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// Put the meteor back to your initial position meteors[i].PutinStartPosition(); return true; } } return false; } /// <summary> /// Allows the GameComponent to draw your content in the game screen /// </summary> public override void Draw(GameTime gameTime) { // Draw the meteors for (int i = 0; i < meteors.Count; i++) { meteors[i].Draw(gameTime); } base.Draw(gameTime); } } } Observe that this class contains a great deal of the code that was previously inside the Game1 class in the previous chapter, but essentially it does the same thing. You ll use this class later to compose the action scene.

3. Run it with Ctrl+F5. You should see the same result as in Figure 8-3, for PopDataSet.cs. (Only the last ten rows are displayed.)

Instead of creating a dataset:

using System.Windows.Media.Imaging; using System.IO.IsolatedStorage; using System.IO; namespace IsolatedStorageStoreImageDemo {

Note Overall, it s a good idea to create a management class for each group of GameComponents in a game. It s normal to see classes such as EnemyManager, WizardManager, and so on, because this puts all the complexity of this type of game element in only one class. This simplifies the code and maximizes the reuse of these components in other games.

' Create dataset Dim ds As DataSet = New DataSet()

you created a data table:

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Another element you need to create for the action scene is the scoreboard. This scoreboard shows the quantity of points and energy of the player s ship. This class is simple: it only draws two lines of text on the screen. Add a class to the project called Score, and add the code in Listing 4-5.

' Create data table Dim dt As DataTable = New DataTable()

and instead of filling a dataset:

Listing 4-5. The Score GameComponent #region Using Statements using Microsoft.Xna.Framework; using Microsoft.Xna.Framework.Graphics; #endregion namespace RockRainEnhanced { /// <summary> /// This is a GameComponent that implements the game score /// </summary> public class Score : DrawableGameComponent { // SpriteBatch protected SpriteBatch spriteBatch = null; // Score position protected Vector2 position = new Vector2(); // Values protected int value; protected int power; protected readonly SpriteFont font; protected readonly Color fontColor; public Score(Game game, SpriteFont font, Color fontColor) : base(game) { this.font = font; this.fontColor = fontColor; // Get the current sprite batch spriteBatch = (SpriteBatch) Game.Services.GetService(typeof (SpriteBatch)); } /// <summary> /// Points value /// </summary>

' Fill dataset da.Fill(ds, "products")

Now add the following block of code to MainPage.xaml.cs to initialize the application s variables. public partial class MainPage : PhoneApplicationPage { private string ImageFileName = null; WebClient _webClient; // Used for downloading the image first time from the web site ...

you filled a data table:

public int Value { get { return value; } set { this.value = value; } } /// <summary> /// Power value /// </summary> public int Power { get { return power; } set { power = value; } } /// <summary> /// Position of component on screen /// </summary> public Vector2 Position { get { return position; } set { position = value; } } /// <summary> /// Allows the GameComponent to draw itself /// </summary> /// <param name="gameTime">Provides a snapshot of timing values</param> public override void Draw(GameTime gameTime) { string TextToDraw = string.Format("Score: {0}", value); // Draw the text shadow spriteBatch.DrawString(font, TextToDraw, new Vector2(position.X + 1, position.Y + 1), Color.Black); // Draw the text item spriteBatch.DrawString(font, TextToDraw, new Vector2(position.X, position.Y), fontColor); float height = font.MeasureString(TextToDraw).Y; TextToDraw = string.Format("Power: {0}", power); // Draw the text shadow spriteBatch.DrawString(font, TextToDraw, new Vector2(position.X + 1, position.Y + 1 + height), Color.Black);

' Fill data table da.Fill(dt)

Since a data table can hold only one table, notice that the Fill method doesn t accept the data table name as an argument. And, since you don t have to find a particular data table in a dataset, there was no need for

// Draw the text item spriteBatch.DrawString(font, TextToDraw, new Vector2(position.X, position.Y + 1 + height), fontColor); base.Draw(gameTime); } } } Again, this looks like the code in the previous version, only this time it is encapsulated in a class. Also, the text is now drawn with a little shadow under it, to enhance the legibility and give it a touch of style, as you did with the Menu component.

' Get table data Dim dt As DataTable = ds.Tables("products")

s Unless you really need to organize data tables in datasets so you can define relationships between Tip

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