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* Copyright (c) 2013, Daniel Murphy
* All rights reserved.
*
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* are permitted provided that the following conditions are met:
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/**
* Created at 4:32:38 AM Jan 14, 2011
*/
package org.jbox2d.utests;
import java.util.Random;
import org.jbox2d.common.Mat22;
import org.jbox2d.common.Mat33;
import org.jbox2d.common.MathUtils;
import org.jbox2d.common.Vec2;
import org.jbox2d.common.Vec3;
import junit.framework.TestCase;
/**
* @author Daniel Murphy
*/
public class MathTest extends TestCase {
private final static int MAX = (int) (Float.MAX_VALUE / 1000);
private final static int RAND_ITERS = 100;
public void testFastMath() {
Random r = new Random();
for (int i = 0; i < RAND_ITERS; i++) {
float a = r.nextFloat() * MAX - MAX / 2;
assertEquals((int) Math.floor(a), MathUtils.floor(a));
}
for (int i = 0; i < RAND_ITERS; i++) {
float a = r.nextFloat() * MAX - MAX / 2;
assertEquals((int) Math.ceil(a), MathUtils.ceil(a));
}
for (int i = 0; i < RAND_ITERS; i++) {
float a = r.nextFloat() * MAX - MAX / 2;
float b = r.nextFloat() * MAX - MAX / 2;
assertEquals(Math.max(a, b), MathUtils.max(a, b));
}
for (int i = 0; i < RAND_ITERS; i++) {
float a = r.nextFloat() * MAX - MAX / 2;
float b = r.nextFloat() * MAX - MAX / 2;
assertEquals(Math.min(a, b), MathUtils.min(a, b));
}
for (int i = 0; i < RAND_ITERS; i++) {
float a = r.nextFloat() * MAX - MAX / 2;
assertEquals(Math.round(a), MathUtils.round(a));
}
for (int i = 0; i < RAND_ITERS; i++) {
float a = r.nextFloat() * MAX - MAX / 2;
assertEquals(Math.abs(a), MathUtils.abs(a));
}
}
public void testVec2() {
Vec2 v = new Vec2();
v.x = 0;
v.y = 1;
v.subLocal(new Vec2(10, 10));
assertEquals(-10f, v.x);
assertEquals(-9f, v.y);
Vec2 v2 = v.add(new Vec2(1, 1));
assertEquals(-9f, v2.x);
assertEquals(-8f, v2.y);
assertFalse(v.equals(v2));
}
public void testMat22Unsafes() {
Vec2 v1 = new Vec2(10, -1.3f);
Mat22 m1 = new Mat22(1, 34, -3, 3);
Mat22 m2 = new Mat22(2, -1, 4.1f, -4);
Vec2 vo = new Vec2();
Mat22 mo = new Mat22();
Mat22.mulToOutUnsafe(m1, m2, mo);
assertEquals(Mat22.mul(m1, m2), mo);
Mat22.mulToOutUnsafe(m1, v1, vo);
assertEquals(Mat22.mul(m1, v1), vo);
Mat22.mulTransToOutUnsafe(m1, m2, mo);
assertEquals(Mat22.mulTrans(m1, m2), mo);
Mat22.mulTransToOutUnsafe(m1, v1, vo);
assertEquals(Mat22.mulTrans(m1, v1), vo);
}
public void testMat33() {
Mat33 mat = new Mat33();
mat.ex.set(3, 19, -5);
mat.ey.set(-1, 1, 4);
mat.ez.set(-10, 4, 4);
Vec3 b = new Vec3(4, 1, 2);
assertEquals(new Vec3(0.096f, 1.1013334f, -.48133332f), mat.solve33(b));
Vec2 b2 = new Vec2(4, 1);
assertEquals(new Vec2(0.22727273f, -3.318182f), mat.solve22(b2));
}
public void testVec3() {
Vec3 v1 = new Vec3();
Vec3 v2 = new Vec3();
assertEquals(new Vec3(1, -15, 36), Vec3.cross(v1.set(9, 3, 1), v2.set(3, 5, 2)));
}
}