Created
April 15, 2014 21:14
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canvas tut
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<!DOCTYPE html> | |
<html> | |
<head> | |
<title></title> | |
</head> | |
<body> | |
<canvas id="c"></canvas> | |
<script> | |
var canvas = document.getElementById("c"); | |
var ctx = canvas.getContext("2d"); | |
canvas.width = window.innerWidth - 30; | |
canvas.height = window.innerHeight - 60; | |
var electron1 = new electron(canvas.width/2,canvas.height/2 - 50,15,'green'); | |
var frameMovement = 10; | |
setInterval(animate, 1); | |
function electron (x,y,r, color) { | |
this.x = x; | |
this.y = y; | |
this.r = r; | |
this.color = color; | |
this.theta = 0; | |
this.center = {x: canvas.width/2, y: canvas.height/2}; | |
this.majorAxis = {x: 50, y: 50}; | |
this.minorAxis = {x: 50, y: 50}; | |
this.frame = 0; | |
this.frameMax = 20; | |
this.draw = function(){ | |
ctx.beginPath(); | |
ctx.arc(this.x, this.y, this.r, 0, 2 * Math.PI, false); | |
ctx.fillStyle = this.color; | |
ctx.fill(); | |
ctx.lineWidth = 3; | |
ctx.strokeStyle = 'black'; | |
ctx.stroke(); | |
} | |
this.animate = function(){ | |
if(this.frame>this.frameMax){ | |
this.x = this.center.x + this.majorAxis.x * Math.sin(this.theta) + this.minorAxis.x*Math.cos(this.theta); | |
this.y = this.center.y + this.majorAxis.y * Math.sin(this.theta) + this.minorAxis.y*Math.cos(this.theta); | |
this.theta++; | |
} | |
this.frame = (this.frame+1)%this.frameMax+2; | |
} | |
} | |
function fontStyle () { | |
ctx.fillStyle = "rgb(0,0,0)"; | |
ctx.font = "100px Helvetica"; | |
ctx.textAlign = "center"; | |
ctx.textBaseline = "top"; | |
} | |
function animate () { | |
ctx.clearRect(0,0,canvas.width, canvas.height); | |
electron1.draw(); | |
fontStyle(); | |
ctx.fillText("Atom",canvas.width/2 , canvas.height/2); | |
electron1.animate(); | |
} | |
</script> | |
</body> | |
</html> |
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