constructor(x, y) {

    this.position = createVector(x, y);

    this.velocity = createVector(0, 0);

    this.acceleration = createVector(0, 0);

    this.r = 2;

    this.maxspeed = 0.5;

    this.maxforce = 0.1;

  }

​

​

  seek(target) {

    let desired = p5.Vector.sub(target.position, this.position);

    desired.setMag(this.maxspeed);

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

    steer.limit(this.maxforce);

    return steer;

  }

​

  flee(target) {

    return this.seek(target).mult(-1);

  }

​

  applyForce(force) {

    this.acceleration.add(force);

  }

​

  update() {

    this.velocity.add(this.acceleration);

    this.velocity.limit(this.maxspeed);

    this.position.add(this.velocity);

    this.acceleration.mult(0);

  }

​

  show() {

    let angle = this.velocity.heading();

    fill(127);

    stroke(0);

    push();

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

    rotate(angle);

    beginShape();

    triangle(-this.r, -this.r / 2, -this.r, this.r / 2, this.r, 0);

    endShape(CLOSE);

    pop();

  }

​

  edges() {

    if (this.position.x > width + this.r) {

      this.position.x = -this.r;

    } else if (this.position.x < -this.r) {

      this.position.x = width + this.r;

    }

    if (this.position.y > height + this.r) {

      this.position.y = -this.r;

    } else if (this.position.y < -this.r) {

      this.position.y = height + this.r;

    }

  }

}

​

​

​

​

​

​

​

//creating a new class for the moving target that inherents from the parent class Vehicle

​

class Target extends Vehicle {

  constructor(x, y) {

    super(x, y); //calls the parent's constructor

    this.velocity = createVector(1,0); //gives it a random direction - normalized

    // this.velocity.mult(5); 

    this.acceleration = createVector(0, 0);

    this.r = 2;

    this.maxspeed = 0.5;

    this.maxforce = 0.2;

    this.wanderTheta = 0;

  }

​

  wander() {

    // creating projected wandering point

    let wanderPoint = this.velocity.copy();

    wanderPoint.setMag(100);

    wanderPoint.add(this.position);

    //displaying wandering point

    fill(255, 0, 0);

    noStroke();

    // circle(wanderPoint.x, wanderPoint.y, 8);

​

    //creating a circular path around my wandering point

    let wanderRadius = 3;

    noFill();

    stroke(0);

    // circle(wanderPoint.x, wanderPoint.y, wanderRadius * 2);

    // line(this.position.x, this.position.y, wanderPoint.x, wanderPoint.y);

​

    //the angle is relevant to the direction the vehicle's current velocity

    let theta = this.wanderTheta + this.velocity.heading();

​

    //finding the point on the circumference of the circular path, remember polar to cartesian coordinates

    let x = wanderRadius * cos(theta);

    let y = wanderRadius * sin(theta);

    wanderPoint.add(x, y);

    //displaying new wandering point on circular path and line to it

    // fill(0, 255, 0);

    // noStroke();

    // circle(wanderPoint.x, wanderPoint.y, 10);

    // stroke(0);

    // line(this.position.x, this.position.y, wanderPoint.x, wanderPoint.y);

​

    //the steering force here is equivalent to the desired velocity = target-position

    let steer = wanderPoint.sub(this.position);

    steer.setMag(this.maxForce);

    this.applyForce(steer);

​

    //random displacement along the circumference

    let displaceRange = 0.3;

    this.wanderTheta += random(-displaceRange, displaceRange);

  }

​

}

​