Dweets awesomed by u/donbright

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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magna

remix of d/24293 by u/magna

function u(t) {

e='🍎'
eval(unescape(escape`󨼮󭽩󩍴󪍼󟜰󞽸󛭦󪝬󫍔󩝸󭌨󩜬󜜰󛌱󝌩󞽸󛭳󨽡󫍥󚌶󜌬󝬰󚜊󩭯󬬨󪜽󝜷󝬻󪜭󛜻󮌮󩭩󫍬󤭥󨽴󚍩󙬳󜜬󪜾󟬵󛌱󛌱󚜩󮌮󩭩󫍬󤽴󮝬󩜽󤬨󛬮󛭸󛭧󩝴󢝭󨝧󩝄󨝴󨜨󜌬󜌬󜼲󛌱󞌩󛭤󨝴󨜮󬽬󪝣󩜨󫼽󪜪󝌬󫼫󜼩󚜻`.replace(/u../g,'')))

Nov 4 2021 9:42 PM UTC

}// 125/140

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Pixellated emoji renderer. Change value of e.

u/magna

*pixelated
u/danny@hille.dk

uncompressed -> if(!t){for(x.fillText('🍎',10,14),i=576;i--;x.fillRect(X*60,Y*60,60,60))x.fillStyle=R(...x.getImageData(X=i%32,Y=i>>5,1,1).data.slice(0,3))}
u/danny@hille.dk

Pick your fruit with caution... for(x.font='1cm z',x.fillText('🍑',-11,22),i=576;i--;x.fillRect(X*60,Y*60,60,60))x.fillStyle=R(...x.getImageData(X=i%32,Y=i>>5,1,1).data)

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ArthurThuczsec

function u(t) {

t?x.fillText(9,0,3):c.width=5

Nov 4 2021 5:23 PM UTC

}// 29/140

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#circlechallenge

u/rep_movsd

c.width=99,x.fillText('O',45,29)
u/donbright

lol nice

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lerc

remix of d/23842 by u/sandromiccoli

function u(t) {

r=Math.random
for(i=899;i--;)R=r()*300,A=r()-t*3+R/94,x.fillRect(960+R*S(A),540+R*C(A),3,3),x.clearRect(960+R*S(A-=3),540+R*C(A),4,4)

Nov 4 2021 8:31 AM UTC

}// 133/140

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u/magna

Very cool!
u/Xen

nice!

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ciaccodavide

remix of d/24286 by u/ciaccodavide

function u(t) {

!t&&x.fillRect(0,0,2e3,2e3)
r=Math.random
for(n=13;X=r()*2e3,a=r()-.5,n--;)for(i=2e3;i--;)x.clearRect(X+a*(i-540),i,.2*Math.abs(540-i),t<.1)

Nov 3 2021 3:46 PM UTC

}// 140/140

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fragments

u/taupelink

Cool! I see a 3-D effect
u/donbright

yeah its like a city with spotlights shining into the sky, mirrored in water,.... or maybe like a gigantic hallway with really shiny floors and white ceilings with spires coming down to the floor as support

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ciaccodavide

function u(t) {

!t&&x.fillRect(0,0,2e3,2e3)






















































for(i=540;i--;)x.clearRect((r=Math.random)()*1920,i*2,1,1)

Nov 3 2021 3:33 PM UTC

}// 140/140

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u/Xen

tricky lol, nice
u/donbright

amazing

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magna

function u(t) {

R=540,Y=R-t*99
for(s=0,d=-1;s<=R*R-Y*Y;s+=d+=2);
X=d/2
x.fillRect(960-X,R+Y,X*2,1)

Nov 2 2021 10:36 PM UTC

}// 82/140

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#circlechallenge No trig, no direct square root: Just using the Pythagorean theorem + the fact that sums of odd numbers give perfect squares

u/Xen

very clever sir

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magna

remix of d/24280 by u/magna

function u(t) {

c.width=f=255,k=40*(t+8)
for(i=f;i--;)for(j=f;j--;x.fillRect(i,j,1,(X*X+Y*Y)**S(t)**2-.2+S(k*X)*S(k*Y)*S(k/20/f)+(i&j)&1))X=i/f-.5,Y=j/f-.3

Nov 2 2021 6:46 PM UTC

}// 139/140

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Magic!

Show more comments…
u/magna

Keeps evolving #waitforit
u/cantelope

dafuq
u/magna

It all started with d/24264 courtesy of u/Jabo
u/taupelink

wow
u/Joachim

#sierpinski
u/Xen

love it!
u/donbright

beautiful
u/andrea270872

terrific stuff... I will have to study every character of your code!!
u/Jabo

Hero
u/joeytwiddle

magic ❤️

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donbright

function u(t) {

限=199
for(m=-限;m<限;m+=(2+t))for(n=-限;n<限;n+=(3+t)){
g=2*m*n
b=m*m+n*n
r=m*m-n*n
x.fillRect(1920/2+frame*g/b,1080/2+frame*r/b,1,1)}

Nov 2 2021 3:12 PM UTC

}// 130/140

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As part of #circlechallenge I go back to the old rational parametrization of the circle from Wildberger's "chromogeometry", which has elements of Euclid. Each frame draws rational points on a circle, and each frame the radius gets bigger. All of the patterns are a kind of optical illusion.

u/donbright

changing '2' and '3' to different numbers will give different patterns

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cantelope

function u(t) {

x.fillRect(960+((b=t?b:[0,h=520,h/22.7,0])[0]+=b[2]),h+(b[1]+=b[3]),9,9,b[2]-=b[0]/h,b[3]-=b[1]/h)

Nov 2 2021 12:30 PM UTC

}// 98/140

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#circlechallenge (no sine/cosine)

u/donbright

does fillrect have 6 parameters here?
u/cantelope

heh. it only looks at the first 4. i'm not actually saving any space by including 6 parameters, but why not? :)
u/cantelope

can you see how this circle method works? there is an array with 4 elements, the first 2 being positions (x,y), and the last 2 being analogous to a vector (in physics) with magnitude and direction, or simply (velocity-x, velocity-y). The velocity vector is added to the position coordinates once per frame and is itself adjusted in a way to create a perfectly circular "orbit" about the origin. Interestingly, this approach can be extended into 3 or more dimensions, and involve, obviously, more than 2 bodies. 3-body orbital chaos can be very interesting and beautiful, e.g. https://code.dweet.net/full/2w8z

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magna

remix of d/24275 by u/magna

function u(t) {

c.width=f=99
c.style.filter='sepia('
for(a=f*f;a--;x.fillRect(i=a%f,j=a/f|0,.7,Math.hypot(X=i/f-.5,Y=j/f-.3)-.2+S(k*X)*S(k*Y)*S(t)))k=f*t

Nov 2 2021 4:30 AM UTC

}// 137/140

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