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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.

function u(t) {

}//
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  • joeytwiddle: Moody and cloudy: x.arc(S(t*6+i*i/99e2)*i/4+960,C(t*6+i*i/99e2)*i/4+540,i/30+2,0,7),x.fill()
  • joeytwiddle: Eye of the storm: t=9+t/5e2;for(c.width|=0,i=4e3;i--;x.beginPath())x.globalAlpha=.03,x.arc(S(i*i/1e4*t)*i/4+960,C(i*i/1e4*t)*i/4+540,i/30+2,0,7),x.fill()

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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)