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To detect touch and gestures using the XNA Framework classes, you must do the following: Add a reference to the assemblies Microsoft.Xna.Framework and Microsoft.Xna.Framework.Input.Touch to your project. Set the properties of the static TouchPanel class to specify the types of gestures you want to capture. Start a DispatcherTimer that will raise an event at appropriate intervals. Handle the event raised by the DispatcherTimer to obtain the gesture information. The following code example specifies that the TouchPanel will collect all gestures except for horizontal drag and vertical drag (which constrain the results in one direction). It then creates a Dispatcher Timer with an interval of 50 milliseconds, though you can vary this depending on how often you want to read gesture information, adds the event handler, and starts the timer. To use this code, you must reference the namespace System.Windows.Threading.
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C# TouchPanel.DisplayHeight = 800; TouchPanel.DisplayWidth = 480; TouchPanel.EnabledGestures = GestureType.Tap | GestureType.DoubleTap | GestureType.Hold | GestureType.FreeDrag | GestureType.Flick | GestureType.Pinch; var touchTimer = new DispatcherTimer(); touchTimer.Interval = TimeSpan.FromMilliseconds(50); touchTimer.Tick += new EventHandler(Read_Gestures); touchTimer.Start();
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In the event raised by the timer, you can read each gesture. However, each gesture will consist of several individual components; for example, a double tap will result in detection of both a tap and a double tap gesture, so your code must examine the sequence of gestures to determine what action to take. The following code example of a gesture detection event handler shows how you obtain information about each gesture that was detected. It indicates the values that are available for each of the gesture types. Remember that the event handler runs on a different thread from the UI, so you must invoke a method on the UI thread if you want to update the UI with the discovered values.
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void Read_Gestures(object sender, EventArgs e) xCoordinate = 0; yCoordinate = 0; xStartCoordinate = 0; yStartCoordinate = 0; xEndCoordinate = 0; yEndCoordinate = 0; xSecondFingerStartCoordinate ySecondFingerStartCoordinate xSecondFingerEndCoordinate = ySecondFingerEndCoordinate = xFlickSpeed = 0; yFlickSpeed = 0;
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while (TouchPanel.IsGestureAvailable) { GestureSample gesture = TouchPanel.ReadGesture(); switch (gesture.GestureType) { case GestureType.Tap: xCoordinate = gesture.Position.X; yCoordinate = gesture.Position.Y; break; case GestureType.DoubleTap: xCoordinate = gesture.Position.X; yCoordinate = gesture.Position.Y; break; case GestureType.Hold: xCoordinate = gesture.Position.X; yCoordinate = gesture.Position.Y; break; case GestureType.FreeDrag: xEndCoordinate = gesture.Position.X; yEndCoordinate = gesture.Position.Y; xStartCoordinate = xEndCoordinate - gesture.Delta.X; yStartCoordinate = yEndCoordinate - gesture.Delta.Y; // For GestureType.HorizontalDrag, Delta.Y // will always be zero. // For GestureType.VerticalDrag, Delta.X // will always be zero. break; case GestureType.Flick:
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xFlickSpeed = gesture.Delta.X; // pixels per second yFlickSpeed = gesture.Delta.Y; // pixels per second break; case GestureType.Pinch: xEndCoordinate = gesture.Position.X; yEndCoordinate = gesture.Position.Y; xStartCoordinate = xEndCoordinate - gesture.Delta.X; yStartCoordinate = yEndCoordinate - gesture.Delta.Y; xSecondFingerStartCoordinate = gesture.Position2.X; ySecondFingerStartCoordinate = gesture.Position2.Y; xSecondFingerEndCoordinate = xSecondFingerStartCoordinate - gesture.Delta2.X; ySecondFingerEndCoordinate = ySecondFingerStartCoordinate - gesture.Delta2.Y; break; } } }
For more information about using XNA to detect gestures, see Working with Touch Input (Windows Phone) on MSDN (http:// msdn.microsoft.com/en-us/library/ff434208.aspx).
Vibration Alerts
Application code can initiate the vibration capability of the device to alert users of events occurring in the application. To use this feature, you must do the following: Add a reference to the namespace Microsoft.Devices to your class. Call the static methods of the default VibrateController class to start and stop vibration. To initiate vibration for the default duration, call the Start method. To specify the duration, include a TimeSpan that defines the duration of the vibration as the parameter of the Start method. To stop vibration, call the Stop method.
C# VibrateController.Default.Start(); // Default duration VibrateController.Default.Start(TimeSpan.FromSeconds(2)); VibrateController.Default.Stop();
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Web Browser
You can invoke the Windows Phone 7 web browser in your applications using the WebBrowserTask class. You simply specify the URL to open, and call the Show method. The following code example shows how to do this.
C# WebBrowserTask browserTask = new WebBrowserTask(); browserTask.URL = "http://www.microsoft.com/windowsmobile"; browserTask.Show();
For more information, see WebBrowserTask Class on MSDN (http://msdn.microsoft.com/en-us/library/microsoft.phone.tasks. webbrowsertask(VS.92).aspx).
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