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CHAPTER 6 WORKING WITH THE ACCELEROMETER
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Figure 6 10. CaptureAccelerometerData demo You will build the demo in three steps. First, you ll need to create a Visual Studio project. Next you will build the project s user interface, and then you ll finish up by adding the code the application needs to retrieve and display data from the accelerometer.
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Creating the CaptureAccelerometerData Project
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To set up the CaptureAccelerometerData project, follow the steps you ve used for previous examples in this book. 1. 2. Open Microsoft Visual Studio 2010 Express for Windows Phone on your workstation. Create a new Windows Phone Application by selecting File New Project on the Visual Studio command menu. Select the Windows Phone Application template, name the application CaptureAccelerometerData, and click OK. In order to use the accelerometer, add an assembly reference to Microsoft.Devices.Sensors by right-clicking the References folder in Solution Explorer and choose Microsoft.Devices.Sensors from the Add Reference window, as shown in Figure 6 11.
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CHAPTER 6 WORKING WITH THE ACCELEROMETER
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Figure 6 11. Adding a reference to Microsoft.Devices.Sensors
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Building the User Interface
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You will be building the user interface using the XAML in the Visual Studio. For building simple controls, it is faster to work with the XAML code. Go to Solution Explorer, open MainPage.xaml, and replace the XAML you find there with the following code.
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Declaring the UI Resources
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The namespaces you see in the following code snippet are typically declared by default when you first create a Windows Phone project. In particular, the namespaces xmlns:phone="clrnamespace:Microsoft.Phone.Controls; assembly=Microsoft.Phone" allow you to add common Windows Phone controls to the application main page. <phone:PhoneApplicationPage x:Class="CaptureAccelerometerData.MainPage" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:phone="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone" xmlns:shell="clr-namespace:Microsoft.Phone.Shell;assembly=Microsoft.Phone" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" FontFamily="{StaticResource PhoneFontFamilyNormal}" FontSize="{StaticResource PhoneFontSizeNormal}" Foreground="{StaticResource PhoneForegroundBrush}" SupportedOrientations="Portrait" Orientation="Portrait" mc:Ignorable="d" d:DesignWidth="480" d:DesignHeight="768" shell:SystemTray.IsVisible="True">
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CHAPTER 6 WORKING WITH THE ACCELEROMETER
Building the Main Page and Adding Components
Now create the components you need to display the x, y, z values, and the time reading that your application captures from the accelerometer. You ll also want to add components to display the pitch, roll, and theta values of the device, which you will calculate and use to understand how the phone is oriented. Finally, you also need buttons to start and to stop the accelerometer, which are also specified in this snippet. <Grid x:Name="LayoutRoot" Background="Transparent"> <Grid.RowDefinitions> <RowDefinition Height="Auto"/> <RowDefinition Height="*"/> </Grid.RowDefinitions> <StackPanel x:Name="TitlePanel" Grid.Row="0" Margin="24,24,0,12"> <TextBlock x:Name="ApplicationTitle" Text="CaptureAccelerometer Data" Style="{StaticResource PhoneTextNormalStyle}"/> </StackPanel> <Grid x:Name="ContentGrid" Grid.Row="1"> <TextBlock Name="txtX" Text="TextBlock" Margin="160,56,12,0" FontSize="20" Height="31" VerticalAlignment="Top" /> <TextBlock Name="txtY" Text="TextBlock" Margin="160,119,12,556" FontSize="20" /> <TextBlock Name="txtZ" Text="TextBlock" Margin="155,181,12,490" FontSize="20" /> <TextBlock Name="txtTime" Text="TextBlock" Margin="155,244,12,427" FontSize="20" /> <Button Content="Start" Height="72" Name="btnStart" Width="160" Margin="36,514,284,119" Click="btnStart_Click" /> <Button Content="Stop" Height="72" Name="btnStop" Width="160" Margin="207,514,113,119" Click="btnStop_Click" /> <TextBlock FontSize="40" Margin="66,34,331,614" Name="lblX" Text="X" /> <TextBlock FontSize="40" Margin="66,97,331,552" Name="lblY" Text="Y" /> <TextBlock FontSize="40" Margin="66,159,346,489" Name="lblZ" Text="Z" /> <TextBlock FontSize="40" Margin="12,222,331,422" Name="lblTime" Text="Time" /> <TextBlock FontSize="20" Margin="160,285,7,386" Name="txtPitch" Text="TextBlock" /> <TextBlock FontSize="22" Margin="0,283,370,365" Name="textBlock3" Text="Pitch" TextAlignment="Right" /> <TextBlock FontSize="20" Margin="160,345,7,326" Name="txtRoll" Text="TextBlock" /> <TextBlock FontSize="22" Margin="0,343,370,305" Name="textBlock4" Text="Roll" TextAlignment="Right" />
CHAPTER 6 WORKING WITH THE ACCELEROMETER
<TextBlock FontSize="20" Margin="160,408,7,263" Name="txtTheta" Text="TextBlock" /> <TextBlock FontSize="22" Margin="0,406,370,242" Name="textBlock6" Text="Theta" TextAlignment="Right" /> </Grid> </phone:PhoneApplicationPage> Once you have loaded the XAML code, you should see the layout shown in Figure 6 12. In the next section, you will be adding events to the updating of the UI with captured accelerometer data.
Figure 6 12. CaptureAccelerometerData demo design view
Coding the Application
In Solution Explorer, open MainPage.xaml.cs and replace the code there with the following C# code blocks that will implement the UI updates using accelerometer data.
CHAPTER 6 WORKING WITH THE ACCELEROMETER
Specifying the Namespaces
Begin by listing the namespaces the application will use. Notice our inclusion of Microsoft.Devices.Sensors that will allow you to start and stop Windows Phone s accelerometer. using System; using System.Windows; using Microsoft.Phone.Controls; using Microsoft.Devices.Sensors; namespace CaptureAccelerometerData { public partial class MainPage : PhoneApplicationPage {
Initializing Variables
The variable _ac, an Accelerometer object, will be used to start and stop, and retrieve x, y, z and time. Also notice the inclusion of the ReadingChanged event, which you ll draw on to send captured accelerometer data to your UI. Accelerometer _ac; public MainPage() { InitializeComponent(); _ac = new Accelerometer(); _ac.ReadingChanged += new EventHandler<AccelerometerReadingEventArgs>(_ac_ReadingChanged); }
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