Port of the Mac fractal clock screensaver, with some added animation fanciness, written using Sketch.js.
A Pen by Nick Hogle on CodePen.
Created
December 31, 2018 15:36
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Fractal Clock
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| window.ctx = Sketch.create( | |
| setup: -> | |
| @push() | |
| @MaxDepth = 6 | |
| getTime: -> | |
| now = new Date | |
| midnight = new Date(now.getFullYear(), now.getMonth(), now.getDate(), 0, 0, 0) | |
| (now.getTime() - midnight.getTime()) / 1000 | |
| getTimeFraction: (t, period) -> | |
| (t % period) / period | |
| getAngle: (f) -> | |
| f * 360 * Math.PI / 180 | |
| drawLine: (length, angle) -> | |
| @push() | |
| @beginPath() | |
| @rotate(angle) | |
| @moveTo(0, 0) | |
| @lineTo(length, 0) | |
| @stroke() | |
| @pop() | |
| drawLeg: (length, t, recurse, depth) -> | |
| if (recurse <= 0) | |
| return | |
| s = @getTimeFraction(t, 60) | |
| sleftover = t % 1 | |
| fracS = (Math.floor(s*60) + @elasticTween(sleftover)) / 60 | |
| #fracS = @getAngle(@getTimeFraction(t, 60)) | |
| fracM = @getTimeFraction(t, 60*60) | |
| fracH = @getTimeFraction(t, 60*60*12) | |
| opacity = Math.pow( 1.0 - (depth/(@MaxDepth+1)), 3.2 ) | |
| @strokeStyle = "rgba(255, 255, 255, #{opacity}" | |
| doLeg = (scale, frac) => | |
| @push() | |
| angle = @getAngle( frac ) | |
| @drawLine( length*scale, angle ) | |
| @rotate( angle ) | |
| @translate( length*scale, 0 ) | |
| @drawLeg( length*0.8, t-0.02*depth, recurse-1, depth+1 ) | |
| @pop() | |
| doLeg( 1.1, fracS ) | |
| doLeg( 1.0, fracM ) | |
| doLeg( 0.6, fracH ) | |
| elasticTween: (t) -> | |
| freq = 4.0 | |
| pow = 16.0 | |
| Math.pow(2,-pow*t) * Math.sin((t-1.0/(4*freq))*(2*Math.PI)*freq) + 1 | |
| draw: -> | |
| t = @t = @getTime() | |
| @push() | |
| @lineWidth = 2 | |
| @translate @width / 2, @height / 2 | |
| @rotate( -90 * Math.PI / 180 ) | |
| @drawLeg( Math.min(@width, @height)/@MaxDepth, t, @MaxDepth, 0 ) | |
| @pop() | |
| push: -> | |
| @save() | |
| pop: -> | |
| @restore() | |
| ) |
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| <script src="https://cdnjs.cloudflare.com/ajax/libs/sketch.js/1.0/sketch.min.js"></script> |
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| html, body | |
| height: 100% | |
| margin: 0 | |
| position: absolute | |
| background: #333 | |
| overflow: hidden |
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