Dweets awesomed by u/donbright

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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Current theme challenge: #Food

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katkip

remix of d/9697 by u/katkip

function u(t) {

if(!t){c.width^=0;for(i=-1;i++<63;)for(j=0;j++<36;)x.font="1.1cm n",x.fillText("DWITTER"[7*Math.random()|0],i*30+frame%30,j*30)}

Sep 7 2018 2:04 PM UTC

}// 128/140

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Dwitter #maze

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katkip

remix of d/9696 by u/katkip

function u(t) {

if(!t){c.width^=0;for(i=-1;i++<63;)for(j=0;j++<36;)x.font="1.2cm n",x.fillText("╱╲"[Math.random()*2|0],i*30,j*30)}

Sep 7 2018 1:57 PM UTC

}// 114/140

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#maze

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katkip

function u(t) {

if(!t){c.width^=0;for(i=-1;i++<63;)for(j=0;j++<36;)x.font="1.2cm n",x.fillText("◣◢◤◥"[Math.random()*4|0],i*30,j*30)}

Sep 7 2018 1:55 PM UTC

}// 116/140

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Triangle #maze

u/donbright

cool use of unicode
u/Xen

Love it!

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donbright

function u(t) {

c.width=2e3
for(i=0;i<t*t;i++){Φ=Math.acos(1-2*i/t/t)
Θ=10.1664*i
x.fillRect(
500*(2+C(Θ)*S(Φ)*S(t)+C(Φ)*C(t)),
500*(1+S(Θ)*S(Φ)),9,9)}

Sep 7 2018 4:57 AM UTC

}// 135/140

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Evenly spaced points on a sphere, based on CR Drost's phyllotaxis sunflower cylyndrical equal area map in python: https://stackoverflow.com/questions/9600801/…

u/joeytwiddle

Useful! #sphere
u/Odog8

Love me a PHI sphere in the morning!

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f8f82804

remix of d/9617 by u/cantelope

function u(t) {

c.width=480;x.translate(w=240,130);x.rotate(S(t));for(i=17;i--;x.lineTo(w*.7*S(p=1.57*i-t+(g=i/4|0)*11)/(Z=2+C(p)),w*(g%2-.5)/Z));x.stroke()

Sep 6 2018 9:32 PM UTC

}// 140/140

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compound 3D rotations #d3 #cube #perspective

u/donbright

awesome
u/cantelope

neat trick :)
u/f8f82804

#wireframe

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f8f82804

function u(t) {

if(t%1<.01)c.width=480,s=t%8<.01?'l9 0l7 -7l7 7':s+s.replace(/([-.\d]+) ([-.\d]+)/g,(m,a,b)=>a/2+' '+-b/2),x.stroke(new Path2D('M0 9'+s))

Sep 6 2018 5:49 PM UTC

}// 137/140

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proof-of-concept using #regex replacement rules to create self-similar #path2d

u/donbright

thats fascinating

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katkip

function u(t) {

x.translate(5*S(t/2),5*C(t));x.fillRect(340,480,50,50)

Sep 6 2018 2:28 PM UTC

}// 54/140

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x.translate instead of x.drawImage is better? O_O Dwitter Snippets Test 4

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katkip

remix of d/9683 by u/katkip

function u(t) {

x.fillStyle=`hsl(${t*99},99%,50%)`;for(i=0;i++<t;)β=t/frame-(t--+ t--+1)/2,x.fillRect(400+i*100+S(++β)*300-t*99,540+S(++β)*540,50,50)

Sep 6 2018 2:19 PM UTC

}// 133/140

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Perfect #default C-Orbits. They are never touching

u/donbright

fascinating.....

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katkip

function u(t) {

for(i=0;i++<75;)for(j=0;j++<41;)x.fillStyle=`hsl(${9e3/i*9e3/j+t*90},99%,50%)`,x.fillRect(i*25,j*25,25,25)

Sep 6 2018 1:44 PM UTC

}// 106/140

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Dwitter snippets test 2

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f8f82804

remix of d/9674 by u/f8f82804

function u(t) {

with(x)for(i=c.width^=0;i--;beginPath(fill()))C(a=2*t-i)>0&&arc(960+((s=750+330*S(t))*i-i*i)**.5*S(a),s-i,18*C(a)*(1-(i*2/s-1)**2)**.5,0,7)

Sep 5 2018 10:40 PM UTC

}// 139/140

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#sphere

u/donbright

thats cool... how does it work?
u/joeytwiddle

Very nice! #halftone
u/f8f82804

u/donbright: I used the parameterization from d/5600. I like it a lot because it keeps fairly even density of dots on the surface. It's based on cylindrical coordinates where each point is at a different vertical level and the points spiral around. The key is that not all values of i result in drawing a dot. We drop the back half of the sphere with C(a) >0, but we also implicitly drop points where s*i-i*i is negative
u/donbright

thanks... fascinating...

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