使用 min(width, height)/2 作为半径在 WPF 中绘制一个圆
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Draw a circle in WPF using min(width, height)/2 as radius
提问by Aleksandr Vishnyakov
How I can draw a circle in WPF (without code-behind) using min(width, height)/2as radius?
如何使用min(width, height)/2半径在 WPF 中绘制圆（没有代码隐藏）？
回答by Bryan
you can do it in pure XAML you just need to use Binding for the values. You also have to make sure that everything is named
你可以在纯 XAML 中完成，你只需要对值使用绑定。您还必须确保所有内容都已命名
<Grid Name="grdMain">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="75" Name="Col1" />
<ColumnDefinition Width="100" Name="Col2" />
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="75" Name="Row1" />
<RowDefinition Height="100" Name="Row2" />
</Grid.RowDefinitions>
<Ellipse Grid.Column="1" Grid.Row="1"
Canvas.Top="50"
Canvas.Left="50"
Fill="#FFFFFF00"
Height="{Binding RowDefinitions/ActualHeight, ElementName=Row1, Mode=OneWay}"
Width="{Binding ColumnDefinitions/ActualWidth, ElementName=Col1, Mode=OneWay}"
StrokeThickness="5"
Stroke="#FF0000FF"/>
</Grid>
回答by paparazzo
Where does width and height come from? Example XAML for a circle is:
宽度和高度从哪里来？圆的示例 XAML 是：
<Canvas Background="LightGray">
<Ellipse
Canvas.Top="50"
Canvas.Left="50"
Fill="#FFFFFF00"
Height="75"
Width="75"
StrokeThickness="5"
Stroke="#FF0000FF"/>
</Canvas>
A circle is just an Ellipse where Height = Width.
圆只是一个高度 = 宽度的椭圆。
