Dweets awesomed by u/artfarnaa

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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Agnes

function u(t) {

with(x)for(c.width|=j=200;j--;fill())beginPath(r=~~(j/20)),arc(960+r*50*S(a=.314*(j%20))+25*S(M=t*S(t+j/200)),540+50*r*C(a)+25*C(M),2*r,0,7)

Jul 23 2018 10:20 AM UTC

}// 140/140

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Gelatinous tunnel

u/Xen

Nice!
u/aleamb

Coool!!
u/recoder

Hypnotic!
u/fujimotos

#tunnel

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DataMeta

function u(t) {

for(i=108;i--;)j=C(t-i)*4*i,k=Math.log(i*i)*i,x.setTransform(k,0,0,k,960,540),x.rotate(i^t|i),x.fillStyle=R(j*3,i*2,i-j),x.fillRect(0,0,1,1)

Jul 19 2018 11:30 PM UTC

}// 140/140

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u/Xen

nice style
u/DataMeta

j=C(i-frame)*t for 'turbo' mode, j=C(i-frame)*i for Xen ;) photosensitivity warning for the latter]
u/DataMeta

tabbed into wrong field, accidental comment ^

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mvs202

function u(t) {

c.width|=0
for(i=0;i<8;i++){
a=i+t
x.fillStyle=R(j=64*i,8,8,.3)
x.beginPath()
x.moveTo(w=960,h=540)
x.arc(w,h,h-j,a,a+3*(1+C(a)))
x.fill()
}

Jul 16 2018 12:46 AM UTC

}// 140/140

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u/lionleaf

stylish!

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atgz

remix of d/8839 by u/DataMeta

function u(t) {

for(c.width|=i=256;i--;)
x.fillRect(960+2*i*C(t+i*.979),512+S(t-i)*i*2,i/9,i/9)

Jul 12 2018 1:51 PM UTC

}// 79/140

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my name jeff

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Xen

remix of d/8829 by u/UnacceptableUse

function u(t) {

for(x.beginPath(c.width=-1,i=299);i--;x.arc(150,85,t*t%i,i-t,t));x.stroke()

Jul 8 2018 6:14 PM UTC

}// 75/140

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Reality-Traverse

u/magna

Nice!
u/DataMeta

Cool! Just keeps on giving
u/micahcowan

#Rlyeh

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fujimotos

function u(t) {

c.width=320
for(j=12;j--;)for(i=90;i--;)
x.fillStyle=`hsla(99,${i}%,${i}%,.9`,
x.fillRect(S(t+i/30+S(j))*20+20*j,S(t*5+i/10)+i*2,i/2,i/2)

Jul 4 2018 1:09 PM UTC

}// 137/140

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Weird Plants

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keithclark

function u(t) {

for(c.width=240,Z=5;Z>0;Z-=.1)for(Y=X=-60;X<60;x.fillRect(120+X++/Z*9,45-Y/Z,1/Z*24-Z,99))I=C(X*.4^Z+t*6),Y+=7*I,x.fillStyle=R(Z*50-Y*I/3)

Jul 3 2018 4:27 PM UTC

}// 138/140

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I'm working on a version with green mountains and water but I need to shave a few bytes of this one first. Suggestions welcome

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u/alien

wow very nice
u/alien

is this what they call raymarching?
u/aleamb

yeeeeeeeeeeeeeeeeeeahh awesomeee!
u/aleamb

#3d #landscape #awesome
u/Agnes

Both 240, 120 and 60 are multiples of 60 so I think you can lose bytes by making 60 a constant... somehow. Right?
u/keithclark

@alien - no raymarching here. This is a cos() generated waveform, drawn from back to front.

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DataMeta

remix of d/8474 by u/DataMeta

function u(t) {

c.width|=0;p=Math.PI;for(i=18;i--;)x.lineWidth=7,x.rotate(p*2),x.arc(960,540,(Math.abs(512*S(t*i/16))),t/i,i*t/p),x.stroke()

Jul 3 2018 5:18 AM UTC

}// 124/140

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t/i -> i for more uniform geometry

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Feiro

remix of d/8739 by u/firegodjr

function u(t) {

with(x)for(fillRect(0,0,k=2e3,k);k--;beginPath(fillStyle="#0001"))arc(960,540,k/4,v=k%4*1.57+S(t*3-k/280)+t,v+.2),strokeStyle="red",stroke()

Jun 28 2018 11:07 AM UTC

}// 140/140

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red is shorter than any other color! :D

u/firegodjr

Looks like a rose :D
u/Agnes

For the record, strokeStyle="tan" is as short as red.
u/magna

R(k) also seems to work
u/zanella

You can replace 1.57 with 1.6, and use this extra byte to use hex colors instead of red, like #0f0. ;)
u/zanella

Or, if you want to keep it really precise, replace *1.57 with /.64.

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magna

remix of d/8757 by u/micahcowan

function u(t) {

c.width|=D=C(r=3*S(t))
x.setTransform(1+9*D,U=S(r)*5,0,9+D,825-40*U,99*D)
for(i=9;--i;x.fillRect(-52.5+i*10,40,5,20))x.fillStyle=R(D<0&&255)

Jun 27 2018 5:38 AM UTC

}// 140/140

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Show more comments…
u/micahcowan

😍
u/micahcowan

Very useful shortcuts, I'll have to use them in future. ...I'm thinking like a C programmer - in the C standard the order in which arguments are evaluated is unspecified; apparently the ES standard strictly defines order-of eval to be the intuitive left-to-right order. Good to know!
u/micahcowan

Ha, it feels "wrong" to set fillStyle 9 times in a row. But a great way to eliminate that last little character!
u/micahcowan

#default
u/magna

When you're out of characters you can shave "legally", you have to start compromising and enter the "wrong" and/or "meh, it's just a good approximation" territory :)
u/magna

Like Math.PI * 2 === 7
u/micahcowan

Heh, totally. :D
u/pythech

hack to save 2 chars: x.fillStyle=R(-D*9e7)
u/pythech

I guess that's "meh" territory
u/magna

@pythech nice!

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