let pivot;

let next;

let angle = 90;

​

let offset = 50;

let numPoints = 10;

​

let clack;

​

function preload() {

  soundFormats('wav');

  clack = loadSound('clack');

}

​

function setup() {

  createCanvas(windowWidth, windowHeight);

  pivot = createVector(width/2, height/2)

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

    let x = offset + random(width - offset);

    let y = offset + random(height - offset);

​

    points.push(createVector(x, y))

  }

​

  for (let p of points) {

    let temp = [];

    for (let otherP of points) {

      if(p !== otherP) {

        if(p.x <= otherP.x) {

            temp.push(otherP)

        }

      }

    }

​

    if(temp.length === floor(points.length/2)) {

      pivot = p

    }

  }

}

​

function draw() {

  background("#171e26");

  rectMode(CENTER);

  angleMode(DEGREES)

  push();

  stroke("#b25f03");

  noFill();

  strokeWeight(2);

  let a = createVector(pivot.x - cos(angle) * height * 10, pivot.y - sin(angle) * height * 10)

  let b = createVector(pivot.x + cos(angle) * height * 10, pivot.y + sin(angle) * height * 10)

  line(a.x, a.y, b.x, b.y)

  pop();

  for (let p of points) {

    if (p !== pivot) {

      stroke(255);

      strokeWeight(8);

      point(p.x, p.y); 

    } else {

      stroke("#fff44f");

      strokeWeight(10);

      point(p.x, p.y); 

    }

  }

  for (let point of points) {

     if (point !== pivot) {

       let tanInvS = floor(atan2(point.y - pivot.y, point.x - pivot.x))

        tanInvS = tanInvS < 0 && tanInvS + 360 || tanInvS

        tanInvS = tanInvS > 180 && tanInvS - 180 || tanInvS

        let sec = angle;

        sec = sec > 180 && sec - 180 || sec;

        if(tanInvS === sec) next = point;       

     } 

  }

  angle += 0.25;

  if(angle >= 360) angle = 0;

  if(next) {

    clack.play();

    pivot = next;

    next = null;

  }

}