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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.

Try the new frontend: beta.dwitter.net
Current theme challenge: #Food

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LimeLaser

function u(t) {

f=(60*t|0)%1e3
x.fillStyle=`HSL(${f},99%,50%)`
x.fillRect(1.7*f,f,99,99)
x.translate(960,540)
x.rotate(0.1)
x.translate(-960,-540)

Sep 11 2021 6:23 AM UTC

}// 130/140

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Color Spiral

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rep_movsd

function u(t) {

eval(unescape(escape`𨰮𭱩𩁴𪁼🐰𛁆🐨𠐬𠠬𦀬𦐩🐾𮱸𛡦𫱮𭀽𨀤𮱂𯑥𫐧𨀻𮀮𩡩𫁬𥁥𮁴𚁓𭁲𪑮𩰮𩡲𫱭𠱯𩁥𤁯𪑮𭀨𠐩𛁘𛀱𜀸𜀭𦐩𯐊𩡯𬠨𦐽𜐰𜀻𦐼𜐲𜀰𞱙𚰽𜰲𜀩𩡯𬠨𦀽𦐭𞐹𞱘🀱𞀲𜀭𦐻𦀫🐲𜰰𚐊𡠨𜐲𞐳𞀷𛀲𜀬𦀬𦐩𛁆𚀱𜠷𞀱𜠫𚁴𚰫𯀰𚐥𜐶𛁅🐴𛁘𚰱𜠸𛁙𚰷𜠩`.replace(/u../g,'')))

Sep 8 2021 2:04 PM UTC

}// 139/140

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Canned fruit stand

u/rep_movsd

Best viewed on Firefox

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taupelink

remix of d/23760 by u/taupelink

function u(t) {

for(i=q=k=810;--i;x.fillRect(k*X,k-q*Y,-i/v,q*Y/v))f=i*t,X=f*f%5,Y=X*f%4-2,x.fillStyle=R(s=q+i*Y*.4,q^=-s,q^=255,(k+q)*(Y+3)**2/4e4),v=4**t

Sep 6 2021 6:21 AM UTC

}// 139/140

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d/23766

u/rep_movsd

You need to write a blog about this particular technique
u/taupelink

i'd like to, but it would take time (i'm a super slow writer) and it's honestly not a priority at the moment. I can at least say this: Part of how I get four vertical bands is having Y range from less than -1 to greater than 1 (in this case, -2 to 2). Multiplying or dividing by Y then has four effects: stretch or compress, do or do not reverse sign
u/rep_movsd

A one page breakdown would be nice, or perhaps I'll write one
u/taupelink

ah ok...like a line-by-line explanation? that's doable...i'll write something up next weekend!

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rodrigo.siqueira

remix of d/23735 by u/rodrigo.siqueira

function u(t) {

for(i=k=680;--i;x.fillRect(k-i*Y,k+v*i,30*q*X*v,Y*i*v))f=i*t,X=f*f%3-1,Y=X*f%4-2,x.fillStyle=R(q=i*T(X)*X,q*=X*X,q*=f*S(Y)/29,i/q/q),v=.1**t

Sep 5 2021 12:59 PM UTC

}// 140/140

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Purple sunset landscape

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tactical_retard

function u(t) {

c.width|=0
x.font="6em'"
x.fillText("🐟",900,500)
for(i=8;i--;)x.drawImage(c,C(t)*50,S(i)*100)
x.drawImage(c,470+C(t)*420,300,960,540)

Sep 4 2021 1:21 AM UTC

}// 133/140

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#fish

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danny@hille.dk

remix of d/23661 by u/rodrigo.siqueira

function u(t) {

s=70,A=Z=a=b=t*.001;for(i=3e4;--i;t<4&&(x.fillRect(780+a*s,340+b*s,1,1),a=1.6-b+Math.abs(S(a)+a*1.022)))b=A,A=a

Aug 30 2021 6:09 PM UTC

}// 111/140

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tooth fary remix

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e4494s

function u(t) {

with(x){c.width=1920;w=960;z=540;for(i=0;i<9;i++){w+=98*C(t*i);z+=98*S(t*i);fillStyle=R(99,0,99,.3);beginPath();arc(w,z,49,0,7);fill()}}

Aug 29 2021 7:58 PM UTC

}// 136/140

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Purple spinning circles

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TGY

remix of d/23637 by u/TGY

function u(t) {

with(x)for(translate(t?0:m=993,t?0:540),i=99;i--;fillRect(-2*m,z,4e3,9+z/9))fillStyle=R(z=2*m/((i*i-t*9)%m),z*3,z*5,1),rotate(-T+(T=i+t/3))

Aug 24 2021 10:41 AM UTC

}// 139/140

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cleaner spider net

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TGY

function u(t) {

eval(unescape(escape`󨼮󭽩󩍴󪌽󝜶󞌊󭍼󯌨󨜽󥌽󜌬󦌽󦜽󞜹󛍯󫭫󩝹󩍯󭽮󟝥󟜾󚍥󟝥󛭷󪍩󨽨󛜳󞌩󟽡󚼽󩜯󞜺󥍼󟜱󝬩󒭷󪝴󪌨󮌩󨭥󩽩󫭐󨝴󪌨󭍲󨝮󬽬󨝴󩜨󦌭󟝃󚍡󚜪󥌬󦜭󟝓󚍡󚜪󥌩󚜬󬭯󭍡󭍥󚍡󚜬󬭥󨽴󚍴󙜱󚬹󚼹󛌭󝌬󞜹󛍔󟽔󛜭󙬰󞬸󚜬󩭩󫍬󚍡󬭣󚌰󛌰󛌹󛌰󛌷󚜩`.replace(/u../g,'')))

Aug 23 2021 2:32 PM UTC

}// 133/140

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#interactive #game pool Use Up button to shoot, Right/Left to change angle

u/TGY

Original idea involved mouse controls, but I was unlucky golfing it. Here is source for you to try golf&play c.width=568 t||(a=T=0,X=Y=99,onmousemove=e=>a=T?a:Math.atan2(e.y-Y,e.x-X),onclick=e=>T||=16) with(x)beginPath(translate(X-=C(a)*T,Y-=S(a)*T)),rotate(a),rect(t%1*9+9,-4,99,T?T--&0:8),fill(arc(0,0,9,0,7))

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Joachim

function u(t) {

eval(unescape(escape`󩭯󬬨󪜠󪝮󘍣󛭷󪝤󭍨󟜳󜌰󛍴󟽡󟬳󜜰󟽡󟜭󜜰󞭡󚼽󛬳󜬺󨜽󜌬󮌩󮍛󪝛󜍝󚽩󦼴󧝝󟝸󦽩󧜻󭽩󭍨󚍸󚝭󥌨󨜬󜜱󜌩󛍬󥌨󨜬󜜳󜌩󛍬󥌨󨜭󞜪󠼨󜼪󭌩󛌱󝼰󛜹󚭓󚌳󚭴󚜩󛍭󥌨󨜬󜜳󜌩󛍬󥌨󨜭󞜪󠼨󪼽󜼪󭌫󞜩󛌱󝼰󛜹󚭓󚍫󚜩󛍳󭍲󫽫󩜨󚜬󬽴󬭯󪽥󤭥󨽴󚍡󛜹󛌹󜌬󜬰󛌲󜌩`.replace(/u../g,'')))

Aug 22 2021 10:40 AM UTC

}// 140/140

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Armless walker

u/Joachim

Like my previous dweet, I couldnt golf the circles
u/rep_movsd

Nice - I will try a humble remix
u/Joachim

👍