Dweets awesomed by u/Froff

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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julie

remix of d/124 by u/julie

function u(t) {

c.width=1920;for(i=0;i<900;i++){x.fillStyle=R(i/3,0,255);x.fillRect(100+S(i*t)*3000,100+i,90*C(t),90)}

Apr 14 2016 4:25 PM UTC

}// 102/140

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icecuber

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/540-2,b=2*a*b+j/540-1,a=c;x.fillRect(i,j,1,S(k/9))}

Apr 13 2016 1:46 PM UTC

}// 122/140

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u/iverjo

115 bytes: for(j=1080;j--;a=b=0){for(k=35;k--&&a*a+b*b<4;a=y)y=a*a-b*b+t*60/540-2,b=2*a*b+j/540-1;x.fillRect(t*60,j,1,S(k/9))}
u/iverjo

Here's one that draws faster: for(i=4;i--;){for(j=1080;j--;a=b=0){for(k=35;k--&&a*a+b*b<4;a=y,l=t*240+i)y=a*a-b*b+l/540-2,b=2*a*b+j/540-1;x.fillRect(l,j,1,S(k/9))}}
u/iverjo

Nvm, they depend on various variables being defined. I was fooled.
u/myJS

How about colors? 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/540-2,b=2*a*b+j/540-1,a=c;x.fillStyle=R(k,j,i);x.fillRect(i,j,1,S(k/9))}
u/sfz

Nice enhancement myJS!
u/lionleaf

#scanline #slow_render #fractal #fractals

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iverjo

function u(t) {

c.width=2e3;for(i=8e3;i--;)p=3*t+i/9e3+i%4/.637,d=C(p)-S(p),d>0&&x.fillRect(999+149*S(p)+790*S(t+i/9e3+i%3*4.5),i/6-2,149*d,2/(d+1))

Feb 21 2016 8:54 PM UTC

}// 132/140

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Twisters dancing through each other

u/iverjo

#twister

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iverjo

function u(t) {

c.width=2e3;for(i=4e3;i--;)s=15/(S(i/42)*S(2.79*i+t-1.57)+2),x.fillRect(960+500*S(i/42)*S(2.79*i+t),560+500*C(i/42),s,s)

Feb 21 2016 8:49 PM UTC

}// 120/140

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#sphere

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sigveseb

function u(t) {

x.fillStyle='red';x.fillRect(0,0,2e3,2e3);x.font='999px A';x.fillStyle='#ff0';x.fillText(String.fromCharCode(9773),580,920)

Jan 8 2016 1:46 AM UTC

}// 123/140

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lionleaf

function u(t) {

c.width=2e3;x.translate(770,400);for(i=0;i++<40;)x.fillStyle=R(i*9),x.transform(-1,C(t+1)/9,S(t)/9,-1,400,0),x.fillRect(i,i,99,99)

Jan 8 2016 12:46 AM UTC

}// 130/140

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lionleaf

function u(t) {

c.width=2e3;x.translate(970,400);for(i=0;i++<30;)x.fillStyle=R(i*9),x.transform(-1,C(t+1)/2,S(t)/2,-1,0,0),x.fillRect(i,i,99,99)

Jan 8 2016 12:45 AM UTC

}// 128/140

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u/lionleaf_test

Twitter for short js canvas demos!! :D
u/joeytwiddle

YIkes, that thing looks sharp!

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lionleaf

function u(t) {

c.width=2e3;t*=4;x.translate(980,540);for(i=0;i<32;)x.rotate(!i*C(t-=.03)+!(i++%4)*S(t)/9+1.57),x.fillRect(9*i,9*i,99,99)

Jan 8 2016 12:44 AM UTC

}// 121/140

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u/ben

cute!
u/lionleaf

#floppy
u/erin

meaning of life

You've reached the end.

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