RandBalls

let count = 0;

let num = 50; 

let r = 20;

let next = 100;

let vecLocation = []; 

let vecVelocity = []; 

function setup() { 

  createCanvas(windowWidth, windowHeight); 

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

    vecLocation[i] = createVector(width / 2, height / 2);

    vecVelocity[i] = createVector(random(-10,10), random(-10, 10)); 

  } 

}

​

​

​

function draw() {

  background(0); 

  noStroke();  

  if (count == next)

    {

      r = random(30);

      fill(random(360), random(360), random(360));

      count = 0;

    }

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

    vecLocation[i].add(vecVelocity[i]);

    ellipse(vecLocation[i].x, vecLocation[i].y, r, r); 

​

    if (vecLocation[i].x > width)

      {

        vecVelocity[i].x = random(-10, -1); 

      }

    if (vecLocation[i].x < 0) { 

      vecVelocity[i].x = random(1, 10); 

    }

    if (vecLocation[i].y < 0) {

      vecVelocity[i].y = random(1, 10);

    }

    if (vecLocation[i].y > height) { 

      vecVelocity[i].y = random(-10, -1);

    }

  }

  count++;

}