- Added iterator to TCacheManager

- Added access (CanBeWritten) tracking to TStaticItem
- Moved TLandscape.UpdateStaticsPriorities to TStaticItem.UpdatePriorities
- Moved ULandscape.CompareWorldItems to UWorldItem
- Renamed TSeperatedStaticBlock.RefreshList to RebuildList
- Changed TStaticBlock.Sort to use CompareWorldItems and TList.Sort
- Some code style changes

Client/ULandscape.pas

@@ -88,11 +88,15 @@ type
     constructor Create(AMap: TMapBlock; AStatics: TStaticBlock);
     destructor Destroy; override;
   protected
+    { Fields }
     FMapBlock: TMapBlock;
     FStaticBlock: TStaticBlock;
   public
+    { Fields }
     property Map: TMapBlock read FMapBlock;
     property Static: TStaticBlock read FStaticBlock;
+    { Methods }
+    procedure UpdateBlockAcess;
   end;
   
   TLandscapeChangeEvent = procedure of object;
@@ -148,8 +152,7 @@ type
     procedure GetNormals(AX, AY: Word; var ANormals: TNormals);
     procedure MoveStatic(AStatic: TStaticItem; AX, AY: Word);
     procedure PrepareBlocks(AX1, AY1, AX2, AY2: Word);
-    procedure UpdateStaticsPriority(AStaticItem: TStaticItem;
+    procedure UpdateBlockAccess;
-      APrioritySolver: Integer);
   end;
 
   TScreenState = (ssNormal, ssFiltered, ssGhost);
@@ -185,8 +188,8 @@ type
     procedure Delete(AItem: TWorldItem);
     function Find(AScreenPosition: TPoint): PBlockInfo;
     function GetSerial: Cardinal;
-    function Iterate(var ABlockInfo: PBlockInfo): Boolean;
     function Insert(AItem: TWorldItem): PBlockInfo;
+    function Iterate(var ABlockInfo: PBlockInfo): Boolean;
     procedure Sort;
     procedure UpdateShortcuts;
     { Events }
@@ -215,30 +218,6 @@ begin
   Result := ((AX and $7FFF) shl 15) or (AY and $7FFF);
 end;
 
-function CompareWorldItems(AItem1, AItem2: Pointer): Integer;
-begin
-  if TWorldItem(AItem1).X <> TWorldItem(AItem2).X then
-    Exit(TWorldItem(AItem1).X - TWorldItem(AItem2).X);
-
-  if TWorldItem(AItem1).Y <> TWorldItem(AItem2).Y then
-    Exit(TWorldItem(AItem1).Y - TWorldItem(AItem2).Y);
-
-  Result := TWorldItem(AItem1).Priority - TWorldItem(AItem2).Priority;
-  if Result = 0 then
-  begin
-    if (TObject(AItem1) is TMapCell) and (TObject(AItem2) is TStaticItem) then
-      Result := -1
-    else if (TObject(AItem1) is TStaticItem) and (TObject(AItem2) is TMapCell) then
-      Result := 1;
-  end;
-
-  if Result = 0 then
-    Result := TWorldItem(AItem1).PriorityBonus - TWorldItem(AItem2).PriorityBonus;
-
-  if Result = 0 then
-    Result := TWorldItem(AItem1).PrioritySolver - TWorldItem(AItem2).PrioritySolver;
-end;
-
 { TLandTextureManager }
 
 constructor TLandTextureManager.Create;
@@ -342,6 +321,7 @@ begin
   inherited Create;
   FMapBlock := AMap;
   FStaticBlock := AStatics;
+  UpdateBlockAcess;
 end;
 
 destructor TBlock.Destroy;
@@ -351,6 +331,28 @@ begin
   inherited Destroy;
 end;
 
+procedure TBlock.UpdateBlockAcess;
+var
+  staticItem: TStaticItem;
+  i: Integer;
+begin
+  for i := Low(FMapBlock.Cells) to High(FMapBlock.Cells) do
+  begin
+    FMapBlock.Cells[i].CanBeEdited := dmNetwork.CanWrite(
+      FMapBlock.Cells[i].X, FMapBlock.Cells[i].Y);
+  end;
+
+  if FStaticBlock is TSeperatedStaticBlock then
+    TSeperatedStaticBlock(FStaticBlock).RebuildList; //fill items
+
+  for i := 0 to FStaticBlock.Items.Count - 1 do
+  begin
+    staticItem := TStaticItem(FStaticBlock.Items[i]);
+    staticItem.CanBeEdited := dmNetwork.CanWrite(
+      staticItem.X, staticItem.Y);
+  end;
+end;
+
 { TLandscape }
 
 constructor TLandscape.Create(AWidth, AHeight: Word);
@@ -533,7 +535,7 @@ begin
     targetStaticList := block.Cells[(y mod 8) * 8 + x mod 8];
     targetStaticList.Add(staticItem);
     for i := 0 to targetStaticList.Count - 1 do
-      UpdateStaticsPriority(TStaticItem(targetStaticList.Items[i]), i);
+      TStaticItem(targetStaticList.Items[i]).UpdatePriorities(i);
     targetStaticList.Sort(@CompareWorldItems);
     staticItem.Owner := block;
     if Assigned(FOnChange) then FOnChange;
@@ -591,7 +593,7 @@ begin
       begin
         staticItem.Z := ABuffer.ReadShortInt;
         for j := 0 to statics.Count - 1 do
-          UpdateStaticsPriority(TStaticItem(statics.Items[j]), j);
+          TStaticItem(statics.Items[j]).UpdatePriorities(j);
         statics.Sort(@CompareWorldItems);
         if Assigned(FOnChange) then FOnChange;
         Break;
@@ -650,7 +652,7 @@ begin
     statics := targetBlock.Cells[(newY mod 8) * 8 + newX mod 8];
     statics.Add(staticItem);
     for i := 0 to statics.Count - 1 do
-      UpdateStaticsPriority(TStaticItem(statics.Items[i]), i);
+      TStaticItem(statics.Items[i]).UpdatePriorities(i);
     statics.Sort(@CompareWorldItems);
     staticItem.Owner := targetBlock;
   end;
@@ -724,7 +726,7 @@ begin
                (TStaticItem(drawStatics[i]).Z <= AMaxZ) and
                ((AStaticsFilter = nil) or AStaticsFilter(TStaticItem(drawStatics[i]))) then
             begin
-              UpdateStaticsPriority(TStaticItem(drawStatics[i]), ADrawList.GetSerial);
+              TStaticItem(drawStatics[i]).UpdatePriorities(ADrawList.GetSerial);
               ADrawList.Add(TWorldItem(drawStatics[i]));
             end;
       end;
@@ -857,7 +859,7 @@ begin
       targetStaticList := targetBlock.Cells[(AY mod 8) * 8 + AX mod 8];
       targetStaticList.Add(AStatic);
       for i := 0 to targetStaticList.Count - 1 do
-        UpdateStaticsPriority(TStaticItem(targetStaticList.Items[i]), i);
+        TStaticItem(targetStaticList.Items[i]).UpdatePriorities(i);
       targetStaticList.Sort(@CompareWorldItems);
       AStatic.UpdatePos(AX, AY, AStatic.Z);
       AStatic.Owner := targetBlock;
@@ -896,19 +898,13 @@ begin
     dmNetwork.Send(TRequestBlocksPacket.Create(coords));
 end;
 
-procedure TLandscape.UpdateStaticsPriority(AStaticItem: TStaticItem;
+procedure TLandscape.UpdateBlockAccess;
-  APrioritySolver: Integer);
 var
-  staticTileData: TStaticTileData;
+  cacheEntry: PCacheEntry;
 begin
-  staticTileData := ResMan.Tiledata.StaticTiles[AStaticItem.TileID];
+  cacheEntry := nil;
-  AStaticItem.PriorityBonus := 0;
+  while FBlockCache.Iterate(cacheEntry) do
-  if not ((staticTileData.Flags and tdfBackground) = tdfBackground) then
+    TBlock(cacheEntry^.Obj).UpdateBlockAcess;
-    AStaticItem.PriorityBonus := AStaticItem.PriorityBonus + 1;
-  if staticTileData.Height > 0 then
-    AStaticItem.PriorityBonus := AStaticItem.PriorityBonus + 1;
-  AStaticItem.Priority := AStaticItem.Z + AStaticItem.PriorityBonus;
-  AStaticItem.PrioritySolver := APrioritySolver;
 end;
 
 { TMaterial }
@@ -1087,15 +1083,6 @@ begin
   Inc(FSerial);
 end;
 
-function TScreenBuffer.Iterate(var ABlockInfo: PBlockInfo): Boolean;
-begin
-  if ABlockInfo = nil then
-    ABlockInfo := FShortCuts[0]
-  else
-    ABlockInfo := ABlockInfo^.Next;
-  Result := ABlockInfo <> nil;
-end;
-
 function TScreenBuffer.Insert(AItem: TWorldItem): PBlockInfo;
 var
   current: PBlockInfo;
@@ -1145,6 +1132,15 @@ begin
   Inc(FCount);
 end;
 
+function TScreenBuffer.Iterate(var ABlockInfo: PBlockInfo): Boolean;
+begin
+  if ABlockInfo = nil then
+    ABlockInfo := FShortCuts[0]
+  else
+    ABlockInfo := ABlockInfo^.Next;
+  Result := ABlockInfo <> nil;
+end;
+
 //Mergesort
 procedure TScreenBuffer.Sort;
 

Client/UdmNetwork.lfm

@@ -1,15 +1,19 @@
 object dmNetwork: TdmNetwork
   OnCreate = DataModuleCreate
   OnDestroy = DataModuleDestroy
+  OldCreateOrder = False
   Height = 300
   HorizontalOffset = 290
   VerticalOffset = 171
   Width = 400
   object TCPClient: TLTCPComponent
+    Port = 0
     OnReceive = TCPClientReceive
     OnError = TCPClientError
     OnDisconnect = TCPClientDisconnect
     OnConnect = TCPClientConnect
+    Timeout = 0
+    ReuseAddress = False
     left = 40
     top = 24
   end

Client/UdmNetwork.pas

@@ -345,14 +345,16 @@ var
   i: Integer;
   pt: TPoint;
 begin
-  if FWriteMap.Count = 0 then Exit(True); //TODO : still too slow
+  if FWriteMap.Count > 0 then
-
+  begin
     pt := Point(AX, AY);
     for i := 0 to FWriteMap.Count - 1 do
       if PtInRect(FWriteMap.Rects[i], pt) then
         Exit(True);
 
     Result := False;
+  end else
+    Result := True;
 end;
 
 procedure TdmNetwork.Send(APacket: TPacket);

Client/UfrmMain.lfm

@@ -3,6 +3,7 @@ object frmMain: TfrmMain
   Height = 603
   Top = 126
   Width = 766
+  ActiveControl = oglGameWindow
   Caption = 'UO CentrED'
   ClientHeight = 580
   ClientWidth = 766
@@ -540,7 +541,7 @@ object frmMain: TfrmMain
         Top = 306
         Width = 218
         Align = alNone
-        Anchors = [akTop, akLeft, akRight]
+        Anchors = [akLeft, akRight, akBottom]
         ResizeAnchor = akBottom
       end
       object edSearchID: TEdit
@@ -1110,7 +1111,7 @@ object frmMain: TfrmMain
     Top = 435
     Width = 542
     Align = alNone
-    Anchors = [akLeft, akRight]
+    Anchors = [akLeft, akRight, akBottom]
     AutoSnap = False
     ResizeAnchor = akBottom
     Visible = False

Client/UfrmMain.pas

@@ -1662,7 +1662,6 @@ var
   tileRect: TRect;
   virtualTile: TVirtualTile;
   staticsFilter: TStaticFilter;
-  editing: Boolean;
   intensity: GLfloat;
   blockInfo: PBlockInfo;
   item: TWorldItem;
@@ -1688,19 +1687,17 @@ begin
     //TODO : implement CanBeEdited handling (dmNetwork.CanWrite.....)
     if acSelect.Checked or item.CanBeEdited then
     begin
-      editing := True;
       intensity := 1.0;
       SetNormalLights;
     end else
     begin
-      editing := False;
       intensity := 0.5;
       SetDarkLights;
     end;
 
     glColor4f(intensity, intensity, intensity, 1.0);
 
-    highlight := item.CanBeEdited and blockInfo^.Highlighted;
+    highlight := blockInfo^.Highlighted and item.CanBeEdited;
 
     if highlight then
     begin
@@ -2357,7 +2354,8 @@ begin
     $07: //access changed
       begin
         accessLevel := TAccessLevel(ABuffer.ReadByte);
-        dmNetwork.UpdateWriteMap(ABuffer);
+        dmNetwork.UpdateWriteMap(ABuffer); //TODO : movie writemap to landscape
+        FLandscape.UpdateBlockAccess; //TODO : could be handled by updatewritemap
 
         if accessLevel <> dmNetwork.AccessLevel then
         begin

UCacheManager.pas

@@ -21,7 +21,7 @@
  * CDDL HEADER END
  *
  *
- *      Portions Copyright 2007 Andreas Schneider
+ *      Portions Copyright 2009 Andreas Schneider
  *)
 unit UCacheManager;
 
@@ -48,18 +48,22 @@ type
     constructor Create(ASize: Integer);
     destructor Destroy; override;
   protected
+    { Members }
     FSize: Integer;
     FFirst: PCacheEntry;
     FLast: PCacheEntry;
     FOnRemoveObject: TRemoveObjectEvent;
   public
+    { Fields }
+    property OnRemoveObject: TRemoveObjectEvent read FOnRemoveObject write FOnRemoveObject;
+    { Methods }
     function QueryID(const AID: Integer; out AObj: TObject): Boolean;
     procedure StoreID(AID: Integer; AObj: TObject);
     procedure DiscardID(AID: Integer);
     procedure DiscardObj(AObj: TObject);
     procedure RemoveID(AID: Integer);
     procedure Clear;
-    property OnRemoveObject: TRemoveObjectEvent read FOnRemoveObject write FOnRemoveObject;
+    function Iterate(var ACacheEntry: PCacheEntry): Boolean;
   end;
 
 implementation
@@ -182,6 +186,15 @@ begin
   end;
 end;
 
+function TCacheManager.Iterate(var ACacheEntry: PCacheEntry): Boolean;
+begin
+  if ACacheEntry = nil then
+    ACacheEntry := FFirst
+  else
+    ACacheEntry := ACacheEntry^.Next;
+  Result := ACacheEntry <> nil;
+end;
+
 function TCacheManager.QueryID(const AID: Integer;
   out AObj: TObject): Boolean;
 var

UOLib/UStatics.pas

@@ -21,7 +21,7 @@
  * CDDL HEADER END
  *
  *
- *      Portions Copyright 2007 Andreas Schneider
+ *      Portions Copyright 2009 Andreas Schneider
  *)
 unit UStatics;
 
@@ -30,52 +30,71 @@ unit UStatics;
 interface
 
 uses
-  SysUtils, Classes, UMulBlock, UGenericIndex, UTiledata, UWorldItem;
+  SysUtils, Classes, UGenericIndex, UWorldItem, UTiledata;
 
 type
+  { TStaticItem }
+
   TStaticItem = class(TWorldItem)
     constructor Create(AOwner: TWorldBlock; AData: TStream; ABlockX, ABlockY: Word); overload;
     constructor Create(AOwner: TWorldBlock; AData: TStream); overload;
-    function Clone: TStaticItem; override;
-    function GetIdentifier: Integer;
-    function GetSize: Integer; override;
-    procedure Write(AData: TStream); override;
   protected
-    FHue, FOrgHue: Word;
+    { Members }
-    procedure SetHue(AHue: Word);
+    FHue: Word;
+    FOrgHue: Word;
+    { Methods }
     function HasChanged: Boolean; override;
+    procedure SetHue(AHue: Word);
   public
-    procedure InitOriginalState; override;
+    { Fields }
     property Hue: Word read FHue write SetHue;
+    { Methods }
+    function Clone: TStaticItem; override;
+    function GetSize: Integer; override;
+    procedure InitOriginalState; override;
+    procedure UpdatePriorities(ASolver: Integer);
+    procedure Write(AData: TStream); override;
   end;
+
+  { TStaticBlock}
+
   TStaticBlock = class(TWorldBlock)
     constructor Create(AData: TStream; AIndex: TGenericIndex; AX, AY: Word); overload;
     constructor Create(AData: TStream; AIndex: TGenericIndex); overload;
     destructor Destroy; override;
-    function Clone: TStaticBlock; override;
-    function GetSize: Integer; override;
-    procedure Write(AData: TStream); override;
-    procedure ReverseWrite(AData: TStream);
-    procedure Sort;
   protected
+    { Members }
     FItems: TList;
   public
+    { Fields }
     property Items: TList read FItems write FItems;
+    { Methods }
+    function Clone: TStaticBlock; override;
+    function GetSize: Integer; override;
+    procedure ReverseWrite(AData: TStream);
+    procedure Sort;
+    procedure Write(AData: TStream); override;
   end;
+
+  { TSeperatedStaticBlock }
+
   TSeperatedStaticBlock = class(TStaticBlock)
     constructor Create(AData: TStream; AIndex: TGenericIndex; AX, AY: Word); overload;
     constructor Create(AData: TStream; AIndex: TGenericIndex); overload;
     destructor Destroy; override;
-    function Clone: TSeperatedStaticBlock; override;
-    function GetSize: Integer; override;
-  protected
-    procedure RefreshList;
   public
     Cells: array[0..63] of TList;
+    { Methods }
+    function Clone: TSeperatedStaticBlock; override;
+    function GetSize: Integer; override;
+    procedure RebuildList;
   end;
 
 implementation
 
+uses
+  UGameResources; //Used for priority calculation
+
 { TStaticItem }
 
 constructor TStaticItem.Create(AOwner: TWorldBlock; AData: TStream; ABlockX, ABlockY: Word);
@@ -102,6 +121,17 @@ begin
   Create(AOwner, AData, 0, 0);
 end;
 
+function TStaticItem.HasChanged: Boolean;
+begin
+  Result := (FHue <> FOrgHue) or inherited HasChanged;
+end;
+
+procedure TStaticItem.SetHue(AHue: Word);
+begin
+  FHue := AHue;
+  DoChanged;
+end;
+
 function TStaticItem.Clone: TStaticItem;
 begin
   Result := TStaticItem.Create(nil, nil);
@@ -112,9 +142,29 @@ begin
   Result.FHue := FHue;
 end;
 
-function TStaticItem.GetIdentifier: Integer;
+function TStaticItem.GetSize: Integer;
 begin
-  Result := 0 or (((FX mod 8) shl 28) and $F0000000) or (((FY mod 8) shl 24) and $0F000000) or ((Byte(FZ) shl 16) and $00FF0000) or (Word(FTileID) and $0000FFFF);
+  Result := 7;
+end;
+
+procedure TStaticItem.InitOriginalState;
+begin
+  FOrgHue := FHue;
+  inherited InitOriginalState;
+end;
+
+procedure TStaticItem.UpdatePriorities(ASolver: Integer);
+var
+  staticTileData: TStaticTileData;
+begin
+  staticTileData := ResMan.Tiledata.StaticTiles[FTileID];
+  FPriorityBonus := 0;
+  if not ((staticTileData.Flags and tdfBackground) = tdfBackground) then
+    Inc(FPriorityBonus);
+  if staticTileData.Height > 0 then
+    Inc(FPriorityBonus);
+  FPriority := Z + FPriorityBonus;
+  FPrioritySolver := ASolver;
 end;
 
 procedure TStaticItem.Write(AData: TStream);
@@ -131,28 +181,6 @@ begin
   AData.Write(FHue, SizeOf(SmallInt));
 end;
 
-function TStaticItem.GetSize: Integer;
-begin
-  Result := 7;
-end;
-
-function TStaticItem.HasChanged: Boolean;
-begin
-  Result := (FHue <> FOrgHue) or inherited HasChanged;
-end;
-
-procedure TStaticItem.InitOriginalState;
-begin
-  FOrgHue := FHue;
-  inherited InitOriginalState;
-end;
-
-procedure TStaticItem.SetHue(AHue: Word);
-begin
-  FHue := AHue;
-  DoChanged;
-end;
-
 { TStaticBlock }
 
 constructor TStaticBlock.Create(AData: TStream; AIndex: TGenericIndex; AX, AY: Word);
@@ -214,14 +242,6 @@ begin
   Result := FItems.Count * 7;
 end;
 
-procedure TStaticBlock.Write(AData: TStream);
-var
-  i: Integer;
-begin
-  for i := 0 to FItems.Count - 1 do
-    TStaticItem(FItems[i]).Write(AData);
-end;
-
 procedure TStaticBlock.ReverseWrite(AData: TStream);
 var
   i: Integer;
@@ -233,49 +253,16 @@ begin
 end;
 
 procedure TStaticBlock.Sort;
-var
-  iMin, iMax: Integer;
-
-  procedure sift;
-  var
-    i, j: integer;
-  begin
-    i := iMin;
-    j := 2 * i;
-    FItems[0] := FItems[i];
-    while j <= iMax do
-    begin
-      if j < iMax then
-        if TStaticItem(FItems[j]).GetIdentifier < TStaticItem(FItems[j + 1]).GetIdentifier then inc(j);
-      if TStaticItem(FItems[0]).GetIdentifier >= TStaticItem(FItems[j]).GetIdentifier then break;
-      FItems[i] := FItems[j];
-      i := j;
-      j := 2 * i;
-    end;
-    FItems[i] := FItems[0];
-  end;
-
 begin
-  if FItems.Count > 0 then
+  FItems.Sort(@CompareWorldItems);
-  begin
+end;
-    iMax := FItems.Count;
+
-    iMin := iMax div 2 + 1;
+procedure TStaticBlock.Write(AData: TStream);
-    FItems.Insert(0, nil);
+var
-    while iMin > 1 do
+  i: Integer;
-    begin
+begin
-      dec(iMin);
+  for i := 0 to FItems.Count - 1 do
-      sift;
+    TStaticItem(FItems[i]).Write(AData);
-    end;
-    while iMax > 1 do
-    begin
-      FItems[0] := FItems[iMin];
-      FItems[iMin] := FItems[iMax];
-      FItems[iMax] := FItems[0];
-      dec(iMax);
-      sift;
-    end;
-    FItems.Delete(0);
-  end;
 end;
 
 { TSeperatedStaticBlock }
@@ -339,6 +326,27 @@ begin
   inherited Destroy;
 end;
 
+procedure TSeperatedStaticBlock.RebuildList;
+var
+  i, j, solver: Integer;
+begin
+  FItems.Clear;
+  solver := 0;
+  for i := 0 to 63 do
+  begin
+    if Cells[i] <> nil then
+    begin
+      for j := 0 to Cells[i].Count - 1 do
+      begin
+        FItems.Add(Cells[i].Items[j]);
+        TStaticItem(Cells[i].Items[j]).UpdatePriorities(solver);
+        Inc(solver);
+      end;
+    end;
+  end;
+  Sort;
+end;
+
 function TSeperatedStaticBlock.Clone: TSeperatedStaticBlock;
 var
   i, j: Integer;
@@ -352,26 +360,9 @@ end;
 
 function TSeperatedStaticBlock.GetSize: Integer;
 begin
-  RefreshList;
+  RebuildList;
   Result := inherited GetSize;
 end;
 
-procedure TSeperatedStaticBlock.RefreshList;
-var
-  i, j: Integer;
-begin
-  FItems.Clear;
-  for i := 0 to 63 do
-  begin
-    if Cells[i] <> nil then
-    begin
-      for j := 0 to Cells[i].Count - 1 do
-        if Cells[i].Items[j] <> nil then
-          FItems.Add(Cells[i].Items[j]);
-    end;
-  end;
-  Sort;
-end;
-
 end.
 

UOLib/UWorldItem.pas

@@ -34,6 +34,9 @@ uses
 
 type
   TWorldBlock = class;
+
+  { TWorldItem }
+
   TWorldItem = class(TMulBlock)
     constructor Create(AOwner: TWorldBlock);
   protected
@@ -75,6 +78,9 @@ type
     property PriorityBonus: ShortInt read FPriorityBonus write FPriorityBonus;
     property PrioritySolver: Integer read FPrioritySolver write FPrioritySolver;
   end;
+
+  { TWorldBlock }
+
   TWorldBlock = class(TMulBlock)
     constructor Create;
   protected
@@ -95,8 +101,37 @@ type
     procedure CleanUp;
   end;
 
+function CompareWorldItems(AItem1, AItem2: Pointer): Integer;
+
 implementation
 
+uses
+  UMap, UStatics;
+
+function CompareWorldItems(AItem1, AItem2: Pointer): Integer;
+begin
+  if TWorldItem(AItem1).X <> TWorldItem(AItem2).X then
+    Exit(TWorldItem(AItem1).X - TWorldItem(AItem2).X);
+
+  if TWorldItem(AItem1).Y <> TWorldItem(AItem2).Y then
+    Exit(TWorldItem(AItem1).Y - TWorldItem(AItem2).Y);
+
+  Result := TWorldItem(AItem1).Priority - TWorldItem(AItem2).Priority;
+  if Result = 0 then
+  begin
+    if (TObject(AItem1) is TMapCell) and (TObject(AItem2) is TStaticItem) then
+      Result := -1
+    else if (TObject(AItem1) is TStaticItem) and (TObject(AItem2) is TMapCell) then
+      Result := 1;
+  end;
+
+  if Result = 0 then
+    Result := TWorldItem(AItem1).PriorityBonus - TWorldItem(AItem2).PriorityBonus;
+
+  if Result = 0 then
+    Result := TWorldItem(AItem1).PrioritySolver - TWorldItem(AItem2).PrioritySolver;
+end;
+
 { TWorldItem }
 
 constructor TWorldItem.Create(AOwner: TWorldBlock);