Top dweets by u/xem

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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xem

function u(t) {

for(n=.5,i=9e3;n=t/4*n*(1-n),i--;)i<300&&x.fillRect(t*99,1e3-n*1e3,2,2)

Jan 31 2020 4:44 PM UTC

}// 71/140

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Logistic map (to scale)

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xem

function u(t) {

c.width^=0
if(!t){B=[],X=Y=0}
c.onmousemove=e=>B.push([e.x-X,e.y-Y,X=e.x,Y=e.y])
for(i of B)x.arc(i[2]+=i[0],i[3]+=i[1],9,0,7)
x.stroke()

Mar 21 2018 8:26 PM UTC

}// 137/140

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The mouse throws projectiles (works better in fullscreen)

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xem

remix of d/3325 by u/xem

function u(t) {

for(i=0;i<65;i++)for(j=0;j<65;j++)x.fillStyle=R(i*9,j*9,C(t)*99),x.fillRect(900+400*S((i+t/9)*3)*C((j+t/9)*1.5),500+400*S((j+t/9)*1.5),5,5)

Oct 21 2017 9:43 AM UTC

}// 139/140

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Some kind of Jupiter-y, Easter-egg-y thing?

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xem

function u(t) {

c.style='background:radial-gradient(red,blue);position:absolute;transform:rotateX('+t*99+'deg)rotateY('+t*50+'deg)rotateZ('+t*10+'deg)';

Mar 11 2017 11:13 AM UTC

}// 136/140

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#thinkoutsidethecanvas

u/hypothete

Definitely a lot terser than gradients in the canvas. Color stop stuff gets wordy.

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xem

function u(t) {

eval(unescape(escape`𨐽𜀻𨠽𚁨𛁺𚐽🡸𛡦𪑬𫁒𩑣𭀨𞐹𚰨𨐫𚰩𚠲𞐰𛀹𞐬𞐹𛁨𚠹𚐻𮀮𩡯𫡴🐢𜰹𬁸𘁡𘠻𮀮𩡩𫁬𥁥𮁴𚀢𤱏𥑒𠱅𘀨🠱𜀰𪰩𘀭𘁍𢑎𢑆𢑅𡀠𚀾𝐰𪰩𘀭𘁚𢑐𘀨𜐵𪰩𘀭𘁒𣱁𡁒𣱌𣁅𤠠𚀱𜰮𝑫𚐠𛐠𡑃𥀠𚀱𜰮𜁫𚐢𛀹𛀳𜀩𞱢𚀹𞐩𞱢𚀵𜀩𞱢𚀱𝐩𞱢𚀱𜰮𝐩𞱢𚀱𜰩`.replace(/u../g,'')))

Aug 9 2024 5:16 PM UTC

}// 140/140

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Typical #js13k #gamedev experience... don't be afraid to make a big game: after minification, zip, roadroller and ECT, your entry will easily fit in 13,312 bytes

u/cantelope

zip comes after roadroller ;)

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xem

function u(t) {

x.font="99px a";
for(i=999;i--;)x.fillText("🕷",1870/2+C(i+t)*t*9*3/i+9*Math.random(),1030/2+S(i+t)*t*9*3/i+9*Math.random())

Dec 31 2017 10:37 AM UTC

}// 123/140

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Cobweb challenge entry :p

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xem

remix of d/690 by u/xem

function u(t) {

i=~~(t*10);x.font="99px a";x.clearRect(0,0,9999,999),x.fillText("U+"+(1E9+i.toString(16)).slice(-6)+" = " + String.fromCodePoint(i),300,600)

Feb 20 2017 9:07 PM UTC

}// 140/140

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More info and demos: https://github.com/xem/miniUnicode

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xem

function u(t) {

for(i=j=0;i<118;){x.fillRect(j%18*99,~~(j/18)*99,90,90),j+={0:17,3:11,11:11,55:54,87:54,69:-68,101:-68}[i++]|1}

Feb 17 2017 10:17 PM UTC

}// 111/140

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u/joeytwiddle

It's the periodic table of elements!

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xem

function u(t) {

for(i=0;i<192;i++){
for(j=0;j<108;j++){
x.fillStyle="#"+((t*200+j*20+i*j*10*t+t*(i+j))|99);
x.fillRect(i*10,j*10,10,10);
}
}

Mar 27 2020 10:32 AM UTC

}// 124/140

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Random test :)

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xem

remix of d/7398 by u/xem

function u(t) {

c.width^=c.onmousemove=e=>B.push([e.x-X,e.y-Y,X=e.x,Y=e.y])
B.map(i=>(x.beginPath(),x.fillRect(i[2]+=i[0],i[3]+=i[1],9,9)))};{B=[X=Y=0]

Mar 21 2018 9:02 PM UTC

}// 135/140

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