Dweets awesomed by u/AaronGiles

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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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

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AaronGiles

function u(t) {

x.lineWidth=25;x.beginPath();x.moveTo(0,0);w=2e3;m=255;x.strokeStyle=R(m,t*w/3%m);x.quadraticCurveTo(w*2*S(t),w*C(t/7),w,w/2);x.stroke();

Mar 2 2017 4:14 PM UTC

}// 137/140

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u/donbright

looks like a pumpkin in a wormhole

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AaronGiles

function u(t) {

x.font='60px Arial';y=t*60%27*41;x.fillStyle='#000';x.fillRect(0,y,1920,41);x.fillStyle='#090';for(z=0;z<64;z++)x.fillText(z*y*t%9|0,z*30,y)

Mar 2 2017 8:41 AM UTC

}// 140/140

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AaronGiles

function u(t) {

t*=4;x.rotate(0);c.width|=0;for(i=255;i>=0;i-=.1)x.fillStyle=R(i,i^128,256-i,i/256),x.rotate(i),x.fillRect((200*t+i*7-200)%1999,0,60,10)

Mar 2 2017 8:29 AM UTC

}// 136/140

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AaronGiles

function u(t) {

c.width|=0;for(i=0;i<256;i+=.25)s=S(t+i),o=C(t-1.1*i),x.fillStyle=R(i,255-i,0,i/255),x.fillRect(800+i+s*800,400+i+o*400,10,10)

Mar 2 2017 8:02 AM UTC

}// 126/140

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AaronGiles

function u(t) {

c.width|=0;for(i=0;i<1;i+=.15)j=S(t+i),x.lineWidth=30+j*9,x.strokeStyle=`hsl(${j*255},99%,50%)`,x.arc(960,540,500*j*j,.5*t,.4*t),x.stroke();

Mar 2 2017 7:28 AM UTC

}// 140/140

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Doesn't work right on Edge.

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ClayCowgill

function u(t) {

for(j=0;j<900;j++)x.globalAlpha=.3,
i=S(t)*4,s=S(t+j),o=C(t-j),x.fillStyle=`hsl(${j-t},100%,50%)`,x.fillRect(950+j*s,500+j*i*o/3,10,10)

Mar 2 2017 7:14 AM UTC

}// 135/140

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u/Purpzie

Shortened by 18 characters: for(x.globalAlpha=.3,j=900;j--;)x.fillStyle=hsl(${j-t} 99%50%),x.fillRect(960+j*S(t+j),540+j*(S(t)*4)*C(t-j)/3,9,9)
u/Purpzie

Wait, 2 more characters can be shaved off so now it's 20 characters less than yours: for(x.globalAlpha=.3,j=900;j--;)x.fillStyle=hsl(${j-t} 99%50%),x.fillRect(960+j*S(t+j),540+j*S(t)*4*C(t-j)/3,9,9)

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AaronGiles

function u(t) {

c.width|=0;x.fillStyle='green';x.font='60px Arial';for(y=0;y<27;y++)for(z=0;z<64;z++)x.fillText(Math.random()*10|0,z*30,y*41);

Mar 2 2017 6:56 AM UTC

}// 127/140

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AaronGiles

function u(t) {

c.width|=0;w=960;h=540;for(z=0;z<6.28;z+=0.05)i=S(t)*S(t)*7,s=S(t-z),o=C(t+z),x.fillRect(w+(w-70*i)*s,h+(h*s-50*i)*o,15,15)

Mar 2 2017 5:56 AM UTC

}// 123/140

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Renaud___

function u(t) {

l=c.width+=i=0;h=400;for(;++i<200;)for(j=a=(t+C(i))%2;j++<50;)x.fillRect(l*C(i*i)+~~a*(w=a*h-h)*C(j),(~~a?h:a*h)*(C(i)*C(i)+2)+w*S(j)/4,3,3)

Feb 27 2017 12:09 PM UTC

}// 140/140

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Show more comments…
u/HeyJD

This looks amazing. Great job.
u/Renaud___

Thanks :)
u/khalkeus

this is super neat
u/iverjo

Wow!
u/lionleaf

Brilliant!
u/tbroadley

Sweet!
u/donbright

OMG OMG OMG OMG
u/ninerdelta

mind blown
u/sfz

(((does we're not worth bow)))
u/Kalanchoe

That's so beautiful!
u/spbyrne

Incredible
u/Renaud___

wow ... thanks again for all the nice reviews :)
u/punkhaa

mice
u/punkhaa

*nice
u/gormisdomai

I joined this site for this kind of thing
u/lionleaf

On mobile you can tap at different locations for different colors
u/lionleaf

Haha, oops, that comment was for another dweet. This still remains one of my favorites!!
u/sigveseb

golfed to 137: for(l=c.width+=i=0,h=400;++i<200;)for(j=a=(t+C(i))%2;j++<50;)x.fillRect(l*C(i*i)+~~a*(w=a*h-h)*C(j),(~~a?h:a*h)*(C(i)**2+2)+w*S(j)/4,3,3)
u/FireFly

Eternal rains will come… I really like this one, very pretty!
u/zhanglongdream

啊啊啊
u/leonarven

It was really nice to solve the secret of this code! Such simple, but such brilliant! Good job!
u/sb

My favorite
u/arowberry

I love it. Reminds me of my Seattle days.
u/21medals

What does ~~ do? Like in (~~a?h:a*h)
u/Renaud___

It work as a math.floor. actually there is a difference but i dont remember how exactly
u/Renaud___

Dunno what changed in Chrome recently, but now this animation is very very slow :(
u/hollo47

#rain
u/noonat

~ is a bitwise not. It flips all the bits in the number to the opposite. Flipping again (~~) puts the bits back to what they were. It works does something similar to floor because it truncates floats to 32-bit integers as part of the operation. (But unlike floor, ~~-2.1 is -2 instead of -3.)
u/rbong

I did a detailed analysis of this effect in a medium post: https://medium.com/@r.l.bongers/visual-effec…
u/vain

cool raindrop fx

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