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If the control events are not suitable for your requirements, you can use the low-level touch events to receive data from the touch screen. These are provided by Silverlight s Touch object, work along very similar lines to the TouchPanel object that we used for XNA input back in 4. The primary difference is the use of events as opposed to polling the object in the way we did in XNA. To subscribe to events from the Touch object, add a handler to its FrameReported event. An example of an event handler set to receive these events is shown in Listing 13 24.

Note If you need to build from source on Windows (a rare requirement), see the MySQL documentation s

The selected values are tested to see if the splash shape, which is SPLASH_SIZE units long in the x- and z- directions, extends off the map. If it does, the start point is moved back and/or to the left. The x- and z- indices are returned in a Point3i object. This is a convenient way of packaging up the integers; the point s y-value isn t used.

Listing 13 24. Setting up an event handler for the Touch.FrameReported event public MainPage() { InitializeComponent(); Touch.FrameReported += new TouchFrameEventHandler(Touch_FrameReported); } void Touch_FrameReported(object sender, TouchFrameEventArgs e) { // Event handler code goes here } The event will fire every time a new touch point is established, each time one of the touch points moves, and each time a touch point is released.

instructions for using VC++ to build the source, available from http://dev.mysql.com/doc/mysql/en/ Windows_source_build.html.

You can retrieve details of the interaction from the FrameReported event s TouchFrameEventArgs object The simplest way to obtain the data is to call its GetPrimaryTouchPoint function This function requires a relativeTo parameter just as the GetPosition function did in the mouse events earlier, and will return the touch point relative to the top-left corner of the specified element Once again, null can be passed to get the position as a screen coordinate There will always be a primary touch point when this event is fired, because the event is only triggered in response to a touch interaction of some description The object that is returned from this function is a TouchPoint object, which contains various readonly properties that we can use to find out about the touch.

Armed with a start point and the floor s heights map, createCoords() creates a heights map for the splash shape. The map is utilized to generate the geometry s vertices, which are ordered in the same way as the floor s vertices, in groups of four, representing groups of quads: private Point3f[] createCoords(Point3i startPt, float[][] heights) { // copy heights from the floor's heights map float[][] splashHeights = getSplashHeights(startPt, heights); Point3f[] coords = new Point3f[SPLASH_SIZE*SPLASH_SIZE*4]; // since each quad in the mesh has 4 coords int i = 0; for(int z=0; z <= SPLASH_SIZE-1; z++) { // skip z's front row for(int x=0; x <= SPLASH_SIZE-1; x++) { // skip x's right column createTile(coords, i, x, z, startPt, splashHeights); i = i + 4; // since 4 coords are needed for 1 quad }

Building MySQL from source is fairly straightforward on Unix-like platforms, especially if you ve compiled other software. Installation of the source tarball on a Unix system is similar to installing the binary tarball, with a few extra steps to configure and compile the MySQL binaries. Here are the steps: 1. Create the mysql group, which is used with the mysql user for controlling permissions of the files installed with MySQL, as well as the data files and logs. # groupadd mysql

The first of these is the Action property, which will contain one of the values Down (for a new touch point), Move (for an existing touch point) or Up (for a released touch point) The next property is the Position property, which returns a Point structure inside which the touch coordinate is contained, relative to the control specified in the call to GetPrimaryTouchPoint Finally we have the TouchDevice property This returns another object to us, from which we can query the Id of the touch point, and also the frontmost control underneath the touch point from the DirectlyOver property The DirectlyOver property returns a UIElement object if the touch point is over a control on the page, or null if it is not An example of a null return value is when the user drags a touch point up to the top of the screen and into the system tray.