let eccentricity = 0.7

​

class Mover {

  constructor(x, y, m, v) {

    this.pos = createVector(x, y);

    this.vel = v;

    this.vel.mult((1 + q) * (1 + eccentricity));

    this.acc = createVector(0, 0);

    this.mass = m;

    this.r = sqrt(this.mass) * 2;

  }

​

  applyForce(force) {

    let f = p5.Vector.div(force, this.mass);

    this.acc.add(f);

  }

​

  attract(mover) {

    let force = p5.Vector.sub(this.pos, mover.pos);

    let distanceSq = constrain(force.magSq(), 100, 1000);

    let G = 5;

    let strength = G * (this.mass * mover.mass) / distanceSq;

    force.setMag(strength);

    mover.applyForce(force);

  }

  update() {

    this.vel.add(this.acc);

    this.pos.add(this.vel);

    this.acc.set(0, 0);

  }

​

  show() {

    stroke(255);

    strokeWeight(2);

    fill(255, 100);

    ellipse(this.pos.x, this.pos.y, this.r * 2);

    line(this.pos.x, this.pos.y, 1)

  }

}