使用Windows Phone 7芒果PhotoCamera的ViewFinder方向

问题描述

我在Windows Phone 7 Mango Beta 2开发工具中使用PhotoCamera控件。

I am using the PhotoCamera control with the Windows Phone 7 Mango Beta 2 development tools.

相机控件的ViewFinder是一个矩形对象， VideoBrush，如下例所示：

The "ViewFinder" for the camera control is a rectangle object filled with a VideoBrush, as in the example here:

我的问题是，当我在手机上运行应用程序时，ViewFinder图像总是逆时针旋转90度。

My problem is that when I run the app on my phone, the ViewFinder image is always showing up rotated 90 degrees counter-clockwise. This is the case no matter how the phone is positioned.

有没有人知道如何正确定位ViewFinder？

Does anyone know how I can orient the ViewFinder correctly?

推荐答案

是的，您需要使用相对变换来管理方向：

Yes, the orientation is something you'll need to manage with a Relative Transform:

<!--Camera viewfinder >-->
<Rectangle Grid.Row="1"
            x:Name="preview">
  <Rectangle.Fill>
    <VideoBrush x:Name="previewBrush">
      <VideoBrush.RelativeTransform>
        <CompositeTransform x:Name="previewTransform"
                            CenterX=".5"
                            CenterY=".5" />
      </VideoBrush.RelativeTransform>
    </VideoBrush>
  </Rectangle.Fill>
</Rectangle>

b
$ b

Then you can use the PhotoCamera class to determine how you want to rotate it:

double cameraRotation = theCamera.Orientation;

// Use the orientation to determine how to transform
// the camera preview
previewTransform.Rotation = theCamera.Orientation + 90.0; // Landscape?

HTH

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