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HTML
!

CSS 

              
                /* Make the canvas element fill the screen. */
canvas {
  display: block;
  position: absolute;
  top: 0;
  left: 0;
  border: none;
  margin: 0;
  z-index: -1;
}
!

JS 

              
                //// ---- DAT.GUI CODE ---- ////
let params = { 
  horizontalVoronoiDivisions: 7,
  verticalVoronoiDivisions: 9,
  voronoiIrregularity: 0.2,
  innerShapes: 6,
  innerShapeAngle: 0.02,
  shadeVariance: 0.07,
  lineThickness: 0.6,
  hueStart: 0,
  hueEnd: 90,
  brightness: 95,
  saturation: 100,
  offset: -80,
  animationSpeed: 500,
  animate: false,
  hideText: false,
  createNew: function(){
    resetVoronoiDesign();
  },
}

let gui = new dat.GUI();

let voronoiFolder = gui.addFolder("Voronoi Diagram");
let sketchFolder = gui.addFolder("Sketch Overlay");
let colourFolder = gui.addFolder("Colours");

voronoiFolder.add(params, "horizontalVoronoiDivisions", 1, 20, 1).name("Horiz. Divisions").onChange(function() {
	resetVoronoiDesign();
});
voronoiFolder.add(params, "verticalVoronoiDivisions", 1, 20, 1).name("Vert. Divisions").onChange(function() {
	resetVoronoiDesign();
});
voronoiFolder.add(params, "voronoiIrregularity", 0, 0.5).name("Irregularity").onChange(function() {
	resetVoronoiDesign();
});
sketchFolder.add(params, "innerShapes", 0, 30, 1).name("Inner Shapes").onChange(function() {
	renderVoronoiDesign();
});
sketchFolder.add(params, "innerShapeAngle", 0, 1).name("Inner Angle").onChange(function() {
	renderVoronoiDesign();
});
sketchFolder.add(params, "lineThickness", 0, 5).name("Thickness").onChange(function() {
	renderVoronoiDesign();
});

colourFolder.add(params, "shadeVariance", 0, 0.99).name("Hue Variance").onChange(function() {
  renderVoronoiDesign();
});
colourFolder.add(params, "hueStart", -30, 360, 1).name("Hue Start").onChange(function() {
	renderVoronoiDesign();
});
colourFolder.add(params, "hueEnd", 0, 390, 1).name("Hue End").onChange(function() {
	renderVoronoiDesign();
});
colourFolder.add(params, "saturation", 0, 100, 1).name("Saturation").onChange(function() {
	renderVoronoiDesign();
});
colourFolder.add(params, "brightness", 0, 100, 1).name("Brightness").onChange(function() {
	renderVoronoiDesign();
});
colourFolder.add(params, "offset", -100, 100, 1).name("Edge Offset").onChange(function() {
	renderVoronoiDesign();
});

gui.add(params, "hideText").name("Hide Text").onChange(function() {
	renderVoronoiDesign();
});

gui.add(params, "animate").name("Animate");

gui.add(params, "createNew").name("Generate New Design");

let delaunay, voronoi, polygons, voronoiPoints, scaledVoronoiPoints, shapes;

function setup(){
  createCanvas(windowWidth, windowHeight); 
  colorMode(HSB, 360, 100, 100, 1); 
  rectMode(CENTER);
  
  textSize(22);
  textAlign(CENTER);
  textStyle(BOLD);
  textFont('Courier New');
  
  resetVoronoiDesign();
}

function windowResized() {
  resizeCanvas(windowWidth, windowHeight);
  renderVoronoiDesign();
}

function renderVoronoiDesign(){
  scaleVoronoiPoints();
  createVoronoiPolygons();
  createShapes();
  drawShapes();
  
  if (params.hideText == false){
    drawText();
  }
}

function resetVoronoiDesign(){
  noiseSeed(frameCount);
  createVoronoiPoints();
  renderVoronoiDesign();
}

function createVoronoiPoints(){
  voronoiPoints = [];
  //The following code is derived from this StackOverflow answer
  //https://stackoverflow.com/questions/3667927/do-randomly-generated-2d-points-clump-together-and-how-do-i-stop-it
  let randomnessFactor = params.voronoiIrregularity;

  for (let ySubDivisions = 0; ySubDivisions < params.verticalVoronoiDivisions; ++ySubDivisions){
    for (let xSubDivisions = 0; xSubDivisions < params.horizontalVoronoiDivisions; ++xSubDivisions){
      let regularity = 0.5 * (1 - randomnessFactor);
      let x = regularity + randomnessFactor * random(0, 1) + xSubDivisions / (params.horizontalVoronoiDivisions - 1);
      let y = regularity + randomnessFactor * random(0, 1) + ySubDivisions / (params.verticalVoronoiDivisions - 1);
      voronoiPoints.push([x - 0.5, y - 0.5]);
    }
  }
}

function scaleVoronoiPoints(){
  scaledVoronoiPoints = [];
  for (let i = 0; i < voronoiPoints.length; i++){
    scaledVoronoiPoints.push([voronoiPoints[i][0] * windowWidth, voronoiPoints[i][1] * windowHeight]);
  }
}

function createVoronoiPolygons(){
  delaunay = d3.Delaunay.from(scaledVoronoiPoints);
  voronoi = delaunay.voronoi([0, 0, windowWidth, windowHeight]);
  polygons = voronoi.cellPolygons();
}

function drawText(){
  noStroke();
  fill(250);
  rect(windowWidth / 2 - 1, windowHeight - 33, 226, 30)
  fill(0);
  text("VORONOI SKETCHES", windowWidth / 2, windowHeight - 26);
}

function createShapes(){
  shapes = [];
  for (const cell of polygons){
    if (cell.index % 1 == 0){
      shapes.push(new RecursiveShape(cell.length - 1, cell));
      shapes[shapes.length - 1].generateShapePoints();
    }
  }
}

function draw(){
  if (params.animate == true){
    if (frameCount % 2 == 0){
      let innerShapeAngle = lerp(0, 0.1, (sin(frameCount/100) + 1) / 2);

      for (let i = 0; i < shapes.length; i++){
        shapes[i].innerShapeRotation = innerShapeAngle;
        shapes[i].generateShapePoints();
        shapes[i].draw();
      }

      if (params.hideText == false){
        drawText();
      }
    }
  }
}

function drawShapes(){
  background(0);
  for (const shape of shapes){
    shape.draw();
  }
}

function RecursiveShape(shapeSides, shapePoints){
  this.baseShapePoints = shapePoints.map((x) => x);
  this.numberOfShapeSides = shapeSides;
  this.shapePoints = [];
  this.numberOfInnerShapes = params.innerShapes;
  this.innerShapeRotation = params.innerShapeAngle;
  
  this.generateShapePoints = function() {
    this.shapePoints = this.baseShapePoints.map((x) => x);
    for (let i = 0; i < this.numberOfInnerShapes; i++){
      for (let j = 0; j < this.numberOfShapeSides; j++){
        let firstPoint = this.shapePoints[i * (this.numberOfShapeSides + 1) + j];
        let secondPoint = this.shapePoints[i * (this.numberOfShapeSides + 1) + ((j + 1) % this.numberOfShapeSides)];
        let xPosition = lerp(firstPoint[0], secondPoint[0], this.innerShapeRotation);
        let yPosition = lerp(firstPoint[1], secondPoint[1], this.innerShapeRotation);
        this.shapePoints.push([xPosition, yPosition]);
      }
      this.shapePoints.push([this.shapePoints[i * (this.numberOfShapeSides + 1) + (this.numberOfShapeSides + 1)][0], this.shapePoints[i * (this.numberOfShapeSides + 1) + (this.numberOfShapeSides + 1)][1]]);
    }
  }
  
  this.draw = function() {
    strokeWeight(params.lineThickness);
    
    let intensity = noise(this.shapePoints[0][0] / (windowWidth * (1 - params.shadeVariance)), this.shapePoints[0][1] / (windowHeight * (1 - params.shadeVariance)), frameCount / params.animationSpeed);
    
    let cellColour = color(lerp(params.hueStart, params.hueEnd, intensity), params.saturation, params.brightness);
    let strokeColour = color(lerp(params.hueStart, params.hueEnd, intensity), params.saturation, params.brightness + params.offset);
    
    fill(cellColour);
    stroke(strokeColour);
    
    beginShape();
    for (let i = 0; i < this.shapePoints.length; i++){
      vertex(this.shapePoints[i][0], this.shapePoints[i][1]);
    }
    endShape();
    
    noFill();

    for (let i = 0; i < this.numberOfInnerShapes + 1; i++){
      for (let j = 0; j < this.numberOfShapeSides + this.numberOfInnerShapes; j++){
        line(this.shapePoints[i * this.numberOfShapeSides + j][0], this.shapePoints[i * this.numberOfShapeSides + j][1], this.shapePoints[i * this.numberOfShapeSides + j + 1][0], this.shapePoints[i * this.numberOfShapeSides + j + 1][1]);
      }
    }
  }
}
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999px

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