箭头分离到独立的model中，方便自定义path

AIStudio.Wpf.DiagramDesigner.Demo/Views/ZoomView.xaml

@@ -0,0 +1,29 @@
+<UserControl x:Class="AIStudio.Wpf.DiagramDesigner.Demo.Views.ZoomView"
+             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="https://gitee.com/akwkevin/aistudio.-wpf.-diagram"
+             xmlns:controls="clr-namespace:AIStudio.Wpf.DiagramDesigner.Demo.Controls"
+             mc:Ignorable="d" 
+             d:DesignHeight="450" d:DesignWidth="800">
+    <Grid>
+        <!-- Diagram Control -->
+        <dd:DiagramControl x:Name="diagram" DataContext="{Binding DiagramViewModel}" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" />
+
+        <Slider x:Name="zoomSlider"
+                        Minimum="0.5"
+                        Value="{Binding DiagramViewModel.ZoomValue}"
+                        Maximum="2.0"
+                        IsDirectionReversed="False"
+                        IsSnapToTickEnabled="True"
+                        TickFrequency="0.1"
+                        SmallChange="0.1"
+                        LargeChange="0.1"
+                        Width="200"
+                        HorizontalAlignment="Right"
+                        VerticalAlignment="Top"/>
+
+        <controls:TitleControl/>
+    </Grid>
+</UserControl>