aistudio-wpf-diagram/AIStudio.Wpf.DiagramDesigner/UserControls/LineControl.xaml

<UserControl x:Class="AIStudio.Wpf.DiagramDesigner.LineControl"
             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:dd="clr-namespace:AIStudio.Wpf.DiagramDesigner"         
             mc:Ignorable="d" 
             d:DesignHeight="450" d:DesignWidth="800">
    <UserControl.Resources>
        <dd:ColorBrushConverter x:Key="ColorBrushConverter" />
        <dd:LineDashConverter x:Key="LineDashConverter"/>
        <dd:ArrowPathConverter x:Key="ArrowPathConverter"/>
        <dd:ArrowSizeConverter x:Key="ArrowSizeConverter"/>
        <dd:MathConverter x:Key="MathAddConverter" Operation="Add" />
        <BooleanToVisibilityConverter x:Key="BooleanToVisibilityConverter"/>
        
        <Style x:Key="LineStyle" TargetType="Path">
            <Setter Property="Stroke" Value="{Binding ColorViewModel.LineColor,Converter={StaticResource ColorBrushConverter}}"/>
            <Style.Triggers>
                <DataTrigger Value="True" Binding="{Binding IsSelected}">
                    <Setter Property="Stroke" Value="Black"/>
                </DataTrigger>
            </Style.Triggers>
        </Style>
        <Style x:Key="ArrowStyle" TargetType="Path">
            <!--<Setter Property="Stroke" Value="{Binding ColorViewModel.LineColor,Converter={StaticResource ColorBrushConverter}}"/>-->
            <Setter Property="Fill" Value="{Binding ColorViewModel.LineColor,Converter={StaticResource ColorBrushConverter}}"/>
            <Style.Triggers>
                <DataTrigger Value="True" Binding="{Binding IsSelected}">
                    <!--<Setter Property="Stroke" Value="Black"/>-->
                    <Setter Property="Fill" Value="Black"/>
                </DataTrigger>
            </Style.Triggers>
        </Style>
    </UserControl.Resources>
    <Grid>
        <Canvas x:Name="rootCanvas">
            <Path x:Name="line" StrokeThickness="{Binding ColorViewModel.LineWidth}"  
                                StrokeDashArray="{Binding ColorViewModel.LineDashStyle,Converter={StaticResource LineDashConverter}}"
                                Style="{StaticResource LineStyle}"
                                StrokeLineJoin="Round"
                                StrokeStartLineCap="Round"
                                StrokeEndLineCap="Round">
                <Path.Data>
                    <MultiBinding Converter="{x:Static dd:ConnectionPathConverter.Instance}">
                        <Binding Path="PathGeneratorResult"/>
                    </MultiBinding>
                </Path.Data>
            </Path>

            <Grid Canvas.Left="{Binding EndRectangle.Left}" 
                  Canvas.Top="{Binding EndRectangle.Top}"
                  Width="{Binding EndRectangle.Width}"
                  Height="{Binding EndRectangle.Height}">
                <Path x:Name="rightarrow" 
                    Data="{Binding ShapeViewModel.SinkMarker.Path}"              
                    Width="{Binding ShapeViewModel.SinkMarker.Width}"
                    Height="{Binding ShapeViewModel.SinkMarker.Height}"
                    Stretch="Fill" 
                    VerticalAlignment="Center"
                    HorizontalAlignment="Center"
                    RenderTransformOrigin="0.5,0.5"                   
                    Style="{StaticResource ArrowStyle}">
                    <Path.RenderTransform>
                        <TransformGroup>
                            <RotateTransform Angle="{Binding EndAngle}"/>
                        </TransformGroup>
                    </Path.RenderTransform>
                </Path>
            </Grid>

            <Grid Canvas.Left="{Binding StartRectangle.Left}" 
                  Canvas.Top="{Binding StartRectangle.Top}"
                  Width="{Binding StartRectangle.Width}"
                  Height="{Binding StartRectangle.Height}">
                <Path x:Name="leftarrow" 
                    Data="{Binding ShapeViewModel.SourceMarker.Path}"               
                    Width="{Binding ShapeViewModel.SourceMarker.Width}"
                    Height="{Binding ShapeViewModel.SourceMarker.Height}"
                    Stretch="Fill" 
                    VerticalAlignment="Center"
                    HorizontalAlignment="Center"                                               
                    RenderTransformOrigin="0.5,0.5"               
                    Style="{StaticResource ArrowStyle}">
                    <Path.RenderTransform>
                        <TransformGroup>
                            <RotateTransform Angle="{Binding StartAngle}"/>
                        </TransformGroup>
                    </Path.RenderTransform>
                </Path>
            </Grid>

            <Rectangle Canvas.Left="{Binding StartPoint.X}" 
                      Canvas.Top="{Binding StartPoint.Y}"
                      Fill="DarkRed"
                      Width="{Binding SourceConnectorInfo.ConnectorWidth}"
                      Height="{Binding SourceConnectorInfo.ConnectorHeight}"
                      Visibility="{Binding IsSelected,Converter={StaticResource BooleanToVisibilityConverter}}" />

            <Ellipse  Canvas.Left="{Binding EndPoint.X}" 
                      Canvas.Top="{Binding EndPoint.Y}"
                      Fill="DarkRed"
                      Width="{Binding SinkConnectorInfo.ConnectorWidth}"
                      Height="{Binding SinkConnectorInfo.ConnectorHeight}"
                      Visibility="{Binding IsSelected,Converter={StaticResource BooleanToVisibilityConverter}}" />

            <Path x:Name="ball"
                      Stretch="Fill"
                      Data="{Binding AnimationViewModel.AnimationPath.Path}"
                      Fill="{Binding AnimationViewModel.Color,Converter={StaticResource ColorBrushConverter}}"
                      Width="{Binding AnimationViewModel.AnimationPath.Width}"
                      Height="{Binding AnimationViewModel.AnimationPath.Height}"
                      Panel.ZIndex="1" />
        </Canvas>
    </Grid>
</UserControl>