constructor(x, y) {

    this.position = createVector(x, y);

    this.velocity = createVector(0, 0);

    this.acceleration = createVector(0, 0);

    this.r = 10;

    this.maxspeed = 1;

    this.maxforce = 0.5;

  }

​

  wander() {

    let angle = noise(this.xoff) * TWO_PI * 2;

    let steer = p5.Vector.fromAngle(angle);

    steer.setMag(this.maxForce);

    this.applyForce(steer);

    this.xoff += 0.01;

  }

  //The pursue method is figuring out the predicted future position and calling the seek() method

  pursue(vehicle) {

    let target = vehicle.position.copy();

    let prediction = vehicle.velocity.copy();

    prediction.mult(10); //looking 10 steps ahead

    target.add(prediction);

    fill(0, 255, 0);

    //circle(target.x, target.y, 10); //to visualise the prediction

    return this.seek(target);

  }

​

  seek(target) {

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

    desired.setMag(this.maxspeed);

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

    steer.limit(this.maxforce);

    return steer;

  }

  evade(vehicle) {

    let pursuit = this.pursue(vehicle);

    pursuit.mult(-1);

    return pursuit;

  }

​

​

  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 + HALF_PI); 

  image(boat, -50, -50, 100, 100); 

  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 = p5.Vector.random2D(); //gives it a random direction - normalized

    this.velocity.mult(5); 

  }

​

  show() {

  let angle = this.velocity.heading();

  fill(127);

  stroke(0);

  push();

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

  rotate(angle + HALF_PI); // Subtract HALF_PI to adjust the rotation by 90 degrees

  image(fishies, -50, -50,50, 50); // Display the image with the tip at the center

  pop();

}

}

​

class Target2 extends Vehicle {

  constructor(x, y) {

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

    this.velocity = p5.Vector.random2D(); //gives it a random direction - normalized

    this.velocity.mult(5); 

  }

​

  show() {

  let angle = this.velocity.heading();

  fill(127);

  stroke(0);

  push();

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

  rotate(angle + HALF_PI); 

  image(shark, -50, -50,80, 120); 

  pop();

}

}

​