Windows Phone 十八、加速计

加速度传感器

手机的加速度传感器工作时是通过 x、y、z 三个轴的偏移来计算的

在代码基本的 API 主要集中在 Accelerometer 类型中

主要是使用该类型的对象捕获 ReadingChanged 事件监视加速度值变化的

X、Y、Z 加速度传感值

    <StackPanel>
        <TextBox x:Name="txtX" Header="X:"/>
        <TextBox x:Name="txtY" Header="Y:"/>
        <TextBox x:Name="txtZ" Header="Z:"/>
    </StackPanel>

        protected override void OnNavigatedTo(NavigationEventArgs e)
        {
            // 先拿到传感器对象
            Accelerometer a = Accelerometer.GetDefault();
            if (a == null)
            {
                // 代表没有加速计传感器对象
                System.Diagnostics.Debug.WriteLine("没有加速计传感器");
                return;
            }
            a.ReadingChanged += a_ReadingChanged;
            a.ReportInterval = a.MinimumReportInterval * 5;
        }

        async void a_ReadingChanged(Accelerometer sender, AccelerometerReadingChangedEventArgs args)
        {
            System.Diagnostics.Debug.WriteLine(args + "改变了。。。");
            // 拿到变化值
            await this.Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, () =>
            {
                txtX.Text = args.Reading.AccelerationX.ToString();
                txtY.Text = args.Reading.AccelerationY.ToString();
                txtZ.Text = args.Reading.AccelerationZ.ToString();
            });
        }

平衡检测

    <Grid>

        <Path Data="M180.348,341.493 L144.279,392.488 L162.935,391.244 L161.692,630.05 L200.249,630.05 L196.517,392.488 L216.418,393.731 z" Fill="#FF6AEA00" HorizontalAlignment="Center" Height="289.557" Stretch="Fill" Stroke="Black" UseLayoutRounding="False" VerticalAlignment="Bottom" Width="73.139" RenderTransformOrigin="0.5,1">
            <Path.RenderTransform>
                <CompositeTransform x:Name="rotate" Rotation="0"/>
            </Path.RenderTransform>
        </Path>

    </Grid>

        protected override void OnNavigatedTo(NavigationEventArgs e)
        {
            DisplayInformation.AutoRotationPreferences = DisplayOrientations.Landscape;
            // 先拿到传感器对象
            Accelerometer a = Accelerometer.GetDefault();
            if (a == null)
            {
                // 代表没有加速计传感器对象
                System.Diagnostics.Debug.WriteLine("没有加速计传感器");
                return;
            }
            a.ReadingChanged += a_ReadingChanged;
            a.ReportInterval = a.MinimumReportInterval * 10;
        }

        async void a_ReadingChanged(Accelerometer sender, AccelerometerReadingChangedEventArgs args)
        {
            System.Diagnostics.Debug.WriteLine(args + "改变了。。。");
            // 拿到变化值
            await this.Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, () =>
            {
                rotate.Rotation = args.Reading.AccelerationY * 90;
            });
        }