Draws vector arrow between Doom format line-to-line specials (#602)

Build/Configurations/Includes/Boom_linedefs.cfg

@@ -464,72 +464,84 @@ teleport
 	{
 		title = "Teleport (also monsters, silent, same angle)";
 		prefix = "W1";
+		linetolinetag = true;
 	}
 	
 	208
 	{
 		title = "Teleport (also monsters, silent, same angle)";
 		prefix = "WR";
+		linetolinetag = true;
 	}
 	
 	209
 	{
 		title = "Teleport (also monsters, silent, same angle)";
 		prefix = "S1";
+		linetolinetag = true;
 	}
 	
 	210
 	{
 		title = "Teleport (also monsters, silent, same angle)";
 		prefix = "SR";
+		linetolinetag = true;
 	}
 	
 	243
 	{
 		title = "Teleport to Line With Same Tag (silent, same angle)";
 		prefix = "W1";
+		linetolinetag = true;
 	}
 	
 	244
 	{
 		title = "Teleport to Line With Same Tag (silent, same angle)";
 		prefix = "WR";
+		linetolinetag = true;
 	}
 	
 	262
 	{
 		title = "Teleport to Line With Same Tag (silent, reversed angle)";
 		prefix = "W1";
+		linetolinetag = true;
 	}
 	
 	263
 	{
 		title = "Teleport to Line With Same Tag (silent, reversed angle)";
 		prefix = "WR";
+		linetolinetag = true;
 	}
 	
 	264
 	{
 		title = "Teleport to Line With Same Tag (monsters only, silent, reversed angle)";
 		prefix = "W1";
+		linetolinetag = true;
 	}
 	
 	265
 	{
 		title = "Teleport to Line With Same Tag (monsters only, silent, reversed angle)";
 		prefix = "WR";
+		linetolinetag = true;
 	}
 	
 	266
 	{
 		title = "Teleport to Line With Same Tag (monsters only, silent)";
 		prefix = "W1";
+		linetolinetag = true;
 	}
 	
 	267
 	{
 		title = "Teleport to Line With Same Tag (monsters only, silent)";
 		prefix = "WR";
+		linetolinetag = true;
 	}
 	
 	268
@@ -886,6 +898,7 @@ translucent
 	{
 		title = "Translucent (Middle Texture)";
 		prefix = "";
+		linetolinetag = true;
 		
 		errorchecker
 		{

Build/Configurations/Includes/Eternity_linedefs.cfg

@@ -3487,6 +3487,8 @@ udmf
 				title = "Non-interactive";
 				type = 3;
 			}
+			linetolinetag = true;
+			linetolinesameaction = true;
 		}
 	}
 

Build/Configurations/Includes/MBF21_linedefs.cfg

@@ -5,17 +5,20 @@ scroll
   {
     title = "Scroll Wall with Same Tag using Sidedef Offsets";
     prefix = "";
+    linetolinetag = true;
   }
 
   1025
   {
     title = "Scroll Wall with Same Tag using Sidedef Offsets when Sector Changes Height";
     prefix = "";
+    linetolinetag = true;
   }
 
   1026
   {
     title = "Scroll Wall with Same Tag using Sidedef Offsets Accelerates when Sector Changes Height";
     prefix = "";
+    linetolinetag = true;
   }
 }

Source/Core/Config/LinedefActionInfo.cs

@@ -58,6 +58,8 @@ namespace CodeImp.DoomBuilder.Config
 		private readonly bool isgeneralized;
 		private readonly bool isknown;
 		private readonly bool requiresactivation; //mxd
+		private readonly bool linetolinetag;
+		private readonly bool linetolinesameaction;
 		private readonly ErrorCheckerExemptions errorcheckerexemptions;
 		
 		#endregion
@@ -75,6 +77,8 @@ namespace CodeImp.DoomBuilder.Config
 		public bool IsNull { get { return (index == 0); } }
 		public bool RequiresActivation { get { return requiresactivation; } } //mxd
 		public ArgumentInfo[] Args { get { return args; } }
+		public bool LineToLineTag { get { return linetolinetag; } }
+		public bool LineToLineSameAction { get { return linetolinesameaction; } }
 		public ErrorCheckerExemptions ErrorCheckerExemptions { get { return errorcheckerexemptions; } }
 
 		#endregion
@@ -102,6 +106,10 @@ namespace CodeImp.DoomBuilder.Config
 			this.title = this.prefix + " " + this.name;
 			this.title = this.title.Trim();
 
+			// Read line-to-line associations
+			this.linetolinetag = cfg.ReadSetting(actionsetting + ".linetolinetag", false);
+			this.linetolinesameaction = cfg.ReadSetting(actionsetting + ".linetolinesameaction", false);
+
 			// Error checker exemptions
 			this.errorcheckerexemptions.IgnoreUpperTexture = cfg.ReadSetting(actionsetting + ".errorchecker.ignoreuppertexture", false);
 			this.errorcheckerexemptions.IgnoreMiddleTexture = cfg.ReadSetting(actionsetting + ".errorchecker.ignoremiddletexture", false);

Source/Core/Map/Linedef.cs

@@ -766,6 +766,19 @@ namespace CodeImp.DoomBuilder.Map
 		
 		#region ================== Methods
 
+		// Determine if this line and another line are associated by action and tag.
+		public bool IsAssociatedWith(Linedef ld)
+		{
+			LinedefActionInfo actioninfo;
+
+			return this != ld &&
+				Action > 0 &&
+				ld.Tag > 0 &&
+				tags.Contains(ld.Tag) &&
+				(actioninfo = General.Map.Config.GetLinedefActionInfo(Action)).LineToLineTag &&
+				(!actioninfo.LineToLineSameAction || Action == ld.Action);
+		}
+
 		// This checks and returns a flag without creating it
 		public bool IsFlagSet(string flagname)
 		{

Source/Plugins/BuilderModes/General/Association.cs

@@ -237,6 +237,25 @@ namespace CodeImp.DoomBuilder.BuilderModes
 			bool showforwardlabel = BuilderPlug.Me.EventLineLabelVisibility == 1 || BuilderPlug.Me.EventLineLabelVisibility == 3;
 			bool showreverselabel = BuilderPlug.Me.EventLineLabelVisibility == 2 || BuilderPlug.Me.EventLineLabelVisibility == 3;
 
+			// Association from line to line according to the action and tag.
+			if (tags.Count > 0 && element is Linedef)
+			{
+				Linedef ld = element as Linedef;
+
+				if (ld.Action > 0)
+				{
+					foreach (Linedef otherlinedef in General.Map.Map.Linedefs)
+					{
+						if (ld.IsAssociatedWith(otherlinedef))
+						{
+							linedefs.Add(otherlinedef);
+
+							AddLineToAction(showreverselabel ? GetActionDescription(ld) : string.Empty, center, otherlinedef.GetCenterPoint());
+						}
+					}
+				}
+			}
+
 			// Special handling for Doom format maps where there the linedef's tag references sectors
 			if (General.Map.Config.LineTagIndicatesSectors)
 			{