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Particle explosion in javascript canvas
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| function degreeToRadians(value){ | |
| return (value/360)*2*Math.PI; | |
| } |
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <title> | |
| Test Demo | |
| </title> | |
| <style type="text/css"> | |
| html, body { | |
| margin: 0px; | |
| } | |
| canvas { | |
| display: block; | |
| } | |
| </style> | |
| <script type="text/javascript" src="geom_conversions.js"></script> | |
| <script type="text/javascript" src="vector.js"></script> | |
| <script type="text/javascript" src="particles.js"></script> | |
| <script type="text/javascript"> | |
| window.onload=function(){ | |
| canvas=document.getElementById("canvas"); | |
| context=canvas.getContext("2d"); | |
| width=canvas.width=window.innerWidth; | |
| height=canvas.height=window.innerHeight; | |
| /*position=vector.create(100,500); | |
| velocity=vector.create(0,0); | |
| velocity.setLength(10); | |
| velocity.setAngle(degreeToRadians(135)) | |
| console.log(position)*/ | |
| particles=[]; | |
| numparticles=500; | |
| for(i=0;i<numparticles;i++){ | |
| particles.push(particle.create(width/2,height/2,(Math.random()*10)+1,Math.random()*Math.PI*2)) | |
| } | |
| update(); | |
| function update(){ | |
| context.clearRect(0,0,width,height); | |
| /*position.addTo(velocity); | |
| context.arc(position.getX(),position.getY(),10,0,2*Math.PI,false); | |
| */ | |
| for (var i = 0; i < numparticles; i++) { | |
| particles[i].update(); | |
| context.beginPath(); | |
| context.arc(particles[i].position.getX(),particles[i].position.getY(),3,0,2*Math.PI,false); | |
| context.fill(); | |
| } | |
| requestAnimationFrame(update); | |
| } | |
| } | |
| </script> | |
| </head> | |
| <body> | |
| <canvas id="canvas"> | |
| </canvas> | |
| </body> | |
| </html> |
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| particle= | |
| { | |
| velocity :null, | |
| position : null, | |
| /// dummy constructor | |
| create : function(x,y,speed,angle) | |
| { | |
| console.log(x,y,speed,angle) | |
| var obj=Object.create(this); | |
| obj.velocity=vector.create(0,0); | |
| obj.velocity.setLength(speed); | |
| obj.velocity.setAngle(angle); | |
| obj.position=vector.create(x,y); | |
| console.log("object") | |
| console.log(obj); | |
| return obj; | |
| }, | |
| update: function(){ | |
| this.position.addTo(this.velocity); | |
| } | |
| } |
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| vector= | |
| { | |
| _x:0, | |
| _y:0, | |
| // dummy constructor | |
| create : function(x,y){var obj= Object.create(this);obj._y=y; obj._x=x; return obj;}, | |
| // member functions | |
| getX : function(){ return this._x}, | |
| getY : function(){ return this._y}, | |
| setX : function(value){ this._x=value;}, | |
| setY : function(value){ this._y=value;}, | |
| getLength : function(){ return Math.sqrt(this._x*this._x + this._y*this._y)}, | |
| getAngle : function(){ return Math.atan2(this._y,this._x) }, | |
| setAngle : function(angle){ length=this.getLength(); this._y =Math.cos(angle)*length; this._x= Math.sin(angle)*length; }, | |
| setLength: function(length){ angle=this.getAngle(); this._y=Math.cos(angle)*length; this._x=Math.sin(angle)*length; }, | |
| add : function(v2){ vect = this.create(this._x+v2._x, this._y+v2._y); return vect; }, | |
| subtract : function(v2){ vect = this.create(this._x-v2._x, this._y-v2._y); return vect; }, | |
| multiply: function(value){ return vector.create(this._x*value,this._y*value)}, | |
| divide: function(value){ return vector.create(this._x/value,this._y/value)}, | |
| scale: function(value){ this._x=this._x*value; this._y=this._y*value;}, | |
| addTo: function(v2){ this._x=this._x+v2._x; this._y=this._y+v2._y }, | |
| subtractFrom: function(v2){ this._x=this._x-v2._x; this._y=this._y-v2._y } | |
| } |
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