Dweets awesomed by u/@no_identd

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: #ScaryMovies

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perbyhring

function u(t) {

c.width^=0;for(i=0;i<1e3;i++){x.moveTo(v=960+C(i%100+t*S(t/3.14%i))*i,b=540-T(i%(2+t*1e-4)+S(t))*i);x.arc(v,b,20,-1,1);}x.fill();

Jan 25 2018 11:43 AM UTC

}// 129/140

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perbyhring

function u(t) {

c.width^=0;x.translate(960,540);x.rotate(S(t));for(i=0;i<1e3;i++)
x.fillRect(S(i%3.15+t)*i,T(i+t%6.18)*i,10*S(i%3.14),10*S(i%3.14))

Jan 25 2018 8:27 AM UTC

}// 131/140

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@no_identd

remix of d/6447 by u/DirtyDan

function u(t) {

c.width=1920
for(i=b=540;i>0;i-=.5)x.beginPath(),x.ellipse(a=960+i*S(t+i*2.5),((i**2.214297)/i+i+200)/2,i/b*200,i/b*50,0,0,44/9),x.stroke()

Jan 25 2018 1:56 AM UTC

}// 139/140

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This one has an illusion built in. You can mentally switch the rotation of what you see, which you may perceive as a 3D shape.

u/@no_identd

Also, if you add x.globalCompositeOperation='xor', like u/DirtyDan did here: https://www.dwitter.net/d/6430, you can STILL mentally flip it.
u/@no_identd

Actually, I've noticed, u/DirtyDan's original of this also has this illusion built in!

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@no_identd

function u(t) {

c.width|=0
for(i=0;i<36;){x.fillRect(860+S((i/(i/1.3324789))/(2.3999631)*t-i)*860,30*i++,200,25);}

Jan 25 2018 1:44 AM UTC

}// 98/140

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if you look at it with the right mindset, you can see a rotating 3D shape in this.

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perbyhring

function u(t) {

c.width=1920;h=540;x.fillRect(0,0,1e4,1e4);v=t*1e-5;for(i=0;i<1e4;i++)x.clearRect(i*T(v*i),(C(i%3.14)*h)/C(t*C(i)),T(i%6.18),10);

Jan 24 2018 9:05 PM UTC

}// 129/140

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u/donbright

cool

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Knifa

function u(t) {

_=45
c.width^=0
for(i=0;i<_;i++)for(j=0;j<_;j++){$=t+S(i/8)-C(j/4)
w=S($)**.85
x.fillStyle=R(0,T($)*255,w*255)
x.fillRect(_*i,_*j,_*w,_*w)}

Jan 23 2018 9:08 AM UTC

}// 139/140

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u/aleamb

cool
u/donbright

color + width is a nice effect

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mr_daemon

function u(t) {

c.width=1080;for(i=0;i<10;i++){for(j=0;j<40*(2+S(i+8*t)*C(i+t))*i;j+=10){x.fillStyle=R(j,850-j,0,1),x.fillRect(1000-i*99,500-j/2,75,35)}}

Jan 23 2018 12:05 AM UTC

}// 137/140

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gurke

remix of d/5777 by u/sigveseb

function u(t) {

t&&a<1920||(a=b=q=0,p=t*77%23+4,h+=20)
x.font='9em"'
x.fillText('🅱',a+=p,b)
b+=q++
b>930&q>0?q*=t%1/9-.9:0};{h=0

Jan 22 2018 11:55 PM UTC

}// 112/140

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@no_identd

remix of d/6364 by u/@no_identd

function u(t) {

_=48
for(i=0;i<_;i++)for(j=0;j<_;j++){r=t+(i-_)*(j-_/2)/_
$=S(r)
x.fillStyle=R($*255,t+S(r^5)*255*$,j**$^7)
x.fillRect(i*_,j*_-$*_,_*2,_*2)}

Jan 22 2018 10:59 PM UTC

}// 140/140

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u/joeytwiddle

Waves look good for surfing ... in a lava-proof wetsuit

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@no_identd

remix of d/6363 by u/Knifa

function u(t) {

_=48
for(i=0;i<_;i++)for(j=0;j<_;j++){r=t+(i-_)*(j-_/2)/_
$=T(r%i)
x.fillStyle=R($*255,S(r^5)*255*$,j**$^7)
x.fillRect(i*_,j*_-$*_,_*2,_*2)}

Jan 22 2018 10:58 PM UTC

}// 140/140

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