前面说到了InkCanvas的基本操作，这里用一个实例来说明具体应用：绘制矩形和椭圆。
效果图
xaml代码
<Window x:Class="WPF_InkCanvas.ROI_InkCanvas"
xmlns="http://www.easck.com/winfx/2006/xaml/presentation"
xmlns:x="http://www.easck.com/winfx/2006/xaml"
xmlns:d="http://www.easck.com/expression/blend/2008"
xmlns:mc="http://www.easck.com/markup-compatibility/2006"
xmlns:local="clr-namespace:WPF_InkCanvas"
mc:Ignorable="d"
<Grid>
<Grid.RowDefinitions>
<RowDefinition/>
<RowDefinition Height="auto"/>
</Grid.RowDefinitions>
<Image Name="imgMeasure" HorizontalAlignment="Center" Stretch="Uniform"/>
<InkCanvas Name="inkCanvasMeasure" EditingMode="None" Background="Transparent" Strokes="{Binding InkStrokes, Mode=TwoWay}" HorizontalAlignment="Center"
Width="{Binding ElementName=imgMeasure, Path=ActualWidth}" Height="{Binding ElementName=imgMeasure, Path=ActualHeight}"
MouseDown="InkCanvasMeasure_MouseDown" MouseMove="InkCanvasMeasure_MouseMove">
<Label Content="{Binding MeaInfo}" Background="Transparent" HorizontalAlignment="Left" VerticalAlignment="Top" Margin="10"
FontSize="18" Foreground="Red" IsHitTestVisible="False"/>
</InkCanvas>
<StackPanel Grid.Row="1" Orientation="Horizontal">
<Button Content="OpenFile" Margin="5" HorizontalAlignment="Left" FontSize="20" Click="OpenFile_Click"/>
<ToggleButton Name="btnSquare" Content="Draw Square" Margin="5" HorizontalAlignment="Left" FontSize="20" Click="DrawSquare_Click"/>
<ToggleButton Name="btnEllipse" Content="Draw Ellipse" Margin="5" HorizontalAlignment="Left" FontSize="20" Click="DrawEllipse_Click"/>
</StackPanel>
</Grid>
</Window>
