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added optional output argument to Vector.rotate

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liabru 2017-04-25 23:43:29 +01:00
parent 26c1200387
commit 59d62be899
1 changed files with 8 additions and 6 deletions
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14
src/geometry/Vector.js
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@ -62,14 +62,16 @@ module.exports = Vector;
* @method rotate
* @param {vector} vector
* @param {number} angle
* @return {vector} A new vector rotated about (0, 0)
* @param {vector} [output]
* @return {vector} The vector rotated about (0, 0)
*/
Vector.rotate = function(vector, angle) {
Vector.rotate = function(vector, angle, output) {
var cos = Math.cos(angle), sin = Math.sin(angle);
return {
x: vector.x * cos - vector.y * sin,
y: vector.x * sin + vector.y * cos
};
if (!output) output = {};
var x = vector.x * cos - vector.y * sin;
output.y = vector.x * sin + vector.y * cos;
output.x = x;
return output;
};
/**