Dweets awesomed by u/13thptr

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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smtsjhr

function u(t) {

for(c.width|=n=4;n--;x.stroke())for(i=80;k=(150+80*C(t*i/50))-t%1**i,i--;)x.lineTo(450*n+250+k*S(j=i*6.28/(n+3)),540-k*C(j+t*(n+3)/5))

Nov 14 2020 9:50 PM UTC

}// 134/140

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webbed polygons spin themselves

u/katkip

looking nice
u/rodrigo.siqueira

I once made one similar, a "Polygon showcase" from 1 to 8 vertices: https://www.dwitter.net/d/10692
u/smtsjhr

@ u/rodrigo.siqueira very nice and concise! i think maybe there's room there for one more loop to iterate through the "web" like

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meeuw

function u(t) {

d=Math.random;for(i=0;i<2000;i++){h=d()*1920;v=d()*1080;k=(h&v)*20;x.fillStyle=R(k,k,k,1);x.fillRect(h,v,3,3)}

Nov 14 2020 8:15 PM UTC

}// 110/140

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Sierpiński

u/tomxor

It's fluffy! :D

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rep_movsd

function u(t) {

eval(unescape(escape`𭁼𯀨𦀽𦐽𤐽𜰵𝐩𛁢👤🐾𩀪𭀥𤐊𭱩𭁨𚁸𚑦𫱲𚁺👫🐾𩡩𫁬𤱴𮑬𩐽𪰬𮀮𩠽𩡩𫁬𤡥𨱴𛁺𨀣𜀰𜀱𨀬𩠨𜀬𜀬𡠽𜡥𜰬𜡥𜰩𛁋👢𚁑𚐬𢰼𜠹𙠦𚁘👘𚠷𙑆𛁙👙𚠳𙐱𩐳𚐬𮠨𤠨𢰬𦀥𤐬𦐥𤐩𚐬𦠽𞐻𦠭𛐻𚑦𫱲𚁡🐱𞱡🀷𞰩𩠨𦀫𢰪𠰨𨐫🐮𜰩𛁙𚱋𚡓𚁡𚐬𞀬𞀩`.replace(/u../g,'')))

Nov 14 2020 6:48 PM UTC

}// 139/140

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#deepavali #fireworks #festival

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New_Core

function u(t) {

t?t%2<1.98?0:Z=Z*1.4:Z=.1
for(i=22;i--;x.fillRect(300+b*50,0,C(a+b),182))b=t*60%2,x.setTransform(d=Z*S(a=t/7+i/3.5),e=Z*C(a),e,-d,999,540)

Nov 14 2020 3:55 PM UTC

}// 138/140

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tomxor

remix of d/20584 by u/tomxor

function u(t) {

eval(unescape(escape`𩡯𬠨𨰮𭱩𩁴𪀽𜐹𜠬𤠽𝀸𛁩🐸𜀶𝀻𪐭𛐻𮀮𩡩𫁬𤡥𨱴𚁓𚰹𝠬𥀫𝐴𛁃𚁡👍𨑴𪀮𨑴𨑮𜠨𤰽𪐥𞐷𛑒𛁔👩𛰹𝰭𤠬𬠽𚁓𚡓𚱔𚡔𚐪𚠮𝐩𚠹𚐪𜠰𛑲𙠴𝀦𙡲🠳𝠿𬠼𝀲🱔𛱒𞡓𛱒𞠱𛁲🠳𝠿𬠼𤠺𮠨𜰩𛰵𚐩𮠽𫠽🡮𛐭𙠦𠰨𨐯𜰫𬠫𭀪𞐩𚡃𚁔𛰵𚱺𚁮𚐪𜠩𛑲𛰶`.replace(/u../g,'')))

Nov 14 2020 1:20 PM UTC

}// 139/140

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#stargate connected to a world with a #blackhole

u/tomxor

From "A Matter of Time" episode, requested from u/nbevans on HN.

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femto113

function u(t) {

c.width=1920
X=960,Y=540,P=Math.PI,N=t/P%32,p=P/N
for(i=0;i<P;i+=p)x.fillRect(X+Y*(S(i+P)-S(i))/2*S(t+i),Y+Y*(C(i+P)-C(i))/2*S(t+i),19,19)

Nov 14 2020 8:31 AM UTC

}// 138/140

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linear motion rolling circle illusion

u/katkip

#illusion
u/DataMeta

nicely done
u/pavel

If you delete c.width=1920 you can see only the first dot move linearly
u/femto113

curves are a side effect of changing N with t, if you use a fixed value like N=16 you get straight lines

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dnmc

function u(t) {

c.width=1000
for(i=1;i<100;i++)
for(j=1;j<100;j++) {
x.fillStyle=R(255*i/j/(1+C(t)),0,j*j/i/(1+S(t))/50*255);
x.fillRect(i*10,j*10,10,10)
}

Nov 14 2020 5:26 AM UTC

}// 139/140

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Waves

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dnmc

function u(t) {

c.width=1920
for(q=0;q<192;q++)for(w=0;w<108;w++)if(q*w%Math.round(S(t/5)*50)!=0){x.fillStyle=R(C(t)*200);x.fillRect(q*10,w*10,10,10)}

Nov 14 2020 5:11 AM UTC

}// 134/140

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Mystery boxes

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pavel

function u(t) {

with(x)for(c.width|=i=78,translate(960,540);j=i*i--/5;rotate(!fillRect(j+=(S(t-j/99)-1)*1e5/j,j*=j>0,j*=-2,j)))fillStyle=R(89,a=222-j/4,2*a)

Nov 14 2020 4:47 AM UTC

}// 140/140

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Generative art by Alexander Tabakov

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rodrigo.siqueira

remix of d/20589 by u/rodrigo.siqueira

function u(t) {

for(i=5e3,c.width|=f=g=>500*(T(i+t/9))*g(i*i+t/2);i--;x.lineWidth=2)x.strokeRect(960+f(C),540+f(S),s=.9*T(i/91),s)

Nov 14 2020 1:40 AM UTC

}// 114/140

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Rotating squares galaxy #squares

dwitter.net | 13thptr (20385)