Question

我创建了一个UserControl，它是一个环形，通过叠加2个圆圈，小圆圈为空白，第二个圆圈位于最小的圆圈后面。

在我的WPF应用程序中，我想放几个铃声，但小圈子确实隐藏了其他铃声。我想通过它看一看并捕捉鼠标事件，以便在其他环之后响铃，否则它不是真正的环。有可能吗？

我尝试使用OpacityMask作为小椭圆，如http://social.msdn.microsoft.com/forums/en-US/wpf/thread/551201d1-c5b3-4e17-ae63-625cfbb8bcc4的答案所指出的那样，但仍然无法看到背后的环：

<UserControl x:Class="MyUserControls.MyRing"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             mc:Ignorable="d" 
             d:DesignHeight="150" d:DesignWidth="150" SizeChanged="UserControl_SizeChanged">
    <Grid Height="150" Name="Grid" Width="150" MouseMove="ellipse1_MouseMove">
        <Ellipse Fill="Red" Height="150" Width="150" HorizontalAlignment="Left" Margin="0,0,0,0" Name="ellipse1" Stroke="Black" VerticalAlignment="Top"  >
            <Ellipse.OpacityMask>
                <RadialGradientBrush>
                    <GradientStop Color="#FFB94444" Offset="0.496"/>
                    <GradientStop Color="#00FFFFFF" Offset="0.491"/>
                </RadialGradientBrush>
            </Ellipse.OpacityMask>
        </Ellipse>
        <Ellipse Fill="White" Height="100" Width="100" Margin="25,25,25,0" Name="ellipse2" Stroke="Black" VerticalAlignment="Top" />       
    </Grid>
</UserControl>

enter image description here

Answer 1

看起来你已经找到了答案（几年前），但对于其他任何想要这样做的人，你可能想看一下CompositeGeometry：

http://msdn.microsoft.com/en-us/library/ms751808.aspx#combindgeometriessection

如：

<Path Fill="Red" Stroke="Black">
    <Path.Data>
        <CombinedGeometry GeometryCombineMode="Xor">
            <CombinedGeometry.Geometry1>
                <EllipseGeometry RadiusX="75" RadiusY="75" Center="75,75" />
            </CombinedGeometry.Geometry1>
            <CombinedGeometry.Geometry2>
                <EllipseGeometry RadiusX="50" RadiusY="50" Center="75,75" />
            </CombinedGeometry.Geometry2>
        </CombinedGeometry>
    </Path.Data>
</Path>

然后IsHitTestVisible="False"应该在需要时防止鼠标干扰。

Answer 2

您可以在UserControl中创建一个透明背景和StrokeThickness的圆圈。

<UserControl x:Class="WpfApplication1.UserControl1"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             mc:Ignorable="d" 
             d:DesignHeight="300" d:DesignWidth="300">
    <Grid>
        <Ellipse Width="50" Height="50" Stroke="Blue" StrokeThickness="10" Fill="Transparent"></Ellipse>
    </Grid>
</UserControl>

编辑：您可以将渐变画笔设置为笔划，如下所示。您可以根据需要将LinearGradientBrush替换为任何其他类型的画笔。

<Ellipse Width="50" Height="50" StrokeThickness="10" Fill="Transparent">
    <Ellipse.Stroke>
        <LinearGradientBrush>
            <GradientStop Offset="0" Color="Red"/>
            <GradientStop Offset="1" Color="Green"/>
        </LinearGradientBrush>
    </Ellipse.Stroke>
</Ellipse>

Answer 3

查看此How to create a doughnut with a transparent center?。

带有路径和按钮的代码：

<Grid x:Name="LayoutRoot" Width="109" Height="109">

    <Button Content="Below" Width="100" Height="100" />

    <Path Fill="#FF1F96D8" Stroke="#FF000000"
        Width="109" HorizontalAlignment="Left" Stretch="None"
        Data="M54.5,32.5 C41.245167,32.5 30.5,43.021309 30.5,56         
          30.5,68.978691 41.245167,79.5 54.5,79.5 C67.754837,79.5         
          78.5,68.978691 78.5,56 C78.5,43.021309 67.754837,32.5        
          54.5,32.5 z M54.5,0.5 C84.32338,0.5 108.5,24.676624         
          108.5,54.5 C108.5,84.32338 84.32338,108.5 54.5,108.5         
          24.676624,108.5 0.5,84.32338 0.5,54.5 0.5,24.676624         
          24.676624,0.5 54.5,0.5 z" Height="109" />


</Grid>

如何在WPF中创建一个圆圈孔？

3 个答案: