Blood

let vecLocation = []; 

let vecVelocity = []; 

const NUM = 100;

​

function setup() {

  createCanvas(windowWidth, windowHeight); 

  frameRate(60); 

  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(140,40,40); 

  let diameter = random(70);

  noStroke(); 

  fill(random(127, 255), random(0, 127), random(0, 127), 127); 

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

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

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

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

    vecVelocity[i].x = vecVelocity[i].x * -1; 

    }

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

    vecVelocity[i].y = vecVelocity[i].y * -1; 

   }

  }

}