public void DrawEndedGood(GameTime currentTime) // Winner screen
        {
            GraphicsDevice.Clear(Color.Black);

            spriteBatch.Begin();

            spriteBatch.Draw(Background, Vector2.Zero, Color.White);

            string FinalScore = String.Format("Final score = {0}", Score);

            Vector2 StringDimensions = Font1.MeasureString(FinalScore);

            int XPos = (900 - (int)StringDimensions.X) / 2;

            spriteBatch.DrawString(Font1, FinalScore, new Vector2(XPos, 250), Color.LimeGreen);

            StringDimensions = Font1.MeasureString("PRESS 'ESC' TO EXIT GAME");

            XPos = (900 - (int)StringDimensions.X) / 2;
            spriteBatch.DrawString(Font1, "PRESS 'ESC' TO EXIT GAME", new Vector2(XPos, 350), Color.LimeGreen);

            StringDimensions = Font2.MeasureString("YOU WIN");

            XPos = (900 - (int)StringDimensions.X) / 2;
            spriteBatch.DrawString(Font2, "YOU WIN", new Vector2(XPos, 140), Color.LimeGreen);

            StringDimensions = Font3.MeasureString("Free for public use Earth photo, credit: NASA");

            XPos = (900 - (int)StringDimensions.X) / 2;
            spriteBatch.DrawString(Font3, "Free for public use Earth photo, credit: NASA", new Vector2(XPos, 630), Color.White);

            spriteBatch.End();
        }
        public void DrawControls(GameTime currentTime) // Controls screen
        {
            GraphicsDevice.Clear(Color.Black);

            spriteBatch.Begin();

            spriteBatch.Draw(Background, Vector2.Zero, Color.White);

            Vector2 StringDimensions = Font1.MeasureString("LEFT ARROW KEY = MOVE LEFT");

            int XPos = (900 - (int)StringDimensions.X) / 2;

            spriteBatch.DrawString(Font1, "LEFT ARROW KEY = MOVE LEFT", new Vector2(XPos, 200), Color.LimeGreen);

            StringDimensions = Font1.MeasureString("RIGHT ARROW KEY = MOVE RIGHT");

            XPos = (900 - (int)StringDimensions.X) / 2;
            spriteBatch.DrawString(Font1, "RIGHT ARROW KEY = MOVE RIGHT", new Vector2(XPos, 250), Color.LimeGreen);

            StringDimensions = Font1.MeasureString("SPACEBAR = SHOOT");

            XPos = (900 - (int)StringDimensions.X) / 2;
            spriteBatch.DrawString(Font1, "SPACEBAR = SHOOT", new Vector2(XPos, 300), Color.LimeGreen);

            StringDimensions = Font2.MeasureString("CONTROLS");

            XPos = (900 - (int)StringDimensions.X) / 2;
            spriteBatch.DrawString(Font2, "CONTROLS", new Vector2(XPos, 90), Color.LimeGreen);

            StringDimensions = Font1.MeasureString("PRESS BACKSPACE TO RETURN TO START SCREEN");

            XPos = (900 - (int)StringDimensions.X) / 2;
            spriteBatch.DrawString(Font1, "PRESS BACKSPACE TO RETURN TO START SCREEN", new Vector2(XPos, 400), Color.LimeGreen);

            StringDimensions = Font3.MeasureString("Free for public use Earth photo, credit: NASA");

            XPos = (900 - (int)StringDimensions.X) / 2;
            spriteBatch.DrawString(Font3, "Free for public use Earth photo, credit: NASA", new Vector2(XPos, 630), Color.White);

            spriteBatch.End();
        }
        /// <summary>
        /// This is called when the game should draw itself.
        /// </summary>
        /// <param name="gameTime">Provides a snapshot of timing values.</param>

        // DRAWING CODE
        public void DrawStarted(GameTime gameTime) // Start screen
        {
            GraphicsDevice.Clear(Color.CornflowerBlue);

            spriteBatch.Begin();

            spriteBatch.Draw(Background, Vector2.Zero, Color.White);

            Vector2 StringDimensions = Font2.MeasureString("SPACE");

            int XPos = (900 - (int)StringDimensions.X) / 2;

            spriteBatch.DrawString(Font2, "SPACE", new Vector2(XPos, 100), Color.LimeGreen);

            StringDimensions = Font2.MeasureString("INVADERS");

            XPos = (900 - (int)StringDimensions.X) / 2;
            spriteBatch.DrawString(Font2, "INVADERS", new Vector2(XPos, 230), Color.LimeGreen);

            StringDimensions = Font1.MeasureString("PRESS ENTER TO START GAME");

            XPos = (900 - (int)StringDimensions.X) / 2;
            spriteBatch.DrawString(Font1, "PRESS ENTER TO START GAME", new Vector2(XPos, 350), Color.LimeGreen);

            StringDimensions = Font1.MeasureString("PRESS 'C' TO VIEW CONTROLS");

            XPos = (900 - (int)StringDimensions.X) / 2;
            spriteBatch.DrawString(Font1, "PRESS 'C' TO VIEW CONTROLS", new Vector2(XPos, 385), Color.LimeGreen);

            StringDimensions = Font3.MeasureString("Free for public use Earth photo, credit: NASA");

            XPos = (900 - (int)StringDimensions.X) / 2;
            spriteBatch.DrawString(Font3, "Free for public use Earth photo, credit: NASA", new Vector2(XPos, 630), Color.White);

            spriteBatch.End();
        }