Created
October 30, 2011 14:09
-
-
Save huljas/1325930 to your computer and use it in GitHub Desktop.
Fork Me in GitHub - Sun with canvas
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
<html> | |
<head> | |
<title>ForkMeSun</title> | |
<link href='http://fonts.googleapis.com/css?family=Dorsa' rel='stylesheet' type='text/css'> | |
</head> | |
<body> | |
<a href="http://huljas.github.com"> | |
<canvas id="forkMe" width="150" height="150"> | |
</canvas> | |
</a> | |
<script> | |
var ctx; | |
var canvasObj; | |
var fps = 12; | |
var stars = []; | |
var Animation = { | |
init : function(id) { | |
canvasObj = document.getElementById(id); | |
if (canvasObj.getContext) { | |
ctx = canvasObj.getContext("2d"); | |
} | |
if (ctx) { | |
var speed = 0.5; | |
var outer = new Star(30, 75, 75, 0, 70, 62, 0, 0, speed, "#443", "#eea", 1); | |
stars.push(outer); | |
var inner = new Star(30, 75, 75, 0, 60, 54, 0, 0, -speed, "#ddb", "#ffd", 2); | |
stars.push(inner); | |
img = new Image() | |
img.addEventListener('load', function(e) { | |
Animation.draw(); | |
setInterval(Animation.draw, 1000/fps); | |
}, true); | |
img.src="bg-page-2.png" | |
} | |
}, | |
draw: function() { | |
ctx.fillStyle = ctx.createPattern(img, 'repeat') | |
ctx.fillRect(0, 0, canvasObj.width, canvasObj.height); | |
ctx.strokeStyle = "#b0b0ff"; | |
ctx.lineWidth = 1; | |
ctx.fillStyle = "#ccccff"; | |
for (i in stars) { | |
stars[i].draw(ctx); | |
} | |
ctx.save(); | |
ctx.lineWidth = 1; | |
ctx.fillStyle = '#fff'; | |
ctx.strokeStyle = "#000"; | |
ctx.font = "32px 'Dorsa'"; | |
ctx.textBaseline = 'middle'; | |
ctx.shadowOffsetX = 2; | |
ctx.shadowOffsetY = 2; | |
ctx.shadowBlur = 2; | |
ctx.shadowColor = "rgba(0, 0, 0, 0.8)"; | |
ctx.rotate(-Math.PI*2/8); | |
ctx.fillStyle = '#26d'; | |
ctx.fillText('Fork me on GitHub', -48, 103); | |
ctx.restore(); | |
}, | |
drawStar : function(ctx, points, x, y, outR, inR, rotation) { | |
ctx.beginPath(); | |
for (var i = 0; i < points*2; i++) { | |
var radians = rotation + i * Math.PI/points; | |
var radius = i % 2 == 0 ? outR : inR; | |
var _x = x + Math.cos(radians) * radius; | |
var _y = y + Math.sin(radians) * radius; | |
if (i == 0) { | |
ctx.moveTo(_x, _y); | |
} else { | |
ctx.lineTo(_x, _y); | |
} | |
} | |
ctx.closePath(); | |
ctx.fill(); | |
ctx.stroke(); | |
} | |
}; | |
function Star(points,x,y,rotation,outR,inR,vx,vy,vr,stroke,fill,lineWidth) { | |
this.points = points; | |
this.x = x; | |
this.y = y; | |
this.outR = outR; | |
this.inR = inR; | |
this.rotation = rotation; | |
this.vx = vx; | |
this.vy = vy; | |
this.vr = vr; | |
if (stroke) this.stroke = stroke; | |
else this.stroke = "#000000"; | |
if (fill) this.fill = fill; | |
else this.fill = "#ffffff"; | |
if (lineWidth) this.lineWidth = lineWidth; | |
else this.lineWidth = 1; | |
this.draw = function(ctx) { | |
ctx.strokeStyle = this.stroke; | |
ctx.lineWidth = this.lineWidth; | |
ctx.fillStyle = this.fill; | |
this.x += this.vx / fps; | |
this.y += this.vy / fps; | |
this.rotation += this.vr / fps; | |
if (this.x - this.outR > canvasObj.width) this.x = 0 - this.outR; | |
if (this.x + this.outR < 0) this.x = canvasObj.width + this.outR; | |
if (this.y - this.outR > canvasObj.height) this.y = 0 - this.outR; | |
if (this.y + this.outR < 0) this.y = canvasObj.height + this.outR; | |
Animation.drawStar(ctx, points, this.x, this.y, this.outR, this.inR, this.rotation); | |
}; | |
} | |
</script> | |
<script> | |
Animation.init("forkMe"); | |
</script> | |
</body> | |
</html> |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment