在Windows Phone的8.1之前保存图像旋转 [英] Rotate image before saving in Windows Phone 8.1

问题描述

我的应用应当从相机保存图像。我写了下面的代码：

My app should save an image from camera. I wrote the code below:

1. 方法，它初始化相机。

1. Method which initializes the camera.

Windows.Media.Capture.MediaCapture takePhotoManager;
public async void InitializeCamera()
{
    takePhotoManager = new Windows.Media.Capture.MediaCapture();

    await takePhotoManager.InitializeAsync();
    takePhotoManager.SetPreviewRotation(VideoRotation.Clockwise90Degrees);
    PhotoPreview.Source = takePhotoManager;
    await takePhotoManager.StartPreviewAsync();
    // to stop it
    //await takePhotoManager.StopPreviewAsync();
}

方法既节约了一张照片：

Method which saves a photo:

public async void SavePhoto()
{
    ImageEncodingProperties imgFormat = ImageEncodingProperties.CreateJpeg();

    var file = await KnownFolders.PicturesLibrary.CreateFileAsync("Photo.jpg", CreationCollisionOption.ReplaceExisting);

    await takePhotoManager.CapturePhotoToStorageFileAsync(imgFormat, file);
}

预览

Preview

    <CaptureElement x:Name="PhotoPreview" FlowDirection="LeftToRight"
        HorizontalAlignment="Center" 
        VerticalAlignment="Center" 
        Stretch="UniformToFill">
    </CaptureElement>

我有两个问题：
1.预览不会填满整个空间

I have two problems: 1. The preview does not fill the entire space

1. 保存我得到这样的事情后。（不旋转和两侧的透明层）结果
   

感谢

推荐答案

我觉得问题可能出在您所使用的面板。正如我无法看到的 Grid.Row 的财产您的 CaptureElement 的XAML中那么我怀疑你正在使用的的StackPanel 的 - 那就是赢得了面板'T延伸到你的屏幕，它只是堆栈的元素。

I think the problem may be in the panel you are using. As I can't see Grid.Row property in your CaptureElement in XAML then I suspect that you are using StackPanel - it's a panel that won't stretch to your screen it just stacks elements.

您正在尝试做的事情有可能需要的电网的，因为我检查下面的代码应该工作：

The thing you are trying to do should be possible with Grid, as I've checked the following code should work:

<Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
    <Grid.RowDefinitions>
        <RowDefinition Height="Auto"/>
        <RowDefinition Height="*"/>
    </Grid.RowDefinitions>

    <StackPanel Orientation="Vertical" Grid.Row="0">
        <Button Click="InitCameraBtn_Click" Content="Initialize Camera" />
        <Button Click="StartPreviewBtn_Click" Content="Start Capture Preview" />
        <Button Click="StopPreviewBtn_Click" Content="Stop Capture Preview" />
    </StackPanel>

    <CaptureElement x:Name="PhotoPreview" Stretch="UniformToFill" Grid.Row="1" VerticalAlignment="Center" HorizontalAlignment="Center"/>
</Grid>

这篇关于在Windows Phone的8.1之前保存图像旋转的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！