Dweets awesomed by u/jbjjbjjbj

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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Current theme challenge: #Opposites

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magna

function u(t) {

c.width=w=1920;h=1080;n=128;m=72;s=w/n;for(i=n*m;i--;X=i%n,Y=i/n,b=S(X|Y)*C(t),x.fillRect(X/n*w,Y/m*h,b*s,b*s));

Mar 17 2017 4:53 AM UTC

}// 112/140

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Faux Sierpinski

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khalkeus

remix of d/1593 by u/khalkeus

function u(t) {

v=['<・><','くコ彡','(___.))><','<・)))<<','<=<'];w=333;c.width=w;for(i=1;i<99;i++){x.fillText(v[i%5],w-((t+99)*S(i)*99)%(w*2),C(t-i)*9+i*5)}

Feb 28 2017 11:55 PM UTC

}// 136/140

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cut the code down a bunch and added up/down motion くコ彡

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iverjo

function u(t) {

t?i++:i=0;for(j=1080;j--;){a=b=0;k=35;for(;k--&&a*a+b*b<4;)c=a*a-b*b+i/1e11-1,b=Math.abs(2*a*b)+j/1e11-1,a=c;x.fillRect(i,j,1,S(k/9))}

Sep 28 2016 1:14 PM UTC

}// 134/140

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Burning ship fractal, zoomed in on an interesting point

Show more comments…
u/iverjo

128 characters: for(j=1080;j--;){a=b=0;k=35;for(;k--&&a*a+b*b<4;)c=a*a-b*b+t*6e-10-1,b=Math.abs(2*a*b)+j/1e11-1,a=c;x.fillRect(t*60,j,1,S(k/9))}
u/iverjo

127 characters: for(j=1080;j--;){a=b=0;for(k=35;k--&&a*a+b*b<4;)c=a*a-b*b+t*6e-10-1,b=Math.abs(2*a*b)+j/1e11-1,a=c;x.fillRect(t*60,j,1,S(k/9))}
u/iverjo

126 characters: for(j=1080;j--;){a=b=0;for(k=35;k--&&a*a+b*b<4;a=c)c=a*a-b*b+t*6e-10-1,b=Math.abs(2*a*b)+j/1e11-1;x.fillRect(t*60,j,1,S(k/9))}
u/donbright

speechless!!
u/iverjo

#fractal
u/iverjo

#burningship

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iverjo

function u(t) {

c.width=1920;for(j=64;j--;)for(i=120;i--;)a=1+S((i^j)/9+4*t|0),x.fillStyle=R(a*30,160-a*30,a*50+30*S(t),a/2),x.fillRect(i<<4,j<<4,16,16);

Jul 21 2016 5:28 PM UTC

}// 137/140

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u/sigveseb

woop, the gameboy colors are back!
u/iverjo

\o/

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Dyno

function u(t) {

W=A=B=c.width=1920;x.fillRect(0,0,B,B);while(--W){A=B*A>>8;k=1+A%4;x.fillStyle=R(255,255,255,.2+.8/k);x.fillRect((A+t*864/k)%B,W%1080,6,6);}

Jul 19 2016 1:44 PM UTC

}// 140/140

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u/iverjo

I shaved 6 bytes: W=A=B=c.width=2e3;x.fillRect(0,0,B,B);while(--W)A=B*A>>8,k=1+A%4,x.fillStyle=R(a=255,a,a,.2+.8/k),x.fillRect((A+t*864/k)%B,W%1080,6,6)
u/iverjo

A related dweet: http://dweet.dwitter.net/id/81?autoplay=1
u/Dyno

Thanks for the tips, iverjo !

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