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And here s your technique definition: technique DeferredSpotLight { pass Pass0 { VertexShader = compile vs_2_0 MyVertexShader(); PixelShader = compile ps_2_0 MyPixelShader(); } } You have created an effect that starts from a depth map, a normal map, and a spotlight and creates a shading map containing the influence of the spotlight on the part of your scene that is visible to your camera. XNA Code In your XNA code, you will call this effect for each of the lights present in your scene. To manage your lights, create this struct, which can hold all the details about one spotlight: public struct SpotLight { public Vector3 Position; public float Strength; public Vector3 Direction; public float ConeAngle; public float ConeDecay; } Add an array of these objects to your project: SpotLight[] spotLights; And initialize it so it can store some lights: spotLights = new SpotLight[NumberOfLights]; Now it s entirely up to you to define each of the spotlights. Even more, you can change their settings in the Update method so they will move around your scene! Next, you will create a method that accepts a SpotLight object. The method will render the lighting contributions of this spotlight onto the render target: private void AddLight(SpotLight spotLight) { effect2Lights.CurrentTechnique = effect2Lights.Techniques["DeferredSpotLight"]; effect2Lights.Parameters["xNormalMap"].SetValue(normalMap); effect2Lights.Parameters["xDepthMap"].SetValue(depthMap); effect2Lights.Parameters["xLightPosition"].SetValue(spotLight.Position); effect2Lights.Parameters["xLightStrength"].SetValue(spotLight.Strength); effect2Lights.Parameters["xConeDirection"].SetValue(spotLight.Direction);

public class LogCurrentTime { public void Subscribe(Clock theClock) { theClock.SecondChanged += new Clock.SecondChangeHandler(WriteLogEntry); } public void WriteLogEntry(object theClock, TimeInfoEventArgs ti) { Console.WriteLine("Logging to file: {0}:{1}:{2}", ti.hour.ToString( ), ti.minute.ToString( ), ti.second.ToString( )); } }

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Before CLR Integration, the state of database programming was less than ideal T-SQL works great for set-oriented tasks, but it is difficult to work with and slow for procedural tasks NET languages can provide the necessary procedural logic, but only at the expense of marshaling the data in and out of the SQL Server database CLR Integration provides an elegant solution to this problem SQL Server 2005 can host the CLR and, therefore, can execute managed code in process This provides the following benefits: Instead of struggling with the limited procedural constructs of T-SQL, database developers can take advantage of all the capabilities of a managed NET language such as C# or VB NET These languages provide modern procedural and object-oriented features, making it much easier to develop and reuse complex procedural logic The JIT compilation scheme these languages employ also performs much better than T-SQL interpretation.

A lot more GDI+ drawing features are included in .NET, but what we ve seen here should be enough to whet your appetite. You can do a lot of fancy drawing with GDI+, but let s face it: you and I are programmers, not artists. If we were artists, we d be raking in six figures using a floor mop to draw traditional abstract cubist Italian landscapes with Bauhausian accents. Fortunately, there are practical semi-artistic things you can do with GDI+. One important drawing feature is owner draw, a sharing of drawing responsibilities between a control and you, the programmer. (You are the owner. ) The ComboBox control supports owner drawing of the individual items in the drop-down portion of the list. Let s create a ComboBox control that displays color names, including a small sample of the color to the left of the name. Create a new Windows Forms application, and add a ComboBox control named ComboBox1 to Form1. Make these changes to ComboBox1: 1. Change its DropDownStyle property to DropDownList. 2. Change its DrawMode property to OwnerDrawFixed. 3. Alter its Items property, adding multiple color names as distinct text lines in the String Collection Editor window. I added Red, Green, and Blue. Now, add the following code to the source code area of Form1 s class:

We included the setter methods in table 9.4 to keep the methods all in one place, but you ll usually only be using the setters if you re working with the Address Book framework, not the Address Book UI framework. Here s how they work:

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