程序添加绘图元素，Demo完成一半

AIStudio.Wpf.DiagramApp/ViewModels/DrawingViewModel.cs

@@ -0,0 +1,65 @@
+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using AIStudio.Wpf.DiagramApp.Models;
+using AIStudio.Wpf.DiagramDesigner;
+using AIStudio.Wpf.DiagramDesigner.Additionals;
+using AIStudio.Wpf.Mind.Models;
+
+namespace AIStudio.Wpf.DiagramApp.ViewModels
+{
+    public class DrawingViewModel : PageViewModel
+    {
+        public DrawingViewModel(string title, string status, DiagramType diagramType) : base(title, status, diagramType)
+        {
+
+        }
+        public DrawingViewModel(string filename, DiagramDocument diagramDocument) : base(filename, diagramDocument)
+        {
+            foreach (var vm in DiagramViewModels)
+            {
+                vm.Init(false);
+            }
+        }
+
+        protected override void InitDiagramViewModel()
+        {
+            base.InitDiagramViewModel();
+
+            DiagramViewModel.DiagramOption.LayoutOption.GridCellSize = new Size(100, 100);
+            DiagramViewModel.DiagramOption.LayoutOption.ShowGrid = false;
+            DiagramViewModel.DiagramOption.LayoutOption.AllowDrop = true;
+        }
+
+
+        protected override void Init(bool initNew)
+        {
+            DiagramViewModels = new ObservableCollection<IDiagramViewModel>()
+            {
+                GetDiagramViewModel("页-1", DiagramType, initNew),
+            };
+            DiagramViewModel = DiagramViewModels.FirstOrDefault();
+
+            DesignerItemViewModelBase line = new LineDrawingDesignerItemViewModel(DiagramViewModel, new List<Point> { new Point(38, 38), new Point(118, 118) }, true);
+            DiagramViewModel.Add(line);
+
+            DesignerItemViewModelBase rectangle = new RectangleDrawingDesignerItemViewModel(DiagramViewModel, new List<Point> { new Point(138, 38), new Point(218, 118) }, true);
+            DiagramViewModel.Add(rectangle);
+
+            DesignerItemViewModelBase ellipse = new EllipseDrawingDesignerItemViewModel(DiagramViewModel, new List<Point> { new Point(238, 38), new Point(318, 118) }, true);
+            DiagramViewModel.Add(ellipse);
+
+            TextDrawingDesignerItemViewModel text = new TextDrawingDesignerItemViewModel(DiagramViewModel, new Point(338, 38), "文字", true);
+            DiagramViewModel.Add(text);
+        }
+
+        public override void Dispose()
+        {
+            base.Dispose();
+        }
+    }
+}