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Vector2.js
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/**
* @author mrdoob / http://mrdoob.com/
* @author philogb / http://blog.thejit.org/
* @author egraether / http://egraether.com/
* @author zz85 / http://www.lab4games.net/zz85/blog
*/
THREE.Vector2 = function ( x, y ) {
this.x = x || 0;
this.y = y || 0;
};
THREE.Vector2.prototype = {
constructor: THREE.Vector2,
set: function ( x, y ) {
this.x = x;
this.y = y;
return this;
},
setX: function ( x ) {
this.x = x;
return this;
},
setY: function ( y ) {
this.y = y;
return this;
},
setComponent: function ( index, value ) {
switch( index ) {
case 0: this.x = value; break;
case 1: this.y = value; break;
default: throw new Error( "index is out of range: " + index );
}
},
getComponent: function ( index ) {
switch( index ) {
case 0: return this.x;
case 1: return this.y;
default: throw new Error( "index is out of range: " + index );
}
},
copy: function ( v ) {
this.x = v.x;
this.y = v.y;
return this;
},
addScalar: function ( s ) {
this.x += s;
this.y += s;
return this;
},
add: function ( a, b ) {
this.x = a.x + b.x;
this.y = a.y + b.y;
return this;
},
addSelf: function ( v ) {
this.x += v.x;
this.y += v.y;
return this;
},
sub: function ( a, b ) {
this.x = a.x - b.x;
this.y = a.y - b.y;
return this;
},
subSelf: function ( v ) {
this.x -= v.x;
this.y -= v.y;
return this;
},
multiplyScalar: function ( s ) {
this.x *= s;
this.y *= s;
return this;
},
divideScalar: function ( s ) {
if ( s !== 0 ) {
this.x /= s;
this.y /= s;
} else {
this.set( 0, 0 );
}
return this;
},
minSelf: function ( v ) {
if ( this.x > v.x ) {
this.x = v.x;
}
if ( this.y > v.y ) {
this.y = v.y;
}
return this;
},
maxSelf: function ( v ) {
if ( this.x < v.x ) {
this.x = v.x;
}
if ( this.y < v.y ) {
this.y = v.y;
}
return this;
},
clampSelf: function ( min, max ) {
// This function assumes min < max, if this assumption isn't true it will not operate correctly
if ( this.x < min.x ) {
this.x = min.x;
} else if ( this.x > max.x ) {
this.x = max.x;
}
if ( this.y < min.y ) {
this.y = min.y;
} else if ( this.y > max.y ) {
this.y = max.y;
}
return this;
},
negate: function() {
return this.multiplyScalar( - 1 );
},
dot: function ( v ) {
return this.x * v.x + this.y * v.y;
},
lengthSq: function () {
return this.x * this.x + this.y * this.y;
},
length: function () {
return Math.sqrt( this.x * this.x + this.y * this.y );
},
normalize: function () {
return this.divideScalar( this.length() );
},
distanceTo: function ( v ) {
return Math.sqrt( this.distanceToSquared( v ) );
},
distanceToSquared: function ( v ) {
var dx = this.x - v.x, dy = this.y - v.y;
return dx * dx + dy * dy;
},
setLength: function ( l ) {
var oldLength = this.length();
if ( oldLength !== 0 && l !== oldLength ) {
this.multiplyScalar( l / oldLength );
}
return this;
},
lerpSelf: function ( v, alpha ) {
this.x += ( v.x - this.x ) * alpha;
this.y += ( v.y - this.y ) * alpha;
return this;
},
equals: function( v ) {
return ( ( v.x === this.x ) && ( v.y === this.y ) );
},
clone: function () {
return new THREE.Vector2( this.x, this.y );
}
};