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AboutAll PostsWarningRandom

Bad PI Approximation

  1. let inside = 0;
  2. let precision = 1e6;
  3. for (let i = 0; i < precision; i++){
  4.   const xp = 0.5 - Math.random();
  5.   const yp = 0.5 - Math.random();
  6.   if (Math.sqrt(xp * xp + yp * yp) < 0.5) {
  7.     inside++;
  8.   }
  9. }
  10. console.log(inside / precision * 4);

This is a funny one, someone described this to me once and I coded it up over on actionsnippet.

// hacks // javascript // math // tricks

Gray Gradient Texture

  1. function rect(x1, y1, x2, y2, col, blur = 0.1) {
  2.   const dx = x1 - x2;
  3.   const dy = y1 - y2;
  4.   const dist = Math.sqrt(dx * dx + dy * dy);
  5.   return `radial-gradient(circle at ${x1}% ${y1}%, ${col} 0, ${col} ${dist}%, transparent ${dist +
  6.     blur}%)`;
  7. }
  8. const blends = 'multiply,screen,overlay,darken,lighten,color-dodge,color-burn,hard-light,soft-light,difference,exclusion,hue'.split(
  9.   ','
  10. );
  11. const cols = ['black', 'white'];
  12.  
  13. function gen() {
  14.   [...document.querySelectorAll('div')].forEach(d =>
  15.     d.parentNode.removeChild(d)
  16.   );
  17.   for (let j = 0; j < 4; j++) {
  18.     const rects = [];
  19.     for (let i = 0; i < 10; i++) {
  20.       const x = Math.random() * 100;
  21.       const y = Math.random() * 100;
  22.       const s = Math.random() * Math.random() * Math.random() * 30 + 3;
  23.       const col = cols[~~(Math.random() * cols.length)];
  24.       rects.push(rect(x, y, x + s, y + s, col, Math.random() * 10));
  25.     }
  26.     const el = document.body.appendChild(document.createElement('div'));
  27.     el.style.backgroundImage = rects.join(', ');
  28.     el.style.mixBlendMode = blends[~~(Math.random() * blends.length)];
  29.   }
  30. }
  31. gen();
  32.  
  33. document.body.innerHTML += `
  34.   <button id="regen">Regenerate</button>
  35.   <style>
  36.     body, html {
  37.       height: 100%;
  38.       background: #ccc;
  39.       margin: 0;
  40.       background-repeat: no-repeat;
  41.       width: 100%;
  42.     }
  43.     div {
  44.       position: absolute;
  45.       top: 0; left: 0;
  46.       width: 100%;
  47.       height: 100%;
  48.     }
  49.     #regen {
  50.       position: absolute;
  51.       width: 100px;
  52.       height: 30px;
  53.       background: #ccc;
  54.       border: 1px solid white;
  55.       margin: 1em;
  56.       cursor: pointer;
  57.       transition: all 250ms ease-out;
  58.       z-index: 999;
  59.     }
  60.     #regen:hover { background: #333; color: white; }
  61.   </style>
  62. `;
  63.  
  64. regen.onclick = gen;

Playing around some more with lots of linear gradients.

// color // css // gradients // graphics // hacks // javascript // speed-coded

Conic Accident

  1. conicBtn.onclick = () => {
  2.   document.body.innerHTML += `
  3.   <style>
  4.     div {
  5.       background: conic-gradient(red, yellow, lime, aqua, blue, magenta, red);
  6.     }
  7.   </style>
  8.   `
  9. }

get ready….



When I created the gradient conic snippet from a few days ago – I accidentally applied the rule to the entire page…. thought it was funny enough to be worth making a snippet out of 😀

// css // gradients // graphics // hacks // javascript

Responsive Radial Gradient Animation

  1. function rect(x1, y1, x2, y2, col, blur=.1) {
  2.   const dx = x1 - x2;
  3.   const dy = y1 - y2;
  4.   const dist = Math.sqrt(dx * dx + dy * dy);
  5.   return `radial-gradient(circle at ${x1}% ${y1}%, ${col} 0, ${col} ${dist}%, transparent ${dist +
  6.     blur}%)`;
  7. }
  8.  
  9. const NUM = 8; 
  10.  
  11. let rects = [];
  12. const colors = ['rgba(0, 0, 0, 0.2)', 'white', 'black'];
  13.  
  14. let x = 0;
  15. let y = 0;
  16. let t = 8;
  17. function loop() { 
  18.   rects = [];
  19.  
  20.   for (let i = 0; i < NUM; i++) { 
  21.     x = 50 + 30 * Math.sin(t + i / 2);
  22.     y = 50 + 30 * Math.cos(t * 1.5 * i / 10);
  23.     rects.push(rect(x, y, x + 5, y + 5, 'rgba(255, 255, 255, 1)', 1));
  24.     rects.push(rect(x, y, x + 5, y + 5, 'rgba(0, 0, 0, 0.4)', 
  25.       8 + 6 * Math.cos(y / 10)));
  26.   }
  27.   t += .04;
  28.   document.body.style.backgroundImage = rects.join(', ');
  29.   window.requestAnimationFrame(loop);
  30. }
  31. loop()
  32.  
  33. document.body.innerHTML += `
  34.   <style>
  35.     body, html {
  36.       height: 100%;
  37.       background: #ccc;
  38.       margin: 0;
  39.       background-repeat: no-repeat;
  40.       width: 100%;
  41.     }
  42.   </style>
  43. `;

Animated variation on yesterdays post – many animating circles with no divs or canvas, just radial-gradients…

// animation // css // dom // graphics // hacks // javascript // math

Responsive Radial Gradient Background

  1. function rect(x1, y1, x2, y2, col) {
  2.   const dx = x1 - x2;
  3.   const dy = y1 - y2;
  4.   const dist = Math.sqrt(dx * dx + dy * dy);
  5.   return `radial-gradient(circle at ${x1}% ${y1}%, ${col} 0, ${col} ${dist}%, transparent ${dist +
  6.     0.1}%)`;
  7. }
  8.  
  9. const NUM = 90;
  10. const MAX_SIZE = 20;
  11.  
  12. const rects = [];
  13. const colors = ['rgba(0, 0, 0, 0.2)', 'white', 'black'];
  14.  
  15. for (let i = 0; i < NUM; i++) {
  16.   const x1 = Math.random() * 100; // %
  17.   const y1 = Math.random() * 100;
  18.   const size = Math.random() * Math.random() * MAX_SIZE;
  19.   const idx = Math.random() < 0.3 ? 1 + Math.round(Math.random()) : 0;
  20.   col = colors[idx];
  21.   rects.push(rect(x1, y1, x1 + size,  y1 + size, col));
  22. }
  23.  
  24. document.body.style.backgroundImage = rects.join(', ');
  25.  
  26. document.body.innerHTML += `
  27.   <style>
  28.     body, html {
  29.       height: 100%;
  30.       background-repeat: no-repeat;
  31.     }
  32.   </style>
  33. `;

Many circles with no divs or canvas, just radial-gradients…

// css // dom // gradients // graphics // hacks // javascript
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