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CSS

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HTML 

              
                <div id="instructions">
  Press SPACEBAR / TAP screen to randomize
</div>
!

CSS 

              
                html, body {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
  font-family: Helvetica, Calibri, Roboto, Open Sans, sans-serif;
  -webkit-backface-visibility: hidden;
  background: black;
  color: #999;
}

canvas {
  position: fixed;
  z-index: 1;
}

.dg.ac {
  z-index: 3 !important;
}

#instructions {
  position: fixed;
  z-index: 2;
  bottom : 10px;
  left : 50%;
  transform : translateX(-50%);
  background : rgba(0,0,0,0.6);
  padding : 3px 10px;
  font-family: helvetica neue, arial, sans-serif;
  font-size: 16px;
  font-weight: 300;
  letter-spacing: 2px;
  color : #fff;
}
!

JS 

              
                const colors = [
  '#a7fcc7',
  '#90d0fb',
  '#6970f9',
  '#cb73f9',
  '#d977f9',
  
  '#75fba7',
  '#52b5f9',
  '#1420f5',
  '#ad24f6',
  '#c42af6',

  '#4ba16b',
  '#34749f',
  '#0c149d',
  '#6e179d',
  '#7d1b9d',

  '#e03b51',
  '#ffffff',
  '#00ffff',
  '#ff00f4',
];

const colorsBright = [
  '#a7fcc7',
  '#90d0fb',
  '#6970f9',
  '#cb73f9',
  '#d977f9',
];

const colorsDark = [
  '#4ba16b',
  '#34749f',
  '#0c149d',
  '#6e179d',
  '#7d1b9d',
];

const vars = getRandomVars();
console.log('GRID SPACING:', vars.gridSpacing);

var canvas = document.createElement('canvas');
document.body.append(canvas);
var ctx = canvas.getContext('2d');
var W = canvas.width = window.innerWidth;
var H = canvas.height = window.innerHeight;

// var x = Math.floor(Math.random() * W);
// var y = Math.floor(Math.random() * H);

const raf = window.requestAnimationFrame;

let polys = [];

let numRows = H / (vars.gridSpacing);
let numCols = W / (vars.gridSpacing);

console.log('numRows:', numRows);

let rowIndex = 0;
let colIndex = 0;

window.addEventListener('resize', handleResize);
document.body.onkeyup = function(e) {
  if (e.keyCode === 32) {
    randomizeVars();
  }
};
canvas.addEventListener('click', randomizeVars);

function handleResize() {
  W = canvas.width = window.innerWidth;
  H = canvas.height = window.innerHeight;

  numRows = H / (vars.gridSpacing);
  numCols = W / (vars.gridSpacing);
  
  createPolys();
}

function getRandomVars() {
  return {
    sides: 3 + Math.floor(Math.random() * 3),
    speed: Math.random() * 0.08,
    speedIncrement: 0.011, // 0.001 - (Math.random() * (0.001 * 2)),
    radius: 10 + (Math.random() * 50),
    gridSpacing:  20 + (Math.random() * 20),
    lineWidth: 0.5 + Math.random() * 3,
    color1: colorsBright[Math.floor(Math.random() * colorsBright.length)],
    color2: colorsDark[Math.floor(Math.random() * colorsDark.length)],
    animateColor1: true,
    animateColor2: true,
    rotationOffsetRow: 20,
    flipOffsetRow: Math.random() < 0.5,
    rotationOffsetCol: 30,
    flipOffsetCol: Math.random() < 0.5,
    scaleFactorMin: Math.random() * 0.25,
    scaleStartAngle: Math.random() < 0.5,
  }
};

function randomizeVars() {
  window.cancelAnimationFrame(color1Raf);
  window.cancelAnimationFrame(color2Raf);
  
  const newVars = getRandomVars();

  vars.sides = newVars.sides;
  vars.speed = newVars.speed;
  vars.speedIncrement = newVars.speedIncrement;
  // vars.minRadius = newVars.minRadius;
  // vars.maxRadius = radiusIncrement = newVars.maxRadius;
  vars.glowColor = newVars.glowColor;
  vars.animateGlowColor = newVars.animateGlowColor;
  vars.glowSize = newVars.glowSize;
  vars.strokeColor = newVars.strokeColor;
  vars.animateStrokeColor = newVars.animateStrokeColor;
  vars.lineWidth = newVars.lineWidth;
  vars.text = newVars.text;
  vars.textPadding = newVars.textPadding;
  vars.textAlign = newVars.textAlign;
  vars.textBgColor = newVars.textBgColor;
  vars.fontColor = newVars.fontColor;
  vars.fontSize = newVars.fontSize;
  
  vars.color1 = newVars.color1;
  vars.color2 = newVars.color2;
  vars.animateColor1 = newVars.animateColor1;
  vars.animateColor2 = newVars.animateColor2;
  
  vars.radius = newVars.radius;
  vars.rotationOffsetRow = newVars.rotationOffsetRow;
  vars.rotationOffsetCol = newVars.rotationOffsetCol;
  vars.flipOffsetRow = newVars.flipOffsetRow;
  vars.flipOffsetCol = newVars.flipOffsetCol;
  vars.scaleFactorMin = newVars.scaleFactorMin;
  vars.scaleStartAngle = newVars.scaleStartAngle;

  vars.gridSpacing = newVars.gridSpacing;

  if (vars.animateColor1) {
    animColor1();
  }
  if (vars.animateColor2) {
    animColor2();
  }
  
  handleResize();
}

// dat.gui controls
const gui = new dat.GUI({ width: 350 });
const polyFolder = gui.addFolder('Polygon Drawing');
const controlSides = polyFolder.add(vars, 'sides', 3, 15).step(1).listen();
const controlRadius = polyFolder.add(vars, 'radius', 3, 80).listen();
const controlGridSpacing = polyFolder.add(vars, 'gridSpacing', 1, 100).listen();

const speedFolder = gui.addFolder('Rotation Speed');
speedFolder.add(vars, 'speed', 0.001, 0.09).listen();
speedFolder.add(vars, 'speedIncrement', 0.001, 0.09).listen();
speedFolder.add(vars, 'rotationOffsetRow', 0, 90).step(0.01).listen();
speedFolder.add(vars, 'rotationOffsetCol', 0, 90).step(0.01).listen();
speedFolder.add(vars, 'flipOffsetRow').listen();
speedFolder.add(vars, 'flipOffsetCol').listen();

const scaleFolder = gui.addFolder('Scaling');
scaleFolder.add(vars, 'scaleFactorMin', 0, 1).listen();
scaleFolder.add(vars, 'scaleStartAngle').listen();

const colorFolder = gui.addFolder('Colors');
colorFolder.addColor(vars, 'color1').listen();
colorFolder.addColor(vars, 'color2').listen();
const controlAnimateColor1 = colorFolder.add(vars, 'animateColor1').listen();
const controlAnimateColor2 = colorFolder.add(vars, 'animateColor2').listen();
colorFolder.add(vars, 'lineWidth', 0, 15).listen();

gui.close();
polyFolder.open();
speedFolder.open();
scaleFolder.open();
colorFolder.open();

controlGridSpacing.onChange(value => {
  handleResize();
});
controlAnimateColor1.onChange(value => {
  window.cancelAnimationFrame(color1Raf);
  if (value) {
    animColor1();
  }
});
controlAnimateColor2.onChange(value => {
  window.cancelAnimationFrame(color2Raf);
  if (value) {
    animColor2();
  }
});


const defaultPolyOptions = {
  x: 0,
  y: 0,
  sides: vars.sides,
  radius: 10,
  rotation: 0,
  startAngle: 0,
  anticlockwise: false,
  fill: '#00FF00',
  stroke: '#FF0000',
};

// Polygon class
function Polygon() {}

function addPoly(p_options) {
  const options = Object.assign({}, defaultPolyOptions, p_options);

  var poly = new Polygon;

  poly.x = options.x;
  poly.y = options.y;
  poly.sides = options.sides;
  poly.radius = options.radius;
  poly.rotation = options.rotation;
  poly.startAngle = options.startAngle;
  poly.fill = options.fill;
  poly.stroke = options.stroke;

  polys.push(poly);
}


function createPolys() {
  polys = [];
  const rowOffset = W / numCols;
  const colOffset = H / numRows;
  // maxRadius = radius;
  // rotationOffsetRow = vars.speedIncrement * 30;
  // rotationOffsetCol = vars.speedIncrement * 20;
  for (var i = 0; i < numCols; i++) {
    for (var m = 0; m < numRows; m++) {
      const startAngle = 360; // starts at 360 instead of 0 so that flipOffset doesn't create polys that are too big
      // console.log(i, m, startAngle);
      addPoly({
        x: i * rowOffset,
        y: m * colOffset,
        rowIndex: m,
        colIndex: i,
        startAngle,
        fill: 'transparent',
      });
    } 
  }
}


function addPoly(p_options) {
  const options = Object.assign({}, defaultPolyOptions, p_options);

  var poly = new Polygon;

  poly.x = options.x;
  poly.y = options.y;
  poly.sides = options.sides;
  poly.radius = options.radius;
  poly.rotation = options.rotation;
  poly.startAngle = options.startAngle;
  poly.fill = options.fill;
  poly.stroke = options.stroke;
  poly.rowIndex = options.rowIndex;
  poly.colIndex = options.colIndex;

  polys.push(poly);
}


// Draw and animate polygons
function draw() {
  const startColor = hexToRgb(vars.color1);
  const targetColor = hexToRgb(vars.color2);
  ctx.clearRect(0, 0, ctx.canvas.width, ctx.canvas.height);

  for (var i = 0; i < polys.length; i++) {
    const poly = polys[i];
    
    // rotate offset
    flipRow = vars.flipOffsetRow ? -1 : 1;
    flipCol = vars.flipOffsetCol ? -1 : 1;
    rotationOffsetRow = vars.speedIncrement * vars.rotationOffsetRow * flipRow;
    rotationOffsetCol = vars.speedIncrement * vars.rotationOffsetCol * flipCol;
    rotationOffset = (rotationOffsetRow * poly.rowIndex) + (rotationOffsetCol * poly.colIndex);
    poly.rotationOffset = rotationOffset;

    const colorPercent = Math.abs(180 - radians_to_degrees(poly.startAngle + rotationOffset) % 360) / 180;
    var r = lerp(startColor.r, targetColor.r, colorPercent);
    var g = lerp(startColor.g, targetColor.g, colorPercent);
    var b = lerp(startColor.b, targetColor.b, colorPercent);
    poly.colorPercent = colorPercent;
    poly.strokeColor = rgbToHex(r, g, b);

    drawPolygon(poly);

    poly.startAngle += vars.speed; // + speedModifier; // - (vars.speedIncrement * i);
  }
}

function radians_to_degrees(radians) {
  var pi = Math.PI;
  return radians * (180/pi);
}

function drawPolygon(poly) {
  const {
    x,
    y,
    sides,
    // radius,
    startAngle,
    anticlockwise,
    stroke,
    fill,
    strokeColor,
    rotationOffset,
    colorPercent,
  } = poly;

  // do not draw invalid polygon
  if (sides < 3) return;

  ctx.beginPath();

  ctx.strokeStyle = strokeColor; // vars.strokeColor;
  ctx.lineWidth = vars.lineWidth;
  ctx.fillStyle = fill;

  ctx.shadowColor = vars.glowColor;
  ctx.shadowBlur = vars.glowSize;
  ctx.shadowOffsetX = 0;
  ctx.shadowOffsetY = 0;

  var a = (Math.PI * 2) / vars.sides;
  a = anticlockwise ? -a : a;
  ctx.save();
  ctx.translate(x + (vars.radius * 0.25), y + (vars.radius * 0.25));
  
  // rotate offset
  // rotationOffsetRow = vars.speedIncrement * 30;
  // rotationOffsetCol = vars.speedIncrement * 20;
  // rotationOffset = (rotationOffsetRow * poly.rowIndex) + (rotationOffsetCol * poly.colIndex);
  
  ctx.rotate(startAngle + rotationOffset);
  const rotateScale = vars.scaleFactorMin + ((1 - vars.scaleFactorMin) * colorPercent);

  const startAngleModifier = vars.scaleStartAngle ? rotateScale : 1;
  ctx.moveTo(vars.radius * startAngleModifier, 0);
  
  // ctx.drawImage(img, x/sides, y/sides, radius, radius);
  for (var i = 1; i < vars.sides; i++) {
    ctx.lineTo(vars.radius * rotateScale * Math.cos(a * i), vars.radius * rotateScale * Math.sin(a * i));
  }
  
  ctx.closePath();

  ctx.stroke();
  ctx.fill();

  ctx.restore();
}

function animate() {
  draw();
  raf(animate);
}



// Color Tweening
let targetColor1;
let color1StartRGB;
let color1TargetRGB;
const color1AnimDuration = 90;
let color1AnimIndex = 0;
let color1Raf = null;

function animColor1() {
  targetColor1 = colors[Math.floor(Math.random() * colors.length)];
  while (targetColor1 === vars.color1) {
    targetColor1 = colors[Math.floor(Math.random() * colors.length)];
  }
  color1StartRGB = hexToRgb(vars.color1);
  color1TargetRGB = hexToRgb(targetColor1);

  color1AnimIndex = 0;
  color1Raf = raf(stepColor1Animation);
}
function stepColor1Animation() {
  color1AnimIndex += 1;
  const progress = color1AnimIndex / color1AnimDuration;
  var r = lerp(color1StartRGB.r, color1TargetRGB.r, progress);
  var g = lerp(color1StartRGB.g, color1TargetRGB.g, progress);
  var b = lerp(color1StartRGB.b, color1TargetRGB.b, progress);
  vars.color1 = rgbToHex(r, g, b);

  if (progress < 1) {
    color1Raf = raf(stepColor1Animation);
  } else {
    if (vars.animateColor1) {
      animColor1();
    }
  }
}




let targetColor2;
let color2StartRGB;
let color2TargetRGB;
const color2AnimDuration = 90;
let color2AnimIndex = 0;
let color2Raf = null;

function animColor2() {
  targetColor2 = colors[Math.floor(Math.random() * colors.length)];
  while (targetColor2 === vars.color2) {
    targetColor2 = colors[Math.floor(Math.random() * colors.length)];
  }
  color2StartRGB = hexToRgb(vars.color2);
  color2TargetRGB = hexToRgb(targetColor2);

  color2AnimIndex = 0;
  color2Raf = raf(stepColor2Animation);
}
function stepColor2Animation() {
  color2AnimIndex += 1;
  const progress = color2AnimIndex / color2AnimDuration;
  var r = lerp(color2StartRGB.r, color2TargetRGB.r, progress);
  var g = lerp(color2StartRGB.g, color2TargetRGB.g, progress);
  var b = lerp(color2StartRGB.b, color2TargetRGB.b, progress);
  vars.color2 = rgbToHex(r, g, b);

  if (progress < 1) {
    color2Raf = raf(stepColor2Animation);
  } else {
    if (vars.animateColor2) {
      animColor2();
    }
  }
}



function hexToRgb(hex) {
  var result = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(hex);
  return result ? {
    r: parseInt(result[1], 16),
    g: parseInt(result[2], 16),
    b: parseInt(result[3], 16)
  } : null;
}

function componentToHex(c) {
  var hex = c.toString(16);
  return hex.length == 1 ? "0" + hex : hex;
}

function rgbToHex(r, g, b) {
  return "#" + componentToHex(r) + componentToHex(g) + componentToHex(b);
}

function lerp(start, end, progress) {
  progress = progress < 0 ? 0 : progress;
  progress = progress > 1 ? 1 : progress;
  return Math.round(start + (end - start) * progress);
}

// Instantiate polygons
createPolys();
animate();

if (vars.animateColor1) {
  animColor1();
}
if (vars.animateColor2) {
  animColor2();
}
!
999px

Console