WPF圆角 - 是否可能在角落周围创建一致的渐变？

Question

我在Expression Blend中创建了一个我非常喜欢的渐变效果，现在我想知道能否让这个渐变沿着角落弯曲，以便为我提供带有渐变的圆角边框效果。

问题是我不能使用普通的边框，因为渐变不会保持一致。

我想到了以下解决方案，它应该有助于说明我的想法： 带有渐变的圆角 http://img232.imageshack.us/img232/9899/roundedcornerrg0.th.jpg

<Grid x:Name="grid" >
    <Border
        BorderThickness="0,0,40,40"
        CornerRadius="0,0,40,0"
        Padding="2" Height="60" VerticalAlignment="Bottom" Width="65" HorizontalAlignment="Right" >
        <Border.BorderBrush>
            <RadialGradientBrush>
                <RadialGradientBrush.RelativeTransform>
                    <TransformGroup>
                        <ScaleTransform CenterX="0.5" CenterY="0.5" ScaleX="2.058" ScaleY="2.177"/>
                        <SkewTransform AngleX="0" AngleY="0" CenterX="0.5" CenterY="0.5"/>
                        <RotateTransform Angle="-119.481" CenterX="0.5" CenterY="0.5"/>
                        <TranslateTransform X="0.209" Y="0.52"/>
                    </TransformGroup>
                </RadialGradientBrush.RelativeTransform>
                <GradientStop Color="#FF000000" Offset="0"/>
                <GradientStop Color="#000A0A0A" Offset="1"/>
                <GradientStop Color="#6B050505" Offset="0.829"/>
                <GradientStop Color="#BB020202" Offset="0.763"/>
            </RadialGradientBrush>
        </Border.BorderBrush>
    </Border>
    <Rectangle VerticalAlignment="Stretch" Height="100" Width="40" HorizontalAlignment="Right" Margin="0,0,0,60" StrokeThickness="0" Panel.ZIndex="0">
        <Rectangle.Fill>
            <LinearGradientBrush EndPoint="-0.025,0.5" StartPoint="1,0.5">
                <GradientStop Color="#FF000000" Offset="0"/>
                <GradientStop Color="#000A0A0A" Offset="1"/>
                <GradientStop Color="#6B050505" Offset="0.829"/>
                <GradientStop Color="#BB020202" Offset="0.763"/>
            </LinearGradientBrush>
        </Rectangle.Fill>
    </Rectangle>
    <Rectangle VerticalAlignment="Bottom" Height="40" Width="100" HorizontalAlignment="Stretch" Margin="0,0,65,0">
        <Rectangle.Fill>
            <LinearGradientBrush EndPoint="0.5,0" StartPoint="0.5,1">
                <GradientStop Color="#FF000000" Offset="0"/>
                <GradientStop Color="#000A0A0A" Offset="1"/>
                <GradientStop Color="#6B050505" Offset="0.829"/>
                <GradientStop Color="#BB020202" Offset="0.763"/>
            </LinearGradientBrush>
        </Rectangle.Fill>
    </Rectangle>
</Grid>

有没有办法让渐变弯曲到我想要的角落？我在网上看到一个建议，是将边框嵌套在彼此中，但这对我来说也不好，因为渐变使事情变得困难。

- Louis Sayers

Answer 1

你可能想要查看Charles Petzold关于带有渐变颜色的图形路径的文章，他在其中讨论了与您类似的问题。

- Ruben Steins

Answer 2

    <Grid x:Name="grid" VerticalAlignment="Top" HorizontalAlignment="Left" Width="100" Height="100" Margin="200,200,0,0">
         <Rectangle VerticalAlignment="Stretch" Width="20" HorizontalAlignment="Right" Margin="0,20,0,20" StrokeThickness="0" Panel.ZIndex="0">
            <Rectangle.Fill>
                <LinearGradientBrush EndPoint="1,0" StartPoint="0,0">
                    <GradientStop Color="#00FFFFFF" Offset="0"/>
                    <GradientStop Color="#FFFFFFFF" Offset="1"/>
                    <GradientStop Color="#22FFFFFF" Offset="0.5"/>
                    <GradientStop Color="#11FFFFFF" Offset="0.3"/>
                </LinearGradientBrush>
            </Rectangle.Fill>
        </Rectangle>
        <Rectangle VerticalAlignment="Bottom" Height="20" HorizontalAlignment="Stretch" Margin="20,0,20,0">
            <Rectangle.Fill>
                <LinearGradientBrush EndPoint="1,1" StartPoint="1,0">
                    <GradientStop Color="#00FFFFFF" Offset="0"/>
                    <GradientStop Color="#FFFFFFFF" Offset="1"/>
                    <GradientStop Color="#22FFFFFF" Offset="0.5"/>
                    <GradientStop Color="#11FFFFFF" Offset="0.3"/>
                </LinearGradientBrush>
            </Rectangle.Fill>
        </Rectangle>
        <Rectangle VerticalAlignment="Stretch" Width="20" HorizontalAlignment="Left" Margin="0,20,0,20" StrokeThickness="0" Panel.ZIndex="0">
            <Rectangle.Fill>
                <LinearGradientBrush EndPoint="0,0" StartPoint="1,0">
                    <GradientStop Color="#00FFFFFF" Offset="0"/>
                    <GradientStop Color="#FFFFFFFF" Offset="1"/>
                    <GradientStop Color="#22FFFFFF" Offset="0.5"/>
                    <GradientStop Color="#11FFFFFF" Offset="0.3"/>
                </LinearGradientBrush>
            </Rectangle.Fill>
        </Rectangle>
        <Rectangle VerticalAlignment="Top" Height="20" HorizontalAlignment="Stretch" Margin="20,0,20,0">
            <Rectangle.Fill>
                <LinearGradientBrush EndPoint="1,0" StartPoint="1,1">
                    <GradientStop Color="#00FFFFFF" Offset="0"/>
                    <GradientStop Color="#FFFFFFFF" Offset="1"/>
                    <GradientStop Color="#22FFFFFF" Offset="0.5"/>
                    <GradientStop Color="#11FFFFFF" Offset="0.3"/>
                </LinearGradientBrush>
            </Rectangle.Fill>
        </Rectangle>
        <Rectangle VerticalAlignment="Top" Height="20" Width="20" HorizontalAlignment="Left" Margin="0,0,0,0">
            <Rectangle.Fill>
                <RadialGradientBrush Center=".9,.9" GradientOrigin="1,1" RadiusX=".85" RadiusY=".85">
                    <GradientStop Color="#00FFFFFF" Offset="0"/>
                    <GradientStop Color="#FFFFFFFF" Offset="1"/>
                    <GradientStop Color="#22FFFFFF" Offset="0.5"/>
                    <GradientStop Color="#11FFFFFF" Offset="0.3"/>
                </RadialGradientBrush>
            </Rectangle.Fill>
        </Rectangle>
        <Rectangle VerticalAlignment="Bottom" Height="20" Width="20" HorizontalAlignment="Right" Margin="0,0,0,0">
            <Rectangle.Fill>
                <RadialGradientBrush Center=".1,.1" GradientOrigin="0,0" RadiusX=".85" RadiusY=".85">
                    <GradientStop Color="#00FFFFFF" Offset="0"/>
                    <GradientStop Color="#FFFFFFFF" Offset="1"/>
                    <GradientStop Color="#22FFFFFF" Offset="0.5"/>
                    <GradientStop Color="#11FFFFFF" Offset="0.3"/>
                </RadialGradientBrush>
            </Rectangle.Fill>
        </Rectangle>
        <Rectangle VerticalAlignment="Top" Height="20" Width="20" HorizontalAlignment="Right" Margin="0,0,0,0">
            <Rectangle.Fill>
                <RadialGradientBrush Center=".1,.9" GradientOrigin="0,1" RadiusX=".85" RadiusY=".85">
                    <GradientStop Color="#00FFFFFF" Offset="0"/>
                    <GradientStop Color="#FFFFFFFF" Offset="1"/>
                    <GradientStop Color="#22FFFFFF" Offset="0.5"/>
                    <GradientStop Color="#11FFFFFF" Offset="0.3"/>
                </RadialGradientBrush>
            </Rectangle.Fill>
        </Rectangle>
        <Rectangle VerticalAlignment="Bottom" Height="20" Width="20" HorizontalAlignment="Left" Margin="0,0,0,0">
            <Rectangle.Fill>
                <RadialGradientBrush Center=".9,.1" GradientOrigin="1,0" RadiusX=".85" RadiusY=".85">
                    <GradientStop Color="#00FFFFFF" Offset="0"/>
                    <GradientStop Color="#FFFFFFFF" Offset="1"/>
                    <GradientStop Color="#22FFFFFF" Offset="0.5"/>
                    <GradientStop Color="#11FFFFFF" Offset="0.3"/>
                </RadialGradientBrush>
            </Rectangle.Fill>
        </Rectangle>
    </Grid>

- Ivamuno