WPF DrawingContext Pen

 

<Window x:Class="WPFDrawing.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WPFDrawing"
        mc:Ignorable="d"
        Title="MainWindow"
        Height="600"
        Width="800">
    <Grid>
        <Grid.RowDefinitions>

            <RowDefinition Height="*" />
            <RowDefinition Height="50" />
        </Grid.RowDefinitions>
        <local:DrawingCanvas x:Name="drawCanvas"
                             Background="LightGray"
                             MouseLeftButtonDown="drawCanvas_MouseLeftButtonDown"
                             MouseMove="drawCanvas_MouseMove">

        </local:DrawingCanvas>
        <Button Content="test"
                Width="100"
                Grid.Row="1"
                Click="Button_Click"></Button>
    </Grid>
</Window>

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