对于圆角矩形,您可以在 XAML 中使用角的径向渐变和边的线性渐变来完成这一切。
该示例使用 ViewBox,因此不需要在网格及其剪辑路径上设置“大小”。如果您需要调整大小并保持相同的边框半径,您可以绑定 RectangleGeometry.Rect 并使用 ValueConverter。渐变以及 RadiusX 和 RadiusY 属性可以在一处轻松更改。
<Viewbox Stretch="Fill">
<Grid Width="100" Height="100">
<Grid.Resources>
<Color x:Key="inside">White</Color>
<GradientStopCollection x:Key="gradient">
<GradientStop Color="Black" Offset="1"/>
<GradientStop Color="{DynamicResource inside}" Offset="0.2"/>
</GradientStopCollection>
</Grid.Resources>
<Grid.Clip>
<RectangleGeometry RadiusX="15" RadiusY="30" Rect="0,0,100,100" x:Name="clip" />
</Grid.Clip>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="{Binding RadiusX, ElementName=clip}" />
<ColumnDefinition Width="1*"/>
<ColumnDefinition Width="{Binding RadiusX, ElementName=clip}" />
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="{Binding RadiusY, ElementName=clip}"/>
<RowDefinition Height="1*"/>
<RowDefinition Height="{Binding RadiusY, ElementName=clip}"/>
</Grid.RowDefinitions>
<Rectangle Grid.Column="1" Margin="-1,0">
<Rectangle.Fill>
<LinearGradientBrush EndPoint="0,0" MappingMode="RelativeToBoundingBox" StartPoint="0,1" GradientStops="{DynamicResource gradient}" />
</Rectangle.Fill>
</Rectangle>
<Rectangle Grid.Column="2" Grid.Row="1" Margin="0,-1">
<Rectangle.Fill>
<LinearGradientBrush EndPoint="1,0" MappingMode="RelativeToBoundingBox" StartPoint="0,0" GradientStops="{DynamicResource gradient}" />
</Rectangle.Fill>
</Rectangle>
<Rectangle Grid.Column="1" Grid.Row="2" Margin="-1,0">
<Rectangle.Fill>
<LinearGradientBrush EndPoint="0.5,1" MappingMode="RelativeToBoundingBox" StartPoint="0.5,0" GradientStops="{DynamicResource gradient}" />
</Rectangle.Fill>
</Rectangle>
<Rectangle Grid.Row="1" Margin="0,-1">
<Rectangle.Fill>
<LinearGradientBrush EndPoint="0,0" MappingMode="RelativeToBoundingBox" StartPoint="1,0" GradientStops="{DynamicResource gradient}" />
</Rectangle.Fill>
</Rectangle>
<Rectangle Grid.Column="1" Grid.Row="1" Margin="-1">
<Rectangle.Fill>
<SolidColorBrush Color="{DynamicResource inside}" />
</Rectangle.Fill>
</Rectangle>
<Rectangle>
<Rectangle.Fill>
<RadialGradientBrush Center="1,1" RadiusX="1" RadiusY="1" GradientOrigin="1,1" GradientStops="{DynamicResource gradient}" />
</Rectangle.Fill>
</Rectangle>
<Rectangle Grid.Column="2">
<Rectangle.Fill>
<RadialGradientBrush Center="0,1" RadiusX="1" RadiusY="1" GradientOrigin="0,1" GradientStops="{DynamicResource gradient}" />
</Rectangle.Fill>
</Rectangle>
<Rectangle Grid.Column="2" Grid.Row="2">
<Rectangle.Fill>
<RadialGradientBrush Center="0,0" RadiusX="1" RadiusY="1" GradientOrigin="0,0" GradientStops="{DynamicResource gradient}" />
</Rectangle.Fill>
</Rectangle>
<Rectangle Grid.Row="2">
<Rectangle.Fill>
<RadialGradientBrush Center="1,0" RadiusX="1" RadiusY="1" GradientOrigin="1,0" GradientStops="{DynamicResource gradient}" />
</Rectangle.Fill>
</Rectangle>
</Grid>
</Viewbox>
如果您需要渐变来遵循更复杂的形状,您可以使用 V3.0 PixelShader 来完成。