Genuary Day 9: Interference Patterns

mySketch
xxxxxxxxxx
 
const colorPalettes = [
  ["#1a0120", "#553d36", "#684a52", "#857885", "#87a0b2", "#a4bef3", "#ffffff"],
  ["#335c67","#fff3b0","#e09f3e","#9e2a2b","#540b0e"],
  ["#355070","#6d597a","#b56576","#e56b6f","#eaac8b"],
  ["#007f5f","#2b9348","#55a630","#80b918","#aacc00","#bfd200","#d4d700","#dddf00","#eeef20","#ffff3f", "#ffffaf", "#ffffff"]
]
​
​
function setup() {
  const numPoints = floor(random(random(1, 3), random(3, 9)));
  const squareSize = floor(random(3, 18));
  const numBands = floor(random(1, 3));
  const p = random()**0.4;
  const colors = random(colorPalettes);
  
  createCanvas(windowWidth, windowHeight);
  noStroke();
  background(colors[0])
​
  const points = [];
  const bands = [];
​
  for (let i = 0; i < numPoints; i++) {
    points.push({
      x: random() < 0.5 ? random(width * 0.3, 0) : random(width, width * 1.3),
      y: random() < 0.5 ? random(height * 0.3, 0) : random(height, height * 1.3),
      period: random(0.008/3, 0.1/3)*numPoints
    });
  }
​
  for(let i = 0; i < numBands; i++){
    let start = random(-1, 1);
    let end = start + random(0.05, 0.25);
    bands.push({
      start,
      end,
      color: "white",
      chess: random() < 0.5
    });
  }
  
​
  for (let x = 0; x < width; x += squareSize) {
    for (let y = 0; y < height; y += squareSize) {
      let value = 0;
      for (let point of points) {
        value += sin(dist(x, y, point.x, point.y) * point.period) *
          map(noise(x * 0.01, y * 0.01, point.x * 0.03, point.y * 0.03), 0.2, 0.8, -0.2, 1);
      }
      
      value /= numPoints/2;
      
      if(value > 0){
        value **= p
      }else{
        value = -(abs(value)**p);
      }
      
      fill(colors[wrapModulo(floor(map(value, -1, 1, 0, colors.length)), colors.length)]);
​
      for(let band of shuffle(bands)){
        if ( value > band.start && value < band.end){
          if(!band.chess || x/squareSize % 2 === y/squareSize % 2) {
            fill(band.color);
          }
        }
      }
      
      square(x, y, squareSize);
    }
  }
​
}
​
function keyPressed() {
  if (key == "s") save();
  else if (key == " ") setup();
}
​
function wrapModulo(a, b){
  if(a < 0) return a+b;
  return a%b;
}