Triangles over letter idea stolen from Shirley Wu.
Last active
August 22, 2016 03:18
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A Animated I
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<!DOCTYPE html> | |
<meta charset='utf-8'> | |
<body style='background: #000;'> | |
<canvas width='960' height='960'></canvas> | |
</body> | |
<script src='//d3js.org/d3.v4.min.js'></script> | |
<script> | |
var width = 960 | |
var height = 960 | |
var canvas = d3.select('canvas').node() | |
var ctx = canvas.getContext('2d'); | |
var triangles = d3.range(screen.width < 400 ? 250 : screen.width < 600 ? 500 : 1000) | |
.map(function(d, i){ return [randomL(), randomR(), i % 2 ? randomL() : randomR()] }) | |
d3.timer(function(t){ | |
var isGrowing = (t % 10000) < 500 | |
ctx.globalCompositeOperation = 'lighter' | |
ctx.clearRect(0, 0, width, height) | |
triangles.forEach(function(d, i){ | |
d.forEach(function(d, i){ | |
var dist = Math.abs(height/2 - d.y) | |
var dx = d.s*(dist + isGrowing)/30 | |
d.x += clamp(-1.4, dx, 1.4) | |
if ( d.isL && d.x > width/2 || !d.isL && d.x < width/2){ | |
d.s = -d.s | |
d.x = width/2 | |
} | |
if (d.x < 0 || d.x > width){ | |
d.s = -d.s | |
} | |
d.y = XtoY(d.x) | |
}) | |
ctx.fillStyle = ['rgba(', | |
d[0].s < 0 ? 0 : 255, ',', | |
d[0].s > 0 ? 0 : 255, ',', | |
255, ',', | |
4/triangles.length, ')'].join('') | |
drawTriangle(d) | |
}) | |
ctx.globalCompositeOperation = 'source-over' | |
ctx.strokeStyle = '#000' | |
ctx.beginPath() | |
ctx.moveTo(width/4, height/2) | |
ctx.lineTo(width/4*3, height/2) | |
ctx.stroke() | |
}) | |
function randomL(){ | |
var x = width/4 + Math.random()*20 - 10 | |
return {x:x, y: XtoY(x), isL: true, s: (.5 - Math.random())} | |
} | |
function randomR(){ | |
var x = width/4 + Math.random()*20 - 10 + width/2 | |
return {x:x, y: XtoY(x), isL: false, s: (.5 -Math.random())} | |
} | |
function XtoY(x){ | |
return x < width/2 ? height - x*2 : x*2 - height | |
} | |
function clamp(a, b, c){ | |
return b < a ? a : b > c ? c : b | |
} | |
function drawTriangle(p){ | |
ctx.beginPath() | |
ctx.lineTo(p[0].x, p[0].y) | |
ctx.lineTo(p[1].x, p[1].y) | |
ctx.lineTo(p[2].x, p[2].y) | |
ctx.fill() | |
} | |
d3.select(self.frameElement).style('height', height + 'px'); | |
</script> |
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