画板基础基本完成

AIStudio.Wpf.DiagramDesigner/UserControls/DiagramControl.xaml

@@ -360,6 +360,10 @@
                                     Value="{Binding ItemWidth}" />
                 <Setter Property="Height"
                                     Value="{Binding ItemHeight}" />
+                <Setter Property="MinWidth"
+                                    Value="{Binding MinItemWidth}" />
+                <Setter Property="MinHeight"
+                                    Value="{Binding MinItemHeight}" />
                 <Setter Property="SnapsToDevicePixels"
                                     Value="True" />
                 <Setter Property="ContentTemplate">