class Vehicle {

  constructor(x, y) {

    this.position = createVector(x, y);

    this.velocity = createVector(0, 0);

    this.acceleration = createVector(0, 0);

    this.r = 6;

    this.maxspeed = 2;

    this.maxforce = 2;

  }

​

  // Method to update location

  update() {

    // Update velocity

    this.velocity.add(this.acceleration);

    // Limit speed

    this.velocity.limit(this.maxspeed);

    this.position.add(this.velocity);

    // Reset acceleration to 0 each cycle, at each moment of time I'm evaluating the forces acting on me

    this.acceleration.mult(0);

  }

​

  applyForce(force) {

    // We could add mass here if we want A = F / M

    this.acceleration.add(force);

  }

​

  // A method that calculates a steering force towards a target

  // STEER = DESIRED MINUS VELOCITY

  seek(target) {

    let desired = p5.Vector.sub(target, this.position); // A vector pointing from the location to the target

​

    // Scale to maximum speed

    desired.setMag(this.maxspeed);

    desired.mult(-1);

​

    // Steering = Desired minus velocity

    let steer = p5.Vector.sub(desired, this.velocity);

    steer.limit(this.maxforce); // Limit to maximum steering force

​

    this.applyForce(steer);

  }

  show() {

    //Vehicle is a triangle pointing in the direction of velocity

    let angle = this.velocity.heading();

    fill(127);

    stroke(0);

    push();

    translate(this.position.x, this.position.y);

    rotate(angle);

    beginShape();

    vertex(this.r * 2, 0);

    vertex(-this.r * 2, -this.r);

    vertex(-this.r * 2, this.r);

    endShape(CLOSE);

    pop();

  }

}

​