Dweets awesomed by u/Niklas

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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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… 🕶

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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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iverjo

remix of d/89 by u/iverjo

function u(t) {

c.width^=0;for(i=5e3;i--;)p=3*t+S(t/2)*i/3e3+i%4/.637,d=C(p)-S(p),d>0&&x.fillRect(960+199*S(p)+249*S(t/.7+i/6e3),i/4-2,199*d,1/(d+1))

Feb 24 2017 6:50 PM UTC

}// 133/140

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u/SpecialAgent

nicely done!
u/Kalanchoe

Flawless!
u/donbright

oh wow, the shading!
u/sigveseb

Good twister! Can we add color?
u/iverjo

Color would be awesome :) Feel free to try to add it
u/sigveseb

https://www.dwitter.net/d/1267 red
u/iverjo

Here's a purple version. Had to make some compromises. https://www.dwitter.net/d/1278
u/donbright

i attempted a rainbow version https://www.dwitter.net/d/1282
u/iverjo

#twister
u/vain

nice twister

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iverjo

remix of d/104 by u/iverjo

function u(t) {

c.width^=0;for(i=9;i<2e3;i+=2)s=3/(9.1-(t+i/99)%9),x.beginPath(),j=i*7+S(i*4+t+S(t)),x.lineWidth=s*s,x.arc(960,540,s*49,j,j+.6),x.stroke()

Feb 24 2017 6:47 PM UTC

}// 138/140

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u/SpecialAgent

my hat goes off to you sir!
u/Kalanchoe

That's unbelievable
u/iverjo

Try this one in fullscreen for a more immersive experience
u/Niklas

impressive!
u/donbright

:)
u/aendrew

This is incredible.
u/vonzo

reminds me to Gescom <3
u/hvge

http://www.pouet.net/prod.php?which=3397 ❤️
u/badthai

How did you come up with this?
u/iverjo

@badthai: First I made a classic tunnel effect (like this: https://www.dwitter.net/d/205). Then I made several remixes of it by tweaking parameters. This was one of the results. See also https://www.dwitter.net/d/106
u/iverjo

#tunnel
u/vain

cool segmented tunnel fly

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iverjo

remix of d/379 by u/iverjo

function u(t) {

c.width=960;for(i=2e3;i--;)x.fillRect(480+460*S(d=i/42)*S(b=2.79*i+t),270+160*(C(d)+T(t/9+d)),s=7/(S(d)*C(b)+2),s)

Feb 24 2017 6:41 PM UTC

}// 114/140

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u/donbright

great 3d effect
u/iverjo

Thanks :)
u/hamptonio

really nice
u/5Mixer

Epic!

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Niklas

function u(t) {

r=Math.random,!t&&(p={x:960,y:540,c:0,d:0}),p.c+=2*r()-1,p.d+=2*r()-1,p.c*=.9,p.d*=.9,p.x+=p.c,p.y+=p.d,x.fillRect(p.x,p.y,3,3);

Feb 24 2017 4:23 PM UTC

}// 128/140

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Brownian molecular motion

u/danni

This resembles my signature when the UPS guy visits.

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Niklas

function u(t) {

cX=c.width/2,cY=c.height/2,r=cY/2,pX=cX+S(t)*r,pY=cY+C(t)*r,r-=2*t,dX=pX+S(32*t)*r/4,dY=pY+C(32*t)*r/4,x.lineTo(dX,dY),x.stroke();

Feb 24 2017 2:42 PM UTC

}// 130/140

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gormisdomai

remix of d/1192 by u/gormisdomai

function u(t) {

c.width=1920;
for(i=0;i<200;i++)
x.fillRect(950+T(t+i)*900, 0, 20, 2000)
for(i=0;i<200;i++)
x.fillRect(0, 350+T(t+i)*900, 2000, 20)

Feb 24 2017 2:33 PM UTC

}// 131/140

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"Dislocation #3"

u/katkip

#tagfail

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Niklas

function u(t) {

for(c.width|=0,e=960,f=540,r=260,i=r+1;i--;)a=.02417*i+t,g=S(t)*r,h=C(t)*r,x.lineTo(e+g+C(a)*r,f+h+S(a)*r),i%2&&x.lineTo(e+h,f+g);x.stroke()

Feb 24 2017 1:16 PM UTC

}// 140/140

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Drum

remix of d/683 by u/mxfh

function u(t) {

c.width=w=1920;π=Math.PI/2;λ=2;r=w/4;for(φ=-π;φ<π;φ+=.5/r){λ+=.3;x.lineTo(C(φ)*S(λ-t)*r+w/2,(C(t)*S(φ)-S(t)*C(φ)*C(λ-t))*r+r)}x.stroke()

Feb 24 2017 11:42 AM UTC

}// 136/140

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u/iverjo

#sphere

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Niklas

function u(t) {

for(c.width|=0,e=960,f=540,r=f/2,g=128,i=0;i<=g;i++)a=i*(6.284/g)+t,x.lineTo(e+S(t)*r+C(a)*r,f+C(t)*r+S(a)*r),i%2&&x.lineTo(e,f);x.stroke();

Feb 24 2017 11:33 AM UTC

}// 140/140

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u/5Mixer

I love how images like this produce artifacts because of pixel scale, makes them interesting to look at :D

dwitter.net | Niklas (4536)