = new PrecisionPoint(-2, 1);
		PrecisionPoint p2 = new PrecisionPoint(1, 1);
		PrecisionPoint p3 = new PrecisionPoint(0, 0);
		PrecisionPoint p4 = new PrecisionPoint(0, 3);
		s1 = new Straight(p1, p2);
		s2 = new Straight(p3, p4);
		intersection = s1.getIntersection(s2);
		assertTrue(intersection.equals(new Vector(0, 1)));
		assertTrue(s1.contains(intersection));
		assertTrue(s2.contains(intersection));

		// check four rounding effects
		p1 = new PrecisionPoint(-50, 5);
		p2 = new PrecisionPoint(7, 104);
		p3 = new PrecisionPoint(0, 0);
		p4 = new PrecisionPoint(0, 3);

		s1 = new Straight(p1, p2);
		s2 = new Straight(p3, p4);
		assertTrue(s1.intersects(s2));
		intersection = s1.getIntersection(s2);
		assertNotNull(intersection);
		assertTrue(s1.contains(intersection));
		assertTrue(s2.contains(intersection));
	}

	public void test_isParallelTo() {
		Straight s1 = new Straight(new Vector(0, 0), new Vector(3, 3));
		Straight s2 = new Straight(new Vector(0, 4), new Vector(2, 2));
		assertTrue(s1.isParallelTo(s2));

		s1 = new Straight(new Vector(0, 0), new Vector(5, 5));
		s2 = new Straight(new Vector(0, 5), new Vector(0, 5));
		assertFalse(s1.isParallelTo(s2));
	}

	public void test_getAngle() {
		Straight s1 = new Straight(new Vector(0, 0), new Vector(3, 3));
		Straight s2 = new Straight(new Vector(0, 4), new Vector(2, 2));
		assertTrue(s1.getAngle(s2) == 0.0);

		s1 = new Straight(new Vector(0, 0), new Vector(5, 5));
		s2 = new Straight(new Vector(0, 5), new Vector(0, 5));
		assertTrue((float) s1.getAngle(s2) == 45.0); // rounding effects
	}

	public void test_equals() {
		Straight s1 = new Straight(new Vector(0, 0), new Vector(3, 3));
		Straight s2 = new Straight(new Vector(4, 4), new Vector(2, 2));
		assertTrue(s1.equals(s2));
	}
}