Dweets awesomed by u/joeytwiddle

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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iverjo

function u(t) {

for(i=0;i<2400;i++)x.beginPath(),x.arc(960+i*C(i/20),540+i*S(i/20)/3,29+i*i/2e4,0,7),x.fillStyle='#'+['000','A0E','FFF','9F0'][i%4],x.fill()

Jan 28 2017 10:00 PM UTC

}// 140/140

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Optical illusion: Go fullscreen and glance at the different parts of the image. As you move your eyes, it may seem like other parts of the image moves slightly.

Show more comments…
u/iverjo

This needs a large and bright display to work
u/donbright

lol i kept looking for 't' in your code, not there!
u/iverjo

Haha!
u/CliffJonesJr

I love these illusion dweets. Nice!
u/iverjo

Thanks :)
u/iverjo

#opticalillusion

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iverjo

function u(t) {

c.width=960;for(i=26;i--;)d=(i+3*t)%26,I=C(d*.7)>0?1:0,x.beginPath(),x.arc(480,270,I?(d*22):(600-d*22),0,6.4),x.lineWidth=12,x.stroke()

Jan 28 2017 9:13 PM UTC

}// 135/140

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Optical illusion: Go fullscreen and stare at the center for 15-30 seconds. Then look down at your keyboard. Notice anything unusual?

u/iverjo

129 characters: c.width=960;for(i=26;i--;)d=(i+3*t)%26,I=C(d*.7)>0?1:0,x.beginPath(),x.arc(480,270,I?d*22:600-d*22,0,7),x.lineWidth=12,x.stroke()
u/iverjo

#opticalillusion
u/ximavus

my eyes aren't eyeing lol

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iverjo

function u(t) {

c.width=1920;x.beginPath();x.beginPath();x.arc(960,500,199,t*4+2*C(t),t*4+3.2+2*S(t));x.lineWidth=40;x.strokeStyle='#5592FB';x.stroke();

Jan 14 2017 4:48 PM UTC

}// 136/140

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Android-style loading spinner

u/iverjo

119 characters: c.width^=0;x.beginPath();x.arc(960,500,199,t*4+2*C(t),t*4+3.2+2*S(t));x.lineWidth=40;x.strokeStyle='#5592FB';x.stroke()
u/iverjo

#loading #spinner

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iverjo

remix of d/598 by u/iverjo

function u(t) {

c.width=1920;for(i=-2;i<2;i+=.05)for(j=-4;j<4;j+=.05)X=j-3*S(t),Y=i+C(t),1/(j*j+Y*Y)+1/(X*X+i*i)>1&&x.fillRect(j*240+960,i*240+540,12,12)

Jan 14 2017 3:56 PM UTC

}// 137/140

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u/nickd3000

A weird remix https://www.dwitter.net/d/6361
u/iverjo

#metaballs

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iverjo

remix of d/143 by u/chunnoo

function u(t) {

c.width=1920;for(i=-2;i<2;i+=.05)for(j=-4;j<4;j+=.05)a=i*j-3*T(t),1/(j*j+i*i)+1/(a*a+i*i)>1&&x.fillRect(j*240+960,i*240+540,12,12)

Jan 14 2017 3:44 PM UTC

}// 130/140

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Let the dweetoff begin!

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lionleaf

remix of d/592 by u/New_Core

function u(t) {

c.width=2e3;a=99*S(t)+300;;for(b=i=500;i--;)x.strokeStyle='red',X=1e3+a*S(i)*S(i*0.5+.3*T(t))-b*C(t*.5),Y=b+a*C(i),x.lineTo(X,Y);x.stroke();

Jan 13 2017 8:33 PM UTC

}// 140/140

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Hot air baloon caught in a tornado!

u/lionleaf

#balloon

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New_Core

remix of d/590 by u/New_Core

function u(t) {

c.width=2e3;a=200*S(t)+300;for(b=i=500;i--;)X=1e3+a*S(i)*S(i*0.5-t)-b*C(t*.5),Y=b+a*C(i),x.lineTo(X,Y);x.stroke();

Jan 13 2017 11:57 AM UTC

}// 114/140

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u/sigveseb

now add shadows :D

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BriSeven

function u(t) {

N=50;P=44/7;c.width=1920;for(j=0;j<N;j++)for(i=0;i<N;i++)
x.fillRect(980+S(j/N*P*2)*150+S(i/N*P)*300,
540+C(j/N*P*2)*150+C(t+i/N*P)*300,5,5)

Jan 6 2017 7:37 AM UTC

}// 140/140

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u/iverjo

Cool, a torus!
u/donbright

NICE
u/Purpzie

Shortened by 5 characters: for(c.width|=a=0,N=50,P=44/7;a<N*N;)x.fillRect(980+S((j=0|a++/50)/N*P*2)*150+S((i=a%50)/N*P)*300,540+C(j/N*P*2)*150+C(t+i/N*P)*300,5,5)
u/Cloud

#tor

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BriSeven

remix of d/585 by u/BriSeven

function u(t) {

m=140;x.fillStyle=R(C(h=t/2)*m+m,S(h-.5)*m+m,S(-h-.5)*m+m,.004);x.fillRect(99+t%13*m,0,4,2e3);x.drawImage(c,6*C(t*3),0,1920,1078)

Jan 5 2017 1:36 AM UTC

}// 129/140

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spoke too soon. you can push this even further

u/BriSeven

turn the opacity of the fill up to .5 to see some mad
u/iverjo

trippy ^^

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BriSeven

remix of d/570 by u/BriSeven

function u(t) {

t=t%5;if(t<.1)r=X=Y=0,W=c.width=960,H=540;for(i=W*4;i--;)for(j=-1;j<2;j+=2)x.fillRect((X=(X+S(r+=C(t*i*r)/2))%W)*j+W/2,Y=(Y+C(r))%H,1,90/i)

Jan 1 2017 12:39 AM UTC

}// 139/140

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Rorschach with drips courtesy of 90/i

u/donbright

dude i love this...

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