Dweets awesomed by u/eviltoad

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: #Opposites

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codeslaw

function u(t) {

m=400
x.fillRect(0,0,c.width|=i=m*5,i)
x.globalCompositeOperation='screen'
while(i--)x.fillText('💙❤️💚',990+S(t/i**.1)*m,550+S(i/t**.02)*m)

Mar 31 2017 8:50 PM UTC

}// 138/140

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Analog

Show more comments…
u/magna

OMFG
u/nonce

oh my, this is great.
u/nonce

I feel like this might open the floodgates with people making use of the globalCompositeOperation setting... if only it was shoter :-p
u/codeslaw

You take a 30-40 char hit depending on which mode, but there's still room for fun :D
u/donbright

doesnt seem to work on linux chrome or linux firefox
u/codeslaw

Ah bummer

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donbright

remix of d/1399 by u/Kalanchoe

function u(t) {

c.width^=0
t?o.push({X:1,Y:1,U:S(t),V:C(t)}):o=[]
o.map(a=>{Q=a.X**2+a.Y**2,a.X+=a.U-=a.X/Q,a.Y+=a.V-=a.Y/Q,x.fillRect(a.X,a.Y,9,9)})

Mar 28 2017 1:45 AM UTC

}// 133/140

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Another fake gravity sim. This time, some particles get slingshotted out of the system, past escape velocity, others teeter on the brink, and others congregate at 0,0. After a while, the screen is full of a bunch of particles leaving, and others coming back in towards the origin.

Show more comments…
u/nonce

your gravity sims are amazing.
u/z3vin

agreed
u/donbright

thanks this site is very inspiring
u/alien

WOW ,Hi what does this mean :D c.width^=0
u/donbright

alien it basically clears the screen to the default width. in detail, i think it is combining "binary xor" with "set equal to", so basically c.width = c.width xor 0, and since anything xored with 0 is itself, its basically setting c.width to itself.
u/donbright

#physics

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donbright

remix of d/1816 by u/SpecialAgent

function u(t) {

t?Δ=[]:P=[99,0,0,0,1,0,0,.6]
for(Q=i=4;i--;)Q+=(Δ[i]=P[(2+i)%4]-P[i])**2/2
for(j=4;j--;)x.fillRect(P[i=j*2],P[i+1],2,2),P[j]+=P[j+4]+=Δ[j]/Q

Mar 24 2017 11:16 PM UTC

}// 140/140

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Quickstart - alter numbers in P for fun patterns. Long description - this is a simulation of two body gravitational motion using a simplified form of Calculus.

u/donbright

combine F=ma with F=GM1M2/R^2 except that G=1, M1=1, M2=1 and r^2 is r
u/donbright

Explanation here https://www.patreon.com/posts/simulating-in-…
u/donbright

oh btw P[x1,y1,x2,y2,xv1,yv1,xv1,yv2] where 1,2 = object 1,2, x,y=position, v = velocity initial
u/codeslaw

This is incredible!
u/donbright

#physics

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magna

remix of d/2172 by u/magna

function u(t) {

c.width=w=1920;h=1080;n=128;m=72;s=w/n;for(i=n*m;i--;X=i%n,Y=i/n,b=S(X/Y+t*t),x.fillRect(X/n*w,Y/m*h,b*s,b*s));

Mar 17 2017 7:16 PM UTC

}// 111/140

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u/recursive

like a corn field from the drivers' seat

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mxfh

function u(t) {

for(x.drawImage(c,b=n=0,-16),i=w=960;a=C(i/w*4),b=!b,i-->-w;n+=C(t*i*i),x.fillStyle=R(e=b*w,e,e))x.fillRect(i+b+w,a>0?w+a*a*n*2+b*4:w,2,w)

Mar 13 2017 10:35 PM UTC

}// 138/140

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dwitter Album Cover Art https://blogs.scientificamerican.com/sa-visu… (deleted the prior version)

Show more comments…
u/donbright

wonderful
u/SpecialAgent

Nice homage to a great band :)
u/p01

Super smart implementation! Wish I saw it before I did https://www.dwitter.net/d/2958
u/zanella

I saw i--> and thought it was a new JS operator. :)
u/lionleaf

#album #album_cover
u/mxfh

#unknownpleasures #joydivision
u/rodrigo.siqueira

Here is the original Ph.D. dissertation page where this were published: https://twitter.com/ChristiansenJen/status/1…

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codeslaw

function u(t) {

for(c.width|=0,i=6;i<10;i++){for(e=0;e<352;++e){
x.arc(e*7-400,S(e/194)*i*130-300,99+C((e-t*35)/i)*C(e/10)*20,7,0)}x.stroke();x.beginPath()}

Mar 12 2017 10:05 PM UTC

}// 140/140

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u/recursive

Lumpy intestines?
u/codeslaw

Aren't we all? :D

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recursive

remix of d/1983 by u/jes5199

function u(t) {

t*=60
s=1<<29
for(b=1081;--b;){
	c=(t-960)*3
	d=(b-540)*3
	v=c*c-d*d
	g=v*~s+v*s //looks bloated, but is magic
	v+g>0&&x.fillRect(t,b,1,1)
}

Mar 9 2017 4:39 PM UTC

}// 140/140

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Dweet tech demo: Convert to single precision float without the bulky "Float32Array". Pixel for pixel repro of 1983.

u/jes5199

nicely done!

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recursive

remix of d/1976 by u/recursive

function u(t) {

for(d=256;--d;)for(X=-32;++X<32;x.fillRect(960+X*8e3/d,100+7e4/d-h,120,9))x.fillStyle=R(h=(C(a=d/9+t*6)+C(X/9+a/3))*35,g=h+C(X^d)*6+90,g/.8)

Mar 9 2017 12:33 AM UTC

}// 140/140

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Bluer waves

Show more comments…
u/sfz

Incredible
u/sigveseb

Epic
u/FireFly

This is crazy, great stuff :D
u/iverjo

Best water on dwitter thus far!
u/iverjo

I also tried to achieve this some time ago, but yours is much more convincing
u/iverjo

https://www.dwitter.net/d/65 and https://www.dwitter.net/d/254 and https://www.dwitter.net/d/295 and https://www.dwitter.net/d/366
u/recursive

Your idea gives really great color to the surface. I wonder if it's possible to animate the colors using your idea, and the wave geometry and lighting using mine.
u/magna

(ノಠ益ಠ)ノ彡┻━┻
u/Renaud___

very very nice
u/jsizzle

Seriously amazing. Wow
u/SpecialAgent

Bravo
u/ideokan

i am a web developre, feeling like a dumb monkey in here
u/PiggyClone205

Welcome to the club, ideokan.
u/Godcranberry

This sis amazing, totally my favorite
u/Godcranberry

is* mb fam
u/iverjo

#water
u/hollo47

#ocean
u/katkip

#waves
u/vain

Very nice and lovely wave

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scottglz

remix of d/1855 by u/scottglz

function u(t) {

with(x){c.width^=0;F=f=>110+S(t*f)*100;for(i=9;i--;beginPath(),lineWidth=250,setLineDash([F(i),F(1)]),arc(-90,-90,270*i,0,2),stroke());}

Mar 7 2017 8:53 PM UTC

}// 136/140

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u/danjah

this one's great!

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walsh9

remix of d/1872 by u/walsh9

function u(t) {

c.width|=Y=(d,e,a,l)=>l?(x.moveTo(d,e),x.lineTo(d+=l*9*C(a),e+=l*9*S(a)),Y(d,e,a*C(t),--l),Y(d,e,a*S(t),l)):0;Y(700,999,4.71,15),x.stroke()

Mar 4 2017 6:11 PM UTC

}// 140/140

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