Dweets awesomed by u/magna

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.

Try the new frontend: beta.dwitter.net
Current theme challenge: #Food

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sfz

function u(t) {

s=255
z=s/3
m=~~(t*t)
a=m%2?s:z
b=m%2?z:s
for(i=s*2;i--;)x.fillStyle=R(i%2?a:b,z,i%2?b:a),x.fillRect(i%23*z-9,z*~~(i/23)-9,z,z)

Apr 18 2017 5:51 AM UTC

}// 127/140

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Seizure Warning!!! - but after about 30 seconds this should briefly look uniformly purple

u/Polyducks

I can see forever!!!
u/joeytwiddle

It was briefly purple for me but then it starting flipping on and off again. #horrible

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magna

remix of d/2420 by u/magna

function u(t) {

c.width|=0;for(j=9;j--;)for(i=100;i--;s=S(t),X=i%5+j*10+s*30,Y=i/5|0,S(Y+t*7)/4<Math.random()&&x.fillRect(400+X*10,400+Y*10,10,10));

Apr 18 2017 4:06 AM UTC

}// 132/140

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#default #noise

u/iverjo

#random

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neo

function u(t) {

v=255;x.arc(c.width/2+700*S(t*6.75),c.height/2+500*C(7.11*t),0,0,0);x.fill();x.fillStyle=R((v+v*C(2*t)),(v+v*S(1*t)),(v+v*S(5*t)),0.03)

Apr 18 2017 3:47 AM UTC

}// 135/140

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u/Polyducks

Wow! There's so many patterns

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magna

remix of d/1480 by u/magna

function u(t) {

c.width|=0
x.font='50px monospace';
(u+'')
.slice(0,t*3+S(t)*5)
.concat(t*2&1?'|':'')
.split('\n')
.forEach((s,i)=>x.fillText(s,0,++i*50))

Apr 18 2017 1:55 AM UTC

}// 138/140

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Pair programming nightmare

Show more comments…
u/joeytwiddle

that title made me Lol :D
u/sigveseb

:D
u/Jenky

That's a really clever illusion, love it
u/magna

Heh, thanks! Brought it down to 123 chars in hopes of adding occasional mistakes like skipped characters / typos etc., but couldn't immediately find a way. In case anyone wants to give it a shot: https://www.dwitter.net/d/2522
u/donbright

:o
u/Polyducks

Could you make a random function to skip odd spaces?
u/magna

It has to be a deterministic PRNG so that the places that are skipped are persistent. Otherwise, it would just look like a random flipping of characters. I thought about it, but couldn't immediately find a short solution.
u/Polyducks

That's a great point. Dwitter is such a mind twister!
u/highfestiva

Groovy baby!
u/magna

#quine
u/joeytwiddle

#funny

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sfz

function u(t) {

w=213
h=120
d=t?~~(t*60)%9?d:new Date%4:0
x.x=x.x||w
x.y=x.y||h
x.x+=d<2?d<1?1:-1:0
x.y+=d>1?d>2?1:-1:0
x.fillRect(x.x%w*9,x.y%h*9,9,9)

Apr 18 2017 1:27 AM UTC

}// 135/140

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eruonna

remix of d/2511 by u/eruonna

function u(t) {

a=[0,-1,0,1,0]
if(t){if(i>=0){d=(p[i--]+1)%4;p.push(d);j++;b+=a[d];c-=a[d+1];x.lineTo(b,c);x.stroke()}else i=j}else{p=[0];i=j=0;b=380;c=830}

Apr 17 2017 9:30 PM UTC

}// 140/140

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denser version

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eruonna

remix of d/2509 by u/eruonna

function u(t) {

a=[0,-9,0,9,0]
if(t){if(i>=0){d=(p[i--]+1)%4;p.push(d);j++;b+=a[d];c-=a[d+1];x.lineTo(b,c);x.stroke()}else i=j}else{p=[0];i=j=0;b=380;c=830}

Apr 17 2017 9:29 PM UTC

}// 140/140

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adjusted position to get more on the screen

u/donbright

:)

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eruonna

function u(t) {

a=[0,9,0,-9,0]
if(t){if(i>=0){d=(p[i--]+1)%4;p.push(d);j++;b+=a[d];c-=a[d+1];x.lineTo(b,c);x.stroke()}else i=j}else{p=[0];i=j=0;b=960;c=540}

Apr 17 2017 8:56 PM UTC

}// 140/140

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Works best in full screen, otherwise line is too thin

u/donbright

how does it work ?
u/eruonna

One way to draw the next iteration of the dragon curve is to take the previous iteration and then add it to itself backwards and rotated 90 degrees. Here p is the array of previous steps, j the index of the current step, and i walks backward through p. When i gets to the beginning, we set it equal to j and start over.
u/donbright

thanks, that is fascinating

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eruonna

function u(t) {

c.width|=0
t?o.push({x:960,y:540,X:C(t*9),Y:S(t*9)}):o=[]
o.map(p=>{x.fillRect(p.x,p.y,9,9),p.x+=p.X,p.y+=p.Y})
o=o.length<999?o:[]

Apr 17 2017 8:33 PM UTC

}// 131/140

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u/donbright

great minds think alike https://www.dwitter.net/d/2159

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MrM@_S

function u(t) {

if(!t)c.width=r=g=b=590
f=255
onmousemove=e=>{E=e.pageX;X=e.pageY}
onkeyup=e=>r+=b+=g+=2
x.fillRect(E,X,9,9)
x.fillStyle=R(r&f,g&f,b&f,.1)

Apr 17 2017 1:45 PM UTC

}// 138/140

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[paint editor] use the keyboard to change the paint and use your mouse to draw

u/magna

You can hijack a global that you don't use like S, C or T instead of E to avoid that initial "ReferenceError: E is not defined" error.
u/MrM@_S

oh thanks

dwitter.net | magna (131939)