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AboutAll PostsWarningRandom

Flun Draw

  1. const canvas = document.createElement('canvas')
  2. const c = canvas.getContext('2d')
  3.  
  4. canvas.width = innerWidth * 2
  5. canvas.height = innerHeight * 2
  6. document.body.append(canvas)
  7. canvas.style.width = innerWidth + 'px'
  8. canvas.style.height = innerHeight + 'px'
  9. c.fillStyle = 'white'
  10. c.fillRect(0, 0, canvas.width, canvas.height)
  11.  
  12. const flun = (
  13.   ax = innerWidth,
  14.   ay = innerHeight,
  15.   r = 0,
  16.   x = 0, y = 0,
  17.   t = 0,
  18.   dt = 0,
  19.   spin = 0,
  20.   spinc = .1,
  21.   rinc = 0,
  22.   col = 'black',
  23.   hist = []
  24. ) => {
  25.  
  26.   const init = () => {
  27.     dt = Math.random() * Math.PI * 2
  28.     r = 0
  29.     rinc = Math.random() * 1
  30.     spinc = Math.random() * .01 - .005
  31.     col = ['black', 'white', 'rgba(0, 0, 0, 0.2)']
  32.       [~~(Math.random() * 3)]
  33.   }
  34.   init()
  35.  
  36.   return () => {
  37.  
  38.     spin += spinc
  39.     if (Math.random() < .005) {
  40.       init()
  41.     } else {
  42.       r += rinc
  43.     }
  44.  
  45.     if (Math.random() < .01) {
  46.       ax = x
  47.       ay = y
  48.       const inside = ax > 0 &&
  49.         ax < canvas.width &&
  50.         ay > 0 &&
  51.         ay < canvas.height
  52.       if (!inside) {
  53.         const p = hist[~~(Math.random() * hist.length)]
  54.         ax = p[0]
  55.         ay = p[1]
  56.       }
  57.       init()
  58.     } 
  59.  
  60.     t += (dt - t) / 22
  61.  
  62.     x = ax + Math.cos(t + spin) * r
  63.     y = ay + Math.sin(t + spin) * r
  64.  
  65.     if (x > 0 && x < canvas.width &&
  66.       y > 0 && y < canvas.height) {
  67.       hist.push([x, y])
  68.     }
  69.  
  70.     c.fillStyle = col
  71.     c.fillRect(x, y, 4, 4)
  72.   }
  73. }
  74.  
  75. const f = flun()
  76.  
  77. setInterval(() => {
  78.   for (let i = 0; i < 20; i++) f()
  79. }, 16)

Just randomly coded this one morning for a short – simple – but never did this exact motion before. It looks surprisingly organic and occasionally draws things that look like faces and other objects

// animation // canvas // drawing // golfed // graphics // javascript // math // random

T Plant

  1. const { PI } = Math
  2. const canvas = document.createElement('canvas')
  3. const c = canvas.getContext('2d')
  4.  
  5. canvas.width = innerWidth * 2
  6. canvas.height = innerHeight * 2
  7. canvas.style.scale = '.5 .5'
  8. canvas.style.transformOrigin = '0 0'
  9. document.body.append(canvas)
  10. let o = -PI / 2
  11.  
  12. const r = (n = 1) => Math.random() * n
  13.  
  14. function branch(x, y, ang = o, f) {
  15.   let vx, vy
  16.   let life = 0
  17.   let dead
  18.   let vv = 1 + r(2)
  19.   let ll = r(200)
  20.   let a = 1;
  21.   if (f) a = 0
  22.  
  23.   return () => {
  24.     if (dead) return
  25.     if (life > 200 + ll) {
  26.       dead = true;
  27.       let n = 10 + r(20)
  28.       for (let i = 0; i < n; i++) {
  29.  
  30.         let dest = {
  31.           x,
  32.           y: y + r(30) - 15
  33.         }
  34.         bs.push(leafPart(x, y, dest))
  35.       }
  36.     }
  37.  
  38.     life++
  39.     if (life > 10 && a >= 1 && Math.random() < .02 && bs.length < 20) {
  40.       if (r() < .3) {
  41.         dead = true
  42.         bs.push(
  43.           branch(x, y, ang + r(PI / 4)))
  44.         branch(x, y, ang + r(-PI / 4))
  45.         return
  46.       }
  47.       bs.push(
  48.         branch(x, y, o + r(2) - 1))
  49.     }
  50.     vx = Math.cos(ang)
  51.     vy = Math.sin(ang) * vv
  52.     ang += r(.1) - .05
  53.  
  54.     x += vx
  55.     y += vy
  56.     c.fillStyle = `rgba(255, 255, 255, ${a})`
  57.     if (f) {
  58.       a += .01
  59.     }
  60.  
  61.     c.fillRect(x, y, 4, 4)
  62.   }
  63. }
  64.  
  65. function leafPart(x, y, dest) {
  66.   let ang = r(7)
  67.   let rr = r(1) + .5
  68.   let vv = -r(3)
  69.   let life = 0
  70.   let maxLife = 40 + r(200)
  71.   let vx
  72.   let vy
  73.   let CC = 190 + r(30)
  74.  
  75.   return () => {
  76.     life++
  77.     if (life < maxLife) {
  78.       vx = Math.cos(ang) * rr
  79.       vy = Math.sin(ang) * rr + vv
  80.       x += vx
  81.       y += vy
  82.       ang += r(.4) - .2
  83.       c.fillStyle = 'rgba(255, 255, 255, .1)'
  84.     } else {
  85.       c.fillStyle = `rgba(255, ${CC}, ${CC}, .25)`
  86.       x += (dest.x - x) / 42
  87.       y += (dest.y - y) / 12
  88.     }
  89.  
  90.     c.fillRect(x, y, 4, 4)
  91.   }
  92. }
  93. let bs = []
  94. let lf = []
  95.  
  96. bs.push(
  97.   branch(innerWidth, innerHeight * 1.9, o, true)
  98. )
  99.  
  100. function loop() {
  101.   bs.forEach(b => b())
  102.   requestAnimationFrame(loop)
  103. }
  104. loop()

Been pretty consistently posting speed-coded youtube shorts. This is a recent one. Magic numbers, nonsense variable names, and strange noops 😀

See the short here…

// animation // canvas // codegolf // color // curves // graphics // hacks // javascript // random // speed-coded // speedcoding // tricks

Swrls

  1. const canvas = document.createElement("canvas");
  2. const c = canvas.getContext("2d");
  3.  
  4. canvas.width = innerWidth;
  5. canvas.height = innerHeight;
  6. document.body.append(canvas); 
  7.  
  8. const TWO_PI = 2 * Math.PI;
  9.  
  10. class Dot {
  11.   constructor(id, x, y, theta, parent) {
  12.     this.x = x;
  13.     this.y = y;
  14.     this.t = theta;
  15.     this.vx = Math.cos(this.t) * Math.random() * 2;
  16.     this.vy = Math.sin(this.t) * Math.random() * 2;
  17.     this.life = 30;
  18.     this.col = parent.col;
  19.  
  20.     if (Math.random() < 0.005) this.other = true;
  21.     if (this.other) {
  22.       this.life = 1000;
  23.       this.t = Math.random() * 7;
  24.       this.vx = Math.cos(this.t) * Math.random() * 2;
  25.       this.vy = Math.sin(this.t) * Math.random() * 2;
  26.       this.col = "black";
  27.     }
  28.     this.iter = 0;
  29.     this.parent = parent;
  30.     this.id = id;
  31.     this.alpha = 0.25;
  32.  
  33.     if (Math.random() < 0.3) this.alpha = 0.25;
  34.   }
  35.  
  36.   draw() {
  37.     this.x += this.vx;
  38.     this.y += this.vy;
  39.     this.iter++;
  40.     if (this.iter > this.life) {
  41.       delete this.parent.dots[this.id];
  42.     }
  43.     c.fillStyle = this.col;
  44.     c.globalAlpha = this.alpha;
  45.     if (!this.no) this.alpha -= 0.00125;
  46.     c.fillRect(this.x, this.y, this.parent.size, this.parent.size);
  47.   }
  48. }
  49.  
  50. class Stain {
  51.   constructor(x = innerWidth, y = innerHeight) {
  52.     this.x = x / 2;
  53.     this.y = y / 2;
  54.     this.num = 1;
  55.     this.step = TWO_PI / this.num;
  56.  
  57.     this.size = 1 + Math.random() * Math.random() * 2;
  58.     this.rad = Math.random() * 300;
  59.     this.dots = {};
  60.     this.dotId = 0;
  61.     this.col = Math.random() < 0.8 ? "white" : "black";
  62.     this.to = Math.random() * 7;
  63.     this.S = 20 + Math.random() * 50;
  64.     this.R = 100 + Math.random() * 300;
  65.     this.rr = 50 + Math.random() * 300;
  66.     this.dir = Math.random() < 0.6 ? 1 : Math.random() * 10 - 5;
  67.     this.v = 1;
  68.     this.tt = 0;
  69.     if (Math.random() * 0.25) this.v = Math.random() * 5;
  70.   }
  71.  
  72.   draw() { 
  73.     const circ = this.rad * TWO_PI;
  74.     this.rad -= this.v;
  75.  
  76.     this.step = TWO_PI / circ;
  77.  
  78.     if (this.rad > 0) {
  79.       for (let i = 1; i <= this.R; i += this.S) {
  80.         let t = (i * this.step + this.to) * this.dir;
  81.         let x = this.x + this.rad * Math.cos(t);
  82.         let y = this.y + this.rad * Math.sin(t);
  83.         this.dots[this.dotId] = new Dot(this.dotId, x, y, t, this);
  84.         this.dotId++;
  85.       }
  86.     }
  87.     for (let i in this.dots) {
  88.       if (this.dots[i]) this.dots[i].draw();
  89.     }
  90.   }
  91. }
  92.  
  93. onresize = e => {
  94.   canvas.width = innerWidth;
  95.   canvas.height = innerHeight;
  96.   c.fillStyle = "black";
  97.   c.fillRect(0, 0, innerWidth, innerHeight)
  98. }
  99.  
  100. onresize()
  101.  
  102. let ss = [new Stain()];
  103.  
  104. function loop() {
  105.   if (Math.random() < 0.05) {
  106.     ss.push(
  107.       new Stain(Math.random() * innerWidth * 2, Math.random() * innerHeight * 2)
  108.     );
  109.   }
  110.   ss.forEach((s) => s.draw());
  111.   c.globalAlpha = 0.05;
  112.   c.drawImage(canvas, 0, 3, canvas.width + 0.2, canvas.height - 6);
  113.   c.globalAlpha = 1;
  114.   requestAnimationFrame(loop);
  115. }
  116. loop();

Speed coding for some recent youtube shorts…

// animation // canvas // color // curves // graphics // hacks // javascript // math // random // speed-coded // speedcoding // tricks

Golfed Codepen – 3D Spiral Thing

  1. // sort of golfed version of https://www.instagram.com/p/C1uv6Kqv19T/
  2. // by @mewtru
  3. b = document.body
  4. a = Object.assign
  5. a(b.style, { background:'#000', color:'#fff'})
  6. w = 'snippet.zone snippet.zone'.toUpperCase().split``
  7. F = (n, O = 0, C, S, o, t) => { 
  8.   b.innerHTML += `<div id=${n} style='position:absolute;left:50%;top:50%;translate:-50% -50%;width:100% text-align:center;white-space:nowrap'></div>`
  9.   w.map(l => this[n].innerHTML += `<span style='display:inline-block;margin-right:5px;font-size:28px'>${l}</span>`)
  10.   t = O
  11.   setInterval(_ => {
  12.     t += .005
  13.     ;[...this[n].children].map((e, i) => { 
  14.       T = t + i / 2.7
  15.       a(e.style, {
  16.         translate: `0 ${Math.sin(T) * 100}px`,
  17.         scale: Math.cos(T) * .5 + .5})
  18.     }, 16)
  19.   })
  20. }
  21. F('Z') 
  22. F('X', 3)

“Very cool” pen by Lucas Fernando that comes from @mewtru
I decided to do a speed-coded semi-golfed version… can definitely be way more golfed 😀

// 3d // animation // codegolf // css // dom // golfed // hacks // javascript // math // speed-coded // speedcoding // strings

Parametric Equation for Rectangle

  1. // from http://math.stackexchange.com/questions/69099/equation-of-a-rectangle
  2. const rect = (px, py, rx, ry, t) => ({
  3.   x: px + rx + rx * (Math.abs(Math.cos(t)) * Math.cos(t) + Math.abs(Math.sin(t)) * Math.sin(t)),
  4.   y: py + ry + ry * (Math.abs(Math.cos(t)) * Math.cos(t) - Math.abs(Math.sin(t)) * Math.sin(t))
  5. })
  6.  
  7. const SIZE = 200
  8.  
  9. const c = document.body.appendChild(
  10.   Object.assign(document.createElement`canvas`,
  11.     { width: SIZE, height: SIZE }
  12.   )).getContext`2d`
  13.  
  14. c.fillStyle = 'black'
  15. c.fillRect(0, 0, SIZE, SIZE)
  16.  
  17. let t = 0
  18. setInterval(() => {
  19.   const { x, y } = rect(20, 20, 60, 70, t)
  20.   c.fillStyle = 'rgba(255, 0, 0, .1)'
  21.   c.fillRect(x, y, 10, 10)
  22.   t += .05
  23. }, 16)

Wanted to know how to do this for something back in 2015. Great math stackexchange answer here: http://math.stackexchange.com/questions/69099/equation-of-a-rectangle

Could be optimized but leaving as is to match:

x = p(|cos t|cos t + |sin t| sin t)
y = p(|cos t|cos t - |sin t| sin t)

One small change here is to add the width and height to the offset so that it draws from the upper left hand corner instead of the center…

// animation // graphics // javascript // math
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