Dweets awesomed by u/alasher

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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DNA

function u(t) {

c.width=1920;j=Math.PI/45;for(i=b=540;i++<630;){x.fillRect(b,b+S(t)*300,b,9);x.translate(960-960*C(j)+b*S(j),b-b*C(j)-960*S(j));x.rotate(j)}

Dec 27 2017 3:32 AM UTC

}// 140/140

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Minimizing to 140 characters was far harder than it should've been.

u/iverjo

If you look at some of the other well-golfed dweets, you'll pick up some tricks that can help in the byte-shaving process
u/iverjo

c.width+=0;for(i=b=540;i++<630;)x.fillRect(b,b+S(t)*300,b,9),x.translate(960-960*C(j=.0698)+b*S(j),b-b*C(j)-960*S(j)),x.rotate(j)

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sarah256

remix of d/3713 by u/bobdunn

function u(t) {

c.width=1920;
for(j=0;j<5;j++){
  for(i=0;i<64;i++){
  x.fillRect(150+400*j + S(4*t+(i*3))*100, i*30, 5, 600);}}

Dec 27 2017 2:51 AM UTC

}// 112/140

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snail

function u(t) {

x.drawImage(c,10,10,1900,1060,0,0,1920,1080)
x.fillRect(950+70*S(t*2),530+70*C(t*3),20,20)
t=S(t)*127+127
x.fillStyle=R(t,t,t,1)

Dec 27 2017 12:07 AM UTC

}// 128/140

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alasher

function u(t) {

c.width^=0;w=970;h=540;for(i=t;i<t+6.3;i+=0.53){x.moveTo(w+h/1.5*C(i),h+h*S(i));x.lineTo(w+h/1.5*C(t+0.5),h+h/4*S(t+0.5));x.stroke()}

Dec 26 2017 10:32 PM UTC

}// 133/140

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lionleaf

remix of d/616 by u/lionleaf

function u(t) {

c.width=2e3;x.translate(970,400);for(i=25;i--;)x.fillStyle='hsl('+i*9+',50%,50%)',x.transform(-S(t*2),T(t),S(t),1,0,0),x.fillRect(i,i,i,i*9)

Jan 14 2017 4:50 PM UTC

}// 140/140

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