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function u(t) {
} //
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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.
Theme challenge of the month: #time
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remix of d/20898 by u/cantelope

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  • Metatron's Cube
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  • u/pavel
    end-circle-offset == 0 is easy to check and means start and end are same circle, so draw that circle.
  • u/pavel
    Otherwise draw the current circle with radius 0 which is same as lineTo.
  • u/pavel
    T=!T&&!x.beginPath(x.stroke()) starts/strokes the path every two circles.
  • u/pavel
    Here is a version before all the bit hacking for(c.width=640,i=16;i--;)for(j=16;j--;x.beginPath(x.stroke()))for(k=2;k--;)q=(i+j*k)%16,r=((q+2)/6|0)*64,x.arc(320+r*C(a=Math.PI/3*q+t),180+r*S(a),!j*32,0,7)

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  • u/rep_movsd
    If you stare a bit, you see white lines completing the circles - an optical illusion
  • u/danny@hille.dk
    save 9 bytes for(i=c.width|=0;i--;x.fillRect(660+(p>>2)*200+130*C(a=.8+(p+p/4&1||-1)*(28.4*d+3*t)),240+p%4*200+130*S(a),d,d))p=i/120|0,d=i%120/9
  • u/danny@hille.dk
    120/9 = 40/3
  • u/danny@hille.dk
    129 bytes -> for(m=120,i=c.width|=0;i--;x.fillRect(660+(p>>2)*200+m*C(a=.8+(p+p/4&1||-1)*(28.4*d+3*t)),240+p%4*200+m*S(a),d,d))d=i%m/9,p=i/m|0

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remix of d/20879 by u/pavel

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remix of d/17103 by u/pavel

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  • Quicker Blots

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remix of d/20689 by u/yonatan

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  • Generative art by Alexander Tabakov

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