let sight = [];

let bgc = 100

function setup() {

  createCanvas(400, 400);

  background(bgc);

  for(let i = 0; i < 5; i++){

    line(random(width), random(height), random(width), random(height));

  }

  angleMode(DEGREES);

  loadPixels();

  stroke(255, 255, 255);

  for(let i = 0; i < rays; i++){

    ray(200, 200, i * (360 / rays));

  }

  fill(255, 0, 0);

  circle(200, 200, 10);

}

​

function draw() {

  stroke(255, 0, 0);

  strokeWeight(5);

  for(let i = 0; i < sight.length; i++){

    point(sin(sight[i][0]) * sight[i][1] + 200, cos(sight[i][0]) * sight[i][1] + 200);

  }

}

​

function ray(x, y, r){

  if(pixels[(round(x) + round(y) * width) * 4] === bgc && x < width && y < height && y > 0 && x > 0){

    point(sin(r) + x, cos(r) + y);

    ray(sin(r) + x, cos(r) + y, r)

  }

  else{

    sight.push([r, dist(200, 200, x, y)]);

  }

}