WPF rounded corners polygon

<UserControl x:Class="CustomRoundedCornersPolygon.ExamplesRoundedCornersPolygon"
             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" xmlns:CustomRoundedCornersPolygon="clr-namespace:CustomRoundedCornersPolygon" mc:Ignorable="d" 
             d:DesignHeight="600" d:DesignWidth="600">    
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="200"></RowDefinition>
            <RowDefinition Height="20"></RowDefinition>
            <RowDefinition Height="200"></RowDefinition>
            <RowDefinition Height="20"></RowDefinition>
            <RowDefinition Height="200"></RowDefinition>
        </Grid.RowDefinitions>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="200"></ColumnDefinition>
            <ColumnDefinition Width="200"></ColumnDefinition>
            <ColumnDefinition Width="200"></ColumnDefinition>
        </Grid.ColumnDefinitions>
        <Canvas Grid.Column="0" Grid.Row="0">            
            <TextBlock>1. Rounded corners triangle</TextBlock>
            <CustomRoundedCornersPolygon:RoundedCornersPolygon Points="100,10 190,180 10,180 " 
                StrokeThickness="1" ArcRoundness="25" UseRoundnessPercentage="False" Stroke="Black" IsClosed="True">                
            </CustomRoundedCornersPolygon:RoundedCornersPolygon>
        </Canvas>
        <Canvas Grid.Column="1" Grid.Row="0">
            <TextBlock>2. Rounded corners rectangle</TextBlock>
            <CustomRoundedCornersPolygon:RoundedCornersPolygon Points="10,50 180,50 180,150 10,150" 
                StrokeThickness="1" Stroke="Black" ArcRoundness="25" UseRoundnessPercentage="False" IsClosed="True"/>
        </Canvas>
        <Canvas Grid.Column="2" Grid.Row="0">
            <TextBlock>3. Rounded corners octagon</TextBlock>
            <CustomRoundedCornersPolygon:RoundedCornersPolygon Points="60,20 140,20 180,70 180,140 140,190 60,190 20,140 20,70" 
                StrokeThickness="1" Stroke="Black" ArcRoundness="15" UseRoundnessPercentage="False" IsClosed="True"/>
        </Canvas>

        <TextBlock Grid.Row="1" Grid.ColumnSpan="3" FontWeight="Bold">The same shapes but with the property UseAnglePercentage="True"</TextBlock>

        <Canvas Grid.Column="0" Grid.Row="2">
            <TextBlock>1. Rounded corners triangle</TextBlock>
            <CustomRoundedCornersPolygon:RoundedCornersPolygon Points="100,10 190,180 10,180 " 
                StrokeThickness="1" ArcRoundness="25" UseRoundnessPercentage="True" Stroke="Black" IsClosed="True">
            </CustomRoundedCornersPolygon:RoundedCornersPolygon>
        </Canvas>
        <Canvas Grid.Column="1" Grid.Row="2">
            <TextBlock>2. Rounded corners rectangle</TextBlock>
            <CustomRoundedCornersPolygon:RoundedCornersPolygon Points="10,50 180,50 180,150 10,150" 
                StrokeThickness="1" Stroke="Black" ArcRoundness="25" UseRoundnessPercentage="True" IsClosed="True"/>
        </Canvas>
        <Canvas Grid.Column="2" Grid.Row="2">
            <TextBlock>3. Rounded corners octagon</TextBlock>
            <CustomRoundedCornersPolygon:RoundedCornersPolygon Points="60,20 140,20 180,70 180,140 140,190 60,190 20,140 20,70" 
                StrokeThickness="1" Stroke="Black" ArcRoundness="15" UseRoundnessPercentage="True" IsClosed="True"/>
        </Canvas>

        <TextBlock Grid.Row="3" Grid.ColumnSpan="3" FontWeight="Bold">The same shapes but with the property IsClosed="False"</TextBlock>

        <Canvas Grid.Column="0" Grid.Row="4">
            <TextBlock>1. Rounded corners triangle</TextBlock>
            <CustomRoundedCornersPolygon:RoundedCornersPolygon Points="100,10 190,180 10,180 " 
                StrokeThickness="1" ArcRoundness="25" UseRoundnessPercentage="True" Stroke="Black" IsClosed="False">
            </CustomRoundedCornersPolygon:RoundedCornersPolygon>
        </Canvas>
        <Canvas Grid.Column="1" Grid.Row="4">
            <TextBlock>2. Rounded corners rectangle</TextBlock>
            <CustomRoundedCornersPolygon:RoundedCornersPolygon Points="10,50 180,50 180,150 10,150" 
                StrokeThickness="1" Stroke="Black" ArcRoundness="25" UseRoundnessPercentage="True" IsClosed="False"/>
        </Canvas>
        <Canvas Grid.Column="2" Grid.Row="4">
            <TextBlock>3. Rounded corners octagon</TextBlock>
            <CustomRoundedCornersPolygon:RoundedCornersPolygon Points="60,20 140,20 180,70 180,140 140,190 60,190 20,140 20,70" 
                StrokeThickness="1" Stroke="Black" ArcRoundness="15" UseRoundnessPercentage="True" IsClosed="False"/>
        </Canvas>
    </Grid>
</UserControl>