112 lines
1.6 KiB
JavaScript
112 lines
1.6 KiB
JavaScript
(function(global){ 'use strict';
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var Vector = function(x, y){
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this.x = x || 0;
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this.y = y || 0;
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};
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Vector.prototype = {
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clone: function(){
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return new Vector(this.x, this.y);
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},
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add: function(vec){
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this.x += vec.x;
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this.y += vec.y;
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return this;
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},
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sub: function(vec){
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this.x -= vec.x;
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this.y -= vec.y;
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return this;
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},
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subVal: function(val){
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this.x -= val;
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this.y -= val;
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return this;
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},
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mult: function(mul){
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this.x *= mul;
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this.y *= mul;
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return this;
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},
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div: function(div){
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if (div === 0) {
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return this;
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}
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this.x /= div;
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this.y /= div;
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return this;
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},
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mag: function(){
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return Math.sqrt(
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this.x * this.x +
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this.y * this.y
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);
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},
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limit: function(max){
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if (this.mag() > max) {
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this.normalize();
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this.mult(max);
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}
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return this;
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},
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normalize: function(){
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var mag = this.mag();
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if (mag === 0) {
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return this;
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}
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this.div(mag);
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return this;
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},
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heading: function(){
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return Math.atan2(this.y, this.x);
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},
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set: function(vec){
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this.x = vec.x;
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this.y = vec.y;
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return this;
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}
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};
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Vector.add = function(vec1, vec2){
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return vec1.clone().add(vec2.clone());
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};
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Vector.sub = function(vec1, vec2){
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return vec1.clone().sub(vec2.clone());
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};
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Vector.mult = function(vec, mult){
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return vec.clone().mult(mult);
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};
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Vector.div = function(vec, div){
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return vec.clone().div(div);
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};
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// Ripped from processing
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Vector.random2D = function(){
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var angle = Math.random(0, 1) * Math.PI * 2;
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return new Vector(Math.cos(angle), Math.sin(angle));
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};
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Vector.coerce = function(obj){
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return new Vector(obj.x, obj.y);
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};
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global.Vector = Vector;
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})(this);
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