1 /**
  2  * @author mrdoob / http://mrdoob.com/
  3  * @author philogb / http://blog.thejit.org/
  4  * @author egraether / http://egraether.com/
  5  * @author zz85 / http://www.lab4games.net/zz85/blog
  6  */
  7 
  8 /**@constructor*/
  9 THREE.Vector2 = function ( x, y ) {
 10 
 11 	this.x = x || 0;
 12 	this.y = y || 0;
 13 
 14 };
 15 
 16 THREE.Vector2.prototype = {
 17 
 18 	constructor: THREE.Vector2,
 19 
 20 	set: function ( x, y ) {
 21 
 22 		this.x = x;
 23 		this.y = y;
 24 
 25 		return this;
 26 
 27 	},
 28 
 29 	copy: function ( v ) {
 30 
 31 		this.x = v.x;
 32 		this.y = v.y;
 33 
 34 		return this;
 35 
 36 	},
 37 
 38 	add: function ( a, b ) {
 39 
 40 		this.x = a.x + b.x;
 41 		this.y = a.y + b.y;
 42 
 43 		return this;
 44 
 45 	},
 46 
 47 	addSelf: function ( v ) {
 48 
 49 		this.x += v.x;
 50 		this.y += v.y;
 51 
 52 		return this;
 53 
 54 	},
 55 
 56 	sub: function ( a, b ) {
 57 
 58 		this.x = a.x - b.x;
 59 		this.y = a.y - b.y;
 60 
 61 		return this;
 62 
 63 	},
 64 
 65 	subSelf: function ( v ) {
 66 
 67 		this.x -= v.x;
 68 		this.y -= v.y;
 69 
 70 		return this;
 71 
 72 	},
 73 
 74 	multiplyScalar: function ( s ) {
 75 
 76 		this.x *= s;
 77 		this.y *= s;
 78 
 79 		return this;
 80 
 81 	},
 82 
 83 	divideScalar: function ( s ) {
 84 
 85 		if ( s ) {
 86 
 87 			this.x /= s;
 88 			this.y /= s;
 89 
 90 		} else {
 91 
 92 			this.set( 0, 0 );
 93 
 94 		}
 95 
 96 		return this;
 97 
 98 	},
 99 
100 	negate: function() {
101 
102 		return this.multiplyScalar( - 1 );
103 
104 	},
105 
106 	dot: function ( v ) {
107 
108 		return this.x * v.x + this.y * v.y;
109 
110 	},
111 
112 	lengthSq: function () {
113 
114 		return this.x * this.x + this.y * this.y;
115 
116 	},
117 
118 	length: function () {
119 
120 		return Math.sqrt( this.lengthSq() );
121 
122 	},
123 
124 	normalize: function () {
125 
126 		return this.divideScalar( this.length() );
127 
128 	},
129 
130 	distanceTo: function ( v ) {
131 
132 		return Math.sqrt( this.distanceToSquared( v ) );
133 
134 	},
135 
136 	distanceToSquared: function ( v ) {
137 
138 		var dx = this.x - v.x, dy = this.y - v.y;
139 		return dx * dx + dy * dy;
140 
141 	},
142 
143 	setLength: function ( l ) {
144 
145 		return this.normalize().multiplyScalar( l );
146 
147 	},
148 
149 	lerpSelf: function ( v, alpha ) {
150 
151 		this.x += ( v.x - this.x ) * alpha;
152 		this.y += ( v.y - this.y ) * alpha;
153 
154 		return this;
155 
156 	},
157 
158 	equals: function( v ) {
159 
160 		return ( ( v.x === this.x ) && ( v.y === this.y ) );
161 
162 	},
163 
164 	clone: function () {
165 
166 		return new THREE.Vector2( this.x, this.y );
167 
168 	}
169 
170 };
171 

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