3

我想在图像顶部放置一个静态矩形。

无论图像大小如何,矩形都应该是图像大小的百分比(如 80%)。

我试图将图像放在画布中并作为画布背景,但是我无法让图像填充周围区域。

<Canvas Grid.Row="1" Grid.Column="0">
    <Canvas.Background>
        <ImageBrush ImageSource="{Binding Path=Image1}"/>
    </Canvas.Background>
 </Canvas>
4

2 回答 2

4

将它放在一个网格中,然后将矩形放在同一行和同一列中。并使用转换器获得 80% 的大小。

XAML:

<Window.Resources>
    <local:RectangleSizeConverter x:Key="RectangleSizeConverter" />
</Window.Resources>
<Grid>
    <Grid.RowDefinitions>
        <RowDefinition Height="Auto" />
    </Grid.RowDefinitions>
    <Grid.ColumnDefinitions>
        <ColumnDefinition Width="Auto" />
    </Grid.ColumnDefinitions>
    <Image x:Name="image" Grid.Row="0" Grid.Column="0" Source="C:\on.jpg" />
    <Rectangle Height="{Binding ElementName=image, Path=ActualHeight, Converter={StaticResource RectangleSizeConverter}}" 
               Width="{Binding ElementName=image, Path=ActualWidth, Converter={StaticResource RectangleSizeConverter}}" 
               Fill="Red" Opacity=".5" />
</Grid>

C#(转换器):

public class RectangleSizeConverter : IValueConverter
{
    #region IValueConverter Members

    public object Convert(object value, System.Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        return System.Convert.ToDouble(value) * .8;
    }

    public object ConvertBack(object value, System.Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        throw new System.NotImplementedException();
    }

    #endregion
}
于 2009-10-13T15:06:38.993 回答
4

这是一种方法,您可以使用纯 XAML 使用 DrawingBrush 仅部分填充覆盖的 Rectangle:

<Grid>          
    <Grid.RowDefinitions>
        <RowDefinition Height="Auto" />
    </Grid.RowDefinitions>
    <Grid.ColumnDefinitions>
        <ColumnDefinition Width="Auto" />
    </Grid.ColumnDefinitions>
    <Image Source="http://sstatic.net/so/img/logo.png" Stretch="None" />
    <Rectangle>
        <Rectangle.Fill>
            <DrawingBrush Viewbox="0,0,1,1" ViewboxUnits="Absolute">
                <DrawingBrush.Drawing>
                    <GeometryDrawing Brush="#66FF0000">
                        <GeometryDrawing.Geometry>
                            <RectangleGeometry Rect="0,0,.9,.9" />
                        </GeometryDrawing.Geometry>
                    </GeometryDrawing>
                </DrawingBrush.Drawing>
            </DrawingBrush>
         </Rectangle.Fill>
     </Rectangle>
</Grid>
于 2009-10-14T13:55:37.577 回答