Sphere of Gravitaion

let num = 100;

var angle= [];

var r = [];

var vecLocation = [];

let c = [];

var anglePlus = [];

var rPlus = [];

let ballSize = [];

​

function setup() {

  createCanvas(windowWidth, windowHeight);

  frameRate(60);

  background(0);

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

    angle[i] = 0;

    r[i] = 0;

    c[i] = color(random(255), random(255), random(255), 170);

    anglePlus[i] = random(-10, 10);

    rPlus[i] = random(600);

    ballSize[i] = random(40, 100);

    }

}

​

function draw() {

  noStroke();

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

    push();

    translate(width/2, height/2);

    vecLocation[i] = createVector(sin(radians(angle[i]))*r[i],  (cos(radians(angle[i]))*r[i]));

    fill(c[i]);

    ellipse(vecLocation[i].x, vecLocation[i].y, ballSize[i]/4, ballSize[i]/4);

    angle[i] += anglePlus[i]/3;

    r[i] += rPlus[i]/100;

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

      rPlus[i] = rPlus[i]*-1;

      }

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

      rPlus[i] = rPlus[i]*-1;

      }

    pop();

    }

  }

​

​