Dwitter - javascript demos in 140 characters

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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taupelink

remix of d/15450 by u/taupelink

function u(t) {

for(i=d=e=f=1e3;i--;x.fillText(r,99+d*z|7,z+e*z|7))[d,e,f]=[(r=Math.random(z=240)*8|0)+f*C(d),r%3+f*(r%2?T(d):S(d)),(r%2+f)/2]

Aug 21 2019 5:11 PM UTC

}// 126/140

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Like d/15450, but with #chaosgame indices plotted

u/sigveseb

cool one!

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metamero

function u(t) {

throw t?T++:T=0

Aug 21 2019 1:54 PM UTC

}// 15/140

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what is the deal with that init dweets? 15B

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taupelink

remix of d/15489 by u/taupelink

function u(t) {

for(i=19;i--;x[s](400+S(t)*300+50*i,400,50,200))s=['clear','fill'][i%2]+'Rect'

Aug 23 2019 1:54 PM UTC

}// 78/140

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I think someone else did this version of #default recently, but I'm not finding it...putting it here for reference in case it hasn't already been done exactly this way

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katkip

remix of d/15467 by u/django

function u(t) {

w=c.width*=1;k=40;f=w/k
for(i=0;i<k*2;i++)for(j=0;j<k;j++)p=j/k,x.fillStyle=R(0,p*255,200-i*j),x.fillRect(i*f-600,540,f,S(C(j*i/f+t))*211/p)

Aug 21 2019 12:52 PM UTC

}// 140/140

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veubeke

function u(t) {

t?T++:T=[]
throw T;

Aug 21 2019 4:57 AM UTC

}// 19/140

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Counter example

u/kyleminto97

I saved a whopping three characters haha - throw t?T++:T=0;
u/jylikangas

throw frame
u/KilledByAPixel

throw t|0 Save 2 more chars, it just counts a bit slower ;)

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taupelink

remix of d/15469 by u/taupelink

function u(t) {

for(i=d=e=f=1e3;i--;x.fillRect(d*z,e*z,h=f/(1+f),h))[d,e,f]=[(r=8+Math.random(z=92)*z|0)/5+(r%5/8+f)*C(d-f),r%11+(f+9/r)*C(d/2+r),r%2+f/4]

Aug 23 2019 2:53 AM UTC

}// 138/140

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d/15498

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rodrigo.siqueira

remix of d/15411 by u/rodrigo.siqueira

function u(t) {

v=(a,b,Φ,r)=>{for(i=0;i++<r;x.globalAlpha=.05)x.fillRect(a-=S(Φ),b-=C(Φ),s=r/42,s)
r>8&&v(a,b,Φ+S(t*i**9)/4,r*=.9)}
v(960,540+300*C(t),t,99)

Aug 20 2019 1:03 AM UTC

}// 140/140

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Dendritic projections

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tomxor

remix of d/15454 by u/katkip

function u(t) {

a ++
throw a
}{a=1e3

Aug 19 2019 7:28 PM UTC

}// 20/140

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Variable initialisation with only +2 chars (hack)

u/tomxor

Saves up to 4 chars vs t||(a=1e3);
u/katkip

Ohh
u/katkip

#genius #exploit I didnt know about that. This is clever

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Benjiji

function u(t) {

c.width^=0
N=999*S(t/10)
for(i=0;i<N;)Z=2*i/N-1,Y=S(i*0.2)*Z*0.3,X=C(i++*0.2)*Z+Y*C(0.7),Y=Z+Y*S(0.7),x.fillRect(X*300+960,-Y*300+540,15,5)

Aug 19 2019 9:18 PM UTC

}// 139/140

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#hourglass #runningtime

Show more comments…
u/Benjiji

Did not find a way to get it to start over more quickly in 140...
u/13thptr

Multiplying by 0.2 is equivalent to dividing by 5 (gain 2 bytes each time) and cos(0.7rad) is roughly 0.76 which can be written .76
u/13thptr

also moving c.width^=0 to the first part of the for loop saves 2 bytes
u/13thptr

123 : N=999*S(t/10) for(c.width^=i=0;i<N;)Z=2*i/N-1,Y=S(i/5)*Z*.3,X=C(i++/5)*Z+Y*.76,Y=Z+Y*.64,x.fillRect(X*300+960,-Y*300+540,15,5)
u/13thptr

*126: N=999*S(t/10);for(c.width^=i=0;i<N;)Z=2*i/N-1,Y=S(i/5)*Z*.3,X=C(i++/5)*Z+Y*.76,Y=Z+Y*.64,x.fillRect(X*300+960,-Y*300+540,15,5)
u/Benjiji

Nice, thx!
u/atgz

you can also use .7 instead of 0.7, might come in handy next time

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metamero

remix of d/15478 by u/metamero

function u(t) {

throw a++}{a=0

Aug 21 2019 1:56 PM UTC

}// 14/140

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14B cheater init demo (only works after posting)