Snippet Zone

Wiggly Line Canvas

const canvas = document.body.appendChild(

```
  document.createElement('canvas')
```
```
);
```
```
const c = canvas.getContext('2d');
```
```
document.body.style.margin = 0;
```
```
 
```
```
function resize() {
```
```
  canvas.width = innerWidth;
```
```
  canvas.height = innerHeight;
```
```
}
```
```
addEventListener('resize', resize);
```
```
resize();
```
```
 
```
```
const PAD = 50;
```
```
const RAD = 2;
```
```
const SPEED = 20;
```
```
const TWO_PI = Math.PI * 2;
```
```
 
```
```
let mode = 'draw';
```
```
 
```
```
let t = Math.random() * TWO_PI, 
```
```
    x = innerWidth / 2, 
```
```
    y = innerHeight / 2,
```
```
    vx = 0, vy = 0, ta = 0;
```
```
 
```
```
function loop() {
```
```
  for (var i = 0; i < SPEED; i++) {
```
```
    t = Math.sin(ta) * TWO_PI;
```
```
    vx = RAD * Math.cos(t);
```
```
    vy = RAD * Math.sin(t);
```
```
    ta += Math.random() * 0.1 - 0.05;
```
```
    x += vx;
```
```
    y += vy;
```
```
 
```
```
    if (Math.random() < 0.005) {
```
```
      mode = 'no draw';
```
```
    } else if (Math.random() < 0.005) {
```
```
      mode = 'draw';
```
```
    }
```
```
 
```
```
    if (mode === 'draw') {
```
```
      c.fillStyle = 'red';
```
```
      c.fillRect(x, y, 2, 2);
```
```
    }
```
```
 
```
```
    if (x < -PAD) {
```
```
      x = innerWidth + PAD;
```
```
    } else if (x > innerWidth + PAD) {
```
```
      x = -PAD;
```
```
    }
```
```
    if (y < -PAD) {
```
```
      y = innerHeight + PAD;
```
```
    } else if (y > innerHeight + PAD) {
```
```
      y = -PAD;
```
```
    }
```
```
  }
```
```
 
```
```
  requestAnimationFrame(loop);
```
```
}
```
```
loop();
```

Recently saw this in some very old code – cool trick for moving things in a wiggly way – or in this case, drawing a wiggly line.

September 19, 2021

// animation // canvas // javascript // math // random // tricks

Creative Coding Auto-Painting

Object.getOwnPropertyNames(Math).map(i => (this[i] = Math[i]))

```
;((
```
```
  width = innerWidth * 2,
```
```
  height = innerHeight * 2,
```
```
  cnv = document.body.appendChild(
```

    Object.assign(document.createElement('canvas'), {

```
      width,
```
```
      height
```
```
    })
```
```
  ),
```
```
  c = cnv.getContext('2d'),
```
```
  r = (n = 1) => Math.random() * n,
```
```
  NUM = 50,
```
```
  f = () => ({
```
```
    ax: r(width),
```
```
    ay: r(height),
```
```
    x: 0,
```
```
    y: 0,
```
```
    T: r(9),
```
```
    R: r(innerWidth * 0.8) + 40,
```
```
    t: r(6),
```
```
    C: round(r(255)),
```
```
    m: r(5) + 1
```
```
  }),
```
```
  cs,
```
```
  sn,
```
```
  dx,
```
```
  dy,
```
```
  ns = [...Array(NUM)].map(f)
```
```
) => {
```
```
  Object.assign(cnv.style, {
```
```
    transformOrigin: '0 0',
```
```
    transform: 'scale(.5)'
```
```
  })
```
```
  Object.assign(document.body.style, {
```
```
    margin: 0,
```
```
    padding: 0
```
```
  })
```
```
 
```
```
  const clear = () => {
```
```
    c.fillStyle = '#666668'
```
```
    c.fillRect(0, 0, width, height)
```
```
    c.globalAlpha = 0.5
```
```
  }
```
```
 
```
```
  onresize = () => {
```
```
    width = cnv.width = innerWidth * 2
```

    height = cnv.height = innerHeight * 2

```
    clear()
```
```
  }
```
```
 
```
```
  clear()
```
```
 
```
```
  setInterval(() => {
```
```
    for (i = 0; i < 30; i++) {
```
```
      ns.map((n, i) => {
```
```
        with (n) {
```
```
          x = ax + R * cos(t)
```

          y = ay + R * sin(t) * pow(sin(t * 0.5), m)

          c.fillStyle = `rgba(${C},${C},${C},.02)`

          ;(cs = cos(T)), (sn = sin(T)), (dx = x - ax), (dy = y - ay)

          c.fillRect(cs * dx - sn * dy + ax, sn * dx + cs * dy + ay, 50, 50)

```
          t += 0.1
```
```
          R -= 0.01
```
```
          if (R < 5) ns[i] = f()
```
```
        }
```
```
      })
```
```
    }
```
```
  }, 16)
```
```
})()
```

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

August 27, 2021

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

Wobbling Ball With Canvas

// same as yesterday but with canvas instead of svg

const canvas = document.createElement('canvas'),

```
      c = canvas.getContext('2d');
```
```
document.body.appendChild(canvas);
```
```
document.body.style.margin = 0;
```
```
 
```
```
let w = window.innerWidth,
```
```
    h = window.innerHeight,
```
```
    x = w / 2,
```
```
    y = h / 2,
```
```
    vx = vy = dx = dy = 0,
```
```
    damp = 0.99, div = 8, ticks = 0, 
```
```
    wobbleChance = 0.03,
```
```
    startTick = 50;
```
```
 
```
```
function loop() {
```
```
 
```
```
  w = window.innerWidth;
```
```
  h = window.innerHeight;
```
```
  radius = w * 0.05;
```
```
  diam = radius * 2;
```
```
  diam2x = diam * 2;
```
```
 
```
```
  if (x > w){
```
```
    vx *= -1;
```
```
    dx *= -1;
```
```
    x = w;
```
```
  } else if (x < 0){
```
```
    vx *= -1;
```
```
    dx *= -1;
```
```
    x = 0;
```
```
  }
```
```
 
```
```
  if (y > h) {
```
```
    vy *= -1;
```
```
    dy *= -1;
```
```
    y = h;
```
```
  } else if (y < 0) {
```
```
    vy *= -1;
```
```
    dy *= -1;
```
```
    y = 0
```
```
  } 
```
```
 
```
```
  if (
```
```
    Math.random() < wobbleChance || 
```
```
    ticks === startTick) {
```
```
      dx += Math.random() * 10 - 5;
```
```
      dy += Math.random() * 10 - 5;
```
```
  }
```
```
 
```
```
  dx *= damp;
```
```
  dy *= damp;
```
```
 
```
```
  vx += (dx - vx) / div;
```
```
  vy += (dy - vy) / div;
```
```
 
```
```
  x += vx;
```
```
  y += vy;
```
```
 
```
```
  // in most cases these days you
```

  // just clear the whole canvas, but for

  // this example we clear a rectangle around

```
  // the circle 
```
```
  c.clearRect(
```
```
    x - diam, 
```
```
    y - diam, 
```
```
    diam2x, 
```
```
    diam2x
```
```
  );
```
```
 
```
```
  // draw the path
```
```
  c.fillStyle = 'red'
```
```
  c.beginPath();
```

  c.arc(x, y, radius, 0, Math.PI * 2, false);

```
  c.fill();
```
```
 
```
```
  ticks++;
```
```
  window.requestAnimationFrame(loop);
```
```
}
```
```
loop();
```
```
 
```
```
function resize() {
```
```
  canvas.width = window.innerWidth;
```
```
  canvas.height = window.innerHeight;
```
```
}
```
```
resize();
```

window.addEventListener('resize', resize);

A wobbling ball with canvas.

August 8, 2021

// animation // canvas // graphics // javascript // random

Wobbling Ball with SVG

```
const el = document.body.appendChild(
```
```
  document.createElement('div'));
```
```
 
```
```
el.innerHTML = `
```
```
  <svg width="100%" height="100%">
```
```
    <circle 
```
```
     id="circ" 
```
```
     cx="0" cy="0" r="50"
```

     fill="red" style="will-change: transform;"/>

```
  </svg>
```
```
  <style>
```
```
    svg, div, body, html {
```
```
      overflow: visible; 
```
```
      height: 100%; 
```
```
      width: 100%;
```
```
      margin: 0; padding: 0;
```
```
    }
```
```
  </style>
```
```
  `;
```
```
 
```
```
let w = window.innerWidth,
```
```
    h = window.innerHeight,
```
```
    x = w / 2,
```
```
    y = h / 2,
```
```
    vx = vy = dx = dy = 0,
```
```
    damp = 0.99, div = 8, ticks = 0, 
```
```
    wobbleChance = 0.03,
```
```
    startTick = 50;
```
```
 
```
```
function loop() {
```
```
  w = window.innerWidth;
```
```
  h = window.innerHeight;
```
```
 
```
```
  if (x > w){
```
```
    vx *= -1;
```
```
    dx *= -1;
```
```
    x = w;
```
```
  } else if (x < 0){
```
```
    vx *= -1;
```
```
    dx *= -1;
```
```
    x = 0;
```
```
  }
```
```
 
```
```
  if (y > h) {
```
```
    vy *= -1;
```
```
    dy *= -1;
```
```
    y = h;
```
```
  } else if (y < 0) {
```
```
    vy *= -1;
```
```
    dy *= -1;
```
```
    y = 0
```
```
  } 
```
```
 
```
```
  if (
```
```
    Math.random() < wobbleChance || 
```
```
    ticks === startTick) {
```
```
      dx += Math.random() * 10 - 5;
```
```
      dy += Math.random() * 10 - 5;
```
```
  }
```
```
 
```
```
  dx *= damp;
```
```
  dy *= damp;
```
```
 
```
```
  vx += (dx - vx) / div;
```
```
  vy += (dy - vy) / div;
```
```
 
```
```
  x += vx;
```
```
  y += vy;
```
```
 
```

  circ.setAttribute('transform', `translate(${x} ${y})`);

```
 
```
```
  ticks++;
```
```
  window.requestAnimationFrame(loop);
```
```
}
```
```
loop();
```
```
 
```
```
function resize() {
```
```
  const radius = Math.min(w, h) * .05;
```
```
 
```

  // `window.circ` is the global id (⌐■_■)

```
  circ.r.baseVal.value = radius;
```
```
}
```
```
resize();
```

window.addEventListener('resize', resize);

A wobbling ball with svg.

August 7, 2021

// animation // graphics // javascript // math // random // svg

Quick SVG

```
const el = document.body.appendChild(
```
```
    document.createElement('div'));
```

el.innerHTML = `<svg style='overlow:visible'>

  <circle cx="100" cy="20" r="20" fill="red" />

  <rect x="100" y="60" width="20" height="20" fill="blue" />

```
</svg>`;
```

Defining SVG like this in a template string is a fast and powerful way to start doing SVG that is controlled or generated by JavaScript. Here is another example:

const scribble = document.body.appendChild(

```
    document.createElement('div'));
```
```
const d = (iter = 30) => {
```
```
  // make sure the iter is odd
```
```
  if (iter % 2 == 0) iter += 1;
```
```
  // random cubic beziér
```
```
  let path = 'M ';
```
```
  for (let i = 0; i < iter; i++) {
```
```
    const cmd = i == 1 ? 'C ' : ' '
```

    path += cmd + Math.random() * 200 + ' ' + Math.random() * 200;

```
  }
```
```
  return path + 'z';
```
```
}
```

scribble.innerHTML = `<svg style='overlow:visible' viewBox="0 0 200 200">

```
  <path d="${d()}" 
```
```
    stroke="#295896" 
```
```
    stroke-width="3"
```
```
    fill="#ccc" 
```
```
    fill-rule="even-odd"
```

    vector-effect="non-scaling-stroke" />

```
</svg>
```
```
<style>
```
```
  svg, div, body, html {
```
```
    overflow: visible; 
```
```
    height: 100%; 
```
```
    width: 100%;
```
```
    margin: 0; padding: 0;
```
```
  }
```
```
</style>
```
```
`;
```

You’ll notice a somewhat hacky style tag as well… this is used to quickly fill the page with the SVG.

August 5, 2021

// graphics // javascript // paths // random // svg // tricks

Newer Posts

Wiggly Line Canvas

Creative Coding Auto-Painting

Wobbling Ball With Canvas

Wobbling Ball with SVG

Quick SVG

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