Dweets awesomed by u/sigveseb

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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lowpoly

function u(t) {

for(o=10;o--;)with(c){if(!t){i=j=k=l=1;w=width=399;h=height=101;}k*=(i<=0||i>=w)?-1:1;l*=(j<=0||j>=h)?-1:1;x.fillRect(i+=k,j+=l,1,1)}

Jan 4 2018 12:47 AM UTC

}// 133/140

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Hello guys. I need ideas on how can i optimize this thingie :)

u/lowpoly

and yea, the k*=(i<=0||i>=w)?-1:1; l*=(j<=0||j>=h)?-1:1; part concerns me most
u/joeytwiddle

Well this is 2 chars shorter: if(j<=0||j>=h)l=-l; // and this is the same: (j<0||j>h)&&(l=-l); // You could also drop the four =s for a small loss in quality.
u/sigveseb

Looks nice!

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corruptio

remix of d/5423 by u/aemkei

function u(t) {

for(c.width|=i=h=999;i--;)x.fillText(0,h+(i*h-i*i)**.5*S(t+i),i)

Jan 4 2018 12:42 AM UTC

}// 64/140

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golfier

u/lurifax

Nice golfing!
u/iverjo

#sphere

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Erazed

function u(t) {

w=c.width=2e3;h=5e2;for(i=1e-3;i<9;){X=1e3+i*99*C(3*t/i);Y=h+i*99*S(3*t/i);x.moveTo(X,Y);x.arc(X,Y,i++<1?60:i>6?25-2*i:i<5?i:3,0,9)}x.fill()

Jan 3 2018 11:25 PM UTC

}// 140/140

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aemkei

remix of d/5293 by u/Xen

function u(t) {

for(c.width|=i=h=999;i--;)x.fillRect(h+h*(2e5-(i-500)**2)**.5/h*S(t+i),i,9,9)

Jan 3 2018 9:50 PM UTC

}// 77/140

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u/iverjo

Wow, only 77 characters
u/iverjo

#sphere

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p01

function u(t) {

for(c.width=n=128;n-=r=i=1/64;x.fillRect(n%2*64,n/2,k/32,1))for(Y=1-n*i,X=n%2-1,k=32;--k/r;i=j)j=2*r*i+X*S(t)-Y*C(t),r=r*r-i*i+Y*S(t)+X*C(t)

Jan 3 2018 9:41 PM UTC

}// 140/140

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Spinning Mandelbrot set

u/magna

We're going to need a bigger CPU.
u/iverjo

Nice effect! 22 FPS on my machine, in Firefox. Surprisingly, it runs much slower in Chrome and Edge (4 FPS)
u/sigveseb

Screeching by at 4FPS on my machine too :D nice mandelbrot though
u/donbright

feel like standing up and applauding. unbelievable.
u/rodrigo.siqueira

#mandelbrot #fractal

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robbyg

remix of d/5417 by u/robbyg

function u(t) {

x.fillStyle='hsl('+(t*5.6)%360+',50%,50%)';x.fillRect(960+C(t/2)*400+C(t*3.7)*100,540+S(t/2)*400+S(t*3.7)*100,9,9)

Jan 3 2018 9:40 PM UTC

}// 114/140

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veubeke

function u(t) {

t*60&127?0:T=[0,L=.001]
S=[c.width^=0]
T.map((_,i)=>S[i*2-1]=(_+T[i-1])/2+(Math.random(x.fillRect(i,540-_,2,S[i*2]=_))-.5)/L)
T=L<2?S:T
L*=2

Jan 3 2018 8:09 PM UTC

}// 140/140

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Simple terrain generation using midpoint displacement

u/iverjo

Nice alternative to perlin noise!
u/sigveseb

Very nice! And with the horizontal flat line we can pretend that is the sea level; everything above is a mountain and everything below is the sea :)
u/iverjo

#random

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ellisk1

function u(t) {

T=t%6*4;if(T<.2)c.width+=0;for(i=T;i<19;i++)x.fillStyle=R(0,0,0,(T+19)/3e3),w=250*(2+C(i/3))*C(T/8+i/12),x.fillRect(960-w/2,30+50*i,w,50)

Jan 3 2018 7:58 PM UTC

}// 137/140

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u/sigveseb

woooow hourglass!

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Exca

function u(t) {

c.width|=t/=25
x.fillStyle=R(0,0,0,.1)
q=(w,o)=>{b=S(w/10+t)*7+960+o,v=180+w*10
x.fillRect(b,v,w,1080-v);}
for(j=54;j--;)q(j,S(t*j)*900)

Jan 3 2018 6:08 PM UTC

}// 138/140

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u/sigveseb

kefrens bars! (alcatraz bars? :D )
u/Exca

Indeed, with a pendulum swing
u/Exca

Had a version with ropes coming from top and each of the bars as squares. Couldn't get that one under 156 characters though.

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eviltoad

remix of d/5381 by u/eviltoad

function u(t) {

c.width=1920;
for(i=0;i<1920*4;i++){
  x.fillStyle=R(i*C(t),i*S(i),S(t)+T(t));
  x.fillRect(i/4,550+S(t/4+i)*100*i*(t%4)/300,25,25)}

Jan 3 2018 5:51 PM UTC

}// 132/140

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