party

let vecLocation =[];

let vecVelocity =[];

const NUM =50;

​

function setup() {

  createCanvas(windowWidth, windowHeight);

  frameRate(30);

  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();

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

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

    ellipse(vecLocation[i].x, vecLocation[i].y, 20, 20);

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

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

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

    }

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

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

    }

  } 

}