From 5fc1e19f71693609736f548b16d374c832759c96 Mon Sep 17 00:00:00 2001
From: Tim Young <tim.young@lightsys.org>
Date: Tue, 15 Aug 2023 15:37:29 -0700
Subject: [PATCH] When adding a link between devices, show a line so we see we
 are doing it.

---
 EduNetworkBuilder/NetworkBuilder.cs | 23 +++++++++++++++++++++--
 1 file changed, 21 insertions(+), 2 deletions(-)

diff --git a/EduNetworkBuilder/NetworkBuilder.cs b/EduNetworkBuilder/NetworkBuilder.cs
index c9400ae..e4832ab 100644
--- a/EduNetworkBuilder/NetworkBuilder.cs
+++ b/EduNetworkBuilder/NetworkBuilder.cs
@@ -1886,6 +1886,7 @@ namespace EduNetworkBuilder
 
         private void pbNetworkView_MouseMove(object sender, MouseEventArgs e)
         {
+            Image tImage;
             //Only do this 10 times a second
             if (DateTime.UtcNow - LastMoveTime < TimeSpan.FromMilliseconds(100)) return;
 
@@ -1894,7 +1895,25 @@ namespace EduNetworkBuilder
             //If we are dragging lines, do that first.
             if (selectedButton == "btnLink")
             {
-                //We are trying to do a link.  Do not drag...
+                if (MouseIsDown)
+                {
+                    //We are trying to do a link.  Drag a line...
+                    if (ItemClickedOn != null)
+                    {
+                        Point OrigCenter = ItemClickedOn.GetCenter();
+                        //Draw a line from the item-clicked on to the mouse
+                        tImage = new Bitmap(pbNetworkView.BackgroundImage.Width, pbNetworkView.BackgroundImage.Height);
+                        Graphics tGraphics = Graphics.FromImage(tImage);
+                        tGraphics.Clear(Color.Transparent); //erase the whole thing
+
+                        //draw the line
+                        //tGraphics.FillRectangle(semiTransBrush, selectbox);
+                        tGraphics.DrawLine(Pens.Black, OrigCenter, MouseLocation);
+                        pbNetworkView.Image = tImage;
+                        pbNetworkView.Invalidate();
+
+                    }
+                }
             }
             else if (MouseIsDown && LastBackgroundImage != null && ItemClickedOn != null && ItemsSelected.Count == 0) //We are trying to drag something
             {
@@ -1924,7 +1943,7 @@ namespace EduNetworkBuilder
             else if (MouseIsDown && ItemClickedOn == null) //Dragging an empty area
             {
                 //make a rectangle
-                Image tImage = new Bitmap(pbNetworkView.BackgroundImage.Width, pbNetworkView.BackgroundImage.Height);
+                tImage = new Bitmap(pbNetworkView.BackgroundImage.Width, pbNetworkView.BackgroundImage.Height);
                 Graphics tGraphics = Graphics.FromImage(tImage);
                 tGraphics.Clear(Color.Transparent); //erase the whole thing
                 int sx;