BaseVisualMode.cs

#region ================== Copyright (c) 2007 Pascal vd Heiden

/*
 * Copyright (c) 2007 Pascal vd Heiden, www.codeimp.com
 * This program is released under GNU General Public License
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 */

#endregion

#region ================== Namespaces

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Windows.Forms;
using CodeImp.DoomBuilder.BuilderModes.Interface;
using CodeImp.DoomBuilder.Windows;
using CodeImp.DoomBuilder.Map;
using CodeImp.DoomBuilder.Rendering;
using CodeImp.DoomBuilder.Geometry;
using CodeImp.DoomBuilder.Editing;
using CodeImp.DoomBuilder.Actions;
using CodeImp.DoomBuilder.VisualModes;
using CodeImp.DoomBuilder.Config;
using CodeImp.DoomBuilder.GZBuilder.Data;
using CodeImp.DoomBuilder.Types;
using CodeImp.DoomBuilder.Data;

#endregion

namespace CodeImp.DoomBuilder.BuilderModes
{
	[EditMode(DisplayName = "GZDB Visual Mode",
			  SwitchAction = "gzdbvisualmode", // Action name used to switch to this mode
			  ButtonImage = "VisualModeGZ.png",	// Image resource name for the button
			  ButtonOrder = 1,					// Position of the button (lower is more to the left)
			  ButtonGroup = "001_visual",
			  UseByDefault = true)]

	public class BaseVisualMode : VisualMode
	{
		#region ================== Constants
		// Object picking
		private const long PICK_INTERVAL = 80;
		private const long PICK_INTERVAL_PAINT_SELECT = 10; // biwa
		private const float PICK_RANGE = 0.98f;

		// Gravity
		private const float GRAVITY = -0.06f;
		
		#endregion
		
		#region ================== Variables

		// Gravity
		private Vector3D gravity;
		private double cameraflooroffset = 41.0;		// same as in doom
		private double cameraceilingoffset = 10.0;
		
		// Object picking
		private VisualPickResult target;
		private long lastpicktime;
		private bool locktarget;
		private bool useSelectionFromClassicMode;//mxd
		private readonly Timer selectioninfoupdatetimer; //mxd

		// This keeps extra element info
		private Dictionary<Sector, SectorData> sectordata;
		private Dictionary<Thing, ThingData> thingdata;
		private Dictionary<Vertex, VertexData> vertexdata; //mxd
		//private Dictionary<Thing, EffectDynamicLight> lightdata; //mxd
		
		// This is true when a selection was made because the action is performed
		// on an object that was not selected. In this case the previous selection
		// is cleared and the targeted object is temporarely selected to perform
		// the action on. After the action is completed, the object is deselected.
		private bool singleselection;
		
		// We keep these to determine if we need to make a new undo level
		private bool selectionchanged;
		private int lastundogroup;
		private VisualActionResult actionresult;
		private bool undocreated;

		// List of selected objects when an action is performed
		private List<IVisualEventReceiver> selectedobjects;
		
		//mxd. Used in Cut/PasteSelection actions
		private readonly List<ThingCopyData> copybuffer;
		private Type lasthighlighttype;

		// biwa. Info for paint selection
		protected bool paintselectpressed;
		protected Type paintselecttype = null;
		protected IVisualPickable highlighted; // biwa

		//mxd. Moved here from Tools
		private struct SidedefAlignJob
		{
			public Sidedef sidedef;

			public double offsetx;
			public double scaleX; //mxd
			public double scaleY; //mxd

			private Sidedef controlside; //mxd
			public Sidedef controlSide
			{
				get
				{
					return controlside;
				}
				set
				{
					controlside = value;
					ceilingheight = (controlside.Index != sidedef.Index && controlside.Line.Args[1] == 0 ? controlside.Sector.FloorHeight : controlside.Sector.CeilHeight);
				}
			}

			private int ceilingheight; //mxd
			public int ceilingHeight { get { return ceilingheight; } } //mxd

			// When this is true, the previous sidedef was on the left of
			// this one and the texture X offset of this sidedef can be set
			// directly. When this is false, the length of this sidedef
			// must be subtracted from the X offset first.
			public bool forward;
		}
		
		#endregion
		
		#region ================== Properties

		public override object HighlightedObject
		{
			get
			{
				// Geometry picked?
				VisualGeometry vg = target.picked as VisualGeometry;
				if(vg != null)
				{
					if(vg.Sidedef != null) return vg.Sidedef;
					if(vg.Sector != null) return vg.Sector;
					return null;
				}
				// Thing picked?
				VisualThing vt = target.picked as VisualThing;
				if(vt != null) return vt.Thing;

				return null;
			}
		}

		public object HighlightedTarget { get { return target.picked; } } //mxd
		public bool UseSelectionFromClassicMode { get { return useSelectionFromClassicMode; } } //mxd

		new public IRenderer3D Renderer { get { return renderer; } }
		
		public bool IsSingleSelection { get { return singleselection; } }
		public bool SelectionChanged { get { return selectionchanged; } set { selectionchanged |= value; } }

		public bool PaintSelectPressed { get { return paintselectpressed; } } // biwa
		public Type PaintSelectType { get { return paintselecttype; } set { paintselecttype = value; } } // biwa
		public IVisualPickable Highlighted { get { return highlighted; } } // biwa

		#endregion
		
		#region ================== Constructor / Disposer

		// Constructor
		public BaseVisualMode()
		{
			// Initialize
			this.gravity = new Vector3D(0.0f, 0.0f, 0.0f);
			this.selectedobjects = new List<IVisualEventReceiver>();
			
			//mxd
			this.copybuffer = new List<ThingCopyData>();
			this.selectioninfoupdatetimer = new Timer();
			selectioninfoupdatetimer.Interval = 100;
			selectioninfoupdatetimer.Tick += SelectioninfoupdatetimerOnTick;
			
			// We have no destructor
			GC.SuppressFinalize(this);
		}

		// Disposer
		public override void Dispose()
		{
			// Not already disposed?
			if(!isdisposed)
			{
				// Clean up
				selectioninfoupdatetimer.Dispose(); //mxd
				
				// Done
				base.Dispose();
			}
		}

		#endregion
		
		#region ================== Methods

		// This calculates brightness level
		internal int CalculateBrightness(int level)
		{
			return renderer.CalculateBrightness(level);
		}

		//mxd. This calculates brightness level with doom-style shading
		internal int CalculateBrightness(int level, Sidedef sd) 
		{
			return renderer.CalculateBrightness(level, sd);
		}
		
		// This adds a selected object
		internal void AddSelectedObject(IVisualEventReceiver obj)
		{
			selectedobjects.Add(obj);
			selectionchanged = true;
			selectioninfoupdatetimer.Start(); //mxd
		}
		
		// This removes a selected object
		internal void RemoveSelectedObject(IVisualEventReceiver obj)
		{
			selectedobjects.Remove(obj);
			selectionchanged = true;
			selectioninfoupdatetimer.Start(); //mxd
		}
		
		// This is called before an action is performed
		public void PreAction(int multiselectionundogroup)
		{
			actionresult = new VisualActionResult();

			PickTargetUnlocked();

			// If the action is not performed on a selected object, clear the
			// current selection and make a temporary selection for the target.
			if ((target.picked != null) && !target.picked.Selected && (BuilderPlug.Me.VisualModeClearSelection || (selectedobjects.Count == 0)))
			{
				// Single object, no selection
				singleselection = true;

				// Only clear the selection if anything is selected, since it can be very time consuming on huge maps
				if(BuilderPlug.Me.VisualModeClearSelection && selectedobjects.Count > 0)
					ClearSelection();

				undocreated = false;
			}
			else
			{
				singleselection = false;
				
				// Check if we should make a new undo level
				// We don't want to do this if this is the same action with the same
				// selection and the action wants to group the undo levels
				if((lastundogroup != multiselectionundogroup) || (lastundogroup == UndoGroup.None) ||
				   (multiselectionundogroup == UndoGroup.None) || selectionchanged)
				{
					// We want to create a new undo level, but not just yet
					lastundogroup = multiselectionundogroup;
					undocreated = false;
				}
				else
				{
					// We don't want to make a new undo level (changes will be combined)
					undocreated = true;
				}
			}
		}

		// Called before an action is performed. This does not make an undo level
		private void PreActionNoChange()
		{
			actionresult = new VisualActionResult();
			singleselection = false;
			undocreated = false;
		}
		
		// This is called after an action is performed
		private void PostAction()
		{
			if(!string.IsNullOrEmpty(actionresult.displaystatus))
				General.Interface.DisplayStatus(StatusType.Action, actionresult.displaystatus);

			// Reset changed flags
			foreach(KeyValuePair<Sector, VisualSector> vs in allsectors)
			{
				BaseVisualSector bvs = (BaseVisualSector)vs.Value;
				foreach(VisualFloor vf in bvs.ExtraFloors) vf.Changed = false;
				foreach(VisualCeiling vc in bvs.ExtraCeilings) vc.Changed = false;
				foreach(VisualFloor vf in bvs.ExtraBackFloors) vf.Changed = false; //mxd
				foreach(VisualCeiling vc in bvs.ExtraBackCeilings) vc.Changed = false; //mxd
				bvs.Floor.Changed = false;
				bvs.Ceiling.Changed = false;
			}
			
			selectionchanged = false;

			// Only clear the selection if anything is selected, since it can be very time consuming on huge maps
			if (singleselection && selectedobjects.Count > 0) ClearSelection();
			
			UpdateChangedObjects();
			ShowTargetInfo();
		}
		
		// This sets the result for an action
		public void SetActionResult(VisualActionResult result)
		{
			actionresult = result;
		}

		// This sets the result for an action
		public void SetActionResult(string displaystatus)
		{
			actionresult = new VisualActionResult {displaystatus = displaystatus};
		}
		
		// This creates an undo, when only a single selection is made
		// When a multi-selection is made, the undo is created by the PreAction function
		public int CreateUndo(string description, int group, int grouptag)
		{
			if(!undocreated)
			{
				undocreated = true;

				if(singleselection)
					return General.Map.UndoRedo.CreateUndo(description, this, group, grouptag);
				return General.Map.UndoRedo.CreateUndo(description, this, UndoGroup.None, 0);
			}

			return 0;
		}

		// This creates an undo, when only a single selection is made
		// When a multi-selection is made, the undo is created by the PreAction function
		public int CreateUndo(string description)
		{
			return CreateUndo(description, UndoGroup.None, 0);
		}

		// This makes a list of the selected object
		private void RebuildSelectedObjectsList()
		{
			// Make list of selected objects
			selectedobjects = new List<IVisualEventReceiver>();
			foreach(KeyValuePair<Sector, VisualSector> vs in allsectors)
			{
				if(vs.Value != null)
				{
					BaseVisualSector bvs = (BaseVisualSector)vs.Value;
					if((bvs.Floor != null) && bvs.Floor.Selected) selectedobjects.Add(bvs.Floor);
					if((bvs.Ceiling != null) && bvs.Ceiling.Selected) selectedobjects.Add(bvs.Ceiling);
					
					// Also check extra floors
					if (bvs.ExtraFloors.Count > 0)
						foreach (VisualFloor vf in bvs.ExtraFloors)
							if (vf.Selected) selectedobjects.Add(vf);

					if (bvs.ExtraBackFloors.Count > 0)
						foreach (VisualFloor vf in bvs.ExtraBackFloors)
							if (vf.Selected) selectedobjects.Add(vf);

					// Also check extra ceilings
					if (bvs.ExtraCeilings.Count > 0)
						foreach (VisualCeiling vc in bvs.ExtraCeilings)
							if (vc.Selected) selectedobjects.Add(vc);

					if (bvs.ExtraBackCeilings.Count > 0)
						foreach (VisualCeiling vc in bvs.ExtraBackCeilings)
							if (vc.Selected) selectedobjects.Add(vc);

					foreach (Sidedef sd in vs.Key.Sidedefs)
					{
						List<VisualGeometry> sidedefgeos = bvs.GetSidedefGeometry(sd);
						foreach(VisualGeometry sdg in sidedefgeos)
						{
							if(sdg.Selected) selectedobjects.Add((IVisualEventReceiver)sdg);
						}
					}
				}
			}

			foreach(KeyValuePair<Thing, VisualThing> vt in allthings)
			{
				if(vt.Value != null)
				{
					BaseVisualThing bvt = (BaseVisualThing)vt.Value;
					if(bvt.Selected) selectedobjects.Add(bvt);
				}
			}

			//mxd
			if(General.Map.UDMF && General.Settings.GZShowVisualVertices) 
			{
				foreach(KeyValuePair<Vertex, VisualVertexPair> pair in vertices) 
				{
					if(pair.Value.CeilingVertex.Selected)
						selectedobjects.Add((BaseVisualVertex)pair.Value.CeilingVertex);
					if(pair.Value.FloorVertex.Selected)
						selectedobjects.Add((BaseVisualVertex)pair.Value.FloorVertex);
				}
			}

			if (General.Map.UDMF)
			{
				foreach (KeyValuePair<Sector, List<VisualSlope>> kvp in allslopehandles)
				{
					foreach (VisualSlope handle in kvp.Value)
						if (handle.Selected) selectedobjects.Add((VisualSidedefSlope)handle);
				}
			}

			//mxd
			UpdateSelectionInfo();
		}

		//mxd. Need this to apply changes to 3d-floor even if control sector doesn't exist as BaseVisualSector
		internal BaseVisualSector CreateBaseVisualSector(Sector s) 
		{
			BaseVisualSector vs = new BaseVisualSector(this, s);
			allsectors.Add(s, vs);
			return vs;
		}

		// This creates a visual sector
		protected override VisualSector CreateVisualSector(Sector s)
		{
			BaseVisualSector vs = new BaseVisualSector(this, s);
			allsectors.Add(s, vs); //mxd
			return vs;
		}

		internal VisualSlope CreateVisualSlopeHandle(SectorLevel level, Sidedef sd, bool up)
		{
			VisualSidedefSlope handle = new VisualSidedefSlope(this, level, sd, up);

			if (!allslopehandles.ContainsKey(sd.Sector))
				allslopehandles.Add(sd.Sector, new List<VisualSlope>());

			allslopehandles[sd.Sector].Add(handle);

			return handle;
		}

		// This creates a visual thing
		protected override VisualThing CreateVisualThing(Thing t)
		{
			BaseVisualThing vt = new BaseVisualThing(this, t);
			return vt.Setup() ? vt : null;
		}

		// This locks the target so that it isn't changed until unlocked
		public void LockTarget()
		{
			locktarget = true;
		}
		
		// This unlocks the target so that is changes to the aimed geometry again
		public void UnlockTarget()
		{
			locktarget = false;
		}
		
		// This picks a new target, if not locked
		private void PickTargetUnlocked()
		{
			if(!locktarget) PickTarget();
		}
		
		// This picks a new target
		private void PickTarget()
		{
			// Find the object we are aiming at
			Vector3D start = General.Map.VisualCamera.Position;
			Vector3D delta = General.Map.VisualCamera.Target - General.Map.VisualCamera.Position;
			delta = delta.GetFixedLength(General.Settings.ViewDistance * PICK_RANGE);
			VisualPickResult newtarget = PickObject(start, start + delta);
			
			// Should we update the info on panels?
			bool updateinfo = (newtarget.picked != target.picked);

			if (updateinfo)
			{
				if (newtarget.picked is VisualSidedefSlope)
				{
					// Get the smart pivot handle for the targeted slope handle, so that it can be drawn
					VisualSidedefSlope handle = VisualSidedefSlope.GetSmartPivotHandle((VisualSidedefSlope)newtarget.picked, this);
					if (handle != null)
						handle.SmartPivot = true;
				}
				else if(target.picked is VisualSidedefSlope)
				{

					// Clear smart pivot handles, otherwise it will keep being displayed
					foreach (KeyValuePair<Sector, List<VisualSlope>> kvp in allslopehandles)
						foreach (VisualSidedefSlope checkhandle in kvp.Value)
							checkhandle.SmartPivot = false;
				}
			}

			// Apply new target
			target = newtarget;

			// Show target info
			if (updateinfo)
				ShowTargetInfo();
		}

		// This shows the picked target information
		public void ShowTargetInfo()
		{
			// Any result?
			if(target.picked != null)
			{
				// Geometry picked?
				if(target.picked is VisualGeometry)
				{
					VisualGeometry pickedgeo = (VisualGeometry)target.picked;
					
					// Sidedef?
					if(pickedgeo is BaseVisualGeometrySidedef)
					{
						BaseVisualGeometrySidedef pickedsidedef = (BaseVisualGeometrySidedef)pickedgeo;
						General.Interface.ShowLinedefInfo(pickedsidedef.GetControlLinedef(), pickedsidedef.Sidedef); //mxd
					}
					// Sector?
					else if(pickedgeo is BaseVisualGeometrySector)
					{
						BaseVisualGeometrySector pickedsector = (BaseVisualGeometrySector)pickedgeo;
						bool isceiling = (pickedsector is VisualCeiling); //mxd
						General.Interface.ShowSectorInfo(pickedsector.Level.sector, isceiling, !isceiling);
					}
					else
					{
						General.Interface.HideInfo();
					}
				} 
				// Thing picked?
				else if(target.picked is VisualThing) 
				{ 
					VisualThing pickedthing = (VisualThing)target.picked;
					General.Interface.ShowThingInfo(pickedthing.Thing);
				} 
				//mxd. Vertex picked?
				else if(target.picked is VisualVertex)
				{
					VisualVertex pickedvert = (VisualVertex)target.picked;
					General.Interface.ShowVertexInfo(pickedvert.Vertex);
				}
			}
			else
			{
				General.Interface.HideInfo();
			}
		}
		
		// This updates the VisualSectors and VisualThings that have their Changed property set
		private void UpdateChangedObjects()
		{
			foreach(KeyValuePair<Sector, VisualSector> vs in allsectors)
			{
				if(vs.Value != null)
				{
					BaseVisualSector bvs = (BaseVisualSector)vs.Value;
					if(bvs.Changed)
					{
						bvs.Rebuild();

						// Also update slope handles
						if (allslopehandles.ContainsKey(vs.Key))
							foreach (VisualSidedefSlope handle in allslopehandles[vs.Key])
								handle.Update();
					}
				}
			}

			foreach(KeyValuePair<Thing, VisualThing> vt in allthings)
			{
				if(vt.Value != null)
				{
					BaseVisualThing bvt = (BaseVisualThing)vt.Value;
					if(bvt.Changed) bvt.Rebuild();
				}
			}

			//mxd
			if(General.Map.UDMF) 
			{
				foreach(KeyValuePair<Vertex, VisualVertexPair> pair in vertices)
					pair.Value.Update();
			}

			//mxd. Update event lines (still better than updating them on every frame redraw)
			renderer.SetEventLines(LinksCollector.GetHelperShapes(General.Map.ThingsFilter.VisibleThings, blockmap));
		}

		//mxd
		protected override void MoveSelectedThings(Vector2D direction, bool absoluteposition) 
		{
			List<VisualThing> visualthings = GetSelectedVisualThings(true);
			if(visualthings.Count == 0) return;

			PreAction(UndoGroup.ThingMove);

			Vector3D[] coords = new Vector3D[visualthings.Count];
			for(int i = 0; i < visualthings.Count; i++)
				coords[i] = visualthings[i].Thing.Position;

			//move things...
			Vector3D[] translatedcoords = TranslateCoordinates(coords, direction, absoluteposition);
			for(int i = 0; i < visualthings.Count; i++) 
			{
				BaseVisualThing t = (BaseVisualThing)visualthings[i];
				t.OnMove(translatedcoords[i]);
			}

			// Things may've changed sectors...
			FillBlockMap();

			PostAction();
		}

		//mxd
		private static Vector3D[] TranslateCoordinates(Vector3D[] coordinates, Vector2D direction, bool absolutePosition) 
		{
			if(coordinates.Length == 0) return null;

			direction.x = Math.Round(direction.x);
			direction.y = Math.Round(direction.y);

			Vector3D[] translatedCoords = new Vector3D[coordinates.Length];

			//move things...
			if(!absolutePosition) //...relatively (that's easy)
			{ 
				int camAngle = (int)Math.Round(Angle2D.RadToDeg(General.Map.VisualCamera.AngleXY));
				int sector = General.ClampAngle(camAngle - 45) / 90;
				direction = direction.GetRotated(sector * Angle2D.PIHALF);

				for(int i = 0; i < coordinates.Length; i++)
					translatedCoords[i] = coordinates[i] + new Vector3D(direction);

				return translatedCoords;
			}

			//...to specified location preserving relative positioning (that's harder)
			if(coordinates.Length == 1) //just move it there
			{
				translatedCoords[0] = new Vector3D(direction.x, direction.y, coordinates[0].z);
				return translatedCoords;
			}

			//we need some reference
			double minX = coordinates[0].x;
			double maxX = minX;
			double minY = coordinates[0].y;
			double maxY = minY;

			//get bounding coordinates for selected things
			for(int i = 1; i < coordinates.Length; i++) 
			{
				if(coordinates[i].x < minX)
					minX = coordinates[i].x;
				else if(coordinates[i].x > maxX)
					maxX = coordinates[i].x;

				if(coordinates[i].y < minY)
					minY = coordinates[i].y;
				else if(coordinates[i].y > maxY)
					maxY = coordinates[i].y;
			}

			Vector2D selectionCenter = new Vector2D(minX + (maxX - minX) / 2, minY + (maxY - minY) / 2);

			//move them
			for(int i = 0; i < coordinates.Length; i++)
				translatedCoords[i] = new Vector3D(Math.Round(direction.x - (selectionCenter.x - coordinates[i].x)), Math.Round(direction.y - (selectionCenter.y - coordinates[i].y)), Math.Round(coordinates[i].z));

			return translatedCoords;
		}

		//mxd
		public override void UpdateSelectionInfo() 
		{
			// Collect info
			int numWalls = 0;
			int numFloors = 0;
			int numCeilings = 0;
			int numThings = 0;
			int numVerts = 0;

			foreach(IVisualEventReceiver obj in selectedobjects) 
			{
				if(!obj.Selected) continue;

				if(obj is BaseVisualThing) numThings++;
				else if(obj is BaseVisualVertex) numVerts++;
				else if(obj is VisualCeiling) numCeilings++;
				else if(obj is VisualFloor)	numFloors++;
				else if(obj is VisualMiddleSingle || obj is VisualMiddleDouble || obj is VisualLower || obj is VisualUpper || obj is VisualMiddle3D || obj is VisualMiddleBack)
					numWalls++;
			}

			List<string> results = new List<string>();
			if(numWalls > 0) results.Add(numWalls + (numWalls > 1 ? " sidedefs" : " sidedef"));
			if(numFloors > 0) results.Add(numFloors + (numFloors > 1 ? " floors" : " floor"));
			if(numCeilings > 0) results.Add(numCeilings + (numCeilings > 1 ? " ceilings" : " ceiling"));
			if(numThings > 0) results.Add(numThings + (numThings > 1 ? " things" : " thing"));
			if(numVerts > 0) results.Add(numVerts + (numVerts > 1 ? " vertices" : " vertex"));

			// Display results
			string result = string.Empty;
			if(results.Count > 0) 
			{
				result = string.Join(", ", results.ToArray());
				int pos = result.LastIndexOf(",", StringComparison.Ordinal);
				if(pos != -1) result = result.Remove(pos, 1).Insert(pos, " and");
				result += " selected.";
			}

			General.Interface.DisplayStatus(StatusType.Selection, result);
		}

		//mxd
		internal void StartRealtimeInterfaceUpdate(SelectionType selectiontype)
		{
			switch(selectiontype)
			{
				case SelectionType.All:
				case SelectionType.Linedefs:
				case SelectionType.Sectors:
					General.Interface.OnEditFormValuesChanged += Interface_OnSectorEditFormValuesChanged;
					break;
				case SelectionType.Things:
					General.Interface.OnEditFormValuesChanged += Interface_OnThingEditFormValuesChanged;
					break;
				default:
					General.Interface.OnEditFormValuesChanged += Interface_OnEditFormValuesChanged;
					break;
			}
		}

		//mxd
		internal void StopRealtimeInterfaceUpdate(SelectionType selectiontype)
		{
			switch(selectiontype)
			{
				case SelectionType.All:
				case SelectionType.Linedefs:
				case SelectionType.Sectors:
					General.Interface.OnEditFormValuesChanged -= Interface_OnSectorEditFormValuesChanged;
					break;
				case SelectionType.Things:
					General.Interface.OnEditFormValuesChanged -= Interface_OnThingEditFormValuesChanged;
					break;
				default:
					General.Interface.OnEditFormValuesChanged -= Interface_OnEditFormValuesChanged;
					break;
			}
		}

		private List<VisualSidedefSlope> GetSlopeHandlePair()
		{
			List<VisualSidedefSlope> handles = GetSelectedSlopeHandles();

			// No handles selected, try to slope between highlighted handle and it smart pivot
			if (handles.Count == 0 && HighlightedTarget is VisualSidedefSlope)
			{
				VisualSidedefSlope handle = VisualSidedefSlope.GetSmartPivotHandle((VisualSidedefSlope)HighlightedTarget, this);
				if (handle == null)
				{
					General.Interface.DisplayStatus(StatusType.Warning, "Couldn't find a smart pivot handle.");
					return handles;
				}

				handles.Add((VisualSidedefSlope)HighlightedTarget);
				handles.Add(handle);
			}
			// One handle selected, try to slope between it and the highlighted handle or the selected one's smart pivot
			else if (handles.Count == 1)
			{
				if (HighlightedTarget == handles[0] || !(HighlightedTarget is VisualSidedefSlope))
				{
					VisualSidedefSlope handle;

					if (HighlightedTarget is VisualSidedefSlope)
						handle = VisualSidedefSlope.GetSmartPivotHandle((VisualSidedefSlope)HighlightedTarget, this);
					else
						handle = VisualSidedefSlope.GetSmartPivotHandle(handles[0], this);

					if (handle == null)
					{
						General.Interface.DisplayStatus(StatusType.Warning, "Couldn't find a smart pivot handle.");
						return handles;
					}

					handles.Add(handle);
				}
				else
				{
					handles.Add((VisualSidedefSlope)HighlightedTarget);
				}
			}
			// Return if more than two handles are selected
			else if (handles.Count > 2)
			{
				General.Interface.DisplayStatus(StatusType.Warning, "Too many slope handles selected.");
				return handles;
			}
			// Everything else
			else if (handles.Count != 2)
			{
				General.Interface.DisplayStatus(StatusType.Warning, "No slope handles selected or highlighted.");
				return handles;
			}

			return handles;
		}
		
		#endregion

		#region ================== Extended Methods

		// This requests a sector's extra data
		internal SectorData GetSectorData(Sector s)
		{
			// Make fresh sector data when it doesn't exist yet
			if(!sectordata.ContainsKey(s))
				sectordata[s] = new SectorData(this, s);
			
			return sectordata[s];
		}

		//mxd. This requests a sector's extra data or null if given sector doesn't have it
		internal SectorData GetSectorDataEx(Sector s)
		{
			return (sectordata.ContainsKey(s) ? sectordata[s] : null);
		}

		// This requests a things's extra data
		internal ThingData GetThingData(Thing t)
		{
			// Make fresh sector data when it doesn't exist yet
			if(!thingdata.ContainsKey(t))
				thingdata[t] = new ThingData(this, t);
			
			return thingdata[t];
		}

		//mxd
		internal VertexData GetVertexData(Vertex v) 
		{
			if(!vertexdata.ContainsKey(v))
				vertexdata[v] = new VertexData(this, v);
			return vertexdata[v];
		}

		internal BaseVisualVertex GetVisualVertex(Vertex v, bool floor) 
		{
			if(!vertices.ContainsKey(v))
				vertices.Add(v, new VisualVertexPair(new BaseVisualVertex(this, v, false), new BaseVisualVertex(this, v, true)));

			return (floor ? (BaseVisualVertex)vertices[v].FloorVertex : (BaseVisualVertex)vertices[v].CeilingVertex);
		}

		//mxd
		internal void UpdateVertexHandle(Vertex v) 
		{
			if(!vertices.ContainsKey(v))
				vertices.Add(v, new VisualVertexPair(new BaseVisualVertex(this, v, false), new BaseVisualVertex(this, v, true)));
			else
				vertices[v].Changed = true;
		}
		
		// This rebuilds the sector data
		// This requires that the blockmap is up-to-date!
		internal void RebuildElementData()
		{
			HashSet<Sector> effectsectors = null; //mxd
			List<Linedef>[] slopelinedefpass = new List<Linedef>[] { new List<Linedef>(), new List<Linedef>() };
			List<Thing>[] slopethingpass = new List<Thing>[] { new List<Thing>(), new List<Thing>() };

			if (!General.Settings.EnhancedRenderingEffects) //mxd
			{
				// Store all sectors with effects
				if(sectordata != null && sectordata.Count > 0) 
					effectsectors = new HashSet<Sector>(sectordata.Keys);

				// Remove all vertex handles from selection
				if(vertices != null && vertices.Count > 0) 
				{
                    for (int i = 0; i < selectedobjects.Count; i++)
                    {
                        if (selectedobjects[i] is BaseVisualVertex)
                        {
                            RemoveSelectedObject(selectedobjects[i]);
                            i--;
                        }
                    }
				}
			}

			Dictionary<int, List<Sector>> sectortags = new Dictionary<int, List<Sector>>();
			Dictionary<int, List<Linedef>> linetags = new Dictionary<int, List<Linedef>>();
			sectordata = new Dictionary<Sector, SectorData>(General.Map.Map.Sectors.Count);
			thingdata = new Dictionary<Thing, ThingData>(General.Map.Map.Things.Count);

			//mxd. Rebuild all sectors with effects
			if(effectsectors != null) 
			{
				foreach(Sector s in effectsectors)
				{
					if(!VisualSectorExists(s)) continue;

					// The visual sector associated is now outdated
					BaseVisualSector vs = (BaseVisualSector)GetVisualSector(s);
					vs.UpdateSectorGeometry(true);
				}
			}

			if(General.Map.UDMF) 
			{
				vertexdata = new Dictionary<Vertex, VertexData>(General.Map.Map.Vertices.Count); //mxd
				vertices.Clear();
			}

			if(!General.Settings.EnhancedRenderingEffects) return; //mxd
			
			// Find all sector who's tag is not 0 and hash them so that we can find them quickly
			foreach(Sector s in General.Map.Map.Sectors)
			{
				foreach(int tag in s.Tags)
				{
					if(tag == 0) continue;
					if(!sectortags.ContainsKey(tag)) sectortags[tag] = new List<Sector>();
					sectortags[tag].Add(s);
				}
			}

			// Find interesting linedefs (such as line slopes)
			// This also determines which slope lines belong to pass one and pass two. See https://zdoom.org/wiki/Slope
			foreach (Linedef l in General.Map.Map.Linedefs)
			{
				// Builds a cache of linedef ids/tags. Used for slope things. Use linedef tags in UDMF
				if(General.Map.UDMF)
				{
					foreach(int tag in l.Tags)
					{
						if (!linetags.ContainsKey(tag)) linetags[tag] = new List<Linedef>();
						linetags[tag].Add(l);
					}
				}

				//mxd. Rewritten to use action ID instead of number
				if (l.Action == 0 || !General.Map.Config.LinedefActions.ContainsKey(l.Action)) continue;

				switch(General.Map.Config.LinedefActions[l.Action].Id.ToLowerInvariant())
				{
					// ========== Line Set Identification (121) (see https://zdoom.org/wiki/Line_SetIdentification) ==========
					// Builds a cache of linedef ids/tags. Used for slope things. Only used for Hexen format
					case "line_setidentification":
						int tag = l.Args[0] + l.Args[4] * 256;
						if (!linetags.ContainsKey(tag)) linetags[tag] = new List<Linedef>();
						linetags[tag].Add(l);
						break;

					// ========== Plane Align (181) (see http://zdoom.org/wiki/Plane_Align) ==========
					case "plane_align":
						slopelinedefpass[0].Add(l);
						break;

					// ========== Plane Copy (118) (mxd) (see http://zdoom.org/wiki/Plane_Copy) ==========
					case "plane_copy":
						slopelinedefpass[1].Add(l);
						break;

					// ========== Sector 3D floor (160) (see http://zdoom.org/wiki/Sector_Set3dFloor) ==========
					case "sector_set3dfloor":
						if(l.Front != null)
						{
							//mxd. Added hi-tag/line ID check 
							int sectortag = (General.Map.UDMF || (l.Args[1] & (int)Effect3DFloor.FloorTypes.HiTagIsLineID) != 0) ? l.Args[0] : l.Args[0] + (l.Args[4] << 8);
							if(sectortags.ContainsKey(sectortag)) 
							{
								List<Sector> sectors = sectortags[sectortag];
								foreach(Sector s in sectors) 
								{
									SectorData sd = GetSectorData(s);