vec2.min.js

(function inject(clean,precision,undef){var isArray=function(a){return Object.prototype.toString.call(a)==="[object Array]"};function Vec2(x,y){if(!(this instanceof Vec2)){return new Vec2(x,y)}if(isArray(x)){y=x[1];x=x[0]}else if("object"===typeof x&&x){y=x.y;x=x.x}this.x=Vec2.clean(x||0);this.y=Vec2.clean(y||0)}Vec2.prototype={change:function(fn){if(typeof fn==="function"){if(this.observers){this.observers.push(fn)}else{this.observers=[fn]}}else if(this.observers&&this.observers.length){for(var i=this.observers.length-1;i>=0;i--){this.observers[i](this,fn)}}return this},ignore:function(fn){if(this.observers){var o=this.observers,l=o.length;while(l--){o[l]===fn&&o.splice(l,1)}}return this},set:function(x,y,silent){if("number"!=typeof x){silent=y;y=x.y;x=x.x}if(this.x===x&&this.y===y){return this}var orig=null;if(this.observers&&this.observers.length){orig=this.clone()}this.x=Vec2.clean(x);this.y=Vec2.clean(y);if(silent!==false){return this.change(orig)}},zero:function(){return this.set(0,0)},clone:function(){return new this.constructor(this.x,this.y)},negate:function(returnNew){if(returnNew){return new this.constructor(-this.x,-this.y)}else{return this.set(-this.x,-this.y)}},add:function(vec2,returnNew){if(!returnNew){this.x+=vec2.x;this.y+=vec2.y;return this.change()}else{return new this.constructor(this.x+vec2.x,this.y+vec2.y)}},subtract:function(vec2,returnNew){if(!returnNew){this.x-=vec2.x;this.y-=vec2.y;return this.change()}else{return new this.constructor(this.x-vec2.x,this.y-vec2.y)}},multiply:function(vec2,returnNew){var x,y;if("number"!==typeof vec2){x=vec2.x;y=vec2.y}else{x=y=vec2}if(!returnNew){return this.set(this.x*x,this.y*y)}else{return new this.constructor(this.x*x,this.y*y)}},rotate:function(r,inverse,returnNew){var x=this.x,y=this.y,cos=Math.cos(r),sin=Math.sin(r),rx,ry;inverse=inverse?-1:1;rx=cos*x-inverse*sin*y;ry=inverse*sin*x+cos*y;if(returnNew){return new this.constructor(rx,ry)}else{return this.set(rx,ry)}},length:function(){var x=this.x,y=this.y;return Math.sqrt(x*x+y*y)},lengthSquared:function(){var x=this.x,y=this.y;return x*x+y*y},distance:function(vec2){var x=this.x-vec2.x;var y=this.y-vec2.y;return Math.sqrt(x*x+y*y)},normalize:function(returnNew){var length=this.length();var invertedLength=length<Number.MIN_VALUE?0:1/length;if(!returnNew){return this.set(this.x*invertedLength,this.y*invertedLength)}else{return new this.constructor(this.x*invertedLength,this.y*invertedLength)}},equal:function(v,w){if(w===undef){w=v.y;v=v.x}return Vec2.clean(v)===this.x&&Vec2.clean(w)===this.y},abs:function(returnNew){var x=Math.abs(this.x),y=Math.abs(this.y);if(returnNew){return new this.constructor(x,y)}else{return this.set(x,y)}},min:function(v,returnNew){var tx=this.x,ty=this.y,vx=v.x,vy=v.y,x=tx<vx?tx:vx,y=ty<vy?ty:vy;if(returnNew){return new this.constructor(x,y)}else{return this.set(x,y)}},max:function(v,returnNew){var tx=this.x,ty=this.y,vx=v.x,vy=v.y,x=tx>vx?tx:vx,y=ty>vy?ty:vy;if(returnNew){return new this.constructor(x,y)}else{return this.set(x,y)}},clamp:function(low,high,returnNew){var ret=this.min(high,true).max(low);if(returnNew){return ret}else{return this.set(ret.x,ret.y)}},lerp:function(vec,amount){return this.add(vec.subtract(this,true).multiply(amount),true)},skew:function(){return new this.constructor(-this.y,this.x)},dot:function(b){return Vec2.clean(this.x*b.x+b.y*this.y)},perpDot:function(b){return Vec2.clean(this.x*b.y-this.y*b.x)},angleTo:function(vec){return Math.atan2(this.perpDot(vec),this.dot(vec))},divide:function(vec2,returnNew){var x,y;if("number"!==typeof vec2){x=vec2.x;y=vec2.y}else{x=y=vec2}if(x===0||y===0){throw new Error("division by zero")}if(isNaN(x)||isNaN(y)){throw new Error("NaN detected")}if(returnNew){return new this.constructor(this.x/x,this.y/y)}return this.set(this.x/x,this.y/y)},isPointOnLine:function(start,end){return(start.y-this.y)*(start.x-end.x)===(start.y-end.y)*(start.x-this.x)},toArray:function(){return[this.x,this.y]},fromArray:function(array){return this.set(array[0],array[1])},toJSON:function(){return{x:this.x,y:this.y}},toString:function(){return"("+this.x+", "+this.y+")"},constructor:Vec2};Vec2.fromArray=function(array,ctor){return new(ctor||Vec2)(array[0],array[1])};Vec2.precision=precision||8;var p=Math.pow(10,Vec2.precision);Vec2.clean=clean||function(val){if(isNaN(val)){throw new Error("NaN detected")}if(!isFinite(val)){throw new Error("Infinity detected")}if(Math.round(val)===val){return val}return Math.round(val*p)/p};Vec2.inject=inject;if(!clean){Vec2.fast=inject(function(k){return k});if(typeof module!=="undefined"&&typeof module.exports=="object"){module.exports=Vec2}else{window.Vec2=window.Vec2||Vec2}}return Vec2})();