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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: #fracture

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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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Xen

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  • u/plusright
    gotta find a more succinct way of writing for loops, this one just feels a little too dull
  • u/yonatan
    c.width=999 for(w=i=40;i--;)for(j=16;j--;)s=i%2==0?-1:1,x.fillRect(-2*w+i*2*w+S(t)*w+C(t)*-s*w,-2*w+j*2*w+(C(t)*w*s),w,w)
  • u/yonatan
    actually, the fillRect can go into the for loop's final expression, between the ; and the ) to save 2 more chars
  • u/plusright
    aha! that's clever, thanks.

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  • Generative art by Alexander Tabakov

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