class Projectile {
    PVector position, next, velocity;

    Projectile(PVector pos, PVector vel) {
        position = pos.copy();
        velocity = vel.copy();
    }

    void move() {
        next = PVector.add(position, velocity);

        // Check if projectile is offscreen
        if (next.x < -PROJECTILE_RADIUS || next.x > width+PROJECTILE_RADIUS || next.y < -PROJECTILE_RADIUS || next.y > height+PROJECTILE_RADIUS)
            projectiles.remove(this);
        
        // Check for reflection across 'Walls'
        for (int i = 0; i < walls.size(); i++)
            reflect(this, walls.get(i));

        // Reflect any other projectile across this projectile's path
        // for (int j = 0; j < projectiles.size(); j++) {
        //     Projectile A = projectiles.get(j);
        //     if (A != this) {
        //         Wall B = new Wall(position, next);
        //         reflect(A, B);
        //     }
        // }
        position = next.copy();
    }

    void show() {
        stroke(255);
        fill(255);
        ellipse(position.x, position.y, PROJECTILE_RADIUS*2, PROJECTILE_RADIUS*2);
    }
}