redid my pen rainbow rain
Created
July 14, 2015 09:49
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#1 alpha revolution - rainbow rain
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<canvas id=c></canvas> |
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//initial | |
var w = c.width = window.innerWidth, | |
h = c.height = window.innerHeight, | |
ctx = c.getContext('2d'), | |
//parameters | |
total = (w/8)|0, | |
accelleration = .05, | |
lineAlpha = .02, | |
range = 25, | |
//afterinitial calculations | |
size = w/total, | |
occupation = w/total, | |
repaintColor = 'rgba(0, 0, 0, .04)' | |
colors = [], | |
dots = [], | |
dotsVel = []; | |
//setting the colors' hue | |
//and y level for all dots | |
var portion = 360/total; | |
for(var i = 0; i < total; ++i){ | |
colors[i] = portion * i; | |
dots[i] = h; | |
dotsVel[i] = 10; | |
} | |
function anim(){ | |
window.requestAnimationFrame(anim); | |
ctx.fillStyle = repaintColor; | |
ctx.fillRect(0, 0, w, h); | |
for(var i = 0; i < total; ++i){ | |
var currentY = dots[i] - 1; | |
dots[i] += dotsVel[i] += accelleration; | |
for(var j = i+1; j < i+range && j < total; ++j){ | |
if(Math.abs(dots[i] - dots[j]) <= range*size){ | |
ctx.strokeStyle = 'hsla(hue, 80%, 50%, alp)'.replace('hue', (colors[i] + colors[j] + 360)/2 - 180).replace('alp', lineAlpha); | |
ctx.beginPath(); | |
ctx.moveTo(i * occupation, dots[i]); | |
ctx.lineTo(j * occupation, dots[j]); | |
ctx.stroke(); | |
} | |
} | |
if(dots[i] > h && Math.random() < .01){ | |
dots[i] = dotsVel[i] = 0; | |
} | |
} | |
} | |
anim(); |
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canvas{ | |
position:absolute; | |
top:0; | |
left:0; | |
background-color:black; | |
} |
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