Dweets awesomed by u/ds0

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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pavel

function u(t) {

with(x)for(c.width|=j=88,scale(9,9);i=j-->>3;arc(107+3*(9-i)*S(p/2),60,6*i,A=(j%8-6||beginPath(stroke()))*11/7+p/4,A))p=S(a=5*t-i/5)+a

Feb 9 2019 11:07 PM UTC

}// 134/140

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Square dance #beesandbombs

u/katkip

#loop

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due

remix of d/12249 by u/pavel

function u(t) {

for(c.width|=p=2*Math.PI,x.scale(9,9),i=13;j=i--*p/4;x.arc(107+45*C(A=j-t/4+i*p/12),60+45*S(A),14,(a=(t+j)%p)-1,a));x.stroke()

Feb 9 2019 9:27 PM UTC

}// 126/140

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Looks like a trippy fidget spinner

u/katkip

XD

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rodrigo.siqueira

function u(t) {

Xp=X=Y=t/800
x.globalAlpha=.1
for(i=2e3;i--;){
X=Xp*Xp-Y*Y+.9*Xp-.6013*Y
Y=2*Xp*Y+2*Xp+.5*Y
Xp=X
x.fillRect(1300+X*820,740+Y*400,2,2)
}

Feb 9 2019 3:14 PM UTC

}// 135/140

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Tinkerbell Map is a chaotic #attractor dynamical system, as described in https://en.wikipedia.org/wiki/Tinkerbell_map

u/rodrigo.siqueira

"Origin of the name: the graphical picture shows a similarity to the movement of Tinker Bell over Cinderella Castle, as shown at the beginning of Disney films."
u/katkip

You can replace Xp with p

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23_Skidoo

remix of d/12194 by u/23_Skidoo

function u(t) {

for(s=24,d=480,i=4e3;i--;f=C(X/d+t/2)/T(Y/d+s)+t,x.fillStyle=`hsla(${S(f/6)*d} 66%${40+S(f*6)*s}%`)x.fillRect(X=i%81*s,Y=~~(i/81)*s,s,s)

Feb 9 2019 5:58 AM UTC

}// 136/140

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pavel

remix of d/12230 by u/pavel

function u(t) {

for(c.width|=p=2*Math.PI,x.scale(9,9),i=13;j=i--*p/6;x.arc(107+45*C(A=j-t/4+i*p/12),60+45*S(A),14,a=(t+j)%p,a));x.stroke()

Feb 8 2019 8:33 PM UTC

}// 122/140

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I like how the corners are "walking"

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Xen

function u(t) {

for(c.width|=i=99,x.fillRect(0,0,3e3,2e3);i--;x.fill(x.arc(1e3+C(Z=i*t/14)*i*8,500+S(Z)*i*8,9,0,7)))x.beginPath(x.fillStyle=R(199))

Feb 8 2019 6:17 PM UTC

}// 131/140

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Orbit X demake

u/Xen

also try changing the arc radius from 9 to i

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katkip

function u(t) {

for(c.width|=i=4;i--;f(960,540,99,i*11))f=(X,Y,s,n)=>s&&x.beginPath()|x.fill(x.arc(X,Y,s*2,0,7))|f(X+S(t+n)*s*3,Y+C(t+n)*s*3,s/2,-t*2)

Feb 8 2019 5:49 PM UTC

}// 134/140

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Thing that rotates #recursive thanks for u/Xen and u/metamero for help with golfing

u/DataMeta

Interesting

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katkip

remix of d/12241 by u/katkip

function u(t) {

s=123456;c.width*=1;{f=(X,Y,p)=>{S((X&Y)+s*C(s*s))<0?x.fillRect(X,Y+25,30,5):x.fillRect(X,Y,5,25)};for(i=77;i--;)for(j=43;j--;)f(i*25,j*25)}

Feb 8 2019 4:44 PM UTC

}// 140/140

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Seeded maze! 6 digits seed! change the s constant!

u/robbyg

#maze

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username

remix of d/12216 by u/cantelope

function u(t) {

for(c.width=w=2e3,i=99;i--;x.font=h+'px q',x.fillText(`.`,w-(t*(w+h)/5)%3e3,i**7%w+S(i+t*3)*i*3))x.fillStyle=`hsl(${(h=i*i)+t*99} 67%83%`

Feb 8 2019 4:35 PM UTC

}// 137/140

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uncompressed

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katkip

remix of d/12236 by u/butcherfly

function u(t) {

q=t/4;for(i=0;i<198;i++){x.fillStyle=R(128+C(t*25-i/9)*128);x.beginPath();x.arc(960+S(i*q+t)*200,540+C(i*q+t)*200,1200-6*i,0,7);x.fill()}

Feb 8 2019 12:27 PM UTC

}// 138/140

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