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HTML

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CSS

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CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

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JavaScript

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Babel includes JSX processing.

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HTML 

              
                <input type="range" min="1" max="9" step="1" id="step" value="1">
<section>
  <p>Divide your canvas into a grid of squares</p>
  <p>For every square, get a noise value from its coordinates</p>
  <p>Use that noise value to define the brightness of the square</p>
  <p>Draw a line in the center of every square</p>
  <p>Hide the squares and rotate the lines based on the noise value</p>
  <p>Fade out each line from its angle</p>
  <p>Reduce the scale of your grid</p>
  <p>Update the noise values from the frame count to animate your scene</p>
  <p>Be creative</p>
</section>
!

CSS 

              
                body {
  margin: 0;
  overflow: hidden;
  display: flex;
  height: 100vh;
  background: black;
}
canvas {
  margin: auto;
  touch-action: none;
}

@mixin track {
  box-sizing: border-box;
  height: 6px;
	background: #fff;
  -webkit-appearance: none;
  appearance: none;
}

@mixin thumb {
  box-sizing: border-box;
	width: 30px;
  height: 30px;
	border-radius: 50%;
	background: #fff;
  border: 2px solid black;
  -webkit-appearance: none;
  appearance: none;
  cursor: grab;
}

input {
  position: fixed;
  left: 50%;
  bottom: 20px;
  transform: translateX(-50%);
  width: 80%;
  height: 34px;
  max-width: 400px;
  background: transparent;
  -webkit-appearance: none;
  appearance: none;
  &:active {
    cursor: grabbing;
  }
  &::-webkit-slider-runnable-track {@include track }
	&::-moz-range-track { @include track }
	&::-ms-track { @include track }
  
  &::-webkit-slider-thumb {margin-top: -12px;@include thumb}
	&::-moz-range-thumb { @include thumb }
  &::-ms-thumb {margin-top:0px;@include thumb}
}

section {
  box-sizing: border-box;
  font-size: 30px;
  color: white;
  position: fixed;
  left: 0;
  top: 20px;
  width: 100%;
  text-align: center;
  padding: 10px 10%;
  z-index: 10;
  pointer-events: none;
  text-shadow: 0 0 3px black, 0 0 4px black, 0 0 5px black;
  background: rgba(0, 0, 0, 0.7);
  p {
    margin: 0;
  }
  @media (max-width: 500px) {
    font-size: 24px;
  }
}
!

JS 

              
                // Overwrite P5 native noise function with an external one
const _noise = noise;

let detail = 20;
let lineLength = 30;
let ctx;
let lines = [];

/* ====== STEP 1 ====== */
function step1 () {
  clear();
  noLoop();
  fill(0);
  stroke(150);
  detail = 42;
  for (let y = 0; y < height; y+=detail) {
    for (let x = 0; x < width; x+=detail) {
      rect(x + 0.5, y + 0.5, detail, detail);
    }
  }
}

/* ====== STEP 2 ====== */
function step2 () {
  clear();
  noLoop();
  stroke(150);
  textAlign(CENTER, CENTER);
  textSize(12);
  textFont('Courier New')
  detail = 42;
  for (let y = 0; y < height; y+=detail) {
    for (let x = 0; x < width; x+=detail) {
      fill(0);
      rect(x + 0.5, y + 0.5, detail, detail);
      const noiseValue = _noise.simplex2(x * 0.002, y * 0.002);
      fill(255);
      text(round(noiseValue * 100) / 100, x + (detail / 2), y + (detail / 2));
    }
  }
}

/* ====== STEP 3 ====== */
function step3 () {
  clear();
  noLoop();
  fill(0);
  stroke(150);
  detail = 42;
  for (let y = 0; y < height; y+=detail) {
    for (let x = 0; x < width; x+=detail) {
      const noiseValue = _noise.simplex2(x * 0.002, y * 0.002);
      fill(map(noiseValue, -1, 1, 0, 255));
      rect(x + 0.5, y + 0.5, detail, detail);
    }
  }
}

/* ====== STEP 4 ====== */
function step4 () {
  clear();
  noLoop();
  fill(0);
  detail = 42;
  for (let y = 0; y < height; y+=detail) {
    for (let x = 0; x < width; x+=detail) {
      const noiseValue = _noise.simplex2(x * 0.002, y * 0.002);
      fill(map(noiseValue, -1, 1, 0, 255));
      translate(x, y);
      stroke(150);
      rect(0.5, 0.5, detail, detail);
      translate(detail / 2, detail / 2);
      stroke(255);
      line(-lineLength * 0.5, 0, lineLength * 0.5, 0);
      resetMatrix();
    }
  }
}

/* ====== STEP 5 ====== */
function step5 () {
  clear();
  noLoop();
  stroke(255);
  detail = 42;
  for (let y = 0; y < height; y+=detail) {
    for (let x = 0; x < width; x+=detail) {
      const noiseValue = _noise.simplex2(x * 0.002, y * 0.002);
      translate(x + detail / 2, y + detail / 2);
      rotate(map(noiseValue, -1, 1, 0, TWO_PI));
      line(-lineLength * 0.5, 0, lineLength * 0.5, 0);
      resetMatrix();
    }
  }
}

/* ====== STEP 6 ====== */
function step6 () {
  clear();
  noLoop();
  stroke(255);
  detail = 42;
  for (let y = 0; y < height; y+=detail) {
    for (let x = 0; x < width; x+=detail) {
      const noiseValue = _noise.simplex2(x * 0.002, y * 0.002);
      translate(x + detail / 2, y + detail / 2);
      rotate(map(noiseValue, -1, 1, 0, TWO_PI));
      stroke(map(noiseValue, -1, 1, 0, 255));
      line(-lineLength * 0.5, 0, lineLength * 0.5, 0);
      resetMatrix();
    }
  }
}

/* ====== STEP 7 ====== */
function step7 () {
  noLoop();
  clear();
  detail = 20;
  ctx.globalAlpha = 1;
  for (let y = 0; y < height; y+=detail) {
    for (let x = 0; x < width; x+=detail) {
      const noiseValue = _noise.simplex2(x * 0.002, y * 0.002);
      translate(x + detail / 2, y + detail / 2);
      rotate(map(noiseValue, -1, 1, 0, TWO_PI));
      stroke(map(noiseValue, -1, 1, 0, 255));
      line(-lineLength * 0.5, 0, lineLength * 0.5, 0);
      resetMatrix();
    }
  }
}

/* ====== STEP 8 ====== */
function goToStep8 () {
  loop();
  stroke(255);
  detail = 24;
  lineLength = 36;
  lines = [];
  strokeWeight(2);
  blendMode(BLEND);
  ctx.strokeStyle = 'white';
  
  for (let y = 0; y < height; y += detail) {
    for (let x = 0; x < width; x += detail) {
      lines.push(new Line(x, y));
    }
  }
}

function step8 () {
  clear();
  lines.forEach(l => l.draw());
}

/* ====== STEP 9 ====== */
function goToStep9 () {
  loop();
  stroke(255);
  detail = 24;
  lineLength = 120;
  lines = [];
  ctx.globalAlpha = 1;
  strokeWeight(4);
  blendMode(SCREEN);
  
  for (let y = 0; y < height; y += detail) {
    for (let x = 0; x < width; x += detail) {
      lines.push(new Line(x, y, true));
    }
  }
}

function step9 () {
  clear();
  lines.forEach(l => l.draw(true));
}

class Line {
  constructor (x, y, crazy) {
    this.x = x;
    this.y = y;
    this._x = this.x * 0.002;
    this._y = this.y * 0.002;
  }
  draw (crazy) {
    const noiseValue = _noise.simplex3(this._x, this._y, frameCount * 0.008);
    ctx.translate(this.x + detail / 2, this.y + detail / 2);
    ctx.rotate(map(noiseValue, -1, 1, 0, TWO_PI));
    if (crazy) {
      ctx.strokeStyle = `hsl(${map(noiseValue, -1, 1, 0, 360)}, 70%, 50%)`;
    } else{
      ctx.globalAlpha = map(noiseValue, -1, 1, 0, 1);
    }
    line(-lineLength * 0.5, 0, lineLength * 0.5, 0);
    ctx.setTransform(1, 0, 0, 1, 0, 0);
  }
}

function setup () {
  const canvas = createCanvas(windowWidth, windowHeight);
  ctx = canvas.canvas.getContext('2d');
  
  pixelDensity(1);
  strokeWeight(2);
  
  windowResized();
  document.querySelector('#step').addEventListener('input', () => {
    if (window['goToStep' + step.value]) {
      window['goToStep' + step.value]();
    }
    draw();
  });
}

function windowResized () {
  resizeCanvas(windowWidth, windowHeight);
  
  noiseSeed(random(100));
  if (window['goToStep' + step.value]) {
    window['goToStep' + step.value]();
  }
  draw();
}

const texts = document.querySelectorAll('section p');
function draw () {
  window['step' + step.value]();
  
  texts.forEach(text => text.style.display = 'none');
  texts[step.value - 1].style.display = 'block';
}
!
999px

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