Top dweets of all time

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.

Try the new frontend: beta.dwitter.net
Current theme challenge: #Food

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rjro

remix of d/7694 by u/firegodjr

function u(t) {

c.width=1920,x.globalAlpha=0.1
for(y=41;--y;){x.fill();x.beginPath();for(w=99;--w+1;){x.lineTo(30*w,S(t+y/4+(S(t/6)+1.1)*w/3)*12+30*y-75)}}

Apr 22 2018 10:26 AM UTC

}// 139/140

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u/joeytwiddle

#waves

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anthonylewis

remix of d/7659 by u/New_Core

function u(t) {

w=c.width^=0
for(i=30;i--;)
Z=w/(i-t%2+1),x.rect(-Z/2+960,-Z/2+540,Z,Z),x.stroke()

Apr 20 2018 12:16 AM UTC

}// 82/140

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A simple tunnel to use a base for future effects (hopefully)

u/jylikangas

You can use strokeRect here. Golfed to 71b... for(w=c.width|=i=30;i--;x.strokeRect(960-Z/2,540-Z/2,Z,Z))Z=w/(i-t%2+1)
u/magna

#tunnel

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Xen

function u(t) {

x.font="599px x",x.globalCompositeOperation="difference"
x.fillText('💙',5e2+C(t*9)*99,7e2+S(t*7)*99)
x.drawImage(c,C(t*9)*199,S(t*7)*199)

Apr 18 2018 7:43 PM UTC

}// 137/140

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u/joeytwiddle

Hi Xen! 256px is the largest possible font size on this Mac
u/iverjo

#hearts

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Agnes

remix of d/7684 by u/Agnes

function u(t) {

with(x)for(c.width|=i=15;i-->1;)for(j=5;j--;beginPath(),a=6.3/j,arc(960,540,150+25*i,o=i*t-a/2,a+o),lineWidth=2*j+5,stroke());

Apr 16 2018 10:57 AM UTC

}// 126/140

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A slightly more boring version of the previous dweet with colours removed to make the circle segments wrap around each other better. There's probably a way to do colour with this.

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Galaxtone

function u(t) {

for(i=0;i<10;i++){x.fillStyle=R(S(t)*255,C(t)*255);x.beginPath();
x.ellipse(400+i*99+S(t)*300,S(t)*99+400,50,C(t)*99+200,0,0,3,1);x.fill();}

Apr 16 2018 12:39 AM UTC

}// 140/140

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141/140 I broke the matrix

u/prplz

When the order of your for loop isn't important you can make it count backwards like this for(i=10;i--;)
u/Galaxtone

oh nice thx for the tip I'm new to this code-golfing site
u/Galaxtone

also I saw something about using with(x) so I think I'll use that for future stuff :p
u/Galaxtone

for(i=10;i--;)with(x){fillStyle=R(S(t)*255,C(t)*255);beginPath(); ellipse(400+i*99+S(t)*300,S(t)*99+400,50,C(t)*99+200,0,0,3,1);fill()} Saved 5 whole bytes using that

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BoredKid

function u(t) {

c.width=1920
h=c.height
for(i=0;i<800;i++){
x.fillRect(1920*i/800,((500*S(i*30))+(t*1920*S(i))+t%h)%h,5*S(2*i),50*S(4*i));
}

Apr 15 2018 6:35 PM UTC

}// 124/140

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dragon7076

function u(t) {

P=Math.PI*2/3
x.fillStyle = R(S(t)*255,S(t-P)*255,(S(t+P))*255);
for(i=1;i<10;i++)
x.fillRect(960+i*99*C(t),10*t+i*99*S(2*t),10,10)

Apr 10 2018 1:20 PM UTC

}// 131/140

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Colour version

u/Galaxtone

... colour lines!
u/Galaxtone

btw Math.PI*2/3 is about 2.094 so you can just remove the P line and replace P with 2 and get the same effect, saving 14 bytes.

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function u(t) {

t?d=x.createImageData(w,1):c.width=w=512
for(i=0;i<w*4;d.data[i++]=(t*50+i*t**2)&255);
for(i=-1;i<36;x.putImageData(d,0,i++*32+t*60%32));

Apr 10 2018 10:15 AM UTC

}// 137/140

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Axioplase

function u(t) {

w=c.width=1e2;a=[];a[w/2]=t*1e3;for(i=w;i++<w*w;)b=i-w,
a[i]=d=~~a[b-1]+~~a[b]+~~a[b+1],x.fillStyle=R(d),x.fillRect(i%w,i/w|0,1,1)

Apr 7 2018 1:33 AM UTC

}// 130/140

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Ugly and slow automaton-inspired code...

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anthonylewis

function u(t) {

c.width=1920;with(x){translate(960,540);rotate(t)
beginPath();fill(arc(0,0,200,3.1,6.3))
fillRect(-150,90,90,90);fillRect(60,90,90,90)}

Apr 6 2018 3:50 AM UTC

}// 135/140

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Happy Spinning