Dweets by u/SpecialAgent

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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SpecialAgent

remix of d/1863 by u/SpecialAgent

function u(t) {

w=c.width=256;for(i=0;i<w*w;i+=16)X=i%w,Y=i/w>>0,P=64*(S(X/42)*S(Y/10-t)+t),x.fillStyle=`hsl(${P},70%,45%)`,x.fillRect(X,Y,16,16)

Mar 15 2017 5:18 AM UTC

}// 131/140

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u/donbright

this reminds me of plasma but .... different!

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SpecialAgent

function u(t) {

w=c.width=64;for(i=w*w;i--;)X=i%w,Y=i/w>>0,P=128+128*(S(X/8+t)+S(Y/8+t)+t),x.fillStyle=`hsl(${P},99%,50%)`,x.fillRect(X,Y,1,1)

Mar 4 2017 12:03 PM UTC

}// 128/140

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Old school plasma effect

u/iverjo

Good stuff
u/joeytwiddle

#plasma

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SpecialAgent

function u(t) {

if(!t)x.translate(960,542),w=1e3,s=42;for(i=0;i<t%90;i++)X=i*s,W=w-X,x.fillStyle=`hsl(${i*t*64},99%,70%)`,x.rotate(1),x.fillRect(0,0,W,42)

Mar 4 2017 7:04 AM UTC

}// 138/140

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SpecialAgent

function u(t) {

r=new Date%1e2
if(!t)x.translate(960,540)
x.rotate(-1e-2)
x.fillStyle=`hsl(${r},80%,${64-32*S(t)}%)`
x.fillRect(0,0+S(t)*500,2e3,40)

Mar 3 2017 1:28 PM UTC

}// 132/140

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SpecialAgent

remix of d/1813 by u/mihte

function u(t) {

c.width^=0
x.font='12em a'
x.translate(800,600)
q=1+S(frame*.1)*.1
x.scale(q,q)
x.fillText("❤️",0,0)

Mar 3 2017 10:06 AM UTC

}// 100/140

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SpecialAgent

function u(t) {

w=200,c.width=w;x.C=x.C||x.getImageData(0,0,w,w);for(i=w*w*4;i--;)x.C.data[i]=S(frame*.1+i*(1+t>>0))*255;x.putImageData(x.C,0,0)

Mar 3 2017 9:42 AM UTC

}// 128/140

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SpecialAgent

remix of d/1755 by u/SpecialAgent

function u(t) {

c.width^=0;r=60;for(n=6;n--,q=r*[1,2,3,5,6,9][n],d=t/[1,2,3,4,5,6][n];)x.arc(r*9,r*9,q,1,9),x.stroke(),x.fillRect(r*9+q*C(d),r*9+q*S(d),9,9)

Mar 3 2017 7:50 AM UTC

}// 140/140

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The approximate orbits of the newly discovered Trappist-1 system, three of the seven planets lie in the habitable zone. The innermost planet is not shown here.

u/sfz

I love these space science ones!
u/SpecialAgent

The outermost planet circles the sun around every 20 Earth days, that is a very tight year!
u/donbright

outstanding!

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SpecialAgent

function u(t) {

c.width^=0;r=400;A=[.4,.7,1,1.5,1,2,4,7];for(n=4;n--,q=r*A[n],d=t/A[n+4];)x.arc(r*2,r,q,1,9),x.stroke(),x.fillRect(r*2+q*C(d),r+q*S(d),9,9)

Mar 2 2017 10:55 AM UTC

}// 139/140

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Illustrates the orbits of the first 4 planets in our solar system. The distance from the sun (not shown but expected in the center) and the orbital periods are to approximate scale. Variable A holds the planetary data, positions 0-3 indicate the distance in Astronomical Units from the sun, positions 4-7 the number of days for orbital periods. These are rounded to fit into the 140 byte limit. Earth should be 3.65, but is rounded up to 4. Not perfect but a close approximation. q is the radius of each orbit (derived from the AU distance), and d is the angle of the planet on the orbital path (derived from the days per orbital period).

u/donbright

hell yeah
u/donbright

remix to show e-v orbital resonance https://www.dwitter.net/d/1811
u/donbright

i wish i could vote twice on SpecialAgent's dweet, so cool.
u/SpecialAgent

Thank you donbright :)
u/SpecialAgent

A golfed version that tunes earth's orbital period to 360 days, and speeds up the simulation: c.width^=0;r=600;for(n=4;n--,q=r*[.2,.3,.5,.75][n],d=t*2/[1,2,3.6,7][n];)x.arc(r,r,q,1,9),x.stroke(),x.fillRect(r+q*C(d),r+q*S(d),9,9)

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SpecialAgent

remix of d/1727 by u/SpecialAgent

function u(t) {

w=1920,h=1080,Ψ=[[9,h-9],[w-9,h-9],[w/2,9]],α=9,β=h-10;for(n=1000;n--;)x.fillRect(α,β,1,1),Δ=Ψ[Math.random()*3>>0],α=(α+Δ[0])/2,β=(β+Δ[1])/2

Mar 2 2017 5:26 AM UTC

}// 140/140

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Another Sierpinski fractal, this time generated via a RNG method.

u/donbright

cool

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SpecialAgent

function u(t) {

if(!t)c.width=900;for(Y=450,X=(t*60)>>0;Y--;)if(X&Y)x.fillRect(X,Y,1,1)

Mar 2 2017 12:14 AM UTC

}// 72/140

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I woke up at 1AM and realized I never played with Sierpinski triangles. What a shame!

u/donbright

very nice and simple
u/alien

Hi what does if(!t) mean :) ?

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