constructor(location = createVector(random(width), random(height))) {

        this.location = location;

        this.velocity = createVector(0, 0);

        this.acceleration = createVector(0, 0);

        this.maxSpeed = 5;

        this.maxForce = 1;

        this.mass = 1;

    }

​

    seek(target) {

        let v = p5.Vector.sub(target, this.location);

        v.normalize();

        v.mult(this.maxSpeed);

        this.applyForce(p5.Vector.sub(v, this.velocity).limit(this.maxForce));

    }

​

    act() {

        this.seek(createVector(mouseX, mouseY));

        this.update();

        this.draw();

    }

​

    update() {

        this.velocity.add(this.acceleration);

        this.location.add(this.velocity);

        this.acceleration.mult(0);

    }

​

    applyForce(force) {

        this.acceleration.add(p5.Vector.div(force, this.mass));

    }

​

    draw() {

        if( abs(degrees(this.velocity.heading())) > 90 ) {

            push();

            translate(this.location.x+50, this.location.y+50);

            rotate(radians(degrees(this.velocity.heading())+45));

            image(birdthree, 0, 0, 100, 100);

            pop();

        } else {

            push();

            translate(this.location.x+50, this.location.y+50);      

            rotate(radians(degrees(this.velocity.heading())-45));

            image(birdthree, 0, 0, 100, 100);

            pop();

        }

    }

}