我が故郷

let img; 

function preload() {

  img = loadImage('./Hikonejo-castle-1.jpg');

}

function setup() {

  createCanvas(windowWidth, windowHeight);

  img.resize(width, height);

  background(0);

  rectMode(CENTER);

}

function draw() {

  for (let i = 0; i < 100; i++) { 

    let x = int(random(width));

    let y = int(random(height));

    let col = img.get(x, y);

    noStroke();

    let rotation = map(saturation(col), 0, 255, 0, 360);

    let length = map(brightness(col), 0, 255, 0, 100);

    fill(red(col), green(col), blue(col), 50);

    push();

    translate(x, y);

    rotate(radians(rotation));

    rect(0, 0, 2, length);

    pop();

  }

}