Client/CentrED.lpi

@@ -325,7 +325,7 @@
         <MinVersion Minor="5" Release="3" Valid="True"/>
       </Item6>
     </RequiredPackages>
-    <Units Count="48">
+    <Units Count="49">
       <Unit0>
         <Filename Value="CentrED.lpr"/>
         <IsPartOfProject Value="True"/>
@@ -581,6 +581,10 @@
         <Filename Value="UActions.pas"/>
         <IsPartOfProject Value="True"/>
       </Unit47>
+      <Unit48>
+        <Filename Value="UUoaDesigns.pas"/>
+        <IsPartOfProject Value="True"/>
+      </Unit48>
     </Units>
   </ProjectOptions>
   <CompilerOptions>

Client/ULandscape.pas

@@ -320,6 +320,21 @@ type
     Hue: Word;
   end;
 
+  TGhostTile = class(TStaticItem);
+
+  { TMovableGhostTile }
+
+  TMovableGhostTile = class(TGhostTile)
+  private
+    FOriginalX: Word;
+    FOriginalY: Word;
+    FOriginalZ: ShortInt;
+  public
+    property OriginalX: Word read FOriginalX write FOriginalX;
+    property OriginalY: Word read FOriginalY write FOriginalY;
+    property OriginalZ: ShortInt read FOriginalZ write FOriginalZ;
+  end;
+
 operator enumerator(AScreenBuffer: TScreenBuffer): TScreenBufferItemEnumerator;
 
 implementation
@@ -996,6 +1011,7 @@ var
   i, x, y: Integer;
   tempDrawList: TWorldItemList;
   staticTileData: TStaticTiledata;
+  blockInfo: PBlockInfo;
 begin
   ADrawList.Clear;
   tempDrawList := TWorldItemList.Create(False);;
@@ -1042,7 +1058,11 @@ begin
 
   tempDrawList.Sort(@CompareWorldItems);
   for i := 0 to tempDrawList.Count - 1 do
-    ADrawList.Add(TWorldItem(tempDrawList[i]));
+  begin
+    blockInfo := ADrawList.Add(TWorldItem(tempDrawList[i]));
+    if tempDrawList[i] is TGhostTile then
+      blockInfo^.State := ssGhost;
+  end;
   tempDrawList.Free;
 end;
 

Client/ULightManager.pas

@@ -370,7 +370,7 @@ var
   s: string;
   i, id, col, r, g, b: Integer;
 begin
-  writeln('Loading Colors from ', AFileName); //TODO
+  //writeln('Loading Colors from ', AFileName); //TODO
   for i := 1 to ColorsCount do begin
     FLightColors[i].R := 1.0;
     FLightColors[i].G := 1.0;

Client/UUoaDesigns.pas

@@ -0,0 +1,187 @@
+unit UUoaDesigns;
+
+{$mode ObjFPC}{$H+}
+{$modeSwitch advancedRecords}
+
+interface
+
+uses
+  Classes, SysUtils, Generics.Collections, UStatics;
+
+type
+
+  { TUoaDesignHeader }
+
+  TUoaDesignHeader = record
+    Name: String;
+    Category: String;
+    Subcategory: String;
+    Width: Int32;
+    Height: Int32;
+    UserWidth: Int32;
+    UserHeight: Int32;
+    FilePosition: Int64;
+    TileCount: Int32;
+  public
+    constructor CreateFromStream(AStream: TStream);
+  end;
+
+  { TUoaDesignHeaders }
+
+  TUoaDesignHeaders = class(specialize TList<TUoaDesignHeader>)
+    constructor CreateFromStream(AStream: TStream);
+  end;
+
+  TUoaDesign = class
+  private
+    FHeader: TUoaDesignHeader;
+    FTiles: TStaticItemList;
+
+    constructor Create(AHeader: TUoaDesignHeader; AData: TStream);
+  public
+    property Header: TUoaDesignHeader read FHeader;
+    property Tiles: TStaticItemList read Ftiles;
+
+    destructor Destroy; override;
+  end;
+
+  { TUoaDesigns }
+
+  TUoaDesigns = class
+  private
+    FHeaders: TUoaDesignHeaders;
+    FData: TFileStream;
+  public
+    constructor Create(AIdxFile, ABinFile: String);
+    destructor Destroy; override;
+
+    function LoadDesign(AHeader: TUoaDesignHeader): TUoaDesign;
+  public
+    property Headers: TUoaDesignHeaders read FHeaders;
+  end;
+
+implementation
+
+uses
+  Math;
+
+function ReadString(AStream: TStream): String;
+var
+  nonNullFlag: Byte;
+  length: Byte;
+begin
+  nonNullFlag := AStream.ReadByte;
+  if nonNullFlag = 1 then
+  begin
+    length := AStream.ReadByte;
+    SetLength(Result, length);
+    if length > 0 then
+      AStream.Read(PChar(Result)^, length);
+  end;
+end;
+
+{ TUoaDesign }
+
+constructor TUoaDesign.Create(AHeader: TUoaDesignHeader; AData: TStream);
+var
+  i: Integer;
+  tile: TStaticItem;
+  version: Int32;
+
+  function ReadInt: Int32;
+  begin
+    AData.Read(Result, SizeOf(Result));
+  end;
+
+begin
+  FHeader := AHeader;
+  FTiles := TStaticItemList.Create(True);
+  AData.Seek(FHeader.FilePosition, soFromBeginning);
+  for i := 0 to FHeader.TileCount - 1 do
+  begin
+    AData.Read(version, SizeOf(version));
+    if (version < 0) or (version > 1) then
+      raise Exception.Create('Unsupported binary version');
+
+    tile := TStaticItem.Create(nil);
+    tile.TileID := ReadInt;
+    tile.X := ReadInt;
+    tile.Y := ReadInt;
+    tile.Z := EnsureRange(ReadInt, -128, 127);
+    ReadInt; // Level; unused
+
+    if version = 1 then
+      tile.Hue := ReadInt;
+
+    FTiles.Add(tile);
+  end;
+end;
+
+destructor TUoaDesign.Destroy;
+begin
+  FTiles.Free;
+  inherited Destroy;
+end;
+
+{ TUoaDesignHeaders }
+
+constructor TUoaDesignHeaders.CreateFromStream(AStream: TStream);
+var
+  headerCount, version: Int32;
+  i: Integer;
+begin
+  AStream.Read(headerCount, SizeOf(headerCount));
+  AStream.Read(version, SizeOf(version));
+
+  if version <> 0 then
+    raise Exception.Create('Unknown UOA design index version');
+
+  inherited Create;
+
+  for i := 0 to headerCount-1 do
+    Add(TUoaDesignHeader.CreateFromStream(AStream));
+end;
+
+{ TUoaDesignHeader }
+
+constructor TUoaDesignHeader.CreateFromStream(AStream: TStream);
+begin
+  Name := ReadString(AStream);
+  Category := ReadString(AStream);
+  Subcategory := ReadString(AStream);
+  AStream.Read(Width, SizeOf(Width));
+  AStream.Read(Height, SizeOf(Height));
+  AStream.Read(UserWidth, SizeOf(UserWidth));
+  AStream.Read(UserHeight, SizeOf(UserHeight));
+  AStream.Read(FilePosition, SizeOf(FilePosition));
+  AStream.Read(TileCount, SizeOf(TileCount));
+end;
+
+{ TUoaDesigns }
+
+constructor TUoaDesigns.Create(AIdxFile, ABinFile: String);
+var
+  idxStream: TFileStream;
+begin
+  idxStream := TFileStream.Create(AIdxFile, fmOpenRead);
+  try
+    FHeaders := TUoaDesignHeaders.CreateFromStream(idxStream);
+  finally
+    idxStream.Free;
+  end;
+
+  FData := TFileStream.Create(ABinFile, fmOpenRead);
+end;
+
+destructor TUoaDesigns.Destroy;
+begin
+  Headers.Free;
+end;
+
+function TUoaDesigns.LoadDesign(AHeader: TUoaDesignHeader): TUoaDesign;
+begin
+  Result := TUoaDesign.Create(AHeader, FData);
+end;
+
+end.
+

Client/UfrmMain.lfm

@@ -1,12 +1,12 @@
 object frmMain: TfrmMain
   Left = 87
-  Height = 961
+  Height = 781
   Top = 70
-  Width = 1180
+  Width = 1172
   ActiveControl = oglGameWindow
   Caption = 'UO CentrED'
-  ClientHeight = 961
-  ClientWidth = 1180
+  ClientHeight = 781
+  ClientWidth = 1172
   Constraints.MinHeight = 781
   Constraints.MinWidth = 1172
   DesignTimePPI = 120
@@ -23,12 +23,12 @@ object frmMain: TfrmMain
   object pnlBottom: TPanel
     Left = 0
     Height = 49
-    Top = 912
-    Width = 1180
+    Top = 732
+    Width = 1172
     Align = alBottom
     BevelOuter = bvNone
     ClientHeight = 49
-    ClientWidth = 1180
+    ClientWidth = 1172
     TabOrder = 0
     object lblX: TLabel
       Left = 18
@@ -61,7 +61,7 @@ object frmMain: TfrmMain
       Transparent = False
     end
     object lblTip: TLabel
-      Left = 803
+      Left = 795
       Height = 49
       Top = 0
       Width = 365
@@ -75,7 +75,7 @@ object frmMain: TfrmMain
       Transparent = False
     end
     object lblTipC: TLabel
-      Left = 767
+      Left = 759
       Height = 49
       Top = 0
       Width = 36
@@ -118,22 +118,22 @@ object frmMain: TfrmMain
   end
   object pcLeft: TPageControl
     Left = 0
-    Height = 874
+    Height = 694
     Top = 38
     Width = 350
-    ActivePage = tsTiles
+    ActivePage = tsUoaDesigns
     Align = alLeft
-    TabIndex = 0
+    TabIndex = 3
     TabOrder = 1
     object tsTiles: TTabSheet
       Caption = 'Tiles'
-      ClientHeight = 836
+      ClientHeight = 656
       ClientWidth = 340
       object lblFilter: TLabel
         AnchorSideLeft.Control = cbTerrain
         AnchorSideLeft.Side = asrBottom
         AnchorSideTop.Control = cbTerrain
-        Left = 114
+        Left = 109
         Height = 26
         Top = 12
         Width = 47
@@ -152,9 +152,9 @@ object frmMain: TfrmMain
         AnchorSideRight.Side = asrBottom
         AnchorSideBottom.Control = spTileList
         Left = 6
-        Height = 493
+        Height = 319
         Hint = '-'
-        Top = 74
+        Top = 68
         Width = 328
         Anchors = [akTop, akLeft, akRight, akBottom]
         BorderSpacing.Left = 6
@@ -213,11 +213,11 @@ object frmMain: TfrmMain
         AnchorSideBottom.Side = asrBottom
         Left = 0
         Height = 261
-        Top = 575
+        Top = 395
         Width = 340
         Anchors = [akTop, akLeft, akRight, akBottom]
         Caption = 'Random pool'
-        ClientHeight = 234
+        ClientHeight = 237
         ClientWidth = 338
         TabOrder = 1
         object btnAddRandom: TSpeedButton
@@ -375,7 +375,7 @@ object frmMain: TfrmMain
           Left = 256
           Height = 35
           Hint = 'Save Preset'
-          Top = 186
+          Top = 189
           Width = 35
           Anchors = [akTop, akRight]
           BorderSpacing.Right = 6
@@ -427,7 +427,7 @@ object frmMain: TfrmMain
           Left = 297
           Height = 35
           Hint = 'Delete Preset'
-          Top = 186
+          Top = 189
           Width = 35
           Anchors = [akTop, akRight]
           BorderSpacing.Right = 6
@@ -482,7 +482,7 @@ object frmMain: TfrmMain
           AnchorSideBottom.Control = cbRandomPreset
           Cursor = 63
           Left = 6
-          Height = 143
+          Height = 146
           Top = 37
           Width = 326
           Anchors = [akTop, akLeft, akRight, akBottom]
@@ -532,7 +532,7 @@ object frmMain: TfrmMain
           AnchorSideBottom.Side = asrBottom
           Left = 6
           Height = 42
-          Top = 186
+          Top = 189
           Width = 244
           Anchors = [akLeft, akRight, akBottom]
           BorderSpacing.Left = 6
@@ -552,7 +552,7 @@ object frmMain: TfrmMain
         Cursor = crVSplit
         Left = 0
         Height = 8
-        Top = 567
+        Top = 387
         Width = 340
         Align = alNone
         Anchors = [akLeft, akRight, akBottom]
@@ -566,7 +566,7 @@ object frmMain: TfrmMain
         Left = 172
         Height = 38
         Hint = 'Append S or T to restrict the search to Statics or Terrain.'
-        Top = 517
+        Top = 337
         Width = 150
         Anchors = [akRight, akBottom]
         BorderSpacing.Right = 12
@@ -585,10 +585,10 @@ object frmMain: TfrmMain
         AnchorSideTop.Side = asrBottom
         AnchorSideRight.Control = tsTiles
         AnchorSideRight.Side = asrBottom
-        Left = 114
+        Left = 109
         Height = 38
         Top = 38
-        Width = 201
+        Width = 206
         Anchors = [akTop, akLeft, akRight]
         BorderSpacing.Right = 25
         OnEditingDone = edFilterEditingDone
@@ -600,9 +600,9 @@ object frmMain: TfrmMain
         AnchorSideTop.Control = cbTerrain
         AnchorSideTop.Side = asrBottom
         Left = 8
-        Height = 28
-        Top = 40
-        Width = 79
+        Height = 25
+        Top = 37
+        Width = 74
         Caption = 'Statics'
         Checked = True
         OnChange = cbStaticsChange
@@ -613,9 +613,9 @@ object frmMain: TfrmMain
         AnchorSideLeft.Control = tsTiles
         AnchorSideTop.Control = tsTiles
         Left = 6
-        Height = 28
+        Height = 25
         Top = 12
-        Width = 83
+        Width = 78
         BorderSpacing.Left = 6
         BorderSpacing.Top = 12
         Caption = 'Terrain'
@@ -627,11 +627,11 @@ object frmMain: TfrmMain
     end
     object tsClients: TTabSheet
       Caption = 'Clients'
-      ClientHeight = 836
+      ClientHeight = 656
       ClientWidth = 340
       object lbClients: TListBox
         Left = 0
-        Height = 836
+        Height = 656
         Top = 0
         Width = 340
         Align = alClient
@@ -646,7 +646,7 @@ object frmMain: TfrmMain
     end
     object tsLocations: TTabSheet
       Caption = 'Locations'
-      ClientHeight = 836
+      ClientHeight = 656
       ClientWidth = 340
       object btnClearLocations: TSpeedButton
         AnchorSideLeft.Control = btnDeleteLocation
@@ -655,7 +655,7 @@ object frmMain: TfrmMain
         Left = 194
         Height = 35
         Hint = 'Clear'
-        Top = 795
+        Top = 615
         Width = 36
         BorderSpacing.Left = 6
         Glyph.Data = {
@@ -706,7 +706,7 @@ object frmMain: TfrmMain
         Left = 152
         Height = 35
         Hint = 'Delete'
-        Top = 795
+        Top = 615
         Width = 36
         Anchors = [akLeft, akBottom]
         BorderSpacing.Bottom = 6
@@ -756,7 +756,7 @@ object frmMain: TfrmMain
         Left = 110
         Height = 35
         Hint = 'Add'
-        Top = 795
+        Top = 615
         Width = 36
         Anchors = [akTop, akRight]
         BorderSpacing.Right = 6
@@ -808,7 +808,7 @@ object frmMain: TfrmMain
         AnchorSideBottom.Control = btnDeleteLocation
         Cursor = 63
         Left = 6
-        Height = 783
+        Height = 603
         Top = 6
         Width = 328
         Anchors = [akTop, akLeft, akRight, akBottom]
@@ -843,12 +843,61 @@ object frmMain: TfrmMain
         OnSaveNode = vstLocationsSaveNode
       end
     end
+    object tsUoaDesigns: TTabSheet
+      Caption = 'UOA Designs'
+      ClientHeight = 656
+      ClientWidth = 340
+      object vstUoaDesigns: TLazVirtualStringTree
+        Cursor = 63
+        Left = 8
+        Height = 640
+        Top = 8
+        Width = 324
+        Align = alClient
+        BorderSpacing.Around = 8
+        DefaultNodeHeight = 26
+        DefaultText = 'Node'
+        Header.AutoSizeIndex = 0
+        Header.Columns = <        
+          item
+            Position = 0
+            Text = 'Name'
+            Width = 200
+          end        
+          item
+            Position = 1
+            Text = 'Category'
+            Width = 100
+          end>
+        Header.Options = [hoColumnResize, hoDrag, hoShowSortGlyphs, hoVisible]
+        TabOrder = 0
+        TreeOptions.MiscOptions = [toFullRepaintOnResize, toInitOnSave, toToggleOnDblClick, toWheelPanning]
+        TreeOptions.PaintOptions = [toShowButtons, toShowDropmark, toThemeAware, toUseBlendedImages]
+        TreeOptions.SelectionOptions = [toFullRowSelect]
+        OnDblClick = vstUoaDesignsDblClick
+        OnGetText = vstUoaDesignsGetText
+      end
+      object btnCancelUOAPlacement: TButton
+        AnchorSideLeft.Control = vstUoaDesigns
+        AnchorSideLeft.Side = asrCenter
+        AnchorSideTop.Control = vstUoaDesigns
+        AnchorSideTop.Side = asrCenter
+        Left = 103
+        Height = 47
+        Top = 305
+        Width = 134
+        Caption = 'Cancel'
+        OnClick = btnCancelUOAPlacementClick
+        TabOrder = 1
+        Visible = False
+      end
+    end
   end
   object tbMain: TToolBar
     Left = 0
     Height = 38
     Top = 0
-    Width = 1180
+    Width = 1172
     Caption = 'tbMain'
     Images = ImageList1
     ParentShowHint = False
@@ -1038,13 +1087,13 @@ object frmMain: TfrmMain
     AnchorSideBottom.Control = spChat
     Left = 350
     Height = 35
-    Top = 667
-    Width = 830
+    Top = 487
+    Width = 822
     Anchors = [akLeft, akRight, akBottom]
     BevelInner = bvRaised
     BevelOuter = bvLowered
     ClientHeight = 35
-    ClientWidth = 830
+    ClientWidth = 822
     TabOrder = 3
     object lblChatHeaderCaption: TLabel
       Cursor = crHandPoint
@@ -1074,12 +1123,12 @@ object frmMain: TfrmMain
     AnchorSideBottom.Control = pnlBottom
     Left = 350
     Height = 202
-    Top = 710
-    Width = 830
+    Top = 530
+    Width = 822
     Anchors = [akTop, akLeft, akRight, akBottom]
     BevelOuter = bvNone
     ClientHeight = 202
-    ClientWidth = 830
+    ClientWidth = 822
     TabOrder = 4
     Visible = False
     object vstChat: TLazVirtualStringTree
@@ -1087,7 +1136,7 @@ object frmMain: TfrmMain
       Left = 0
       Height = 164
       Top = 0
-      Width = 830
+      Width = 822
       Align = alClient
       DefaultText = 'Node'
       Header.AutoSizeIndex = 2
@@ -1105,7 +1154,7 @@ object frmMain: TfrmMain
         item
           Position = 2
           Text = 'Message'
-          Width = 592
+          Width = 584
         end>
       Header.DefaultHeight = 26
       Header.Height = 26
@@ -1126,7 +1175,7 @@ object frmMain: TfrmMain
       Left = 0
       Height = 38
       Top = 164
-      Width = 830
+      Width = 822
       Align = alBottom
       OnKeyPress = edChatKeyPress
       TabOrder = 1
@@ -1140,8 +1189,8 @@ object frmMain: TfrmMain
     Cursor = crVSplit
     Left = 350
     Height = 8
-    Top = 702
-    Width = 830
+    Top = 522
+    Width = 822
     Align = alNone
     Anchors = [akLeft, akRight, akBottom]
     AutoSnap = False
@@ -1157,9 +1206,9 @@ object frmMain: TfrmMain
     AnchorSideRight.Side = asrBottom
     AnchorSideBottom.Control = pnlChatHeader
     Left = 350
-    Height = 629
+    Height = 449
     Top = 38
-    Width = 830
+    Width = 822
     Anchors = [akTop, akLeft, akRight, akBottom]
     OnDblClick = oglGameWindowDblClick
     OnKeyDown = oglGameWindowKeyDown

Client/UfrmMain.pas

@@ -37,7 +37,7 @@ uses
   LCLIntf, UOverlayUI, UStatics, UEnhancedMemoryStream, ActnList,
   XMLPropStorage, ImagingClasses, dateutils, UPlatformTypes, UMap, UPacket,
   UGLFont, DOM, XMLRead, XMLWrite, strutils, ULightManager, fgl, UTiledata,
-  UActions;
+  UActions, UUoaDesigns;
 
 type
   TAccessChangedListener = procedure(AAccessLevel: TAccessLevel) of object;
@@ -47,7 +47,6 @@ type
 
   TBlockInfoList = specialize TFPGList<PBlockInfo>;
 
-  TGhostTile = class(TStaticItem);
   TPacketList = specialize TFPGObjectList<TPacket>;
   TAccessChangedListeners = specialize TFPGList<TAccessChangedListener>;
   TSelectionListeners = specialize TFPGList<TSelectionListener>;
@@ -89,6 +88,7 @@ type
     btnGoTo: TButton;
     btnRandomPresetDelete: TSpeedButton;
     btnRandomPresetSave: TSpeedButton;
+    btnCancelUOAPlacement: TButton;
     cbRandomPreset: TComboBox;
     cbStatics: TCheckBox;
     cbTerrain: TCheckBox;
@@ -97,6 +97,7 @@ type
     edSearchID: TEdit;
     gbRandom: TGroupBox;
     ImageList1: TImageList;
+    vstUoaDesigns: TLazVirtualStringTree;
     lblChatHeaderCaption: TLabel;
     lblFilter: TLabel;
     lblTipC: TLabel;
@@ -162,6 +163,7 @@ type
     pmViewTerrainSettings: TPopupMenu;
     spChat: TSplitter;
     spTileList: TSplitter;
+    tsUoaDesigns: TTabSheet;
     tbFilter: TToolButton;
     tbFlat: TToolButton;
     tbNoDraw: TToolButton;
@@ -218,6 +220,7 @@ type
       var CanShow: Boolean; var HintInfo: THintInfo);
     procedure btnAddLocationClick(Sender: TObject);
     procedure btnAddRandomClick(Sender: TObject);
+    procedure btnCancelUOAPlacementClick(Sender: TObject);
     procedure btnClearLocationsClick(Sender: TObject);
     procedure btnClearRandomClick(Sender: TObject);
     procedure btnDeleteLocationClick(Sender: TObject);
@@ -320,6 +323,10 @@ type
       Column: TColumnIndex; const NewText: String);
     procedure vstLocationsSaveNode(Sender: TBaseVirtualTree;
       Node: PVirtualNode; Stream: TStream);
+    procedure vstUoaDesignsDblClick(Sender: TObject);
+    procedure vstUoaDesignsGetText(Sender: TBaseVirtualTree;
+      Node: PVirtualNode; Column: TColumnIndex; TextType: TVSTTextType;
+      var CellText: String);
     procedure XMLPropStorage1RestoreProperties(Sender: TObject);
   protected
     { Members }
@@ -354,12 +361,18 @@ type
     FUndoList: TPacketList;
     FGLFont: TGLFont;
     FSelectionListeners: TSelectionListeners;
+    FHoverListeners: TSelectionListeners;
     FTileHint: TTileHintInfo;
     FLightManager: TLightManager;
     FTileFilter: TTileDataFlags;
+    FUoaDesigns: TUoaDesigns;
+    FCurrentUoaDesign: TUoaDesign;
+    FCurrentUoaDesignAnchor: TWorldItem;
+    FCurrentUoaTiles: TStaticItemList;
     { Methods }
     procedure BuildTileList;
     function  ConfirmAction: Boolean;
+    procedure EnableActions(AEnabled: Boolean);
     function  FindRandomPreset(AName: String): TDOMElement;
     procedure ForceUpdateCurrentTile;
     procedure GetDrawOffset(AX, AY: Integer; out DrawX, DrawY: Integer); inline;
@@ -369,9 +382,13 @@ type
     procedure InitSize;
     procedure LoadLocations;
     procedure LoadRandomPresets;
+    procedure LoadUoaDesigns;
     procedure MoveBy(AOffsetX, AOffsetY: Integer); inline;
+    procedure MoveUoaDesign(AX, AY: Word; AZ: ShortInt);
+    procedure PlaceUoaDesign(AWorldItem: TWorldItem);
     procedure PrepareMapCell(AMapCell: TMapCell);
     procedure PrepareScreenBlock(ABlockInfo: PBlockInfo);
+    procedure PreviewUoaDesign(AWorldItem: TWorldItem);
     procedure ProcessToolState;
     procedure ProcessAccessLevel;
     procedure RebuildScreenBuffer;
@@ -411,10 +428,12 @@ type
     procedure InvalidateFilter;
     procedure InvalidateScreenBuffer;
     procedure RegisterAccessChangedListener(AListener: TAccessChangedListener);
+    procedure RegisterHoverListener(AListener: TSelectionListener);
     procedure RegisterSelectionListener(AListener: TSelectionListener);
     procedure SetPos(AX, AY: Word);
     procedure SwitchToSelection;
     procedure UnregisterAccessChangedListener(AListener: TAccessChangedListener);
+    procedure UnregisterHoverListener(AListener: TSelectionListener);
     procedure UnregisterSelectionListener(AListener: TSelectionListener);
   end; 
 
@@ -1023,13 +1042,18 @@ begin
   FRandomPresetsFile := FConfigDir + 'RandomPresets.xml';
   LoadRandomPresets;
 
+  LoadUoaDesigns;
+
   DoubleBuffered := True;
   pnlBottom.DoubleBuffered := True;
 
   FAccessChangedListeners := TAccessChangedListeners.Create;
+  FHoverListeners := TSelectionListeners.Create;
   FSelectionListeners := TSelectionListeners.Create;
   
   FLastDraw := Now;
+
+  pcLeft.ActivePage := tsTiles;
 end;
 
 procedure TfrmMain.btnGoToClick(Sender: TObject);
@@ -1138,6 +1162,11 @@ begin
   vdtRandom.EndUpdate;
 end;
 
+procedure TfrmMain.btnCancelUOAPlacementClick(Sender: TObject);
+begin
+  PlaceUoaDesign(nil);
+end;
+
 procedure TfrmMain.btnClearLocationsClick(Sender: TObject);
 begin
   if MessageDlg('Are you sure you want to delete all saved locations?',
@@ -1395,7 +1424,9 @@ begin
   FreeAndNil(FGLFont);
   FreeAndNil(FRandomPresetsDoc);
   FreeAndNil(FAccessChangedListeners);
+  FreeAndNil(FHoverListeners);
   FreeAndNil(FSelectionListeners);
+  FreeAndNil(FUoaDesigns);
   
   RegisterPacketHandler($0C, nil);
 end;
@@ -1974,6 +2005,80 @@ begin
   Stream.Write(locationInfo^.Name[1], stringLength);
 end;
 
+procedure TfrmMain.vstUoaDesignsDblClick(Sender: TObject);
+var
+  selectedNode: PVirtualNode;
+  designTile: TStaticItem;
+  virtualTile: TMovableGhostTile;
+begin
+  // Make sure to reset the current view first.
+  PreviewUoaDesign(nil);
+  acSelect.Checked := True;
+  EnableActions(False);
+
+  UnregisterSelectionListener(@PlaceUoaDesign);
+  UnregisterHoverListener(@PreviewUoaDesign);
+
+  selectedNode := vstUoaDesigns.GetFirstSelected();
+  if selectedNode = nil then
+    Exit;
+
+  FreeAndNil(FCurrentUoaDesign);
+  FreeAndNil(FCurrentUoaTiles);
+  FCurrentUoaDesign := FUoaDesigns.LoadDesign(FUoaDesigns.Headers[selectedNode^.Index]);
+  FCurrentUoaTiles := TStaticItemList.Create(False);
+
+  for designTile in FCurrentUoaDesign.Tiles do
+  begin
+    virtualTile := TMovableGhostTile.Create(nil, nil, 0, 0);
+    virtualTile.X := designTile.X;
+    virtualTile.Y := designTile.Y;
+    virtualTile.Z := designTile.Z;
+    virtualTile.OriginalX := designTile.X;
+    virtualTile.OriginalY := designTile.Y;
+    virtualTile.OriginalZ := designTile.Z;
+    virtualTile.TileID := designTile.TileID;
+    virtualTile.Hue := designTile.Hue;
+    FCurrentUoaTiles.Add(virtualTile);
+    FVirtualTiles.Add(virtualTile);
+  end;
+  MoveUoaDesign(FX, FY, FLandscape.GetLandAlt(FX, FY, 0));
+
+  RegisterSelectionListener(@PlaceUoaDesign);
+  RegisterHoverListener(@PreviewUoaDesign);
+
+  vstUoaDesigns.Enabled := False;
+  btnCancelUOAPlacement.Visible := True;
+end;
+
+procedure TfrmMain.vstUoaDesignsGetText(Sender: TBaseVirtualTree;
+  Node: PVirtualNode; Column: TColumnIndex; TextType: TVSTTextType;
+  var CellText: String);
+var
+  header: TUoaDesignHeader;
+
+  function BuildCategoryName: String;
+  begin
+    if header.Category <> EmptyStr then
+      Result := header.Category;
+
+    if header.Subcategory <> EmptyStr then
+    begin
+      if Result <> EmptyStr then
+        Result := Result + '/';
+      Result := Result + header.Subcategory;
+    end;
+  end;
+
+begin
+  header := FUoaDesigns.Headers[Node^.Index];
+
+  case Column of
+    0: CellText := header.Name;
+    1: CellText := BuildCategoryName;
+  end;
+end;
+
 procedure TfrmMain.XMLPropStorage1RestoreProperties(Sender: TObject);
 begin
   FTextureManager.UseAnims := mnuShowAnimations.Checked;
@@ -2018,9 +2123,16 @@ begin
   FAccessChangedListeners.Add(AListener);
 end;
 
+procedure TfrmMain.RegisterHoverListener(AListener: TSelectionListener);
+begin
+  if FHoverListeners.IndexOf(AListener) = -1 then
+    FHoverListeners.Add(AListener);
+end;
+
 procedure TfrmMain.RegisterSelectionListener(AListener: TSelectionListener);
 begin
-  FSelectionListeners.Add(AListener);
+  if FSelectionListeners.IndexOf(AListener) = -1 then
+    FSelectionListeners.Add(AListener);
 end;
 
 procedure TfrmMain.UnregisterAccessChangedListener(
@@ -2029,6 +2141,11 @@ begin
   FAccessChangedListeners.Remove(AListener);
 end;
 
+procedure TfrmMain.UnregisterHoverListener(AListener: TSelectionListener);
+begin
+  FHoverListeners.Remove(Alistener);
+end;
+
 procedure TfrmMain.UnregisterSelectionListener(AListener: TSelectionListener);
 begin
   FSelectionListeners.Remove(AListener);
@@ -2206,6 +2323,26 @@ begin
   end;
 end;
 
+procedure TfrmMain.LoadUoaDesigns;
+var
+  idxFile, binFile: String;
+  i: Integer;
+begin
+  idxFile := FAppDir + 'Designs.idx';
+  binFile := FAppDir + 'Designs.bin';
+
+  if (not FileExists(idxFile)) or (not FileExists(binFile)) then
+  begin
+    tsUoaDesigns.TabVisible := False;
+    Exit;
+  end;
+
+  FUoaDesigns := TUoaDesigns.Create(idxFile, binFile);
+  tsUoaDesigns.TabVisible := True;
+  for i := 1 to FUoaDesigns.Headers.Count do
+    vstUoaDesigns.AddChild(nil);
+end;
+
 procedure TfrmMain.MoveBy(AOffsetX, AOffsetY: Integer); inline;
 begin
   SetPos(EnsureRange(FX + AOffsetX, 0, FLandscape.CellWidth - 1),
@@ -2213,6 +2350,88 @@ begin
   UpdateCurrentTile;
 end;
 
+procedure TfrmMain.MoveUoaDesign(AX, AY: Word; AZ: ShortInt);
+var
+  offsetX, offsetY, offsetZ, maxZ: Integer;
+  item: TStaticItem;
+begin
+  maxZ := Low(Integer);
+  for item in FCurrentUoaDesign.Tiles do
+    if item.Z > maxZ then
+      maxZ := item.Z;
+
+  offsetX := AX - FCurrentUoaDesign.Header.Width div 2;
+  offsetY := AY - FCurrentUoaDesign.Header.Height div 2;
+  offsetZ := EnsureRange(AZ, -128, 127);
+
+  if offsetX < 0 then offsetX := 0;
+  if offsetX + FCurrentUoaDesign.Header.Width > FLandscape.CellWidth then
+    offsetX := FLandscape.CellWidth - FCurrentUoaDesign.Header.Width;
+  if offsetY < 0 then offsetY := 0;
+  if offsetY + FCurrentUoaDesign.Header.Height > FLandscape.CellHeight then
+    offsetY := FLandscape.CellHeight - FCurrentUoaDesign.Header.Height;
+  if offsetZ + maxZ > 127 then
+    offsetZ := 127 - maxZ;
+
+  for item in FCurrentUoaTiles do
+  begin
+    item.X := TMovableGhostTile(item).OriginalX + offsetX;
+    item.Y := TMovableGhostTile(item).OriginalY + offsetY;
+    item.Z := TMovableGhostTile(item).OriginalZ + offsetZ;
+  end;
+
+  InvalidateScreenBuffer;
+end;
+
+procedure TfrmMain.PlaceUoaDesign(AWorldItem: TWorldItem);
+var
+  selectedNode: PVirtualNode;
+  header: TUoaDesignHeader;
+  item: TWorldItem;
+  i: Integer;
+begin
+  UnregisterSelectionListener(@PlaceUoaDesign);
+  UnregisterHoverListener(@PreviewUoaDesign);
+  FreeAndNil(FCurrentUoaDesign);
+  FreeAndNil(FCurrentUoaTiles);
+  FCurrentUoaDesignAnchor := nil;
+  vstUoaDesigns.Enabled := True;
+  btnCancelUOAPlacement.Visible := False;
+  EnableActions(True);
+
+  selectedNode := vstUoaDesigns.GetFirstSelected();
+  if selectedNode = nil then
+    Exit;
+
+  if AWorldItem = nil then
+  begin
+    for i := FVirtualTiles.Count - 1 downto 0 do
+    begin
+      if FVirtualTiles[i] is TGhostTile then
+      begin
+        FScreenBuffer.Delete(FVirtualTiles[i]);
+        FVirtualTiles.Delete(i);
+      end;
+    end;
+    Exit;
+  end;
+
+  FUndoList.Clear;
+  for i := FVirtualTiles.Count - 1 downto 0 do
+  begin
+    item := FVirtualTiles[i];
+    if item is TGhostTile then
+    begin
+      dmNetwork.Send(TInsertStaticPacket.Create(TGhostTile(item)));
+      FUndoList.Add(TDeleteStaticPacket.Create(TGhostTile(item)));
+      FVirtualTiles.Delete(i);
+      FScreenBuffer.Delete(item);
+    end;
+  end;
+
+  vstUoaDesigns.ClearSelection;
+end;
+
 procedure TfrmMain.PrepareMapCell(AMapCell: TMapCell);
 var
   current, north, east, west: PBlockInfo;
@@ -2473,6 +2692,23 @@ begin
   end;
 end;
 
+procedure TfrmMain.PreviewUoaDesign(AWorldItem: TWorldItem);
+begin
+  // If nothing has changed, we can keep this short.
+  if FCurrentUoaDesignAnchor = AWorldItem then
+    Exit;
+  FCurrentUoaDesignAnchor := AWorldItem;
+
+  // No design selected? Well then.
+  if FCurrentUoaDesign = nil then
+    Exit;
+
+  if AWorldItem = nil then
+    Exit;
+
+  MoveUoaDesign(AWorldItem.X, AWorldItem.Y, AWorldItem.Z);
+end;
+
 procedure TfrmMain.Render;
 var
   highlight: Boolean;
@@ -2965,6 +3201,7 @@ end;
 procedure TfrmMain.UpdateCurrentTile(AX, AY: Integer);
 var
   blockInfo: PBlockInfo;
+  listener: TSelectionListener;
 begin
   //Logger.EnterMethod([lcClient, lcDebug], 'UpdateCurrentTile');
   FOverlayUI.ActiveArrow := FOverlayUI.HitTest(AX, AY);
@@ -2982,6 +3219,9 @@ begin
   else
     CurrentTile := nil;
 
+  for listener in FHoverListeners do
+    listener(CurrentTile);
+
   //Logger.ExitMethod([lcClient, lcDebug], 'UpdateCurrentTile');
 end;
 
@@ -3181,9 +3421,11 @@ var
 begin
   //Logger.EnterMethod([lcClient, lcDebug], 'UpdateSelection');
 
-  //If the current tile is nil, but we still have a selected tile, the
-  //procedure is pointless - the selection should stay intact.
-  if (CurrentTile <> nil) or (SelectedTile = nil) then
+  // If the current tile is nil, but we still have a selected tile, the
+  // procedure is pointless - the selection should stay intact.
+  // Same if we are currently placing a UOA design, since we reuse the virtual
+  // tile and just update its position.
+  if ((CurrentTile <> nil) or (SelectedTile = nil)) and (FCurrentUoaTiles = nil) then
   begin
     if CurrentTile = nil then
       selectedRect := Rect(-1, -1, -1, -1)
@@ -3410,6 +3652,15 @@ begin
     oglGameWindowMouseLeave(nil);
 end;
 
+procedure TfrmMain.EnableActions(AEnabled: Boolean);
+begin
+  acSelect.Enabled := AEnabled;
+  acMove.Enabled := AEnabled;
+  acElevate.Enabled := AEnabled;
+  acDelete.Enabled := AEnabled;
+  acHue.Enabled := AEnabled;
+end;
+
 function TfrmMain.FindRandomPreset(AName: String): TDOMElement;
 var
   preset: TDOMElement;