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their own OnPaint() methods. In 24, you ll see an example of a custom drawing program that demonstrates both the control-based approach and a pure GDI+ approach to drawing shape elements.

Listing 10-2. Using the stereo_pan Function tank.explode() # Do explosion visual explosion_channel = explosion_sound.play() if explosion_channel is not None: left, right = stereo_pan(tank.position.x, SCREEN_SIZE[0]) explosion_channel.set_volume(left, right)

string _sql = "SELECT INFO FROM PRODUCT_EXTRAINFO";

The square painting program shown earlier presents some interesting possibilities. For example, you could use this code as the basis for a simple GDI+ drawing application. You probably would add controls that allow the user to draw more than one type of object. You would need to add a special class (perhaps called Shape) that encapsulates all the details about the drawn

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object, such as size, color, pen width, and so on. Your Paint event handler would then iterate through a collection of Shape objects and render all of them to the form using the appropriate information. All these details are easy to implement, but what if you want to go another step and give the user the ability to select and manipulate shapes after they ve been created You ll need a way to respond to mouse actions and determine what shape the user is trying to select. Unfortunately, squares, ellipses, curves, and other shapes have no ability to capture mouse actions and raise the typical MouseDown and Click events. Instead, you need to intercept these events using the containing object (typically a form), and then manually determine whether a shape was clicked. This process is known as hit testing.

OracleCommand _cmdObj = new OracleCommand(_sql, _connObj); OracleDataReader _rdrObj = _cmdObj.ExecuteReader (); OracleXmlType _oracleXmlType = _rdrObj.GetOracleXmlType(_rdrObj.GetOrdinal("INFO")); The OracleXmlType class contains a set of useful methods, such as the ability to extract individual elements from the XML without the need to create an XMLDocument object, or to check if an element is present in the XML. Let s take a look at some of these functions in Table 10-1. Table 10-1. Useful Methods and Properties in the OracleXmlType Class

.NET provides basic hit testing support through a Contains() method that s built into the Rectangle structure. It examines a supplied x and y coordinate, Point object, or Rectangle object, and returns True if it is located inside the Rectangle. However, there are a couple of quirks that take some getting used to with Rectangle hit testing: A Rectangle is a combination of points (defined by a top-left corner, width, and height). It doesn t necessarily correspond to a region on the screen that depends on whether you ve drawn some sort of shape based on the Rectangle with one of the GDI+ drawing methods. The Rectangle is the only simple drawing structure that supports hit testing. That means that if you create another shape (like an ellipse), you need to convert its coordinates into a Rectangle object or use the GraphicsPath approach (described in the next section).

Generally it is best to leave the task of selecting a channel to Pygame, but it is possible to force a Sound object to play through a particular channel by calling the play method of the Channel object, which takes the sound you want to play followed by the number of times you want it to repeat and the maximum time you want it to play. One reason to do this is to reserve one or more channels for high-priority sounds. For instance, you might not want background ambient noise to block the player s gunfire. To reserve a number of channels, call the pygame.mixer.set_reserved function, which prevents a number of channels from being considered by the Sound.play method. For instance, if you call pygame.mixer.set_serserved(2), Pygame will not select channel 0 or 1 when calling play from a Sound object. Listing 10-3 shows how to reserve the first two channels. Listing 10-3. Reserving Channels pygame.mixer.set_reserved(2) reserved_channel_0 = pygame.mixer.Channel(0) reserved_channel_1 = pygame.mixer.Channel(1) Here s how you would force a sound to be played through one of the reserved channels: reserved_channel_1.play(gunfire_sound) See Table 10-2 for a complete list of the methods of Channel objects. Table 10-2. Methods of Channel Objects

Tip The Rectangle also provides methods that aren t considered here. For example, you can use Intersect()

IsExists(xpathExpr, nsMap)

to return a Rectangle representing where two Rectangles intersect, Offset() to move it, and Inflate() to enlarge or reduce it.

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