package rebelsky.vec;

import junit.framework.TestCase;
import junit.framework.TestSuite;

/**
 * A simple test of two-dimensional vectors (vectors in two-space),
 * intended primarily to help SamR think about the use of JUnit with
 * interfaces.
 *
 * Note that you do not use this TestCase directly.  Rather, you
 * subclass it and (1) override the coords2point method and (2)
 * add a suite() method.  
 *
 * @author Samuel A. Rebelsky
 * @version 1.0 of September 2004
 */
public abstract class Vec2DTest
	extends TestCase
{
	protected Vec2D[] vecs;

	public abstract Vec2D coords2point(double _x, double _y);

	public void setUp()
	{
		vecs = new Vec2D[]{
			// Origin
			coords2point(0, 0),
			// Along each axis
			coords2point(3, 0),
			coords2point(0, 3),
			coords2point(-3, 0),
			coords2point(0, -3),
			// A few in the first quadrant
			coords2point(1, 3),
			coords2point(2, 2),
			coords2point(3, 1),
			// A few in the second quadrant
			coords2point(-1, 3),
			coords2point(-2, 2),
			coords2point(-3, 1),
			// A few in the third quadrant
			coords2point(-1, -3),
			coords2point(-2, -2),
			coords2point(-3, -1),
			// A few in the fourth quadrant
			coords2point(1, -3),
			coords2point(2, -2),
			coords2point(3, -1),
		};
	} // setup()

	public void xtestPrint()
	{
		for (int i = 0; i < vecs.length; i++) {
			System.out.println(vecs[i]);
		}
	} // testPrint()

	public void testEquals()
	{
		for (int i = 0; i < vecs.length; i++) {
			assertEquals(vecs[i],vecs[i]);
		}
	} // testEquals()

	public void testRotate()
	{
		for (int i = 0; i < vecs.length; i++) {
			// Rotation by 0
			Vec2D rot = vecs[i].rotate(0);
			assertEquals(rot.getX(), vecs[i].getX(), 0.0);
			assertEquals(rot.getY(), vecs[i].getY(), 0.0);
			assertEquals(rot.getAngle(), vecs[i].getAngle(), 0.0);
			assertEquals(rot.getRadius(), vecs[i].getRadius(), 0.0);
			// Rotation by 2pi = identity
			rot = vecs[i].rotate(2*Math.PI);
			assertEquals(rot.getX(), vecs[i].getX(), 0.0001);
			assertEquals(rot.getY(), vecs[i].getY(), 0.0001);
			assertEquals(rot.getAngle(), vecs[i].getAngle(), 0.0001);
			assertEquals(rot.getRadius(), vecs[i].getRadius(), 0.0001);
		} // for
	} // testRotate()
} // Vec2DTest