Map Analysis mode can now check the map for unconnected vertices.

Source/Plugins/BuilderModes/BuilderModes.csproj

@@ -233,10 +233,12 @@
     <Compile Include="ClassicModes\FloorAlignMode.cs" />
     <Compile Include="ClassicModes\SnapVerticesMode.cs" />
     <Compile Include="ErrorChecks\CheckMissingTextures.cs" />
+    <Compile Include="ErrorChecks\CheckStrayVertices.cs" />
     <Compile Include="ErrorChecks\CheckUnknownFlats.cs" />
     <Compile Include="ErrorChecks\CheckUnknownTextures.cs" />
     <Compile Include="ErrorChecks\CheckUnknownThings.cs" />
     <Compile Include="ErrorChecks\ResultNoErrors.cs" />
+    <Compile Include="ErrorChecks\ResultStrayVertex.cs" />
     <Compile Include="ErrorChecks\ResultStuckThingInThing.cs" />
     <Compile Include="ErrorChecks\ResultTextureMissing.cs" />
     <Compile Include="ErrorChecks\ResultUnknownFlat.cs" />

Source/Plugins/BuilderModes/ErrorChecks/CheckStrayVertices.cs

@@ -0,0 +1,42 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using CodeImp.DoomBuilder.Map;
+using System.Threading;
+
+namespace CodeImp.DoomBuilder.BuilderModes.ErrorChecks
+{
+	[ErrorChecker("Check unconnected vertices", true, 50)]
+	public class CheckStrayVertices : ErrorChecker
+	{
+		private int PROGRESS_STEP = 1000;
+
+		// Constructor
+		public CheckStrayVertices() {
+			// Total progress is done when all vertices are checked
+			SetTotalProgress(General.Map.Map.Vertices.Count / PROGRESS_STEP);
+		}
+
+		// This runs the check
+		public override void Run() {
+			int progress = 0;
+			int stepprogress = 0;
+
+			// Go for all things
+			foreach(Vertex v in General.Map.Map.Vertices) {
+				if(v.Linedefs == null || v.Linedefs.Count == 0)
+					SubmitResult(new ResultStrayVertex(v));
+
+				// Handle thread interruption
+				try { Thread.Sleep(0); } catch(ThreadInterruptedException) { return; }
+
+				// We are making progress!
+				if((++progress / PROGRESS_STEP) > stepprogress) {
+					stepprogress = (progress / PROGRESS_STEP);
+					AddProgress(1);
+				}
+			}
+		}
+	}
+}

Source/Plugins/BuilderModes/ErrorChecks/ResultStrayVertex.cs

@@ -0,0 +1,44 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using CodeImp.DoomBuilder.Map;
+using CodeImp.DoomBuilder.Rendering;
+using System.Drawing;
+
+namespace CodeImp.DoomBuilder.BuilderModes.ErrorChecks
+{
+	public class ResultStrayVertex : ErrorResult
+	{
+		public override int Buttons { get { return 1; } }
+		public override string Button1Text { get { return "Delete Vertex"; } }
+
+		private Vertex vertex;
+
+		// Constructor
+		public ResultStrayVertex(Vertex v) {
+			// Initialize
+			this.vertex = v;
+			this.viewobjects.Add(v);
+			this.description = "This vertex is not connected to any linedef.";
+		}
+
+		// This must return the string that is displayed in the listbox
+		public override string ToString() {
+			return "Vertex " + vertex.Index + " at " + vertex.Position.x + ", " + vertex.Position.y + " is not connected to any linedef.";
+		}
+
+		// Rendering
+		public override void RenderOverlaySelection(IRenderer2D renderer) {
+			renderer.RenderRectangleFilled(new RectangleF(vertex.Position.x - 3, vertex.Position.y - 3, 6f, 6f), General.Colors.Selection, true);
+		}
+
+		// This removes the vertex
+		public override bool Button1Click() {
+			General.Map.UndoRedo.CreateUndo("Delete vertex");
+			vertex.Dispose();
+			General.Map.IsChanged = true;
+			General.Map.ThingsFilter.Update();
+			return true;
+		}
+	}
+}