Snippet Zone

Hermit Crab Curves

// six white geometric figures (outlines) superimposed on a black wall.

```
d = document
```
```
b = d.body
```
```
S = 600
```
```
hs = S / 2
```
```
with(Math) {
```
```
with(
```
```
  b.appendChild(Object.assign(
```

  d.createElement`canvas`, { width: S, height: S })

```
  ).getContext`2d`) {
```
```
 
```
```
    fillRect(0, 0, S, S)
```
```
    strokeStyle = '#fff'
```
```
 
```

    canvas.style.transformOrigin = '0 0'

    canvas.style.transform = 'scale(.5)'

```
 
```
```
    lineWidth = 8
```
```
 
```
```
    H = (
```
```
      s = S * .5,
```
```
      yp = hs, xp = hs,
```
```
      a = 1.234,
```
```
      d = 0.1678,
```
```
      o = 3.9
```
```
      ) => {
```
```
        beginPath()
```
```
        for (t = 0; t < 6.28; t+=.2) {
```

          r = sqrt(a ** PI % sin(d * (t ** 2 * a) + o)) * s

```
          x = xp + r * sin(t);
```
```
          y = yp + r * cos(t);
```

          t === 0 ? moveTo(x, y) : lineTo(x, y)

```
        }
```
```
        closePath()
```
```
        stroke()
```
```
        fill()
```
```
    }
```
```
 
```
```
    tick = 0
```
```
    loop = _ => {
```
```
      fillStyle = 'rgba(0, 0, 0, 0.5)'
```
```
      fillRect(0, 0, S, S)
```
```
      save()
```
```
      translate(S/2, S/2)
```
```
      scale(.5, .5)
```
```
      rotate(tick * 20)
```
```
      translate(-S/2, -S/2)
```
```
      tick += .0001
```
```
      globalAlpha = .8;
```
```
      H(S, hs, hs, 1 + tick)
```
```
      H(S, hs, hs, 1.1 + tick)
```
```
      H(S, hs, hs, 1.2 + tick)
```
```
      globalAlpha = 1;
```
```
      H(S * .3, hs-S/4, hs, 1, tick)
```

      H(S * .2, hs+S/4, hs, 1.2, tick, 1.8)

      H(S * .2, hs, hs - S/4, cos(tick), -tick, 5)

```
      restore()
```
```
      requestAnimationFrame(loop)
```
```
    }
```
```
    loop()
```
```
  }
```
```
}
```

Another thing for #genuary2022… Sol LeWitt Wall Drawing

January 7, 2022

// animation // canvas // graphics // hacks // javascript // math

Gumowski / Mira Thing

```
D = document
```
```
B = D.body
```
```
S = 1200
```
```
with(
```
```
  B.appendChild(Object.assign(
```
```
    D.createElement`canvas`, {
```
```
      width: S,
```
```
      height: S
```
```
    })).getContext`2d`) {
```
```
 
```
```
  canvas.style.transformOrigin = '0 0'
```
```
  canvas.style.transform = 'scale(.5)'
```
```
 
```
```
  b = .9998
```
```
  xn1 = 5
```
```
  yn1 = 0
```
```
  xn = yn = 0
```
```
  scale = 20
```
```
  iterations = 1000
```
```
 
```
```
  f = x => {
```
```
    x2 = x * x
```

    return a * x + (2 * (1 - a) * x2) / (1 + x2)

```
  }
```
```
 
```
```
  mouseX = mouseY = 0
```
```
  onpointermove = e => {
```
```
    mouseX = e.clientX
```
```
    mouseY = e.clientY
```
```
  }
```
```
 
```
```
  dwn = 0
```
```
 
```
```
  fillStyle = '#000'
```
```
  fillRect(0, 0, S, S)
```
```
 
```
```
  loop = _ => {
```
```
 
```
```
    a = mouseY / 1000
```
```
    xn1 = mouseX / 30
```
```
    yn1 = 0
```
```
 
```
```
    dwn += 1
```
```
 
```

    for (var i = 0; i < iterations; i++) {

```
      xn = xn1;
```
```
      yn = yn1;
```
```
 
```

      fillStyle = `hsla(${i / 30}, ${dwn / 6}%, 50%, .2)`

```
 
```
```
      xn1 = b * yn + f(xn)
```
```
      yn1 = -xn + f(xn1)
```

      fillRect(S * .5 + xn1 * scale, yn1 * scale / 2 + dwn, 1, 1)

```
    }
```
```
 
```
```
    requestAnimationFrame(loop)
```
```
  }
```
```
  loop()
```
```
}
```

Move your around as the Gumowski / Mira shape moves down the screen…

January 4, 2022

// animation // canvas // graphics // math // speedcoding

Speed Coded Cosine Dither

```
d = document
```
```
b = d.body
```
```
wh = 300
```
```
hs = wh / 2
```
```
S = 1.5
```
```
with(
```
```
  b.appendChild(Object.assign(
```
```
    d.createElement`canvas`, {
```
```
      width: wh, height: wh
```
```
    })).getContext`2d`) {
```
```
 
```
```
  canvas.style.transformOrigin = '0 0'
```

  canvas.style.transform = `scale(${S})`

  canvas.style.imageRendering = 'pixelated'

```
 
```
```
  fillStyle = 'gray'
```
```
 
```
```
  fillRect(0, 0, wh, wh)
```
```
  shadowBlur = 80
```
```
  shadowColor = 'black';
```
```
  shadowOffsetY = 20
```
```
  for (let i = 0; i < 70; i++) {
```
```
    save()
```
```
    translate(hs, hs)
```
```
    rotate(i / 33)
```
```
    scale(1 - i / 100, 1)
```
```
    translate(-hs, -hs)
```

    fillStyle = `hsl(${i << 2}, 50%, 50%)`

```
    beginPath()
```
```
    arc(hs, hs, hs * .8, 0, 7)
```
```
    fill()
```
```
    restore()
```
```
    shadowColor = 'transparent'
```
```
    shadowBlur = 0
```
```
  }
```
```
 
```

  C = Object.assign(d.createElement`canvas`, {

```
    width: wh, height: wh
```
```
  }).getContext('2d')
```
```
  C.drawImage(canvas, 0, 0);
```
```
 
```
```
  im = getImageData(0, 0, wh, wh);
```
```
 
```
```
  p = im.data
```
```
  size = wh * wh * 4
```
```
 
```
```
  modd = Math.random() * 5550
```
```
  for (let i = 0; i < size; i += 4) {
```

    if (Math.random() < 0.0001) modd = Math.random() * 5550

```
    M = Math.cos(i % modd) * 255
```
```
    p[i] = M < p[i] ? 255 : 0;
```
```
    p[i + 1] = M < p[i + 1] ? 255 : 0;
```
```
    p[i + 2] = M < p[i + 2] ? 255 : 0;
```
```
  }
```
```
 
```
```
  putImageData(im, 0, 0);
```

  globalCompositeOperation = 'hard-light'

```
  drawImage(C.canvas, 0, 0);
```
```
}
```

Some speed-coded canvas stuff with a dither inspired by #genuary2022

January 2, 2022

// canvas // graphics // javascript // random // speedcoding // tricks

WebGL Hemisphere Lines

```
(() => {
```
```
  const m = new Float32Array([
```
```
    0, 0, 0, 0, 
```
```
    0, 0, 0, 0, 
```
```
    0, 0, 0, 0, 
```
```
    0, 0, 0, 0])
```
```
 
```
```
  const pointSize = 4; 
```
```
 
```
```
  const vert = `
```
```
    attribute vec3 vec;
```
```
    uniform mat4 mat;
```
```
    void main(void) {
```

      gl_Position = mat * vec4(vec, 1.0);

```
      gl_PointSize = ${pointSize}.0;
```
```
    }
```
```
  `
```
```
 
```
```
  const frag = `
```
```
    void main(void) {
```

      gl_FragColor = vec4(1., 1., 1., .5);

```
    }
```
```
  `
```
```
 
```

  document.body.style.background = '#232323'

```
  const gl = document.body
```

    .appendChild(document.createElement('canvas'))

```
    .getContext('webgl', {
```
```
      preserveDrawingBuffer: true,
```

      powerPreference: 'high-performance'

```
    })
```
```
 
```
```
  Object.assign(gl.canvas.style, {
```
```
    position: 'absolute',
```
```
    left: '50%',
```
```
    top: '50%',
```
```
    transform: 'translate(-50%, -50%)',
```
```
    outline: '1px solid gray'
```
```
  })
```
```
 
```
```
  with (gl) {
```
```
    const NUM = 2000
```
```
    const radius = 0.7
```
```
    const verts = []
```
```
 
```
```
    for (let i = 0; i < NUM; i += 3) {
```
```
      let xp = Math.random() * 2 - 1
```
```
      let yp = Math.random() * 2 - 1
```
```
      let zp = i / NUM; 
```

      let dist = Math.sqrt(xp * xp + yp * yp + zp * zp)

```
      // normalize and scale x,y,z
```
```
      verts[i] = (xp / dist) * radius
```

      verts[i + 1] = (yp / dist) * radius

      verts[i + 2] = (zp / dist) * radius

```
    }
```
```
    const overts = verts.concat()
```
```
    const leng = verts.length / 3
```
```
 
```

    bindBuffer(ARRAY_BUFFER, createBuffer())

    bufferData(ARRAY_BUFFER, new Float32Array(verts), STATIC_DRAW)

```
 
```

    const vs = createShader(VERTEX_SHADER)

```
    shaderSource(vs, vert)
```
```
    compileShader(vs)
```
```
 
```

    const fs = createShader(FRAGMENT_SHADER)

```
    const sp = createProgram()
```
```
 
```
```
    shaderSource(fs, frag)
```
```
    compileShader(fs)
```
```
    attachShader(sp, vs)
```
```
    attachShader(sp, fs)
```
```
    linkProgram(sp)
```
```
    useProgram(sp)
```
```
 
```

    const vec = getAttribLocation(sp, 'vec')

    vertexAttribPointer(vec, 3, FLOAT, false, 0, 0)

```
    enableVertexAttribArray(vec)
```
```
 
```

    const matLoc = getUniformLocation(sp, 'mat')

```
 
```
```
    function rot(x, y, z) {
```

      // https://wikimedia.org/api/rest_v1/media/math/render/svg/a8e16f4967571b7a572d1a19f3f6468512f9843e

```
 
```
```
      const sinA = Math.sin(x)
```
```
      const cosA = Math.cos(x)
```
```
      const sinB = Math.sin(y)
```
```
      const cosB = Math.cos(y)
```
```
      const sinY = Math.sin(z)
```
```
      const cosY = Math.cos(z)
```
```
 
```
```
      m[0] = cosA * cosB
```

      m[1] = cosA * sinB * sinY - sinA * cosY

      m[2] = cosA * sinB * cosY + sinA * sinY

```
      m[3] = 0
```
```
 
```
```
      m[4] = sinA * cosB
```

      m[5] = sinA * sinB * sinY + cosA * cosY

      m[6] = sinA * sinB * cosY - cosA * sinY

```
      m[7] = 0
```
```
 
```
```
      m[8] = -sinB
```
```
      m[9] = cosB * sinY
```
```
      m[10] = cosB * cosY
```
```
      m[11] = m[12] = m[13] = 0
```
```
      m[15] = 1
```
```
 
```

      uniformMatrix4fv(matLoc, false, m)

```
    }
```
```
 
```
```
    onresize = () => {
```
```
      const { canvas } = gl
```

      const size = Math.min(innerWidth, innerHeight) - 20

      canvas.width = canvas.height = size

```
      viewport(0, 0, size, size)
```
```
    }
```
```
 
```
```
    onresize()
```
```
 
```
```
    let rx = 0
```
```
    let ry = 0
```
```
    let rz = 0
```
```
    let t = 0
```
```
 
```
```
    function loop() {
```
```
      rx += 0.005
```
```
      ry += 0.005
```
```
      rot(rx, ry, rz)
```
```
 
```
```
      disable(DEPTH_TEST)
```
```
      enable(BLEND)
```

      blendFunc(SRC_ALPHA, ONE_MINUS_SRC_ALPHA)

```
 
```
```
      clearColor(0, 0, 0, 1)
```
```
 
```
```
      clear(COLOR_BUFFER_BIT)
```
```
 
```

      for (let i = 0; i < verts.length; i += 3) {

```
        let tof = i * 0.001 + t;
```

        verts[i] = Math.sin(tof) * overts[i]

        verts[i + 1] = Math.sin(tof) * overts[i + 1]

        verts[i + 2] = Math.sin(tof) * overts[i + 2]

```
      }
```
```
 
```
```
      t += 0.005
```
```
 
```

      bufferSubData(ARRAY_BUFFER, 0, new Float32Array(verts))

```
 
```
```
      drawArrays(LINES, 0, leng)
```
```
      drawArrays(POINTS, 0, leng)
```

      window.requestAnimationFrame(loop)

```
    }
```
```
    loop()
```
```
  }
```
```
})()
```

WebGL lines and points…

January 1, 2022

// animation // canvas // graphics // javascript // speedcoding // webgl

Speed Coded Mouse Toy

```
d = document
```
```
b = d.body
```
```
b.style.margin = 0
```
```
with (b.appendChild(
```

  Object.assign(d.createElement`canvas`, {

```
    width: innerWidth,
```
```
    height: innerHeight,
```
```
  })
```
```
).getContext`2d`) {
```
```
  mx = 0
```
```
  my = 0
```
```
 
```
```
  onresize = _ => {
```
```
    canvas.width = innerWidth
```
```
    canvas.height = innerHeight
```
```
  }
```
```
 
```
```
  onpointermove = e => {
```
```
    mx = e.clientX, 
```
```
    my = e.clientY
```
```
  }
```
```
 
```
```
  r = 0
```
```
  loop = () => {
```
```
    save()
```

    globalCompositeOperation = 'hard-light'

    translate(innerWidth / 2, innerHeight / 2)

```
 
```
```
    rotate(r += .02)
```

    translate(-innerWidth / 2, -innerHeight / 2)

```
 
```
```
    fillStyle = 'rgba(55, 55, 55, .01)'
```

    fillRect(0, 0, innerWidth, innerHeight)

```
 
```

    fillStyle = 'rgba(116, 196, 221, .02)'

```
    fillRect(0, my, innerWidth, 20);
```
```
 
```

    fillStyle = 'rgba(255, 255, 255, .02)'

```
    fillRect(mx, 0, 20, innerHeight);
```
```
 
```
```
    fillStyle = 'rgba(0, 0, 0, .03)'
```

    fillRect(0, innerHeight - my, innerWidth, 20);

```
 
```

    fillStyle = 'rgba(116, 196, 221, .02)'

    fillRect(innerWidth - mx, 0, 20, innerHeight);

```
    restore()
```
```
    requestAnimationFrame(loop)
```
```
  }
```
```
  loop()
```
```
}
```

Speed coded mouse toy…

December 30, 2021

// canvas // codegolf // globals // graphics // hacks // speedcoding

Older Posts

Newer Posts

Hermit Crab Curves

Gumowski / Mira Thing

Speed Coded Cosine Dither

WebGL Hemisphere Lines

Speed Coded Mouse Toy

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