Hot dweets by u/18sp01

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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18sp01

remix of d/3760 by u/sadropol

function u(t) {

c.width|=0;for(i=1;i<140;i++){b=2*t+i;o=200-(S(b+5)*100)%256;x.fillStyle=R(1,o,0,1);x.fillRect(940+((i/80)%1)*S(b)*200,400+i*6%500,9,8);}

Dec 27 2017 1:57 AM UTC

}// 138/140

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18sp01

remix of d/3812 by u/18sp01

function u(t) {

c.width=1920;
x.fillStyle=R(255,5,240,0.5);
  for(i=0;i<10;i++){
  x.fillRect(i*120+T(t)*400, 500, 20, 200);}

Dec 27 2017 2:30 AM UTC

}// 109/140

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18sp01

function u(t) {

c.width=1920;
  for(i=0;i<10;i++){
  x.fillRect(i*120+T(t)*400, 500, 20, 200);
x.fillStyle=R(255,5,240,0.5)}

Dec 27 2017 2:08 AM UTC

}// 108/140

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How do I make the first bar pink as well?

u/sigveseb

You need to make sure you set fillStyle before you call fillRect. The canvas context is stateful like that, it remembers the active fillStyle and uses it for all subsequent fill calls until it is set to something else. The default fillStyle after reseting a canvas is black, which is why the first bar is black here :)
u/18sp01

@sigveseb Thank you!

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