LinedefsMode.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.Drawing;
using System.Linq;
using System.Windows.Forms;
using CodeImp.DoomBuilder.Actions;
using CodeImp.DoomBuilder.BuilderModes.Interface;
using CodeImp.DoomBuilder.Data;
using CodeImp.DoomBuilder.Editing;
using CodeImp.DoomBuilder.Geometry;
using CodeImp.DoomBuilder.Map;
using CodeImp.DoomBuilder.Rendering;
using CodeImp.DoomBuilder.Windows;

#endregion

namespace CodeImp.DoomBuilder.BuilderModes
{
	[EditMode(DisplayName = "Linedefs Mode",
			  SwitchAction = "linedefsmode",	// Action name used to switch to this mode
			  ButtonImage = "LinesMode.png",	// Image resource name for the button
			  ButtonOrder = int.MinValue + 100,	// Position of the button (lower is more to the left)
			  ButtonGroup = "000_editing",
			  UseByDefault = true,
			  SafeStartMode = true)]

	public class LinedefsMode : BaseClassicMode
	{
		#region ================== Constants

		private const int MAX_LINEDEF_LABELS = 256; //mxd

		#endregion

		#region ================== Variables

		// Highlighted item
		private Linedef highlighted;
		private readonly Association highlightasso;
		private Vector2D insertpreview = new Vector2D(float.NaN, float.NaN); //mxd

		//mxd. Text labels
		private Dictionary<Linedef, SelectionLabel> labels;
		private Dictionary<Sector, TextLabel[]> sectorlabels;
		private Dictionary<Sector, string[]> sectortexts;
		
		// Interface
		new private bool editpressed;
		private bool selectionfromhighlight; //mxd

		// The blockmap makes is used to make finding lines faster
		BlockMap<BlockEntry> blockmap;

		// Stores sizes of the text for text labels so that they only have to be computed once
		private Dictionary<string, float> textlabelsizecache;

		#endregion

		#region ================== Properties

		public override object HighlightedObject { get { return highlighted; } }
		
		#endregion

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

		public LinedefsMode()
		{
			//mxd. Associations now requre initializing...
			highlightasso = new Association(renderer);

			textlabelsizecache = new Dictionary<string, float>();
		}

		//mxd
		public override void Dispose()
		{
			// Not already disposed?
			if(!isdisposed)
			{
				// Dispose old labels
				if(labels != null) foreach(SelectionLabel l in labels.Values) l.Dispose();
				if(sectorlabels != null)
				{
					foreach(TextLabel[] lbl in sectorlabels.Values)
						foreach(TextLabel l in lbl) l.Dispose();
				}

				// Dispose base
				base.Dispose();
			}
		}

		#endregion

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

		// This highlights a new item
		private void Highlight(Linedef l)
		{
			bool completeredraw = false;

			// Often we can get away by simply undrawing the previous
			// highlight and drawing the new highlight. But if associations
			// are or were drawn we need to redraw the entire display.
			
			if(highlighted != null)
			{
				//mxd. Update label color?
				if(labels.ContainsKey(highlighted))
				{
					labels[highlighted].Color = General.Colors.Highlight;
					completeredraw = true;
				}

				// Previous association highlights something?
				if (!highlightasso.IsEmpty) completeredraw = true;
			}
			
			// Set highlight association
			if(l != null)
			{
				//mxd. Update label color?
				if(labels.ContainsKey(l))
				{
					labels[l].Color = General.Colors.Selection;
					completeredraw = true;
				}

				// New association highlights something?
				highlightasso.Set(l);

				// Only need a complete redraw if the association contains elements
				if (!highlightasso.IsEmpty) completeredraw = true;
			}
			else
			{
				// Only need a complete redraw if the old association wasn't empty
				if (!highlightasso.IsEmpty) completeredraw = true;
				highlightasso.Clear();
			}

			// If we're changing associations, then we
			// need to redraw the entire display
			if(completeredraw)
			{
				// Set new highlight and redraw completely
				highlighted = l;
				General.Interface.RedrawDisplay();
			}
			else
			{
				// Update display
				if(renderer.StartPlotter(false))
				{
					// Undraw previous highlight
					Linedef possiblecommentline = l ?? highlighted; //mxd
					if((highlighted != null) && !highlighted.IsDisposed)
					{
						renderer.PlotLinedef(highlighted, renderer.DetermineLinedefColor(highlighted));
						renderer.PlotVertex(highlighted.Start, renderer.DetermineVertexColor(highlighted.Start));
						renderer.PlotVertex(highlighted.End, renderer.DetermineVertexColor(highlighted.End));
					}

					// Set new highlight
					highlighted = l;

					// Render highlighted item
					if((highlighted != null) && !highlighted.IsDisposed)
					{
						renderer.PlotLinedef(highlighted, General.Colors.Highlight);
						renderer.PlotVertex(highlighted.Start, renderer.DetermineVertexColor(highlighted.Start));
						renderer.PlotVertex(highlighted.End, renderer.DetermineVertexColor(highlighted.End));
					}

					// Done with highlight
					renderer.Finish();

					//mxd. Update comment highlight?
					if(General.Map.UDMF && General.Settings.RenderComments
						&& possiblecommentline != null && !possiblecommentline.IsDisposed
						&& renderer.StartOverlay(false))
					{
						RenderComment(possiblecommentline);
						renderer.Finish();
					}

					renderer.Present();
				}
			}

			// Show highlight info
			if((highlighted != null) && !highlighted.IsDisposed)
			{
				General.Interface.ShowLinedefInfo(highlighted);
			}
			else
			{
				General.Interface.Display.HideToolTip(); //mxd
				General.Interface.HideInfo();
			}
		}

		//mxd
		private void AlignTextureToLine(bool alignFloors, bool alignToFrontSide) 
		{
			ICollection<Linedef> lines = General.Map.Map.GetSelectedLinedefs(true);

			if(lines.Count == 0 && highlighted != null && !highlighted.IsDisposed)
				lines.Add(highlighted);

			if(lines.Count == 0) 
			{
				General.Interface.DisplayStatus(StatusType.Warning, "This action requires a selection!");
				return;
			}

			//Create Undo
			string rest = (alignFloors ? "Floors" : "Ceilings") + " to " + (alignToFrontSide ? "Front" : "Back")+ " Side";
			General.Map.UndoRedo.CreateUndo("Align " + rest);
			int counter = 0;

			foreach(Linedef l in lines)
			{
				Sector s = null;

				if(alignToFrontSide) 
				{
					if(l.Front != null && l.Front.Sector != null) s = l.Front.Sector;
				} 
				else 
				{
					if(l.Back != null && l.Back.Sector != null)	s = l.Back.Sector;
				}

				if(s == null) continue;
				counter++;

				s.Fields.BeforeFieldsChange();

				double sourceAngle = Math.Round(General.ClampAngle(alignToFrontSide ? -Angle2D.RadToDeg(l.Angle) + 90 : -Angle2D.RadToDeg(l.Angle) - 90), 1);
				if(!alignToFrontSide) sourceAngle = General.ClampAngle(sourceAngle + 180);

				//update angle
				UniFields.SetFloat(s.Fields, (alignFloors ? "rotationfloor" : "rotationceiling"), sourceAngle, 0.0);

				//update offset
				Vector2D offset = (alignToFrontSide ? l.Start.Position : l.End.Position).GetRotated(Angle2D.DegToRad(sourceAngle));
				ImageData texture = General.Map.Data.GetFlatImage(s.LongFloorTexture);

				if((texture == null) || (texture == General.Map.Data.WhiteTexture) ||
				   (texture.Width <= 0) || (texture.Height <= 0) || !texture.IsImageLoaded) 
				{
					//meh...
				}
				else
				{
					offset.x %= texture.Width / s.Fields.GetValue((alignFloors ? "xscalefloor" : "xscaleceiling"), 1.0);
					offset.y %= texture.Height / s.Fields.GetValue((alignFloors ? "yscalefloor" : "yscaleceiling"), 1.0);
				}

				UniFields.SetFloat(s.Fields, (alignFloors ? "xpanningfloor" : "xpanningceiling"), Math.Round(-offset.x), 0.0);
				UniFields.SetFloat(s.Fields, (alignFloors ? "ypanningfloor" : "ypanningceiling"), Math.Round(offset.y), 0.0);

				//update
				s.UpdateNeeded = true;
				s.UpdateCache();
			}

			General.Interface.DisplayStatus(StatusType.Info, "Aligned " +counter + " " + rest);

			//update
			General.Map.Map.Update();
			General.Interface.RedrawDisplay();
			General.Interface.RefreshInfo();
			General.Map.IsChanged = true;
		}

		//mxd
		private bool IsInSelectionRect(Linedef l, List<Line2D> selectionOutline) 
		{
			if(BuilderPlug.Me.MarqueSelectTouching) 
			{
				bool selected = selectionrect.Contains((float)l.Start.Position.x, (float)l.Start.Position.y) || selectionrect.Contains((float)l.End.Position.x, (float)l.End.Position.y);

				//check intersections with outline
				if(!selected) 
				{
					foreach(Line2D line in selectionOutline) 
					{
						if(Line2D.GetIntersection(l.Line, line)) return true;
					}
				}
				return selected;
			}

			return selectionrect.Contains((float)l.Start.Position.x, (float)l.Start.Position.y) && selectionrect.Contains((float)l.End.Position.x, (float)l.End.Position.y);
		}

		//mxd. Gets map elements inside of selectionoutline and sorts them by distance to targetpoint
		private List<Linedef> GetOrderedSelection(Vector2D targetpoint, List<Line2D> selectionoutline)
		{
			// Gather affected sectors
			List<Linedef> result = new List<Linedef>();
			foreach(Linedef l in General.Map.Map.Linedefs)
			{
				if(IsInSelectionRect(l, selectionoutline)) result.Add(l);
			}

			if(result.Count == 0) return result;

			// Sort by distance to targetpoint
			result.Sort(delegate(Linedef l1, Linedef l2)
			{
				if(l1 == l2) return 0;

				// Get closest distance from l1 to selectstart
				double closest1 = double.MaxValue;
				
				Vector2D pos = l1.Start.Position;
				double curdistance = Vector2D.DistanceSq(pos, targetpoint);
				if(curdistance < closest1) closest1 = curdistance;

				pos = l1.End.Position;
				curdistance = Vector2D.DistanceSq(pos, targetpoint);
				if(curdistance < closest1) closest1 = curdistance;

				// Get closest distance from l2 to selectstart
				double closest2 = double.MaxValue;

				pos = l2.Start.Position;
				curdistance = Vector2D.DistanceSq(pos, targetpoint);
				if(curdistance < closest2) closest2 = curdistance;

				pos = l2.End.Position;
				curdistance = Vector2D.DistanceSq(pos, targetpoint);
				if(curdistance < closest2) closest2 = curdistance;

				// Return closer one
				return (int)(closest1 - closest2);
			});

			return result;
		}

		//mxd. This sets up new labels
		private void SetupSectorLabels()
		{
			// Dispose old labels
			if(sectorlabels != null)
			{
				foreach(TextLabel[] larr in sectorlabels.Values)
					foreach(TextLabel l in larr) l.Dispose();
			}

			// Make text labels for sectors
			sectorlabels = new Dictionary<Sector, TextLabel[]>();
			sectortexts = new Dictionary<Sector, string[]>();
			foreach(Sector s in General.Map.Map.Sectors)
			{
				// Setup labels
				if(s.Tag == 0) continue;

				// Make tag text
				string[] tagdescarr = new string[2];
				if(s.Tags.Count > 1)
				{
					string[] stags = new string[s.Tags.Count];
					for(int i = 0; i < s.Tags.Count; i++) stags[i] = s.Tags[i].ToString();
					tagdescarr[0] = "Tags " + string.Join(", ", stags);
					tagdescarr[1] = "T" + string.Join(",", stags);
				}
				else
				{
					tagdescarr[0] = "Tag " + s.Tag;
					tagdescarr[1] = "T" + s.Tag;
				}

				// Add to collection
				sectortexts.Add(s, tagdescarr);

				TextLabel[] larr = new TextLabel[s.Labels.Count];
				for(int i = 0; i < s.Labels.Count; i++)
				{
					TextLabel l = new TextLabel();
					l.TransformCoords = true;
					l.Location = s.Labels[i].position;
					l.AlignX = TextAlignmentX.Center;
					l.AlignY = TextAlignmentY.Middle;
					l.Color = General.Colors.InfoLine;
					l.BackColor = General.Colors.Background.WithAlpha(128);
					larr[i] = l;
				}

				// Add to collection
				sectorlabels.Add(s, larr);
			}
		}

		//mxd. Also update labels for the selected linedefs
		public override void UpdateSelectionInfo()
		{
			base.UpdateSelectionInfo();
			
			if(labels != null)
			{
				// Dispose old labels
				foreach(SelectionLabel l in labels.Values) l.Dispose();
				
				// Don't show lables for selected-from-highlight item
				if(selectionfromhighlight)
				{
					labels.Clear();
					return;
				}
			}

			// Make text labels for selected linedefs
			ICollection<Linedef> orderedselection = General.Map.Map.GetSelectedLinedefs(true);
			labels = new Dictionary<Linedef, SelectionLabel>(orderedselection.Count);

			// Otherwise significant delays will occure.
			// Also we probably won't care about selection ordering when selecting this many anyway
			if(orderedselection.Count > MAX_LINEDEF_LABELS) return; 

			int index = 0;
			foreach(Linedef linedef in orderedselection)
			{
				SelectionLabel l = new SelectionLabel();
				l.OffsetPosition = true;
				l.Color = (linedef == highlighted ? General.Colors.Selection : General.Colors.Highlight);
				l.BackColor = General.Colors.Background.WithAlpha(192);
				l.TextLabel.Text = (++index).ToString();
				labels.Add(linedef, l);
			}
		}

		/// <summary>
		/// Create a blockmap containing linedefs. This is used to speed up determining the closest line
		/// to the mouse cursor
		/// </summary>
		private void CreateBlockmap()
		{
			RectangleF area = MapSet.CreateArea(General.Map.Map.Vertices);
			blockmap = new BlockMap<BlockEntry>(area);
			blockmap.AddLinedefsSet(General.Map.Map.Linedefs);
		}

		#endregion

		#region ================== Events

		public override void OnHelp()
		{
			General.ShowHelp("e_linedefs.html");
		}

		// Cancel mode
		public override void OnCancel()
		{
			base.OnCancel();

			// Return to this mode
			General.Editing.ChangeMode(new LinedefsMode());
		}

		// Mode engages
		public override void OnEngage()
		{
			base.OnEngage();
			renderer.SetPresentation(Presentation.Standard);
			
			// Add toolbar buttons
			General.Interface.BeginToolbarUpdate(); //mxd
			General.Interface.AddButton(BuilderPlug.Me.MenusForm.CopyProperties);
			General.Interface.AddButton(BuilderPlug.Me.MenusForm.PasteProperties);
			General.Interface.AddButton(BuilderPlug.Me.MenusForm.PastePropertiesOptions); //mxd
			General.Interface.AddButton(BuilderPlug.Me.MenusForm.SeparatorCopyPaste);
			General.Interface.AddButton(BuilderPlug.Me.MenusForm.ViewSelectionNumbers); //mxd
			BuilderPlug.Me.MenusForm.ViewSelectionEffects.Text = "View Sector Tags"; //mxd
			General.Interface.AddButton(BuilderPlug.Me.MenusForm.ViewSelectionEffects); //mxd
			General.Interface.AddButton(BuilderPlug.Me.MenusForm.SeparatorSectors1); //mxd
			if(General.Map.UDMF) //mxd
			{
				General.Interface.AddButton(BuilderPlug.Me.MenusForm.MakeGradientBrightness);
				General.Interface.AddButton(BuilderPlug.Me.MenusForm.GradientInterpolationMenu);
			}
			General.Interface.AddButton(BuilderPlug.Me.MenusForm.CurveLinedefs);
			General.Interface.AddButton(BuilderPlug.Me.MenusForm.MarqueSelectTouching); //mxd
			General.Interface.AddButton(BuilderPlug.Me.MenusForm.SyncronizeThingEditButton); //mxd
			if (General.Map.UDMF)
			{
				General.Interface.AddButton(BuilderPlug.Me.MenusForm.TextureOffsetLock, ToolbarSection.Geometry); //mxd
				General.Interface.AddButton(BuilderPlug.Me.MenusForm.TextureOffset3DFloorLock, ToolbarSection.Geometry);
			}

			//mxd. Update the tooltip
			BuilderPlug.Me.MenusForm.SyncronizeThingEditButton.ToolTipText = "Synchronized Things Editing" + Environment.NewLine + BuilderPlug.Me.MenusForm.SyncronizeThingEditLinedefsItem.ToolTipText;
			General.Interface.EndToolbarUpdate(); //mxd

			// Create the blockmap
			CreateBlockmap();

			// Convert geometry selection to linedefs selection
			General.Map.Map.ConvertSelection(SelectionType.Linedefs);
			UpdateSelectionInfo(); //mxd
			SetupSectorLabels(); //mxd
		}
		
		// Mode disengages
		public override void OnDisengage()
		{
			base.OnDisengage();

			// Remove toolbar buttons
			General.Interface.BeginToolbarUpdate(); //mxd
			General.Interface.RemoveButton(BuilderPlug.Me.MenusForm.CopyProperties);
			General.Interface.RemoveButton(BuilderPlug.Me.MenusForm.PasteProperties);
			General.Interface.RemoveButton(BuilderPlug.Me.MenusForm.PastePropertiesOptions); //mxd
			General.Interface.RemoveButton(BuilderPlug.Me.MenusForm.SeparatorCopyPaste);
			General.Interface.RemoveButton(BuilderPlug.Me.MenusForm.ViewSelectionNumbers); //mxd
			General.Interface.RemoveButton(BuilderPlug.Me.MenusForm.ViewSelectionEffects); //mxd
			General.Interface.RemoveButton(BuilderPlug.Me.MenusForm.SeparatorSectors1); //mxd
			General.Interface.RemoveButton(BuilderPlug.Me.MenusForm.MakeGradientBrightness);
			General.Interface.RemoveButton(BuilderPlug.Me.MenusForm.GradientInterpolationMenu);
			General.Interface.RemoveButton(BuilderPlug.Me.MenusForm.CurveLinedefs);
			General.Interface.RemoveButton(BuilderPlug.Me.MenusForm.MarqueSelectTouching); //mxd
			General.Interface.RemoveButton(BuilderPlug.Me.MenusForm.SyncronizeThingEditButton); //mxd
			General.Interface.RemoveButton(BuilderPlug.Me.MenusForm.TextureOffsetLock); //mxd
			General.Interface.RemoveButton(BuilderPlug.Me.MenusForm.TextureOffset3DFloorLock);
			General.Interface.EndToolbarUpdate(); //mxd

			// Going to EditSelectionMode?
			EditSelectionMode mode = General.Editing.NewMode as EditSelectionMode;
			if(mode != null)
			{
				// Not pasting anything?
				if(!mode.Pasting)
				{
					// No selection made? But we have a highlight!
					if((General.Map.Map.GetSelectedLinedefs(true).Count == 0) && (highlighted != null))
					{
						// Make the highlight the selection
						highlighted.Selected = true;
					}
				}
			}

			// Hide highlight info and tooltip
			General.Interface.HideInfo();
			General.Interface.Display.HideToolTip(); //mxd
		}

		// This redraws the display
		public override void OnRedrawDisplay()
		{
			renderer.RedrawSurface();
			List<Line3D> eventlines = new List<Line3D>(); //mxd

			// Render lines
			if(renderer.StartPlotter(true))
			{
				renderer.PlotLinedefSet(General.Map.Map.Linedefs);
				
				if((highlighted != null) && !highlighted.IsDisposed)
				{
					//BuilderPlug.PlotReverseAssociations(renderer, highlightasso, eventlines);
					highlightasso.Plot();
					renderer.PlotLinedef(highlighted, General.Colors.Highlight);
				}
				renderer.PlotVerticesSet(General.Map.Map.Vertices);
				renderer.Finish();
			}

			// Render things
			if(renderer.StartThings(true))
			{
				renderer.RenderThingSet(General.Map.ThingsFilter.HiddenThings, General.Settings.HiddenThingsAlpha);
				renderer.RenderThingSet(General.Map.ThingsFilter.VisibleThings, General.Settings.ActiveThingsAlpha);
				renderer.Finish();
			}

			// Render selection
			if(renderer.StartOverlay(true))
			{
				if(!selecting) //mxd
				{ 
					if ((highlighted != null) && !highlighted.IsDisposed) highlightasso.Render(); //mxd
				}
				else
				{
					RenderMultiSelection();
				}

				//mxd. Render vertex insert preview
				if(insertpreview.IsFinite())
				{
					double dist = Math.Min(Vector2D.Distance(mousemappos, insertpreview), BuilderPlug.Me.HighlightRange);
					byte alpha = (byte)(255 - (dist / BuilderPlug.Me.HighlightRange) * 128);
					float vsize = (renderer.VertexSize + 1.0f) / renderer.Scale;
					renderer.RenderRectangleFilled(new RectangleF((float)(insertpreview.x - vsize), (float)(insertpreview.y - vsize), vsize * 2.0f, vsize * 2.0f), General.Colors.InfoLine.WithAlpha(alpha), true);
				}

				//mxd. Render sector tag labels
				if(BuilderPlug.Me.ViewSelectionEffects)
				{
					List<ITextLabel> torender = new List<ITextLabel>(sectorlabels.Count);
					foreach(KeyValuePair<Sector, string[]> group in sectortexts)
					{
						// Pick which text variant to use
						TextLabel[] labelarray = sectorlabels[group.Key];
						for(int i = 0; i < group.Key.Labels.Count; i++)
						{
							TextLabel l = labelarray[i];

							// Render only when enough space for the label to see
							if (!textlabelsizecache.ContainsKey(group.Value[0]))
								textlabelsizecache[group.Value[0]] = General.Interface.MeasureString(group.Value[0], l.Font).Width;

							float requiredsize = textlabelsizecache[group.Value[0]] / 2 / renderer.Scale;

							if (requiredsize > group.Key.Labels[i].radius)
							{
								if (!textlabelsizecache.ContainsKey(group.Value[1]))
									textlabelsizecache[group.Value[1]] = General.Interface.MeasureString(group.Value[1], l.Font).Width;

								requiredsize = textlabelsizecache[group.Value[1]] / 2 / renderer.Scale;

								string newtext;

								if (requiredsize > group.Key.Labels[i].radius)
									newtext = (requiredsize > group.Key.Labels[i].radius * 4 ? string.Empty : "+");
								else
									newtext = group.Value[1];

								if (l.Text != newtext)
									l.Text = newtext;
							}
							else
							{
								if (group.Value[0] != l.Text)
									l.Text = group.Value[0];
							}

							if(!string.IsNullOrEmpty(l.Text)) torender.Add(l);
						}
					}

					// Render labels
					renderer.RenderText(torender);
				}

				//mxd. Render selection labels
				if(BuilderPlug.Me.ViewSelectionNumbers)
				{
					List<ITextLabel> torender = new List<ITextLabel>(labels.Count);
					foreach(KeyValuePair<Linedef, SelectionLabel> group in labels)
					{
						// Render only when enough space for the label to see
						group.Value.Move(group.Key.Start.Position, group.Key.End.Position);
						float requiredsize = (group.Value.TextSize.Width) / renderer.Scale;
						if(group.Key.Length > requiredsize)
						{
							torender.Add(group.Value.TextLabel);
						}
					}

					renderer.RenderText(torender);
				}

				//mxd. Render comments
				if(General.Map.UDMF && General.Settings.RenderComments) foreach(Linedef l in General.Map.Map.Linedefs) RenderComment(l);

				renderer.Finish();
			}

			renderer.Present();
		}

		// Selection
		protected override void OnSelectBegin()
		{
			// Item highlighted?
			if((highlighted != null) && !highlighted.IsDisposed)
			{
				// Update display
				if(renderer.StartPlotter(false))
				{
					// Redraw highlight to show selection
					renderer.PlotLinedef(highlighted, renderer.DetermineLinedefColor(highlighted));
					renderer.PlotVertex(highlighted.Start, renderer.DetermineVertexColor(highlighted.Start));
					renderer.PlotVertex(highlighted.End, renderer.DetermineVertexColor(highlighted.End));
					renderer.Finish();
					renderer.Present();
				}
			}

			base.OnSelectBegin();
		}

		// End selection
		protected override void OnSelectEnd()
		{
			// Not stopping from multiselection?
			if(!selecting)
			{
				// Item highlighted?
				if((highlighted != null) && !highlighted.IsDisposed)
				{
					//mxd. Flip selection
					highlighted.Selected = !highlighted.Selected;
					UpdateSelectionInfo(); //mxd

					//mxd. Full redraw when labels were changed
					if(BuilderPlug.Me.ViewSelectionNumbers)
					{
						General.Interface.RedrawDisplay();
					}
					// Update display
					else if(renderer.StartPlotter(false))
					{
						// Render highlighted item
						renderer.PlotLinedef(highlighted, General.Colors.Highlight);
						renderer.PlotVertex(highlighted.Start, renderer.DetermineVertexColor(highlighted.Start));
						renderer.PlotVertex(highlighted.End, renderer.DetermineVertexColor(highlighted.End));
						renderer.Finish();
						renderer.Present();
					}
				} 
				else if(BuilderPlug.Me.AutoClearSelection && General.Map.Map.SelectedLinedefsCount > 0) //mxd
				{
					General.Map.Map.ClearSelectedLinedefs();
					UpdateSelectionInfo(); //mxd
					General.Interface.RedrawDisplay();
				}
			}

			base.OnSelectEnd();
		}
		
		// Start editing
		protected override void OnEditBegin()
		{
			// Item highlighted?
			if((highlighted != null) && !highlighted.IsDisposed)
			{
				// Edit pressed in this mode
				editpressed = true;

				// Highlighted item not selected?
				if(!highlighted.Selected && (BuilderPlug.Me.AutoClearSelection || (General.Map.Map.SelectedLinedefsCount == 0)))
				{
					// Make this the only selection
					selectionfromhighlight = true; //mxd
					General.Map.Map.ClearSelectedLinedefs();
					highlighted.Selected = true;
					UpdateSelectionInfo(); //mxd
					General.Interface.RedrawDisplay();
				}

				// Update display
				if(renderer.StartPlotter(false))
				{
					// Redraw highlight to show selection
					renderer.PlotLinedef(highlighted, renderer.DetermineLinedefColor(highlighted));
					renderer.PlotVertex(highlighted.Start, renderer.DetermineVertexColor(highlighted.Start));
					renderer.PlotVertex(highlighted.End, renderer.DetermineVertexColor(highlighted.End));
					renderer.Finish();
					renderer.Present();
				}
			}
			else if(!selecting && BuilderPlug.Me.AutoDrawOnEdit) //mxd. We don't want to draw while multiselecting
			{
				// Start drawing mode
				DrawGeometryMode drawmode = new DrawGeometryMode();
				bool snaptogrid = General.Interface.ShiftState ^ General.Interface.SnapToGrid;
				bool snaptonearest = General.Interface.CtrlState ^ General.Interface.AutoMerge;
				DrawnVertex v = DrawGeometryMode.GetCurrentPosition(mousemappos, snaptonearest, snaptogrid, false, false, renderer, new List<DrawnVertex>());

				if(drawmode.DrawPointAt(v))
					General.Editing.ChangeMode(drawmode);
				else
					General.Interface.DisplayStatus(StatusType.Warning, "Failed to draw point: outside of map boundaries.");
			}
			
			base.OnEditBegin();
		}
		
		// Done editing
		protected override void OnEditEnd()
		{
			// Edit pressed in this mode?
			if(editpressed)
			{
				// Anything selected?
				ICollection<Linedef> selected = General.Map.Map.GetSelectedLinedefs(true);
				if(selected.Count > 0)
				{
					if(General.Interface.IsActiveWindow)
					{
						// Show line edit dialog
						General.Interface.OnEditFormValuesChanged += linedefEditForm_OnValuesChanged;
						DialogResult result = General.Interface.ShowEditLinedefs(selected);
						General.Interface.OnEditFormValuesChanged -= linedefEditForm_OnValuesChanged;

						General.Map.Map.Update();
						
						// When a single line was selected, deselect it now
						if(selected.Count == 1 && selectionfromhighlight) 
						{
							General.Map.Map.ClearSelectedLinedefs();
						} 
						else if(result == DialogResult.Cancel) //mxd. Restore selection...
						{ 
							foreach(Linedef l in selected) l.Selected = true;
						}

						// Update entire display
						SetupSectorLabels();
						General.Map.Renderer2D.UpdateExtraFloorFlag(); //mxd
						UpdateSelectionInfo(); //mxd
						General.Interface.RedrawDisplay();
					}
				}
			}

			editpressed = false;
			selectionfromhighlight = false; //mxd
			base.OnEditEnd();
		}

		private void linedefEditForm_OnValuesChanged(object sender, EventArgs e)
		{
			// This does nothing. It prevents automatic OnRedrawDisplay when closing the linedef edit form
			// Required to prevent crash from issue #298
		}

		//mxd
		public override void OnUndoEnd()
		{
			base.OnUndoEnd();

			// Recreate the blockmap to not include the potentially un-done lines anymore
			CreateBlockmap();

			// Select changed map elements
			if (BuilderPlug.Me.SelectChangedafterUndoRedo)
			{
				General.Map.Map.SelectMarkedGeometry(true, true);
				General.Map.Map.ConvertSelection(SelectionType.Linedefs);
			}

			// If something is highlighted make sure to update the association so that it contains valid data
			if (highlighted != null && !highlighted.IsDisposed)
				highlightasso.Set(highlighted);

			// Update selection info and labels
			UpdateSelectionInfo();
			SetupSectorLabels();
		}

		//mxd
		public override void OnRedoEnd()
		{
			base.OnRedoEnd();

			// Recreate the blockmap to include the potentially re-done linedefs again
			CreateBlockmap();

			// Select changed map elements
			if (BuilderPlug.Me.SelectChangedafterUndoRedo)
			{
				General.Map.Map.SelectMarkedGeometry(true, true);
				General.Map.Map.ConvertSelection(SelectionType.Linedefs);
			}

			// If something is highlighted make sure to update the association so that it contains valid data
			if (highlighted != null && !highlighted.IsDisposed)
				highlightasso.Set(highlighted);

			// Update selection info and labels
			UpdateSelectionInfo();
			SetupSectorLabels();
		}

		public override void OnScriptRunEnd()
		{
			base.OnScriptRunEnd();

			// The script might have added new geometry
			CreateBlockmap();

			UpdateSelectionInfo();

			SetupSectorLabels();

			General.Interface.RedrawDisplay();
		}

		// Mouse moves
		public override void OnMouseMove(MouseEventArgs e)
		{
			base.OnMouseMove(e);

			if(panning) return; //mxd. Skip all this jazz while panning

			//mxd
			if(selectpressed && !editpressed && !selecting) 
			{
				// Check if moved enough pixels for multiselect
				Vector2D delta = mousedownpos - mousepos;
				if((Math.Abs(delta.x) > BuilderPlug.Me.MouseSelectionThreshold) ||
				   (Math.Abs(delta.y) > BuilderPlug.Me.MouseSelectionThreshold)) 
				{
					// Start multiselecting
					StartMultiSelection();
				}
			}
			else if(paintselectpressed && !editpressed && !selecting)  //mxd. Drag-select
			{
				// Find the nearest thing within highlight range
				Linedef l = MapSet.NearestLinedefRange(blockmap, mousemappos, BuilderPlug.Me.HighlightRange / renderer.Scale);

				if(l != null) 
				{
					if(l != highlighted) 
					{
						//toggle selected state
						if(General.Interface.ShiftState ^ BuilderPlug.Me.AdditivePaintSelect)
							l.Selected = true;
						else if(General.Interface.CtrlState)
							l.Selected = false;
						else
							l.Selected = !l.Selected;
						highlighted = l;

						UpdateSelectionInfo(); //mxd

						// Update entire display
						General.Interface.RedrawDisplay();
					}
				} 
				else if(highlighted != null) 
				{
					Highlight(null);

					// Update entire display
					General.Interface.RedrawDisplay();
				}
			}
			else if(e.Button == MouseButtons.None) // Not holding any buttons?
			{
				// Find the nearest linedef within highlight range
				Linedef l = MapSet.NearestLinedefRange(blockmap, mousemappos, BuilderPlug.Me.HighlightRange / renderer.Scale);

				//mxd. Render insert vertex preview
				Linedef sl = MapSet.NearestLinedefRange(blockmap, mousemappos, BuilderPlug.Me.StitchRange / renderer.Scale);
				if (sl != null)
				{
					bool snaptogrid = General.Interface.ShiftState ^ General.Interface.SnapToGrid;
					bool snaptonearest = General.Interface.CtrlState ^ General.Interface.AutoMerge;

					Vector2D v = DrawGeometryMode.GetCurrentPosition(mousemappos, snaptonearest, snaptogrid, false, false, renderer, new List<DrawnVertex>(), blockmap).pos;

					if (v != insertpreview)
					{
						insertpreview = v;

						// Render preview. Do not redraw the whole display for performance reasons
						if(renderer.StartOverlay(true))
						{
							double dist = Math.Min(Vector2D.Distance(mousemappos, insertpreview), BuilderPlug.Me.HighlightRange);
							byte alpha = (byte)(255 - (dist / BuilderPlug.Me.HighlightRange) * 128);
							float vsize = (renderer.VertexSize + 1.0f) / renderer.Scale;
							renderer.RenderRectangleFilled(new RectangleF((float)(insertpreview.x - vsize), (float)(insertpreview.y - vsize), vsize * 2.0f, vsize * 2.0f), General.Colors.InfoLine.WithAlpha(alpha), true);
							renderer.Finish();
							renderer.Present();
						}
					}
				} 
				else if(insertpreview.IsFinite()) 
				{