Top #circleChallenge dweets

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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veubeke

remix of d/18403 by u/BriSeven

function u(t) {

t?(A=X+C(R=Math.random()*99)*10)*A+(B=Y+S(R)*10)*B<9e4&&(X=A,Y=B):X=Y=0
x.fillStyle=`hsl(${t*6},50%,50%)`
x.fillRect(X+960,Y+540,10,10)

Apr 22 2020 10:12 AM UTC

}// 135/140

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Random Walk #circlechallenge

u/donbright

absolutely fascinating...
u/donbright

i let it run for an hour or two and it filled up almost the whole circle, its very interesting

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BriSeven

function u(t) {

X=(t%1)*600-300,Y=t*10-300
if(Math.sqrt(X*X+Y*Y)<300)x.fillRect(X+950,Y+540,10,10)

Apr 22 2020 2:49 AM UTC

}// 82/140

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#circlechallenge

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Xen

function u(t) {

t?x.transform(z=C(3),Z=S(3),-Z,z,0,!x.fillRect(0,0,9,399)):x.translate(960,540)

Apr 21 2020 6:13 PM UTC

}// 79/140

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#circlechallenge

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andrea270872

function u(t) {

t?x.rotate(7):x.translate(99,99)
x.fillRect(55,55,4,4)

Nov 9 2021 6:44 PM UTC

}// 54/140

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#circlechallenge just for fun :)

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cantelope

function u(t) {

x.font='2500px a',x.fillText('○',190,1245)

Nov 6 2021 10:13 PM UTC

}// 42/140

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#circlechallenge :D

u/danny@hille.dk

39 cheatpoints->x.font='25in '+x.fillText('○',190,1250)

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rep_movsd

function u(t) {

[P,Q]=t?[A,B]:[0,1]
x.fillText(0,99*(B=Q*.8-P*.6)+960,99*(A=P*.8+Q*.6)+540)

Nov 5 2021 9:00 AM UTC

}// 75/140

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Circle2 #circlechallenge

Show more comments…
u/rep_movsd

This is based on an algorithm from "Electron Graphics and Sound" I read as a kid
u/rep_movsd

This is based on an algorithm from "Electron Graphics and Sound" I read as a kid
u/rep_movsd

We calculate a sine and cosine of a small angle delta initially, and thereafter derive them using trig identities using only addition and multiplication
u/rep_movsd

It so happens that C(O) and S(O) are almost exactly 0.8 and 0.6 for some O
u/rep_movsd

I found those by for(N=0.1;N<1;N+=.1) M=(1-N*N)**.5,console.log(N,M)
u/rep_movsd

Can be 67 bytes
u/rep_movsd

Can be 67 bytes
u/rep_movsd

[P,Q]=t?[P*.8+Q*.6,Q*.8-P*.6]:[0,1] x.fillText(0,99*Q+960,99*P+540)

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rep_movsd

remix of d/24281 by u/danny@hille.dk

function u(t) {

x.fillText(t?O=500:Y=X=300,O+X,O+Y)
X+=Y,Y-=X,X+=Y*.99

Nov 5 2021 8:04 AM UTC

}// 54/140

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Circle #circlechallenge

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BriSeven

remix of d/18368 by u/veubeke

function u(t) {

π=3.14
T=(x)=>π-(.5*x/π%1)*π*2
c=(x)=>(y=(x*x)**.5,16*x*(π-y)/(5*π*π-4*y*(π-y)))
x.fillRect(950,540,c(T(t+π/2))*300,c(T(t))*300)

Apr 24 2020 2:46 PM UTC

}// 128/140

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Bhaskara's Sine Approximation Formula #circlechallenge

u/BriSeven

what's kinda weird is the value of pi doesn't seem to matter much, it still makes a great looking circle.

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katkip

function u(t) {

t?0:c.outerHTML=`<svg height="300" width="300"><circle cx="150" cy="150" r="150" fill="#f00"/></svg>`;

Apr 24 2020 10:20 AM UTC

}// 102/140

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working #svg #circlechallenge visible on HC theme

u/donbright

clever

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katkip

function u(t) {

if(!t){c.width=500;x.translate(244,140)};for(i=9;i--;)x.fillRect(i*10,(5*t)%20,5,20);x.rotate(1)

Apr 23 2020 1:11 PM UTC

}// 96/140

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#circlechallenge made by default

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