Windows Phone 十八、羅盤

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磁力計概述

擁有磁力計硬體支援的裝置可以根據磁力計來確定相對於北極的角度

磁力計的訪問 API 定義在 Compass 類中

調用方式和加速計類似

1     <Grid Background="White">2         <Image Source="compass.png" RenderTransformOrigin="0.5,0.5">3             <Image.RenderTransform>4                 <CompositeTransform x:Name="rotate" Rotation="1"/>5             </Image.RenderTransform>6         </Image>7     </Grid>

 1         protected override void OnNavigatedTo(NavigationEventArgs e) 2         { 3             Compass c = Compass.GetDefault(); 4             if (c == null) 5             { 6                 // 不支援羅盤 7                 return; 8             } 9             c.ReadingChanged += async (p1, p2) =>10             {11                 // 修改圖片的旋轉角度；12                 System.Diagnostics.Debug.WriteLine(p2.Reading.HeadingTrueNorth.Value);13                 await this.Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, () =>14                 {15                     rotate.Rotation = -p2.Reading.HeadingTrueNorth.Value;16                 });17             };18             c.ReportInterval = c.MinimumReportInterval * 10;19         }

 

Windows Phone 十八、羅盤