Clicking the shape button toggles which shape you are adding.

EduNetworkBuilder/EduNetworkBuilder.csproj

@@ -414,6 +414,7 @@
     </FileAssociation>
   </ItemGroup>
   <ItemGroup>
+    <None Include="Resources\Square.png" />
     <None Include="Resources\Shapes.png" />
     <None Include="Resources\tree.png" />
     <None Include="Resources\WAP.png" />
@@ -442,6 +443,7 @@
     <None Include="Resources\Laptop.png" />
     <None Include="Resources\microwave.png" />
     <None Include="Resources\Animations.png" />
+    <None Include="Resources\Circle.png" />
     <Content Include="Resources\NBIco.ico" />
   </ItemGroup>
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />

EduNetworkBuilder/NetShape.cs

@@ -61,16 +61,25 @@ namespace EduNetworkBuilder
                 if (FillColor == Color.Black) edgeColor = Color.White;
                 coloredBrush = new SolidBrush(edgeColor);
                 //We want to put drag-marks on the corners of our rectangle
+                foreach(Rectangle one in Corners())
+                    G.FillRectangle(coloredBrush, one);
+            }
+            G.Dispose();
+        }
+
+        List<Rectangle> Corners()
+        {
+            int sz = DragSize;
+            List<Rectangle> tCorners = new List<Rectangle>();
             Rectangle TL = new Rectangle(InArea.X, InArea.Y, sz, sz);
             Rectangle TR = new Rectangle(InArea.X + InArea.Width - sz, InArea.Y, sz, sz);
             Rectangle BL = new Rectangle(InArea.X, InArea.Y + InArea.Height - sz, sz, sz);
             Rectangle BR = new Rectangle(InArea.X + InArea.Width - sz, InArea.Y + InArea.Height - sz, sz, sz);
-                G.FillRectangle(coloredBrush, TL);
-                G.FillRectangle(coloredBrush, TR);
-                G.FillRectangle(coloredBrush, BL);
-                G.FillRectangle(coloredBrush, BR);
-            }
-            G.Dispose();
+            tCorners.Add(TL);
+            tCorners.Add(TR);
+            tCorners.Add(BL);
+            tCorners.Add(BR);
+            return tCorners;
         }
 
         public void Load(XmlNode theNode)

EduNetworkBuilder/NetworkBuilder.cs

@@ -53,6 +53,8 @@ namespace EduNetworkBuilder
         private List<NetworkDevice> ItemsSelected = new List<NetworkDevice>();
         private Point OrigClickPoint = new Point(-1, -1);
 
+        private NetShapeType CurrentShape = NetShapeType.none;
+
         private string InitialFileLoad = "";
 
         public PersonClass CurrentUser;
@@ -558,7 +560,8 @@ namespace EduNetworkBuilder
             UpdateMenu();
             UpdateMessages();
             UpdateVisuals();
-            if(selectedButton == "btnShapes")
+            btnUpdateShape();
+            if (selectedButton == "btnShapes")
             {
                 cbFillColor.Visible = true;
                 cbLineColor.Visible = true;
@@ -744,11 +747,21 @@ namespace EduNetworkBuilder
                     myNetwork.InShapeEditMode = true;
                     if (selectedButton == "btnShapes") {
                         myNetwork.InShapeEditMode = true;
+                        if (CurrentShape == NetShapeType.none) CurrentShape = NetShapeType.rectangle;
+                        if(doupdate)
+                        {
+                            //The shape was already selected.  Toggle it
+                            if (CurrentShape == NetShapeType.rectangle) CurrentShape = NetShapeType.circle;
+                            else CurrentShape = NetShapeType.rectangle;
+                        }
+                        if (CurrentShape == NetShapeType.rectangle) btn.BackgroundImage = Properties.Resources.Square;
+                        if (CurrentShape == NetShapeType.circle) btn.BackgroundImage = Properties.Resources.Circle;
                         doupdate = true;
                     }
                     else
                     {
                         myNetwork.InShapeEditMode = false;
+                        CurrentShape = NetShapeType.none;
                     }
                 }
                 else
@@ -756,15 +769,37 @@ namespace EduNetworkBuilder
                     btn.BackColor = Button.DefaultBackColor;
                 }
             }
-            if (doupdate) { UpdateForm(); }
+            if (doupdate) {
+                UpdateForm();
             }
+        }
+
         private void btnReset()
         {
             foreach (Control btn in Buttons)
             {
                 lblStatus.Text = "";
                 selectedButton = "";
+                CurrentShape = NetShapeType.none;
                 btn.BackColor = Button.DefaultBackColor;
+                if(btn.Name == "btnShapes")
+                { 
+                    if (CurrentShape == NetShapeType.rectangle) btn.BackgroundImage = Properties.Resources.Square;
+                    if (CurrentShape == NetShapeType.circle) btn.BackgroundImage = Properties.Resources.Circle;
+                    if (CurrentShape == NetShapeType.none) btn.BackgroundImage = Properties.Resources.Shapes;
+                }
+            }
+        }
+        private void btnUpdateShape()
+        {
+            foreach (Control btn in Buttons)
+            {
+                if (btn.Name == "btnShapes")
+                {
+                    if (CurrentShape == NetShapeType.rectangle) btn.BackgroundImage = Properties.Resources.Square;
+                    if (CurrentShape == NetShapeType.circle) btn.BackgroundImage = Properties.Resources.Circle;
+                    if (CurrentShape == NetShapeType.none) btn.BackgroundImage = Properties.Resources.Shapes;
+                }
             }
         }
 

EduNetworkBuilder/Properties/Resources.Designer.cs

@@ -110,6 +110,16 @@ namespace EduNetworkBuilder.Properties {
             }
         }
         
+        /// <summary>
+        ///   Looks up a localized resource of type System.Drawing.Bitmap.
+        /// </summary>
+        internal static System.Drawing.Bitmap Circle {
+            get {
+                object obj = ResourceManager.GetObject("Circle", resourceCulture);
+                return ((System.Drawing.Bitmap)(obj));
+            }
+        }
+        
         /// <summary>
         ///   Looks up a localized resource of type System.IO.UnmanagedMemoryStream similar to System.IO.MemoryStream.
         /// </summary>
@@ -1250,6 +1260,16 @@ namespace EduNetworkBuilder.Properties {
             }
         }
         
+        /// <summary>
+        ///   Looks up a localized resource of type System.Drawing.Bitmap.
+        /// </summary>
+        internal static System.Drawing.Bitmap Square {
+            get {
+                object obj = ResourceManager.GetObject("Square", resourceCulture);
+                return ((System.Drawing.Bitmap)(obj));
+            }
+        }
+        
         /// <summary>
         ///   Looks up a localized resource of type System.Drawing.Bitmap.
         /// </summary>

EduNetworkBuilder/Properties/Resources.resx

@@ -505,9 +505,15 @@
   <data name="Level0_Frozen" type="System.Resources.ResXFileRef, System.Windows.Forms">
     <value>..\Resources\Level0_Frozen.enbx;System.Byte[], mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
   </data>
+  <data name="Circle" type="System.Resources.ResXFileRef, System.Windows.Forms">
+    <value>..\Resources\Circle.png;System.Drawing.Bitmap, System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a</value>
+  </data>
   <data name="Shapes" type="System.Resources.ResXFileRef, System.Windows.Forms">
     <value>..\Resources\Shapes.png;System.Drawing.Bitmap, System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a</value>
   </data>
+  <data name="Square" type="System.Resources.ResXFileRef, System.Windows.Forms">
+    <value>..\Resources\Square.png;System.Drawing.Bitmap, System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a</value>
+  </data>
   <data name="tree" type="System.Resources.ResXFileRef, System.Windows.Forms">
     <value>..\Resources\tree.png;System.Drawing.Bitmap, System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a</value>
   </data>