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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: #Food

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veubeke

function u(t) {

x.font='20em"A'
for(i=22;i--;)for(y=10;y--;x.fillText('✋',i*100+(i%2?_:-_)-200,100+_+y*300))_=S(t*4)*100

Oct 8 2024 7:41 AM UTC

}// 104/140

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All hands on deck

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zadgy5534

function u(t) {

for(w=i=1e3;i--;)
x.fillStyle=R(i,i,w/i),
x.fillRect(960+i*C(t)*9,540+i*S(i/w)*9,4,4) // draw 50x200 rects

Oct 6 2024 9:09 AM UTC

}// 106/140

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dotted horizon

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New_Core

function u(t) {

for(i=500;i--;x.fillRect(960+q*S(i)-i/2,540+q*C(i)-i/2,i,i))q=i+i*S(t+i/7),x.fillStyle=R(i/2)

Sep 28 2024 8:44 AM UTC

}// 93/140

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HardlyProductive

function u(t) {

for(x.reset(r=999);r--;)for(a=25;a--;){
p=960;f=(m)=>{l=m*(r**2/p);x.fillRect(p+r*S(a+m*t)+l*C(a),p/2+r*C(a+m*t)-l*S(a),3,3)}
f(1)
f(-1)}

Sep 27 2024 7:17 AM UTC

}// 137/140

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trying for a mandala

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mistrfu

function u(t) {

c.width|=f=(f,y,x)=>f+f*y(x)
for(i=~~((5-3*C(t/3))*8e2);i--;)x.lineTo(f(960,C,i+t/125),f(540,S,T(C(t/9e3))*i))
x.stroke()

Sep 26 2024 7:00 PM UTC

}// 122/140

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b4d.r00m

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cantelope

function u(t) {

eval(unescape(escape`𩡯𬠨𭰽𪐽𨰮𭱩𩁴𪁼👨🐵𝀰𞱩𛐭𞱸𛡦𪑬𫁒𩑣𭀨𪐥𜠪𞐰𜀫𪀫𤰨𬐩𚡬𛰨𦠽𠰨𬀩𚡤𚰲𚐪𪀭𚁳👬𚠹𞐯𦠩𛰲𛁨𚱙𛱚𚡨𛑳𛰲𛁳𛁳𚐩𦐽𤰨𬀽𚁍👍𨑴𪀩𛡡𭁡𫠲𚁙👃𚁱🐲𝐯𭰪𪐫𭀪𞐩𚠨𫀽𪐯𭰩𛁚🐮𝐭𫀩𚱴𚐪𚁤👍𛡨𮑰𫱴𚁙𛁚𚐩𛁸𛡦𪑬𫁓𭁹𫁥🐧𘰸𜁦𜠧`.replace(/u../g,'')))

Sep 25 2024 9:43 PM UTC

}// 140/140

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dual spirals

u/magna

Could we parallax this?
u/cantelope

um. yes. you mean add a parallax background?
u/magna

I mean stereoscopy: Making these left eye + right eye views instead of clones.
u/cantelope

ah. i have still to learn that magic :D
u/danny@hille.dk

As with many things in life, the theory is quite simple: you simply take two virtual cameras and place them approximately 62 mm apart, pointing them towards the same point (your object), and that should create a rather convincing 3D effect.

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rodrigo.siqueira

remix of d/32507 by u/rodrigo.siqueira

function u(t) {

for(i=(d=w=c.width|=0)*9;i--;d+=t)x.fillStyle=R(r=T(i)*i,r>0?g=T(i*i)*i:0,r<0&&g<0?T(i*i*i)*i:0),x.fillRect(d**2.5%w,i/9,z=T(i/t),T(i))

Sep 24 2024 11:13 PM UTC

}// 135/140

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Fast Mondrian patterns

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baegus

function u(t) {

c.width*=1
for(i=90;i--;){
x.fillStyle=R(2*i,i*1,90)
x.beginPath()
x.arc(i*23,44*i*S(t*60-i<<10)+560,i*9,0,8)
x.fill()}

Sep 23 2024 9:26 PM UTC

}// 119/140

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Simple color dispenser

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rodrigo.siqueira

remix of d/31920 by u/rodrigo.siqueira

function u(t) {

for(a=b=t,i=2e4;i--;b+=C(a*3)/4-b/6,a+=r/4+b*S(a*2)/3-a/6)i&2?r=i/b&1:c.style='filter:invert()sepia(',x.fillRect(b*2e3+400,a*3e3-800,.1,t<6)

Sep 23 2024 6:41 PM UTC

}// 140/140

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Charcoal Ammonite #spiral #ammonite

u/SockTaters

brilliant #fossil

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SockTaters

remix of d/32485 by u/SockTaters

function u(t) {

t?c.width=w=innerWidth:P=13
onclick=m=>P-=P&&(m.x-a-3)**2+(m.y-b+3)**2<w
x.fillText("VᨆᨈΛ"[3&t*P],a=w/2+w/3*S(t*P/8),b=w/4+w/5*S(t*P/10))

Sep 23 2024 8:01 AM UTC

}// 137/140

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Click to Pet 🤎