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AboutAll PostsWarningRandom

Creative Coding Auto-Painting

  1. Object.getOwnPropertyNames(Math).map(i => (this[i] = Math[i]))
  2. ;((
  3.   width = innerWidth * 2,
  4.   height = innerHeight * 2,
  5.   cnv = document.body.appendChild(
  6.     Object.assign(document.createElement('canvas'), {
  7.       width,
  8.       height
  9.     })
  10.   ),
  11.   c = cnv.getContext('2d'),
  12.   r = (n = 1) => Math.random() * n,
  13.   NUM = 50,
  14.   f = () => ({
  15.     ax: r(width),
  16.     ay: r(height),
  17.     x: 0,
  18.     y: 0,
  19.     T: r(9),
  20.     R: r(innerWidth * 0.8) + 40,
  21.     t: r(6),
  22.     C: round(r(255)),
  23.     m: r(5) + 1
  24.   }),
  25.   cs,
  26.   sn,
  27.   dx,
  28.   dy,
  29.   ns = [...Array(NUM)].map(f)
  30. ) => {
  31.   Object.assign(cnv.style, {
  32.     transformOrigin: '0 0',
  33.     transform: 'scale(.5)'
  34.   })
  35.   Object.assign(document.body.style, {
  36.     margin: 0,
  37.     padding: 0
  38.   })
  39.  
  40.   const clear = () => {
  41.     c.fillStyle = '#666668'
  42.     c.fillRect(0, 0, width, height)
  43.     c.globalAlpha = 0.5
  44.   }
  45.  
  46.   onresize = () => {
  47.     width = cnv.width = innerWidth * 2
  48.     height = cnv.height = innerHeight * 2
  49.     clear()
  50.   }
  51.  
  52.   clear()
  53.  
  54.   setInterval(() => {
  55.     for (i = 0; i < 30; i++) {
  56.       ns.map((n, i) => {
  57.         with (n) {
  58.           x = ax + R * cos(t)
  59.           y = ay + R * sin(t) * pow(sin(t * 0.5), m)
  60.           c.fillStyle = `rgba(${C},${C},${C},.02)`
  61.           ;(cs = cos(T)), (sn = sin(T)), (dx = x - ax), (dy = y - ay)
  62.           c.fillRect(cs * dx - sn * dy + ax, sn * dx + cs * dy + ay, 50, 50)
  63.           t += 0.1
  64.           R -= 0.01
  65.           if (R < 5) ns[i] = f()
  66.         }
  67.       })
  68.     }
  69.   }, 16)
  70. })()

Speed coded semi-golfed canvas texture. Best if viewed in fullscreen.

// animation // canvas // codegolf // golfed // graphics // javascript // math // matrix // paths // random

Golfed join

  1. const str = ['one','-','two'].join``;
  2. console.log(str);
  3. // outputs "one-two"

With tagged templates you can pass a template string to a function without parens.

// golfed // javascript // strings // tricks

Print a Tabula Recta (codegolf)

  1. const tabulaRecta = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'
  2.   .replace(/./g,"$&$'$`\n");
  3.  
  4. const pre = document.createElement('pre');
  5. document.body.appendChild(pre);
  6. pre.innerHTML = tabulaRecta;
  7.  
  8. // technique comes from https://codegolf.stackexchange.com/a/87035/63485

This snippet comes from the the codegolf stackexchange. A little while back a challenge for printing a tabula recta popped up along with a very nice answer from user Neil. Take a look at the answer here.

// codegolf // golfed // javascript // strings // tricks

Semi-golfed Calculator

  1. // "Being clever is not clever"
  2. // -- Bjarne Stroustrup
  3. d = document
  4. b = d.body
  5. a = (e = 'div') => b.appendChild(d.createElement(e))
  6. t = a`input`
  7. s = ''
  8. a()
  9. O = v => t.value = v
  10. '0123456789+-*()/C='.split``.map(v => {
  11.   v == '+' && a()
  12.   _ = a`button`
  13.   _.innerHTML = v
  14.   o = { 
  15.     C(){s = O('')},
  16.     ['='](){O(eval(s))}
  17.   }
  18.   _.onclick = () => o[v] ? o[v]() : (s = s + v, O(s))
  19. })
// dom // golfed // javascript // math // tricks

Semi-golfed Canvas Setup

  1. ((
  2.   width = 200, height = 200, 
  3.   cnv = document.body.appendChild(
  4.     Object.assign(
  5.       document.createElement('canvas'), {
  6.       width, height
  7.     })
  8.   ),
  9.   c = cnv.getContext('2d'), 
  10.   f = c.fillRect.bind(c),
  11.   C = _ => c.fillStyle = _) => {
  12.  
  13.   C`gray`; f(0, 0, width, height);
  14.   C`blue`; f(10, 10, 100, 20);
  15. })();
// canvas // golfed // graphics // javascript
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