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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sawaxon

remix of d/1620 by u/sawaxon

function u(t) {

c.width=1920;for(j=1;j<9;j++)for(i=1;i<390;i++)x.fillRect(900+C(i)*400,500+S(i)*6*S((t+20)*5*j/50)*70,2,4);

Feb 28 2017 8:26 PM UTC

}// 107/140

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Lappi

remix of d/1613 by u/sawaxon

function u(t) {

c.width=1920;x.font='9em a';for(j=0;j<9;j++)for(i=0;i<119;i++)x.fillText('🌈',j*i*20,T((100+t)*i/100),80,4);

Feb 28 2017 8:02 PM UTC

}// 107/140

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Lappi

remix of d/1611 by u/Lappi

function u(t) {

c.width=1920;
x.font='9em a';
for(i=0;i<19979;i++)x.fillText('🌈',999+T((100+t)*i)*500+C(i)*100,500+S((10+t)*i)*500+S(i)*150,500,500);

Feb 28 2017 7:55 PM UTC

}// 133/140

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btc@codebro.com

function u(t) {

var Z=(S(t)+1)/2*255
x.fillStyle=R(Z,Z,Z/6,1)
x.fillRect(0,S(t)*400+400,100*t,50)

Feb 28 2017 7:51 PM UTC

}// 82/140

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donbright

remix of d/1232 by u/iverjo

function u(t) {

a=2e3;c.width=a;for(i=2*a;i--;)p=S(t)*i/a+i%4/.637,d=C(p)-S(p),d>0&&x.fillRect(a/2+99*(S(p)+S(t)),i/4,99*d,1/(d+1)),x.fillStyle=R(i/9,d*a/8)

Feb 25 2017 1:54 AM UTC

}// 140/140

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u/iverjo

Nice :) Better colors than mine
u/iverjo

By saving golfing 2 characters I managed to make the twister bigger:
u/iverjo

c.width=a=2e3;for(i=2*a;i--;)p=S(t)*i/a+i%4/.637,d=C(p)-S(p),d>0&&x.fillRect(a/2+199*(S(p)+S(t)),i/4,199*d,1/(d+1)),x.fillStyle=R(i/9,d*a/8)
u/iverjo

A little more movement: c.width=a=2e3;for(i=2*a;i--;)d=C(p=S(t)*i/a+i%4/.637)-S(p),d>0&&x.fillRect(a/2+199*S(p)+399*C(t),i/4,199*d,1/(d+1)),x.fillStyle=R(i/9,d*a/8)
u/donbright

wow that is awesome!!! i really do miss how yours spins all the way around.
u/donbright

#twister

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CynderR

function u(t) {

c.width^=0;for(i=2;i<2e3;i+=2)s=3/(3.1-(t+i/90)%3),x.beginPath(),j=i*16+S(i*4+t+S(t)),x.lineWidth=s*s,x.arc(960,540,s*49,j,j+.5),x.stroke()

Feb 28 2017 6:42 PM UTC

}// 139/140

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recursive

function u(t) {

x.beginPath()
x.fillStyle=R(p=t*96+S(t*32)*5,128+p,p)
for(i=0;i<7>t;x.lineTo(r*C(i+=.01)+960,r*S(i)+540))r=S(i*2%3.1)**.4*600*(1-t)
x.fill()

Feb 26 2017 4:37 AM UTC

}// 140/140

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Cloverleaf with wavy gradients. Requires ** operator.

u/donbright

awesome graients
u/donbright

gradients

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SpecialAgent

function u(t) {

a=1103515245,c=12345,m=0x7fffffff,z=t;for(i=111;i--;)z=((a*z+c)%m),g=z&0x3fffffff,z=((a*z+c)%m),h=z&0x3fffffff,x.fillRect(g%1e4,h%1e3,9,9)

Feb 24 2017 8:19 PM UTC

}// 138/140

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A pseudo-random number generator. The parameters you see is used in glibc, it gives a good visual on distribution. If you changed m=0x80000000 (m as used in IBM's C/C++) you will quickly see a bias in the randomness. Oh the irony! Here are some other popular parameters you can try: Borland C/C++: a=22695477,c=1,m=0x100000000 Turbo Pascal: a=134775813,c=1,m=0x100000000 Visual Basic 6: a=1140671485,c=12820163,m=0x1000000 Java: a=25214903917,c=11,m=0x1000000000000 Many more: https://en.wikipedia.org/wiki/Linear_congrue… 🕶

Show more comments…
u/iverjo

This is the probably the best PRNG dweet thus far
u/sigveseb

cool stuff
u/issafly

fullscreen it and stare into it like one of those stereograms for the extra special good.
u/SpecialAgent

thanks folks! also the speed is crippled for dramatic effect, change the loop to "for(i=1e3;i--;)" for turbo mode.
u/iverjo

Speaking of stereograms, it would be cool if anyone could create a stereogram dweet
u/SpecialAgent

Sorry for the malformed link to wikipedia, here is the corrected URL: https://en.wikipedia.org/wiki/Linear_congrue…

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gabrielsroka

remix of d/1334 by u/gabrielsroka

function u(t) {

e=Math.random;with(x)for(i=j=2e3;t%1<.01&&i--;)lineWidth=10,strokeStyle=R(r=e()*255,r,r,.5),beginPath(),moveTo(i,0),lineTo(e()*j,j),stroke()

Feb 26 2017 5:35 PM UTC

}// 140/140

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Based on code written by Casey Reas and Ben Fry. see http://processingjs.org/learning/basic/rando…

u/donbright

still freezes my browser
u/gabrielsroka

@donbright, it paints once per second. is that what you mean by "freeze"?
u/joeytwiddle

Nice. Looks like hair.
u/iverjo

#random #texture

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kchplr

function u(t) {

for(c.width^=0,i=3e3;i--;r=i/30,e=S(t*.7)*.02,w=1e3,z=100+S(i*2+r*e)*600,y=S(C(i+t)),Y=y,x.fillRect(w+w*y,r*2.5+400+z*y*.5,8*Y,7*Y));

Feb 26 2017 9:40 AM UTC

}// 133/140

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Spent some time trying to compress it, but forgot to remove the Y=y. Should be 129 bytes instead of 133.

u/sigveseb

if you do z=99.. instead of z=100.. you can get an extra byte!
u/kchplr

aah, indeed thanks!
u/kchplr

Just figured out the last statement in the for loop can also be placed in the loop body to save two more bytes. I'm new to this codegolfing thing...
u/kchplr

Actually, the first statement, not the last..