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u(t) is called 60 times per second. t: Elapsed time in seconds. S: Shorthand for Math.sin. C: Shorthand for Math.cos. T: Shorthand for Math.tan. R: Function that generates rgba-strings, usage ex.: R(255, 255, 255, 0.5) c: A 1920x1080 canvas. x: A 2D context for that canvas.
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function u(t) {

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  • rnbw: my first dweet of 2019 :D

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  • 13thptr: Somewhat ambiguous because of implicit orthographic projection
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  • lionleaf: Nice! Glad to see you make a first dweet :D
  • jylikangas: Welcome! Very nice 1st Dweet! Golfed to 131b -> c.width=w=400; with(x)getImageData(fillText(font="17px Hello",0,19),0,w,j=99).data.map((e,i)=>e&&fillRect(j*C(i%w/63-t)+j,i/w,3,3))
  • 13thptr: thanks for the nice comments ! u/jylikangas cool tricks but it seems like inlining fillText in getImageData won't work in FF :(

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remix of d/8910 by u/DataMeta

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  • f8f82804: this dweet uses a better perspective transform based on Math.hypot -- #hypot
  • f8f82804: The projection still isn't perfect, because I'm rotating the sphere's axis towards the viewer by positioning it below the camera. The resulting distortion is approximately corrected by scaling the Y coordinate with /.9.
  • f8f82804: #perspective

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