Dweets awesomed by u/rep_movsd

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

function u(t) {

x.clearRect(0,0,S=c.width,C=c.height);x.beginPath();x.arc(S/2,C/2,C/3,0,6.28*-t,1);x.lineCap='round';x.lineWidth=C/20*(1-t);x.stroke()

Aug 24 2017 4:02 AM UTC

}// 134/140

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dweet player loader mark 1

u/magna

#dweetplayerloader

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FireFly

function u(t) {

for(i=2e3;!t&&i--;Math.random()>(X**2+(Y-4)**2)**.5/6&&f(7)+f(-7))X=i&3,Y=i>>2&7,f=m=>x.fillRect(240*(i>>5&7)+120-X*m,180*(i>>8)+50+Y*7,7,7)

Aug 20 2017 3:53 PM UTC

}// 140/140

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Spritegen! Generates 48 random sprites each time the dweet is run (make a change to rerun the dweet)

Show more comments…
u/sigveseb

I love this!
u/alien

wait WHAT !!
u/alien

D: What is going on here!! how
u/iverjo

How does it work?
u/FireFly

It's a dweetification of an older sprite generator of mine. The idea is to take a "mask" of 0..1 floats and filter a grid of random numbers for when num<mask. In this case the mask is based on euclidean distance from centre. This is done for half the sprite, and then the other half is just mirrored
u/FireFly

(You could also view it as flipping a biased coin for each mask value, with the bias given by the mask)
u/FireFly

The same principle would work just as well with larger sprites too, and more exotic/interesting mask shapes. The same rid of random numbers could be applied to different masks, or to an animated mask, to produce an animation between sprites, too!
u/nystrand

so cool!
u/joeytwiddle

Awesome. I love it. Every single one looks like a space invader!
u/iverjo

Interesting technique. Thanks for explaining :) Also, I agree with joeytwiddle
u/jick

Got a link to the original sprite generator?
u/FireFly

I never really wrote it to be shared, so it's all hardcoded and with really ugly code. I put together this animation though: https://twitter.com/FireyFly/status/80072288…
u/statenlogic

Simple, but effective! Makes me want to play 8-bit games again.
u/donbright

genius
u/joeytwiddle

#hiddengem
u/stiaje

#witchcraft
u/tomxor

#bitmap #sprite
u/KilledByAPixel

#generative pixelart
u/KilledByAPixel

#pixelart

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FireFly

function u(t) {

for(i=7e3;i--;x.fillRect(X*20,Y*20,20,20))X=i%96,Y=i>>7,x.fillStyle=`hsl(${X>>4<<6},99%,${(X&&X%16<15&&S(X*.4+t)*3+48>Y&&!!Y*2-(4<Y))*50}%)`

Aug 13 2017 11:34 PM UTC

}// 140/140

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Rainbow banners!

u/sigveseb

Damn sweet!

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alien

function u(t) {

W=c.width=200;v=(X,Y,R)=>[S(Y+t)*C(X+t)*R+100,S(X+t)*C(Y+t*.5)*R+50]
for(i=0;i<130;i++)
x.lineTo(...v(144*i,5+i*.5,i))
x.stroke()

Aug 11 2017 7:44 AM UTC

}// 129/140

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kchplr

function u(t) {

x.fillStyle='#0001';for(x.fillRect(0,0,2e3,2e3),i=0;i<6.29;Y=S(i*2+t),X=(C(2*i)+C(t+i+Y)),x.clearRect(960+X*450,536+Y*500,20,9))i+=.002

Aug 5 2017 2:42 PM UTC

}// 135/140

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A glowy curve, inspired by the inverted colors of https://www.dwitter.net/d/3015 by Cantelope

u/kchplr

Noticed it is very slow in firefox, has lot of artefact on Safari and doesn't even render properly in stable Chrome. The only browser rendering it correctly is Chrome Canary. Oh, well.
u/kchplr

Here is a version which renders correctly on stable Chrome : for(x.fillStyle='rgba(0,0,0,.1)',x.fillRect(0,i=0,2e3,2e3);i<7;Y=S(i*2+t),X=(C(2*i)+C(t+i+Y)),x.clearRect(960+X*450,536+Y*500,20,9))i+=.002

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FireFly

remix of d/3005 by u/FireFly

function u(t) {

for(i=5e3;Z=(i--%4>1)+i/128;i%4||x.beginPath(x.fill()))X=i%128+2>>2,x.fillStyle=R(Y=S(X*X/32+Z*Z/32-X-Z-t*6)*80+99),x.lineTo(X*60,Z*35-Y)

Aug 3 2017 9:03 PM UTC

}// 137/140

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Ripples! With proper quads instead. Add +Z*X-Z*16 after X*60 for perspective projection too (brings it up to 146)

u/FireFly

Another byte can be saved with with(x), but this causes a fair bit of slowdown for me. Thanks for some golfing tips from qfox and others on the jsgolf slack :)
u/cantelope

can't stop watching. def in my top 10 favs
u/iverjo

Very impressive!

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New_Core

remix of d/2874 by u/New_Core

function u(t) {

b=c.width|=1,d=350
X=10*S(t)
Y=10*C(t)
for(i=d;i--;x.fillRect(X*Z+960,Y*Z+540,Z,Z))Z=d/(9+d-i%d),X+=6*C(a=i/50-9*S(t/8)*S(i/9)),Y+=6*S(a)

Aug 3 2017 7:36 AM UTC

}// 137/140

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u/13thptr

#d3

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FireFly

function u(t) {

for(i=5e3;i--;i%4||x.beginPath())Z=i/128+i%2,X=i/4%32+(i%4>1),x.fillStyle=R(Y=S(X*X/32+Z*Z/32-X-Z-t*6)*80+99),x.fill(x.lineTo(X*60,Z*35-Y))

Aug 2 2017 9:02 PM UTC

}// 139/140

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Ripples!

u/alien

Respect

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New_Core

remix of d/2962 by u/FireFly

function u(t) {

a=c.width|=0;for(i=40;i--;x.fill())i%2>0?a=500:a=0,x.fillStyle=`hsla(${i*9},99%,50%,.4)`,x.lineTo(960+a*S(i*.698+t),i>20?a:-a+999)

Jul 31 2017 6:25 PM UTC

}// 130/140

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Made my own little try to reduce the code a bit..

u/Xen

125b my try #2983
u/FireFly

Nice! the i%2>0 can be further simplified to i%2 for another -2ch (applies to xen's too)
u/13thptr

#diamond #d3

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New_Core

function u(t) {

c.width|=0
for(i=60;i--;)x.beginPath(),x.arc(960+i*10*S(t+i/99),540+200*C(t*2+i/9),a=99*S(3+i/6)+120,0,7),x.fillStyle=R(0,99,0),x.fill()

Jul 30 2017 11:08 AM UTC

}// 136/140

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Wasnt what I was going for but funny enough to post ;)

u/sigveseb

amost feels a little metaball-y
u/iverjo

This is rad, man! How does it work?
u/joeytwiddle

Funny effect :) Using i-=6 shows up some sine waves
u/iverjo

#metaballs

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