New #OpticalIllusion dweets

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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pythech

remix of d/8455 by u/pythech

function u(t) {

with(x)for(i=200;i--;fillRect(i*9,!fillText("👤",i%9*200,i*30),9,2e3))fillStyle=`hsl(209,33%,${Math.abs((i+t*50)%62-31)*2+9}%)`,font="9em x"

Jun 6 2018 8:50 PM UTC

}// 139/140

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works with apple emojis only

u/pythech

optical illusion, stare at it for a few seconds
u/DataMeta

cool!
u/iverjo

#opticalillusion

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pythech

remix of d/8454 by u/pythech

function u(t) {

with(x)for(i=200;i--;fillRect(i*9,!fillText("💧",i%9*200,i*30),9,2e3))fillStyle=`hsl(193,80%,${Math.abs((i+t*60)%62-31)*2.8}%)`,font="9em x"

Jun 6 2018 8:15 PM UTC

}// 139/140

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does it move?

u/pythech

optical illusion, stare at it for 10 seconds
u/iverjo

#opticalillusion

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pythech

function u(t) {

with(x)for(i=200;i--;fillRect(i*9,!fillText("😁",i%9*200,i*30),9,2e3))fillStyle=`hsl(39,80%,${Math.abs((i+t*60)%62-31)*2.8}%)`,font="5em x"

Jun 6 2018 8:09 PM UTC

}// 138/140

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based on "swimming fish optical illusion"

u/pythech

works with Apple emojis, probably doesn't work with other devices
u/S.T.L.K.R.

STARE AT IT FOR 10 SECONDS
u/iverjo

#opticalillusion

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anthonylewis

remix of d/7608 by u/anthonylewis

function u(t) {

for(c.width|=i=19;i--;)for(j=10;j--;)
Math.random()>.99?
x.fillRect(i*100,j*100,75,75):
x.strokeRect(i*100,j*100,75,75)

May 4 2018 4:54 AM UTC

}// 119/140

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Blinking Lights

u/iverjo

Look in full screen, and you might start seeing circles near the square corners! #opticalillusion

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magna

remix of d/3676 by u/magna

function u(t) {

w=c.width=384;for(i=w*w;i--;x.fillRect(X,Y,1,1))X=i%w,Y=i/w|0,x.fillStyle=R(X,(X+1&30|Y+4&24&&Y+1&30|X+4&24?(X^Y)&32?4:5:X+Y+6&32?3:7)/9*w)

Dec 21 2017 2:49 AM UTC

}// 139/140

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u/iverjo

#opticalillusion

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magna

remix of d/3675 by u/magna

function u(t) {

w=c.width=384;for(i=w*w;i--;x.fillRect(X,Y,1,1))X=i%w,Y=i/w|0,x.fillStyle=R(c=(X+1&30|Y+4&24&&Y+1&30|X+4&24?(X^Y)&32?4:5:X+Y+6&32?3:7)/9*w)

Dec 20 2017 10:48 PM UTC

}// 139/140

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u/iverjo

#opticalillusion

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magna

remix of d/3674 by u/magna

function u(t) {

w=c.width=384;for(i=w*w;i--;x.fillRect(X,Y,1,1))X=i%w,Y=i/w|0,x.fillStyle=R(c=(X+1&30|Y+4&24&&Y+1&30|X+4&24?(X^Y)&32?4:5:X+6&32?3:7)/9*w)

Dec 20 2017 10:47 PM UTC

}// 137/140

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u/iverjo

Love this optical illusion
u/sandromiccoli

delicious
u/magna

#opticalillusion

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magna

function u(t) {

w=c.width=384;for(i=w*216;i--;x.fillRect(X,Y,1,1))X=i%w,Y=i/w|0,x.fillStyle=R(c=X+1&30|Y+4&24&&Y+1&30|X+4&24?(X^Y)&32?183:205:255,c,c)

Dec 20 2017 10:31 PM UTC

}// 134/140

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#opticalillusion

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bga_

function u(t) {

for(n=16,W=c.width|=p=0;++p<64*n;)r=Math.exp(U=(p&64?63-p%64:p%64)/9),x.lineTo(W/2+S(a=U+t+6.28*(p>>6)/n)*r,c.height/2+C(a)*r);x.fill()

Mar 9 2017 5:25 PM UTC

}// 135/140

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Hypnos! n = count of segments / 2

u/iverjo

Very nice!
u/iverjo

#spiral #opticalillusion
u/384.cz

AWESOME
u/384.cz

AMAZING

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iverjo

function u(t) {

c.width=384;for(i=20;i--;)for(j=9;j--;)if(!i||(i^j)%2){x.fillStyle=R(a=i?0:240),x.fillRect(i*20+j%2*4*S(t)-25+9*S(j),j*20,i?20:420,i?20:2)}

Mar 2 2017 6:29 PM UTC

}// 139/140

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Optical illusion thingy. It's supposed to look like the red lines are not really straight and parallel. #bartjs

u/sfz

it works, trippy!
u/iverjo

Fun fact: This was actually the first idea I ever had for a dweet, back in december 2015 when sigve made https://github.com/sigvef/arktis-tweet-demo/
u/donbright

great illusion
u/SpecialAgent

Expecting a gorilla and some barrels to come hurtling down. Love it.
u/iverjo

#opticalillusion

dwitter.net | #OpticalIllusion