let pickedStarColors;

let video;

let time = 0; // Variable to control the animation

​

function setup() {

  pickedStarColors = someStarColors(3, myStarColors);

  createCanvas(windowWidth, windowHeight);

  background('#21285F');

  // Create a video capture object

  video = createCapture(VIDEO);

  video.size(width, height);

  video.hide(); // Hide the default video element

}

​

function draw() {

  background('#21285F');

  // Get brightness of the webcam

  video.loadPixels();

  let brightness = 0;

  for (let y = 0; y < video.height; y++) {

    for (let x = 0; x < video.width; x++) {

      let index = (x + y * video.width) * 4;

      brightness += (video.pixels[index] + video.pixels[index + 1] + video.pixels[index + 2]) / 3;

    }

  }

  brightness /= (video.width * video.height);

​

  // Map brightness to rotation angle

  let rotation = map(brightness, 0, 255, 0, TWO_PI);

​

  // Map brightness to star scale

  let starScale = map(brightness, 0, 255, 10, 100);

  // Animate the size of the stars using a sine wave

  let animatedScale = 0.5 * (sin(time) + 1);

  let animatedStarScale = lerp(10, 100, animatedScale);

  let space = 50;

  for (let x = 0; x < width + 50; x += space) {

    for (let y = 0; y < height + 50; y += space) {

      drawStar(x, y, 5, 12, 5, rotation);

      drawStar(x + space / 2, y + space / 2, 4, animatedStarScale * 0.4, animatedStarScale, rotation);

    }

  }

  time += 0.05; // Increment the time variable for the next frame

}

​

function drawStar(x, y, radius1, radius2, npoints, rotation) {

  let angle = TWO_PI / npoints;

  let halfAngle = angle / 2.0;

​

  push();  

  translate(x, y);  

  rotate(rotation);

​

  beginShape();

  for (let a = 0; a < TWO_PI; a += angle) {

    let sx = cos(a) * radius2;

    let sy = sin(a) * radius2;

    vertex(sx, sy);

    sx = cos(a + halfAngle) * radius1;

    sy = sin(a + halfAngle) * radius1;

    vertex(sx, sy);

  }

  noStroke();

  fill(pick(pickedStarColors));

  endShape(CLOSE);

​

  pop();

}

​

// Randomization functions

function randomInteger(min, max) {

  return Math.floor(min + (max - min) * Math.random());

}

​

function pick(inputArray) {

  return inputArray[randomInteger(0, inputArray.length)];

}

​

function someStarColors(n, possibleStarColors) {

  let pickedStarColors = [];

  for (let i = 0; i < n; i++) {

    pickedStarColors.push(pick(possibleStarColors));

  }

  return pickedStarColors;

}