Rising from curved space by rodrigo.siqueira

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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rodrigo.siqueira

remix of d/23443 by u/danny@hille.dk

function u(t) {

for(c.width=w=512,d=new ImageData(w,w),m=w*w,i=-1;m--;d.data[i+=4]=T(m/w/r+t*30|X/r)*w)r=((X=m%w-256)*X+m*m/2e5)/3e4
x.putImageData(d,0,0)

Aug 1 2021 4:28 PM UTC

}// 138/140

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Rising from curved space

u/Xen

very nicely
u/Toby

Lovely! How can you use r in the loop header without first defining it (done in the loop body)?
u/danny@hille.dk

Creative use of geme mechanics :-) The for loop has 3 sections separated with semicolons, first is for initializing: this is runs once before the loop starts, second is exit conditions: runs for every iteration before the "loop scope", third is for incrementation: this part actually first run after the loop scope. EX: for(i=9;i--;console.log(j))j=i*2 i is initalized to 9 i is decremented if i equals 0 (any number in js is evaluated to true except 0 wich is false) the loop exist then the j is set to two times i in "loop scope" finally j is printet to the console


      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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