I think bullets come out now.

[rbdr/super-polarity] / Super Polarity / Actors / MainShip.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Content;
using Microsoft.Xna.Framework.Graphics;

namespace SuperPolarity
{
    class MainShip : Ship
    {

        public static Color BlueColor;
        public static Color RedColor;

        ParticleEngine particleEngine;

        protected bool Shooting;
        protected int ShotCooldown;

        public MainShip(Game newGame) : base(newGame) {}

        ~MainShip()
        {
            particleEngine = null;
        }

        public override void Initialize(Texture2D texture, Vector2 position)
        {
            base.Initialize(texture, position);

            MainShip.BlueColor = new Color(230, 244, 249);
            MainShip.RedColor = new Color(255, 234, 241);

            InitParticleEngine();
            SetPolarity(Polarity.Positive);

            ShotCooldown = 50;

            BindInput();
        }

        void InitParticleEngine()
        {
            particleEngine = ParticleEffectFactory.CreatePolarCircle(Position);
        }

        void BindInput()
        {
            InputController.Bind("moveX", HandleHorizontalMovement);
            InputController.Bind("moveY", HandleVerticalMovement);
            InputController.Bind("changePolarity", HandleChangePolarity);
            InputController.Bind("shoot", HandleShot);
        }

        protected void HandleShot(float value)
        {
            Children.Add(ActorFactory.CreateBullet(Position, Angle));
            Shooting = true;
            Timer t = new Timer(new TimerCallback(UnlockShot));
            t.Change(ShotCooldown, Timeout.Infinite);
        }

        protected void UnlockShot(object state)
        {
            InputController.Unlock("shoot");
        }

        protected void HandleChangePolarity(float value)
        {
            SwitchPolarity();
        }

        public void HandleHorizontalMovement(float value)
        {
            Acceleration.X = value * AccelerationRate;

            if (value > 0.1 && Velocity.X < 0 || value < 0.1 && Velocity.X > 0)
            {
                Acceleration.X *= 2;
            }

            if (value > 0.1 && Velocity.Y < 0 || value < 0.1 && Velocity.Y > 0)
            {
                Acceleration.Y *= 2;
            }
        }

        public void HandleVerticalMovement(float value)
        {
            Acceleration.Y = value * AccelerationRate;
        }

        public override void SwitchPolarity()
        {
            base.SwitchPolarity();
            SwitchParticleEngine(CurrentPolarity);
        }

        public override void SetPolarity(Polarity newPolarity)
        {
            base.SetPolarity(newPolarity);
            SwitchParticleEngine(newPolarity);
        }

        protected void SwitchParticleEngine(Polarity polarity)
        {
            if (polarity == Polarity.Positive)
            {
                particleEngine.Color = MainShip.RedColor;
            }
            else if (polarity == Polarity.Negative)
            {
                particleEngine.Color = MainShip.BlueColor;
            }
            else
            {
                particleEngine.Color = Color.Gray;
            }
        }

        public override void Update(GameTime gameTime)
        {
            base.Update(gameTime);
            particleEngine.EmitterLocation = Position;
            particleEngine.Update();
            ConstrainToEdges();
            Shooting = false;
        }

        public override void Move(GameTime gameTime)
        {
            base.Move(gameTime);

            if (Shooting)
            {
                if (Velocity.X > ActVelocity)
                {
                    Velocity.X = ActVelocity;
                }

                if (Velocity.X < -ActVelocity)
                {
                    Velocity.X = -ActVelocity;
                }

                if (Velocity.Y > ActVelocity)
                {
                    Velocity.Y = ActVelocity;
                }

                if (Velocity.Y < -ActVelocity)
                {
                    Velocity.Y = -ActVelocity;
                }
            }
        }

        public override void Magnetize(Ship ship, float distance, float angle)
        {
        }

        protected void ConstrainToEdges()
        {
            if (Position.X < 0)
            { 
                Position.X = 0;

                if (Velocity.X < 0)
                {
                    Velocity.X = 0;
                }
            }
            if (Position.X > game.GraphicsDevice.Viewport.Width)
            { 
                Position.X = game.GraphicsDevice.Viewport.Width;

                if (Velocity.X > 0)
                {
                    Velocity.X = 0;
                }
            }
            if (Position.Y < 0) 
            {
                Position.Y = 0;

                if (Velocity.Y < 0)
                {
                    Velocity.Y = 0;
                }
            }
            if (Position.Y > game.GraphicsDevice.Viewport.Height)
            {
                Position.Y = game.GraphicsDevice.Viewport.Height;

                if (Velocity.Y < 0)
                {
                    Velocity.Y = 0;
                }
            }
        }

        public override void Draw(SpriteBatch spriteBatch)
        {
            particleEngine.Draw(spriteBatch);
            base.Draw(spriteBatch);
        }
    }
}