Random color&size

let num = 100;

let vecLocation = [];

let vecVelocity = [];

let vecColor = [];

let arrSize = [];

​

function setup() {

  createCanvas(windowWidth, windowHeight);

  frameRate(100);

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

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

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

    vecColor[i] = createVector(random(255), random(255), random(255));

    arrSize[i] = random(10, 50);

  }

}

​

function draw() {

  background(0);

  noStroke();

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

    fill(vecColor[i].x, vecColor[i].y, vecColor[i].z);

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

    ellipse(vecLocation[i].x, vecLocation[i].y, arrSize[i], arrSize[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 > width){

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

    }

  }

}