使用 WPF 制作 公章，主要使用到的知识点有：缩放变换，旋转变换的知识。下面附上xaml代码。
<Grid >
<!--背景图片,可有可无-->
<Grid.Background>
<LinearGradientBrush>
<GradientStop Color="Blue" Offset="0"/>
<GradientStop Color="yellow" Offset="0.5"/>
<GradientStop Color="Red" Offset="1"/>
</LinearGradientBrush>
</Grid.Background>
<Grid.Resources>
<!--定义label的样式-->
<Style TargetType="{x:Type Label}">
<Setter Property="RenderTransformOrigin" >
<Setter.Value>
<Point X="0.5" Y="2.5"/>
</Setter.Value>
</Setter>
<Setter Property="Width" Value="56"/>
<Setter Property="Height" Value="50"/>
<Setter Property="FontSize" Value="30"/>
<Setter Property="Foreground" Value="#ffff0000"/>
<Setter Property="VerticalAlignment" Value="Top"/>
<Setter Property="RenderTransform">
<Setter.Value>
<TransformGroup>
<ScaleTransform ScaleX="0.6" ScaleY="1"/>
<!--绑定到Tag上,用于旋转的角度-->
<RotateTransform Angle="{Binding Tag,RelativeSource={RelativeSource AncestorType=Label}}"/>
</TransformGroup>
</Setter.Value>
</Setter>
</Style>
</Grid.Resources>
<!--外侧圆圈-->
<Ellipse Margin="0,1,0,0"
Height="250" Fill="{x:Null}"
Stroke="#FFFF0000"
x:Name="EllipseBorder"
HorizontalAlignment="Center"
VerticalAlignment="Top"
Width="250"
StrokeThickness="1"/>
<!--中间的五角星-->
<Path StrokeThickness="1.000000" Stroke="{x:Null}"
Fill="#FFFF0000"
Data="F1 M 55.467773,1.628906 L 68.130859,40.893066 L 109.385742,40.802734 L 75.957031,64.979004 L 88.791016,104.187500 L 55.467773,79.865234 L 22.144531,104.187500 L 34.978516,64.979004 L 1.549805,40.802734 L 42.804688,40.893066 L 55.467773,1.628906 Z"
HorizontalAlignment="Center"
RenderTransformOrigin="0.5,0.5"
VerticalAlignment="Center">
<Path.RenderTransform>
<TransformGroup>
<ScaleTransform ScaleX="0.68" ScaleY="0.68"/>
<SkewTransform AngleX="0" AngleY="0"/>
<RotateTransform Angle="0"/>
<TranslateTransform X="0" Y="0"/>
</TransformGroup>
</Path.RenderTransform>
</Path>
<!--下面是一堆文字和角度-->
<Label Content="我" Tag="10"/>
<Label Content="是" Tag="30"/>
<Label Content="一" Tag="50"/>
<Label Content="只" Tag="70"/>
<Label Content="快" Tag="90"/>
<Label Content="乐" Tag="110"/>
<Label Content="的" Tag="130"/>
<Label Content="小" Tag="150"/>
<Label Content="黄" Tag="170"/>
<Label Content="鸭" Tag="190"/>
<Label Content="黄" Tag="210"/>
<Label Content="黄" Tag="230"/>
<Label Content="黄" Tag="250"/>
<Label Content="黄" Tag="270"/>
<Label Content="黄" Tag="290"/>
<Label Content="黄" Tag="310"/>
<Label Content="~" Tag="330"/>
<Label Content="~" Tag="350"/>
</Grid>
大致效果已经出来了，其它美化就要你们自己动手啦~
效果图：
