Last active
August 29, 2015 14:07
-
-
Save ebhoren/5938d311ee7944c9ca93 to your computer and use it in GitHub Desktop.
Comme des bêtes- Ribbons animation 1
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
var canvas = document.getElementById('canvas'), | |
source = document.createElement('canvas'), | |
width = window.innerWidth, | |
height = window.innerHeight, | |
context = canvas.getContext('2d'), | |
path1x = 0.0, | |
path2x = 0.0; | |
function init(){ | |
resize(); | |
window.addEventListener('resize', resize); | |
window.requestAnimationFrame( render ); | |
}; | |
function drawRibbon(){ | |
var c = source.getContext('2d'); | |
c.lineWidth = 3; | |
c.shadowBlur = 8; | |
c.shadowColor = '#D00204'; | |
c.strokeStyle = '#D00204'; | |
c.save(); | |
c.beginPath(); | |
c.moveTo( width * -0.2, height * 0.5 ); | |
c.quadraticCurveTo( width * (( -0.2 + 0.5 ) * 0.5), Math.sin(360) * 375.0 + height * 0.5, width * 0.5, height * 0.5 ); | |
c.quadraticCurveTo( width * (( 1.0 + 0.2 - 0.5 ) * 0.5 + 0.5), Math.sin(-360) * 375.0 + height * 0.5, width * 0.2 + width, height * 0.5 ); | |
c.stroke(); | |
c.closePath(); | |
}; | |
function resize(){ | |
width = window.innerWidth; | |
height = window.innerHeight; | |
source.width = width; | |
source.height = height; | |
canvas.width = width; | |
canvas.height = height; | |
drawRibbon(); | |
}; | |
function render(){ | |
context.save(); | |
context.clearRect(0,0,width,height); | |
context.drawImage(source, -width + width * path1x, 0); | |
context.scale(1.0, -1.0); | |
context.drawImage(source, -width + width * path2x, -height); | |
path1x += 0.01; | |
path2x += 0.01; | |
if( path1x > 1.0 ) path1x = 0.0; | |
if( path2x > 1.0 ) path2x = 0.0; | |
window.requestAnimationFrame( render ); | |
}; | |
init(); |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment