Question

任何人都可以解释为什么Stretch在Ellipse元素中无效。无论我使用None，Fill，UniformToFill还是Uniform，结果始终是相同的。

如果我在DataTemplate（GridView）中使用相同的代码，那么它将正常工作。

<Button x:Name="UI_Application_LogIn_ProfilePictureButton_Button" Style="{StaticResource LogInButton}" BorderBrush="{ThemeResource SystemControlForegroundBaseMediumBrush}" IsTabStop="False" UseSystemFocusVisuals="False">
    <Grid x:Name="UI_Application_LogIn_ProfilePicture_Grid" IsHitTestVisible="False">
        <Ellipse x:Name="UI_Application_LogIn_ProfilePicture" Width="160" Height="160">
            <Ellipse.Fill>
                <ImageBrush x:Name="UI_Application_LogIn_ProfilePictureImageBrush" Stretch="UniformToFill" AlignmentY="Top"/>
            </Ellipse.Fill>
        </Ellipse>
        <Ellipse x:Name="UI_Application_LogIn_ProfilePictureNonStaticLightEffect" Width="160" Height="160" Fill="{ThemeResource SystemControlHighlightTransparentRevealBorderBrush}"/>
    </Grid>
</Button>

Answer 1

如果您想创建一个四舍五入的图像，请使用 windows社区工具包

中的Imagex控件

您可以查找并使用imagex here进行游戏或者您可以通过 Microsoft.Toolkit.Uwp.UI.Controls 上的nuget引用您的应用程序对于您当前的问题，这是因为拉伸仅会影响日食内部的笔刷，而不会影响日食本身，因此为了进行比例调整，您必须将日食包裹在 Viewbox 上控件，然后以与在图像上相同的方式设置其 Stretch 属性

Answer 2

我发现了拉伸无效的原因。真的是脑子屁。创建新的ImageBrush时，我忘记在代码中使用Stretch。因此，在创建新的ImageBrush之后添加行if (BrushStretch != null) (TargetShape.Fill as ImageBrush).Stretch = BrushStretch.Value;可以解决此问题。

    //STORAGE FILE TO SHAPE
    public static async Task<Shape> StorageFileToShape(Shape TargetShape, StorageFile SourceStorageFile, Stretch? BrushStretch, AlignmentX? BrushAlignmentX, AlignmentY? BrushAlignmentY)
    {
        //IF SHAPE NULL RETURN NULL
        if (TargetShape == null) return null;
        //IF STORAGEFILE NULL OR NOT AVAILABLE RETURN NULL
        if (SourceStorageFile == null || !SourceStorageFile.IsAvailable) return null;
        //IF BRUSH IS NULL OR ITS TYPE ISN'T 'ImageBrush' CREATE NEW BRUSH
        if (TargetShape.Fill == null || TargetShape.Fill.GetType() != typeof(ImageBrush)) TargetShape.Fill = new ImageBrush();
        //SET STRETCH
        if (BrushStretch != null) (TargetShape.Fill as ImageBrush).Stretch = BrushStretch.Value;
        //SET ALIGNMENT X
        if (BrushAlignmentX != null) (TargetShape.Fill as ImageBrush).AlignmentX = BrushAlignmentX.Value;
        //SET ALIGNMENT Y
        if (BrushAlignmentY != null) (TargetShape.Fill as ImageBrush).AlignmentY = BrushAlignmentY.Value;
        //GET PICTURE 
        (TargetShape.Fill as ImageBrush).ImageSource = await StorageFileToBitmapImage(SourceStorageFile);
        //SET SHAPE FILL
        TargetShape.Fill = TargetShape.Fill as ImageBrush;
        //RETURN SHAPE
        return TargetShape;
    }
    //STORAGE FILE TO BITMAP IMAGE
    public static async Task<BitmapImage> StorageFileToBitmapImage(StorageFile SourceStorageFile)
    {
        BitmapImage TargetBitmapImage = new BitmapImage();
        TargetBitmapImage.CreateOptions = BitmapCreateOptions.IgnoreImageCache;
        using (var BitmapImageFileStream = await SourceStorageFile.OpenAsync(FileAccessMode.Read))
        {
            await TargetBitmapImage.SetSourceAsync(BitmapImageFileStream);
        }
        return TargetBitmapImage;
    }

椭圆拉伸无效

2 个答案: