New #illusion 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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katkip

remix of d/11139 by u/anotherkitten

function u(t) {

x.fillStyle=`hsl(${t*99} 50%${50+50*S(t*99)}%`;x.arc(960,540,t+S(t**5)*t,3+C(t*99)*3,3+S(t*66)*3);x.fill();x.drawImage(c,-72,-40,2064,1160)

Nov 25 2018 10:33 AM UTC

}// 139/140

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Falling in the #illusion #waitforit stare in the middle for few seconds in fullscreen and see what happens

u/joeytwiddle

Yeah that's ... uh ... powerful!

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katkip

remix of d/11022 by u/katkip

function u(t) {

x.arc(960,540,150*t,0,7);x.stroke()

Nov 17 2018 5:19 PM UTC

}// 35/140

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Longer than short art #illusion if you watch the center

u/jylikangas

You can save one byte like this: x.arc(960,540,150*t,!x.stroke(),7)
u/katkip

true

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katkip

function u(t) {

if(t<3){for(i=10;i--;)x.fillStyle=`hsl(${t*10*i},99%,50%)`,x.fillRect(0,0,30*i,i*30),x.translate(i*.1,i*.061)}

Nov 15 2018 1:26 PM UTC

}// 110/140

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3D "GLASS" tunnel #d3 #tunnel #illusion

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yonatan

function u(t) {

a='fillRect'
b='clearRect'
n=C(t/2)>0
x[n?b:a](0,0,2e3,2e3)
for(i=9;i--;x[n?a:b](960+(i-4-n/2)*d,540-d,d/2,d*2))d=330-C(t)*220

Oct 11 2018 9:19 AM UTC

}// 126/140

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#default

Show more comments…
u/katkip

this
u/katkip

is one
u/katkip

of the best defaults
u/katkip

I have ever seen
u/katkip

#illusion
u/magna

Dave would be proud.
u/joeytwiddle

#infinite #loop

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atgz

remix of d/9723 by u/DataMeta

function u(t) {

c.width|=i=768;x.transform(1,0,0,1,960,540)
for(i;i--;x.rotate(t/64))x.fillRect(i--,i--,i--/8,i)

Sep 22 2018 6:07 AM UTC

}// 96/140

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focus on the middle for a minute then look elsewhere on the screen #illusion

u/joeytwiddle

Fast and funky version: t*=9;c.width|=i=768

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katkip

function u(t) {

c.width*=1;
for(i=0;i<400;i++)x.fillRect(i*(5+t/99),0,S(t*i/99)*3,2000)
for(i=0;i<400;i++)x.fillRect(0,i*(5+t/100),2000,S(t*i/99)*3)

Sep 21 2018 11:28 AM UTC

}// 132/140

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Black and white illusion. Don't see the #illusion ? Fullscreen

u/metamero

#ScintillatingGridIllusion

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f8f82804

remix of d/9671 by u/f8f82804

function u(t) {

with(x)for(i=c.width^=0,arc(960,530,475,0,7),clip();beginPath(),i--;fill())C(t-i)>0&&arc(960+(i*960-i*i)**.5*S(t-i),48+i,9,0,7)

Sep 5 2018 7:03 PM UTC

}// 127/140

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proof-of-concept for #clip #mask to help clean up the edges of a #sphere

u/joeytwiddle

This is doing something weird to my eyes! #illusion

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katkip

remix of d/9553 by u/katkip

function u(t) {

c.width=100;p=0;for(i=0;i<100;i++)for(j=0;j<100;j++)x.fillStyle=`hsl(${C(i/0.3+t)<S(j/0.3+t)?100:200},99%,50%)`,x.fillRect(i,j,1,1),p++

Aug 31 2018 10:04 AM UTC

}// 135/140

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#illusion you don't know if it is changing or not

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katkip

function u(t) {

x.arc(960,540,40*+Math.abs(T(t)*t),t*t,t);x.fill()
x.globalCompositeOperation='xor';FPS=200

Aug 25 2018 11:33 AM UTC

}// 91/140

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Visual #illusion . Fullscreen and look in the center then look in the middle for 1 minute then look away. See that lines? lol

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f8f82804

function u(t) {

c.width^=0;with(x){lineWidth=6;translate(960,540);rotate(42*t);fill(arc(0,0,440,0,3));for(i=30;i--;stroke())beginPath(),arc(0,0,15*i,i,i+2)}

Aug 23 2018 11:01 PM UTC

}// 140/140

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Benham's top #illusion -- https://en.wikipedia.org/wiki/Benham%27s_top

u/f8f82804

#opticalillusion

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