var positionX = [320];

var positionY = [300];

var velocityX = [0];

var velocityY = [0];

​

​

​

function setup() {

  createCanvas(windowWidth, windowHeight);

  noStroke();

  fill(64, 255, 255, 192);

}

​

​

​

function draw() {

  background(32,25);

​

  for (var particleA = 0; particleA < mass.length; particleA++) {

    var accelerationX = 0,

      accelerationY = 0;

​

    for (var particleB = 0; particleB < mass.length; particleB++) {

      if (particleA != particleB) {

        var distanceX = positionX[particleB] - positionX[particleA];

        var distanceY = positionY[particleB] - positionY[particleA];

​

        var distance = sqrt(distanceX * distanceX + distanceY * distanceY);

        if (distance < 1) distance = 1;

​

        var force =  2*mass[particleB] / (distance*distance);

        accelerationX += force * distanceX;

        accelerationY += force * distanceY;

      }

    }

​

    velocityX[particleA] = velocityX[particleA] * 1 + accelerationX ;

    velocityY[particleA] = velocityY[particleA] * 1 + accelerationY * 1;

  }

​

  for (var particle = 0; particle < mass.length; particle++) {

    positionX[particle] += velocityX[particle];

    positionY[particle] += velocityY[particle];

     if(particle==0){

       ellipse(positionX[particle], positionY[particle], mass[particle] * 2, mass[particle] * 2);

     } else{

       ellipse(positionX[particle], positionY[particle], mass[particle] * 5000, mass[particle] * 5000);

     }

  }

}

​

​

​

function addNewParticle() {

  mass.push(random(0.001, 0.002));

  positionX.push(mouseX);

  positionY.push(mouseY);

  velocityX.push(10);

  velocityY.push(5);

}

​

​

​

function mouseClicked() {

  addNewParticle();

}

​

​

function mouseDragged() {

  addNewParticle();

}