This might be a good starting point for… by iverjo

function u(t) {

c.width=1920 // clear the canvas
for(i=0;i<9;i++)
x.fillRect(400+i*100+S(t)*300,400,50,200) // draw 50x200 rects

} // 122/140

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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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iverjo

function u(t) {

for(i=7;i--;)x.fillStyle=R(a=255*!i,a,a,.02+i),r=S(t/7),x.fillRect(!a*(960+900*S(t+i)*r),!a*(515+500*C(t+i)*r),c=20+8*a,c)

Jul 29 2016 5:10 PM UTC

}// 122/140

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This might be a good starting point for creating dweets with rectangles that leave trails. For i = 0 a large, white, semi-transparent rectangle is applied to the entire canvas. For i = 1,2,3,4,5,6 small, black, opaque rectangles are drawn.

u/iverjo

#spiral


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

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