WP利用Accelerometer类制作加速度测量器。

来源：互联网发布：常用linux命令编辑：程序博客网时间：2024/04/28 02:36

MainPage.xaml中部分代码：

<Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0">           <TextBlock VerticalAlignment="Top" Text="x:" Name="XLabel" Style="{StaticResource PhoneTextNormalStyle}" Margin="42,124,386,0"></TextBlock>           <TextBlock VerticalAlignment="Top" Text=" " Name="XTextBlock" Style="{StaticResource PhoneTextExtraLargeStyle}" Margin="86,100,20,0" Foreground="{StaticResource PhoneAccentBrush}"></TextBlock>           <TextBlock VerticalAlignment="Top" Text="y:" Name="YLabel" Style="{StaticResource PhoneTextNormalStyle}" Margin="42,236,386,0"></TextBlock>           <TextBlock VerticalAlignment="Top" Text=" " Name="YTextBlock" Style="{StaticResource PhoneTextExtraLargeStyle}" Margin="86,212,52,0" Foreground="{StaticResource PhoneAccentBrush}"></TextBlock>           <TextBlock VerticalAlignment="Top" Text="z:" Name="ZLabel" Style="{StaticResource PhoneTextNormalStyle}" Margin="42,332,386,0"></TextBlock>           <TextBlock VerticalAlignment="Top" Text=" " Name="ZTextBlock" Style="{StaticResource PhoneTextExtraLargeStyle}" Margin="86,308,54,0"  Foreground="{StaticResource PhoneAccentBrush}"></TextBlock>           <TextBlock VerticalAlignment="Top" Text="Total:" Name="TotalLabel" Style="{StaticResource PhoneTextNormalStyle}" Margin="24,420,386,0"></TextBlock>           <TextBlock VerticalAlignment="Top" Text=" " Name="TotalTextBlock" Style="{StaticResource PhoneTextExtraLargeStyle}" Margin="86,400,54,0"  Foreground="{StaticResource PhoneAccentBrush}"></TextBlock>           <TextBlock VerticalAlignment="Top" Text="status:" Name="statusLabel" Style="{StaticResource PhoneTextNormalStyle}" Margin="24,11,0,0" HorizontalAlignment="Left" Width="72" />           <TextBlock VerticalAlignment="Top" Text="accelerometer stopped" Name="statusTextBlock" Style="{StaticResource PhoneTextNormalStyle}" Foreground="{StaticResource PhoneAccentBrush}" Margin="102,11,6,0" />                    </Grid>

MainPage.cs中部分代码:

建立一个Accelerometer对象accelerometer：

Accelerometer accelerometer;

在mainpage的构造函数添加一个applicationBar并为之添加一个控制加速器开关的按钮：

public MainPage()        {            InitializeComponent();              ApplicationBar = new ApplicationBar();            ApplicationBar.IsVisible = true;              ApplicationBarIconButton startStopButton = new ApplicationBarIconButton(new Uri("/Images/startstop.png", UriKind.Relative));            startStopButton.Text = "on/off";            startStopButton.Click += new EventHandler(startStopButton_Click);            ApplicationBar.Buttons.Add(startStopButton);        }

为按钮添加事件处理函数：（强调一下，在老版本中ReadingChanged事件是加速度器数值改变时执行的事件，而新版本已改用CurrentValueChanged事件，因此我用了CurrentValueChanged事件处理）。

void startStopButton_Click(object sender, EventArgs e)        {            // 构造并开始            if (accelerometer == null)            {                accelerometer = new Accelerometer();                  //老版本加速度改变事件                //accelerometer.ReadingChanged += new EventHandler<AccelerometerReadingEventArgs>(accelerometer_ReadingChanged);                //wp8加速度改变事件                accelerometer.CurrentValueChanged += accelerometer_CurrentValueChanged;                                  try                {                    statusTextBlock.Text = "starting accelerometer";                    accelerometer.Start();                }                catch (AccelerometerFailedException exception)                {                    statusTextBlock.Text = "error starting accelerometer";                }            }            else            {                try                {                    accelerometer.Stop();                    accelerometer = null;                    statusTextBlock.Text = "accelerometer stopped";                }                catch (AccelerometerFailedException exception)                {                    statusTextBlock.Text = "error stopping accelerometer";                }              }        }

实现委托函数，这里设计到UI线程访问问题，在此不做过多解释。

void accelerometer_CurrentValueChanged(object sender, SensorReadingEventArgs<AccelerometerReading> e)       {           Deployment.Current.Dispatcher.BeginInvoke(() => ChangeUI(e));       }

完成ChangeUI函数（这里记得要引用程序集Microsoft.Xna.Framework）：

void ChangeUI(SensorReadingEventArgs<AccelerometerReading> e)        {            if (accelerometer != null)            {                statusTextBlock.Text = accelerometer.State.ToString();                Vector3 v3 = e.SensorReading.Acceleration;                                    XTextBlock.Text = v3.X.ToString("0.00");                YTextBlock.Text = v3.Y.ToString("0.00");                ZTextBlock.Text = v3.Z.ToString("0.00");                    TotalTextBlock.Text = v3.Length().ToString();            }        }

ok，加速度器完成。

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