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<!DOCTYPE html>
<html>
<!--
Copyright 2006 The Closure Library Authors. All Rights Reserved.
Use of this source code is governed by the Apache License, Version 2.0.
See the COPYING file for details.
-->
<head>
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<title>Closure Unit Tests - goog.math.Vec2</title>
<script src="../base.js"></script>
<script>
goog.require('goog.math.Coordinate');
goog.require('goog.math.Vec2');
goog.require('goog.testing.jsunit');
</script>
</head>
<body>
<script>
function assertVectorEquals(a, b) {
assertTrue(b + ' should be equal to ' + a, goog.math.Vec2.equals(a, b));
}
function testVec2() {
var v = new goog.math.Vec2(3.14, 2.78);
assertEquals(3.14, v.x);
assertEquals(2.78, v.y);
}
function testRandomUnit() {
var a = goog.math.Vec2.randomUnit();
assertRoughlyEquals(1.0, a.magnitude(), 1e-10);
}
function testRandom() {
var a = goog.math.Vec2.random();
assertTrue(a.magnitude() <= 1.0);
}
function testClone() {
var a = new goog.math.Vec2(1, 2);
var b = a.clone();
assertEquals(a.x, b.x);
assertEquals(a.y, b.y);
}
function testMagnitude() {
var a = new goog.math.Vec2(0, 10);
var b = new goog.math.Vec2(3, 4);
assertEquals(10, a.magnitude());
assertEquals(5, b.magnitude());
}
function testSquaredMagnitude() {
var a = new goog.math.Vec2(-3, -4);
assertEquals(25, a.squaredMagnitude());
}
function testScale() {
var a = new goog.math.Vec2(1, 2);
a.scale(0.5);
assertEquals(0.5, a.x);
assertEquals(1, a.y);
}
function testInvert() {
var a = new goog.math.Vec2(3, 4);
a.invert();
assertEquals(-3, a.x);
assertEquals(-4, a.y);
}
function testNormalize() {
var a = new goog.math.Vec2(5, 5);
a.normalize();
assertRoughlyEquals(1.0, a.magnitude(), 1e-10);
}
function testAdd() {
var a = new goog.math.Vec2(1, -1);
a.add(new goog.math.Vec2(3, 3));
assertVectorEquals(new goog.math.Vec2(4, 2), a);
}
function testSubtract() {
var a = new goog.math.Vec2(1, -1);
a.subtract(new goog.math.Vec2(3, 3));
assertVectorEquals(new goog.math.Vec2(-2, -4), a);
}
function testRotate() {
var a = new goog.math.Vec2(1, -1);
a.rotate(Math.PI / 2);
assertRoughlyEquals(1, a.x, 0.000001);
assertRoughlyEquals(1, a.y, 0.000001);
a.rotate(-Math.PI);
assertRoughlyEquals(-1, a.x, 0.000001);
assertRoughlyEquals(-1, a.y, 0.000001);
}
function testRotateAroundPoint() {
var a = goog.math.Vec2.rotateAroundPoint(
new goog.math.Vec2(1, -1), new goog.math.Vec2(1, 0), Math.PI / 2);
assertRoughlyEquals(2, a.x, 0.000001);
assertRoughlyEquals(0, a.y, 0.000001);
}
function testEquals() {
var a = new goog.math.Vec2(1, 2);
assertFalse(a.equals(null));
assertFalse(a.equals(new goog.math.Vec2(1, 3)));
assertFalse(a.equals(new goog.math.Vec2(2, 2)));
assertTrue(a.equals(a));
assertTrue(a.equals(new goog.math.Vec2(1, 2)));
}
function testSum() {
var a = new goog.math.Vec2(0.5, 0.25);
var b = new goog.math.Vec2(0.5, 0.75);
var c = goog.math.Vec2.sum(a, b);
assertVectorEquals(new goog.math.Vec2(1, 1), c);
}
function testDifference() {
var a = new goog.math.Vec2(0.5, 0.25);
var b = new goog.math.Vec2(0.5, 0.75);
var c = goog.math.Vec2.difference(a, b);
assertVectorEquals(new goog.math.Vec2(0, -0.5), c);
}
function testDistance() {
var a = new goog.math.Vec2(3, 4);
var b = new goog.math.Vec2(-3, -4);
assertEquals(10, goog.math.Vec2.distance(a, b));
}
function testSquaredDistance() {
var a = new goog.math.Vec2(3, 4);
var b = new goog.math.Vec2(-3, -4);
assertEquals(100, goog.math.Vec2.squaredDistance(a, b));
}
function testVec2Equals() {
assertTrue(goog.math.Vec2.equals(null, null));
assertFalse(goog.math.Vec2.equals(null, new goog.math.Vec2()));
var a = new goog.math.Vec2(1, 3);
assertTrue(goog.math.Vec2.equals(a, a));
assertTrue(goog.math.Vec2.equals(a, new goog.math.Vec2(1, 3)));
assertFalse(goog.math.Vec2.equals(1, new goog.math.Vec2(3, 1)));
}
function testDot() {
var a = new goog.math.Vec2(0, 5);
var b = new goog.math.Vec2(3, 0);
assertEquals(0, goog.math.Vec2.dot(a, b));
var c = new goog.math.Vec2(-5, -5);
var d = new goog.math.Vec2(0, 7);
assertEquals(-35, goog.math.Vec2.dot(c, d));
}
function testLerp() {
var a = new goog.math.Vec2(0, 0);
var b = new goog.math.Vec2(10, 10);
for (var i = 0; i <= 10; i++) {
var c = goog.math.Vec2.lerp(a, b, i / 10);
assertEquals(i, c.x);
assertEquals(i, c.y);
}
}
function testToString() {
testEquals('(0, 0)', new goog.math.Vec2(0, 0).toString());
}
</script>
</body>
</html>
|
