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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/40 by u/iverjo

function u(t) {

}//
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remix of d/297 by u/sigveseb

function u(t) {

}//
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  • scene change every 2 seconds

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remix of d/395 by u/iverjo

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}//
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function u(t) {

}//
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remix of d/387 by u/iverjo

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function u(t) {

}//
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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.

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function u(t) {

}//
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function u(t) {

}//
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  • u/iverjo
    Cool!
  • u/iverjo
    135 characters: for(c.width=i=256;i--;)for(j=142;j--;x.fillRect(i,j,1,k/14))for(a=b=0,k=18;k--&&b*b<4;a=q)q=a*a-b*b+i/96-2+C(t*2),b=2*a*b+j/96-1+S(t*2)

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remix of d/356 by u/maraoz

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}//
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  • If you'repatient you'll encounter some interesting patterns

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function u(t) {

}//
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  • u/iverjo
    This runs at 2-3 FPS in Firefox on my laptop because of the missing x.beginPath(). Here's a version that runs at a much higher framerate: c.width=W=400;for(h=W;h-=16;)for(v=W;v-=16;){s=7*C(t*h/200);n=7*S(t*v/200);x.beginPath();x.moveTo(h+s,v+n);x.lineTo(h-s,v-n);x.stroke()}
  • u/PhiLho
    Good to know, thanks.

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