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vec.js
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vec.js
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/*
Written by: Mark Busenitz, [email protected]
<om636/lib/
*/
(function() {
function Vec( x, y ) {
this.x = typeof x === 'undefined' ? 0 : x;
this.y = typeof y === 'undefined' ? 0 : y;
}
Vec.prototype = {
add: function( v ) {
return new Vec( this.x + v.x, this.y + v.y );
},
sub: function( v ) {
return new Vec( this.x - v.x, this.y - v.y );
},
scale: function( s ) {
return new Vec( this.x * s, this.y * s );
},
lengthSquare: function() {
return this.dot( this );
},
length: function() {
return Math.sqrt( this.lengthSquared() );
},
normalize: function() {
return this.mult( 1 / this.length() );
},
dot: function( v ) {
return this.x * v.x + this.y * v.y;
},
determinant: function( v ) {
return this.x * v.y - this.y * v.x;
},
clone: function() {
return new Vec( this.x, this.y );
}
};
Vec.Zero = new Vec();
exports.Vec = Vec;
exports.$V = function( a ) {
return instanceof a == Array ? new Vec( a[0], a[1] ) : Vec.Zero;
};
} )();