Dweets awesomed by u/robbyg

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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jylikangas

function u(t) {

for(c.width=i=608;i--;i%320<64&&i&2||i>447&i%32<5||x.fillRect(99+S(A)*(60+9*(i>255)),(i>>5)*11+Q*9,9+i%5,9))x.globalAlpha=Q=C(A=i/5.09+S(t))

Mar 23 2018 5:38 AM UTC

}// 140/140

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Spooky medieval tower

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u/Pjaerr

That's cool!
u/p01

I see what you did with the globalAlpha. Same trick as in https://www.dwitter.net/d/5747
u/aleamb

great!
u/sigveseb

A+++
u/joeytwiddle

coool
u/tomxor

This reminds me of the old game 'Nebulus": https://youtu.be/aI2UHTT18bs?t=28
u/KilledByAPixel

#castle
u/katkip

i bet you are the winner
u/vain

oh my god. absolutely unbelievable! as tomxor said - it reminds of the great Nebulus game

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robbyg

function u(t) {

t||(p='m 960 540',d=0);x.stroke(new Path2D(p+=['l',C(d+=.1)*t,S(d)*t].join(' ')))

Mar 22 2018 7:47 PM UTC

}// 81/140

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My first look at Path2D.

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xem

remix of d/7401 by u/xem

function u(t) {

c.width=innerWidth;c.onmousemove=e=>B.push([e.x-X,e.y-Y,X=e.x,Y=e.y])
B.map(i=>x.fillText("⚫",i[2]+=i[0],i[3]+=i[1]))};{B=[X=Y=0]

Mar 21 2018 9:11 PM UTC

}// 129/140

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u/yonatan

c.width=innerWidth is a great idea
u/xem

Move mouse to throw projectiles :)
u/xem

(c.width=innerWidth makes it work in fullscreen and not-fullscreen. Thanks to Balint Csala for the trick)
u/joeytwiddle

#interactive

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yonatan

function u(t) {

for(w=(c.width=h=i=2e3)/50;i--;x.fillRect(X+S(p=t*4-d)*30,Y+C(p)*30,9,9))d=((h/2-(X=w*i%(h+w*8)-w*2))**2+(540-(Y=(i/58|0)*w-w*2))**2)**.5/65

Mar 21 2018 5:41 PM UTC

}// 140/140

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remix of cantelope's https://codegolf.tk/a/189

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jkjustjoshing

remix of d/7270 by u/New_Core

function u(t) {

i=1920;
j=Math.abs
for(;i--;)x.fillStyle=R(255,(t*600-i/3)%999,255),x.fillRect(i,500+100*j(T(i/599))*S(j(i/90)),1,40)

Mar 21 2018 1:07 AM UTC

}// 117/140

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u/AnielaMW

x.fillStyle=R((t*600-i*2)%999,255,255),
u/AnielaMW

x.fillStyle=R((t*600-i/9)%999,255,255),
u/AnielaMW

Here is green, but no black background...
u/AnielaMW

x.fillStyle=R((t*600-i/9)%999,255,(t*600-i/9)%999),
u/AnielaMW

i=1920;j=Math.abs;for(;i--;)a=(t*600-i/9)%999,x.fillStyle=R(a,255,a), x.fillRect(i,500+100*j(T(i/599))*S(j(i/90)),1,40)
u/AnielaMW

still trying to get the black background
u/joeytwiddle

This is wrong but perhaps you can fix it: i=1920;j=Math.abs;for(;i--;)a=(t*600-i/9|0)%999,x.fillStyle=R(0,a,0),x.fillRect(i,a?500+100*j(T(i/599))*S(j(i/90)):0,1,a?40:999)

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Batrachus

function u(t) {

c.width*=a=1
for(i=32;i--;)for(j=0;j<18;x[f](d+10*S(b=Math.PI/2*~~(a=S(a*99)*2+2)),e+10*C(b),g,g))x[f="fillRect"](d=i*60,e=j++*60,g=50,g)

Mar 20 2018 4:51 PM UTC

}// 137/140

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u/Xen

very nice
u/taupelink

#maze

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robbyg

function u(t) {

w=c.width=192,t||(y=[54]);y.push(Y=y.pop(),Y+(Math.random()-.5)*4);y=y.slice(-w);for(i=y.length;i--;)x.lineTo(i,y[i]);x.stroke()

Mar 19 2018 6:01 PM UTC

}// 128/140

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Inspiration from @alien https://www.dwitter.net/d/5150

u/alien

this is nice, i guess i was trying to force it too much by using sine waves function...

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Agnes

function u(t) {

for(w=W=c.width=c.height=200;w--;)for(h=W;h--;)x.fillRect(w,h,(1+S(w&h+t))/2,((w&h)&t)/t);

Mar 19 2018 12:51 PM UTC

}// 90/140

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Arithmetic monochromatic pop art slideshow? Kinda?

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alien

remix of d/7375 by u/alien

function u(t) {

w=c.width=401,h=w/2
for(i=w;i--;)x.moveTo(h,h/2),X=C(i/h)*90,Y=h/2+h/(i-t%1),x.lineTo(h*X+i,h*2),x.moveTo(0,Y),x.lineTo(w,Y)
x.stroke()

Mar 18 2018 3:58 PM UTC

}// 136/140

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Final version thanks for the advice joey

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joeytwiddle

remix of d/7333 by u/Batrachus

function u(t) {

for(i=d=960,c.width=d;i--;x.arc(d/2+(j-.5)*S(t)*d/2,d/4+S(3*j)*d/8,M,0,7))j=i/d,M=d/2*Math.max(0,S(2.5*j+.6)/6-.06)+12;x.stroke()

Mar 18 2018 9:06 AM UTC

}// 129/140

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Smooth banana

u/joeytwiddle

We need x.beginPath() to draw filled circles, so instead this draws lots of hollow circles
u/iverjo

#banana

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