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ChessBoardUnit.pas
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////////////////////////////////////////////////////////////////////////////////
// All code below is exclusively owned by author of Chess4Net - Pavel Perminov
// Any changes, modifications, borrowing and adaptation are a subject for
// explicit permition from the owner.
unit ChessBoardUnit;
interface
uses
Forms, ExtCtrls, Classes, Controls, Graphics, Types, Messages,
//
ChessRulesEngine, BitmapResUnit, PromotionUnit;
type
TMode = (mView, mGame, mAnalyse, mEdit); // Board mode
TAnimation = (aNo, aSlow, aQuick);
TChessBoardEvent = (cbeMate, cbeStaleMate, cbeMoved, cbePosSet, cbeMenu);
TChessBoardHandler = procedure(e: TChessBoardEvent;
d1: pointer = nil; d2: pointer = nil) of object;
TChessBoardLayerBase = class;
TChessBoard = class(TForm, IChessRulesEngineable)
PBoxBoard: TPaintBox;
AnimateTimer: TTimer;
procedure FormCreate(Sender: TObject);
procedure FormDestroy(Sender: TObject);
procedure FormCanResize(Sender: TObject; var NewWidth,
NewHeight: Integer; var Resize: Boolean);
procedure FormResize(Sender: TObject);
procedure AnimateTimerTimer(Sender: TObject);
procedure PBoxBoardPaint(Sender: TObject);
procedure PBoxBoardDragDrop(Sender, Source: TObject; X, Y: Integer);
procedure PBoxBoardDragOver(Sender, Source: TObject; X, Y: Integer;
State: TDragState; var Accept: Boolean);
procedure PBoxBoardEndDrag(Sender, Target: TObject; X, Y: Integer);
procedure PBoxBoardMouseDown(Sender: TObject;
Button: TMouseButton; Shift: TShiftState; X, Y: Integer);
procedure PBoxBoardMouseMove(Sender: TObject; Shift: TShiftState; X, Y: Integer);
procedure PBoxBoardMouseUp(Sender: TObject; Button: TMouseButton;
Shift: TShiftState; X, Y: Integer);
procedure PBoxBoardStartDrag(Sender: TObject; var DragObject: TDragObject);
private
m_ChessRulesEngine: TChessRulesEngine;
m_BitmapRes: TBitmapRes; // Manager for bitmaps
FHandler: TChessBoardHandler;
dx, dy: integer; // Ðàññòîÿíèå îò êóðñîðà äî âåðõíåãî ëåâîãî óãëà
x0, y0: integer; // Ïðåäûäóùèå êîîðäèíàòû êóðñîðà
_flipped: boolean; // Äîñêà ïåðåâ¸ðíóòà èëè íåò
m_bHilighted: boolean; // Hilight the move that is being done
m_i0, m_j0: integer;
m_fig: TFigure;
m_Mode: TMode;
m_bViewGaming: boolean;
m_bmHiddenBoard: TBitmap;
m_bmChessBoard: TBitmap;
m_bmFigure: array[TFigure] of TBitmap;
m_bmBuf: TBitmap;
m_iSquareSize: integer; // Size of one chess board field
m_animation: TAnimation; // Animation speed
m_iAnimStep, m_iPrevAnimStep, m_iAnimStepsCount: integer;
anim_dx, anim_dy: real; // Variables for animation of a dragged piece
m_PlayerColor: TFigureColor; // Color of player client
m_bDraggedMoved: boolean; // Flag for switching of dragging
last_hilight: boolean; // Flag for hilighting of the last move done
coord_show: boolean; // Flag for showing coordinates
// Resizing
m_ResizingType: (rtNo, rtHoriz, rtVert);
m_iDeltaWidthHeight: integer;
m_bDeltaWidthHeightFlag: boolean;
m_PromotionForm: TPromotionForm;
m_EditPiece: TFigure;
m_iUpdateCounter: integer;
m_lstLayers: TList;
procedure HilightLastMove;
procedure Evaluate;
function FGetLastMove: PMoveAbs;
property lastMove: PMoveAbs read FGetLastMove;
function FGetPosition: PChessPosition;
property Position: PChessPosition read FGetPosition;
function AskPromotionFigure(FigureColor: TFigureColor): TFigureName;
procedure FSetMode(const Value: TMode);
function FDoMove(i, j: integer; prom_fig: TFigureName = K): boolean;
procedure FOnAfterMoveDone;
procedure FOnAfterSetPosition;
procedure FOnInitPosition;
procedure FAnimate(const i, j: integer); // Animates a disposition of a piece from (i0,j0) to (i,j)
procedure FDoAnimationStep;
procedure FEndAnimation;
procedure FWhatSquare(const P: TPoint; var i: Integer; var j: Integer);
procedure FSetPlayerColor(const Value: TFigureColor);
procedure FCancelAnimationDragging; // Caneling of animation and dragging for trace removal after draw
procedure FSetFlipped(Value: boolean); // Flips chess position
procedure FSetCoordinatesShown(Value: boolean);
procedure FSetLastMoveHilighted(Value: boolean);
function FGetPositionsList: TList;
function FGetPositionColor: TFigureColor;
function FGetMoveNotationFormat: TMoveNotationFormat;
procedure FSetMoveNotationFormat(Value: TMoveNotationFormat);
function FGetFENFormat: boolean;
procedure FSetFENFormat(bValue: boolean);
procedure FDrawHiddenBoard;
function FGetHiddenBoardCanvas: TCanvas;
procedure FDrawBoard;
procedure FOnDrawLayerUpdate(const ADrawLayer: TChessBoardLayerBase);
function FGetMovesOffset: integer;
function FGetColorStarts: TFigureColor;
procedure WMSizing(var Msg: TMessage); message WM_SIZING;
procedure FDoHandler(e: TChessBoardEvent; d1: pointer = nil; d2: pointer = nil);
property SquareSize: integer read m_iSquareSize;
property PositionsList: TList read FGetPositionsList;
public
constructor Create(Owner: TComponent; AHandler: TChessBoardHandler = nil); reintroduce;
function DoMove(const strMove: string): boolean;
procedure ResetMoveList;
function SetPosition(const strPosition: string): boolean;
function GetPosition: string;
procedure InitPosition;
procedure PPRandom;
procedure TakeBack;
function NMoveDone: integer;
function NPlysDone: integer;
function IsMoveAnimating: boolean;
procedure BeginUpdate;
procedure EndUpdate;
procedure AddLayer(const ALayer: TChessBoardLayerBase);
procedure RemoveLayer(const ALayer: TChessBoardLayerBase);
property PlayerColor: TFigureColor read m_PlayerColor write FSetPlayerColor;
property Mode: TMode read m_Mode write FSetMode;
property CoordinatesShown: boolean read coord_show write FSetCoordinatesShown;
property Flipped: boolean read _flipped write FSetFlipped;
property LastMoveHilighted: boolean read last_hilight write FSetLastMoveHilighted;
property Animation: TAnimation read m_animation write m_animation;
property ViewGaming: boolean read m_bViewGaming write m_bViewGaming;
property PositionColor: TFigureColor read FGetPositionColor; // Whos move it is in the current position
property MoveNotationFormat: TMoveNotationFormat
read FGetMoveNotationFormat write FSetMoveNotationFormat;
property MovesOffset: integer read FGetMovesOffset;
property FENFormat: boolean read FGetFENFormat write FSetFENFormat;
property EditPiece: TFigure read m_EditPiece write m_EditPiece;
end;
TChessBoardLayerBase = class
private
m_ChessBoard: TChessBoard;
function FGetSquareSize: integer;
function FGetCanvas: TCanvas;
function FGetPosition: PChessPosition;
function FGetPositionsList: TList;
protected
procedure RDraw; virtual; abstract;
function RGetColorStarts: TFigureColor;
procedure RDoUpdate;
procedure ROnAfterMoveDone; virtual;
procedure ROnAfterSetPosition; virtual;
procedure ROnAfterModeSet(const OldValue, NewValue: TMode); virtual;
procedure ROnResetMoveList; virtual;
procedure ROnInitPosition; virtual;
property ChessBoard: TChessBoard read m_ChessBoard write m_ChessBoard;
property SquareSize: integer read FGetSquareSize;
property Canvas: TCanvas read FGetCanvas;
property Position: PChessPosition read FGetPosition;
property PositionsList: TList read FGetPositionsList;
end;
implementation
{$R *.dfm}
uses
Math, SysUtils, Windows,
//
ChessBoardHeaderUnit;
const
HILIGHT_WIDTH = 1;
HILIGHT_COLOR: TColor = clRed;
HILIGHT_LAST_MOVE_WIDTH = 1;
HILIGHT_LAST_MOVE_COLOR: TColor = clBlue;
ANIMATION_SLOW = 30; // Time of animation in frames >= 1
ANIMATION_QUICK = 9;
CHB_WIDTH = 4;
////////////////////////////////////////////////////////////////////////////////
// TChessBoard
constructor TChessBoard.Create(Owner: TComponent; AHandler: TChessBoardHandler = nil);
begin
FHandler := AHandler;
inherited Create(Owner);
end;
procedure TChessBoard.AnimateTimerTimer(Sender: TObject);
begin
FDoAnimationStep;
if (m_iAnimStep >= m_iAnimStepsCount) then
FEndAnimation;
end;
procedure TChessBoard.FDoAnimationStep;
var
iX, iY: integer;
rect: TRect;
begin
if (m_iAnimStep < m_iAnimStepsCount) then
begin
inc(m_iAnimStep);
iX := round(x0 + anim_dx * m_iAnimStep);
iY := round(y0 + anim_dy * m_iAnimStep);
dx := iX - x0 - Round(anim_dx * m_iPrevAnimStep);
dy := iY - y0 - Round(anim_dy * m_iPrevAnimStep);
// Âîññòàíîâèòü ôðàãìåíò íà m_bmHiddenBoard
m_bmHiddenBoard.Canvas.Draw(iX - dx, iY - dy, m_bmBuf);
// Êîïèðîâàòü íîâûé ôðàãìåíò â áóôåð
m_bmBuf.Canvas.CopyRect(Bounds(0, 0, m_iSquareSize, m_iSquareSize),
m_bmHiddenBoard.Canvas, Bounds(iX, iY, m_iSquareSize, m_iSquareSize));
// Íàðèñîâàòü ïåðåòàñêèâàåìóþ ôèãóðó â íîâîé ïîçèöèè
m_bmHiddenBoard.Canvas.Draw(iX, iY, m_bmFigure[m_fig]);
// Ïåðåíåñòè íîâûé ôðàãìåíò íà ýêðàí
rect := Bounds(Min(iX - dx, iX), Min(iY - dy, iY),
abs(dx) + m_iSquareSize, abs(dy) + m_iSquareSize);
PBoxBoard.Canvas.CopyRect(rect, m_bmHiddenBoard.Canvas, rect);
end;
m_iPrevAnimStep := m_iAnimStep;
end;
procedure TChessBoard.FEndAnimation;
begin
AnimateTimer.Enabled := FALSE;
m_iAnimStep := m_iAnimStepsCount;
FDrawBoard;
HilightLastMove;
Evaluate;
end;
procedure TChessBoard.FDrawBoard;
var
i: integer;
begin
if (csDestroying in ComponentState) then
exit;
if (m_iUpdateCounter > 0) then
exit;
FDrawHiddenBoard;
for i := 0 to m_lstLayers.Count - 1 do
TChessBoardLayerBase(m_lstLayers[i]).RDraw;
PBoxBoardPaint(nil);
end;
procedure TChessBoard.HilightLastMove;
var
i, j, l,
_i0, _j0, x, y: integer;
begin
if (not (m_Mode in [mGame, mAnalyse])) then
exit;
// Output the last move done
if (last_hilight and (lastMove.i0 <> 0)) then
begin
if (_flipped) then
begin
_i0 := 9 - lastMove.i0;
_j0 := lastMove.j0;
i := 9 - lastMove.i;
j := lastMove.j;
end
else
begin
_i0 := lastMove.i0;
_j0 := 9 - lastMove.j0;
i := lastMove.i;
j := 9 - lastMove.j;
end;
x := m_iSquareSize * (_i0 - 1) + CHB_X;
y := m_iSquareSize * (_j0 - 1) + CHB_Y;
m_bmHiddenBoard.Canvas.Pen.Color := HILIGHT_LAST_MOVE_COLOR;
m_bmHiddenBoard.Canvas.Pen.Width := HILIGHT_LAST_MOVE_WIDTH;
for l := 1 to 2 do
with m_bmHiddenBoard.Canvas do
begin
MoveTo(x, y);
LineTo(x + m_iSquareSize - 1, y);
LineTo(x + m_iSquareSize - 1, y + m_iSquareSize - 1);
LineTo(x, y + m_iSquareSize - 1);
LineTo(x, y);
x := m_iSquareSize * (i - 1) + CHB_X;
y := m_iSquareSize * (j - 1) + CHB_Y;
end;
PBoxBoardPaint(nil);
end;
end;
procedure TChessBoard.FDrawHiddenBoard;
var
i, j: integer;
x, y: integer;
begin
if (not Assigned(m_bmHiddenBoard)) then
exit;
// Copy empty board to the hidden one
with m_bmHiddenBoard do
begin
Canvas.CopyRect(Bounds(0,0, Width,Height), m_bmChessBoard.Canvas, Bounds(0,0, Width,Height));
end;
// Draw coordinates
if (coord_show) then
with m_bmHiddenBoard, m_bmHiddenBoard.Canvas do
begin
x:= CHB_X + m_iSquareSize div 2;
y:= (m_bmHiddenBoard.Height + CHB_Y + 8 * m_iSquareSize + CHB_WIDTH) div 2;
if _flipped then j := ord('h')
else j:= ord('a');
for i:= 1 to 8 do // áóêâû
begin
TextOut(x - TextWidth(chr(j)) div 2,
y + 1 - TextHeight(chr(j)) div 2 , chr(j));
x := x + m_iSquareSize;
if _flipped then dec(j)
else inc(j);
end;
x:= (CHB_X - CHB_WIDTH) div 2;
y:= CHB_Y + m_iSquareSize div 2;
if _flipped then j:= ord('1')
else j := ord('8');
for i := 1 to 8 do // öèôðû
begin
TextOut(x - TextWidth(chr(j)) div 2,
y - TextHeight(chr(j)) div 2, chr(j));
y:= y + m_iSquareSize;
if _flipped then inc(j)
else dec(j);
end;
end;
// Draw pieces
for i := 1 to 8 do
for j := 1 to 8 do
begin
if ((Position.board[i,j] = ES)) then
continue; // There's nothing to draw
if not _flipped then // Çàãðóçèòü íóæíóþ ôèãóðó èç ðåñóðñà è íàðèñîâàòü
m_bmHiddenBoard.Canvas.Draw(CHB_X + m_iSquareSize * (i-1),
CHB_Y + m_iSquareSize * (8-j),
m_bmFigure[Position.board[i,j]])
else // Black is below
m_bmHiddenBoard.Canvas.Draw(CHB_X + m_iSquareSize * (8-i),
CHB_Y + m_iSquareSize * (j-1),
m_bmFigure[Position.board[i,j]]);
end;
end;
function TChessBoard.FGetHiddenBoardCanvas: TCanvas;
begin
if (Assigned(m_bmHiddenBoard)) then
Result := m_bmHiddenBoard.Canvas
else
Result := nil;
end;
procedure TChessBoard.Evaluate;
begin
case m_ChessRulesEngine.GetEvaluation of
evMate:
FDoHandler(cbeMate, self);
evStaleMate:
FDoHandler(cbeStaleMate, self);
end;
end;
procedure TChessBoard.PBoxBoardPaint(Sender: TObject);
begin
PBoxBoard.Canvas.Draw(0, 0, m_bmHiddenBoard); // Draw hidden board on the form
// PBoxBoard.Canvas.StretchDraw(Bounds(0, 0, PBoxBoard.Width, PBoxBoard.Height), m_bmHiddenBoard);
end;
function TChessBoard.FGetLastMove: PMoveAbs;
begin
Result := m_ChessRulesEngine.lastMove;
end;
function TChessBoard.FGetPosition: PChessPosition;
begin
Result := m_ChessRulesEngine.Position;
end;
function TChessBoard.AskPromotionFigure(FigureColor: TFigureColor): TFigureName;
var
frmOwner: TForm;
begin
if (Owner is TForm) then
frmOwner := TForm(Owner)
else
frmOwner := self;
if (Showing) then
begin
m_PromotionForm := TPromotionForm.Create(frmOwner, m_BitmapRes);
try
Result := m_PromotionForm.ShowPromotion(FigureColor);
finally
FreeAndNil(m_PromotionForm);
end;
end
else
Result := Q;
end;
procedure TChessBoard.FSetPlayerColor(const Value: TFigureColor);
begin
FCancelAnimationDragging;
m_PlayerColor := Value;
if (m_PlayerColor = fcWhite) then
FSetFlipped(FALSE)
else // fcBlack
FSetFlipped(TRUE);
end;
procedure TChessBoard.FCancelAnimationDragging;
begin
// Cancel animation and dragging
if (AnimateTimer.Enabled) then
begin
AnimateTimer.Enabled := FALSE;
// iAnimStep := iAnimStepsCount;
// AnimateTimerTimer(nil);
end;
if (PBoxBoard.Dragging) then
begin
m_bDraggedMoved := FALSE;
PBoxBoard.EndDrag(FALSE);
end;
end;
procedure TChessBoard.FSetFlipped(Value: boolean);
begin
// TODO: ???
_flipped := Value;
FDrawBoard;
end;
procedure TChessBoard.FSetMode(const Value: TMode);
var
OldMode: TMode;
i: integer;
begin
if (m_Mode = Value) then
exit;
OldMode := m_Mode;
m_Mode := Value;
if ((m_Mode in [mView, mEdit]) and (Assigned(m_PromotionForm))) then
m_PromotionForm.Close;
for i := 0 to m_lstLayers.Count - 1 do
TChessBoardLayerBase(m_lstLayers[i]).ROnAfterModeSet(OldMode, m_Mode);
FDrawBoard;
HilightLastMove;
end;
procedure TChessBoard.FSetCoordinatesShown(Value: boolean);
begin
coord_show := Value;
FDrawBoard;
HilightLastMove;
end;
procedure TChessBoard.FSetLastMoveHilighted(Value: boolean);
begin
last_hilight := Value;
FDrawBoard;
HilightLastMove;
end;
function TChessBoard.DoMove(const strMove: string): boolean;
begin
Result := FALSE;
if (m_Mode = mEdit) then
exit;
// Animation canceling
if (AnimateTimer.Enabled) then
FEndAnimation;
Result := m_ChessRulesEngine.DoMove(strMove);
if (Result) then
begin
FOnAfterMoveDone;
FAnimate(lastMove.i, lastMove.j);
end;
end;
procedure TChessBoard.FOnAfterMoveDone;
var
_fig: TFigure;
strLastMove: string;
i: integer;
begin
m_i0 := lastMove.i0;
m_j0 := lastMove.j0;
_fig := Position.board[lastMove.i, lastMove.j];
if (lastMove.prom_fig in [Q, R, B, N]) then
begin
if (_fig < ES) then
m_fig := WP
else
m_fig := BP;
end
else
m_fig := _fig;
strLastMove := m_ChessRulesEngine.LastMoveStr;
FDoHandler(cbeMoved, @strLastMove, self);
if (m_Mode = mAnalyse) then
m_PlayerColor := PositionColor;
for i := 0 to m_lstLayers.Count - 1 do
TChessBoardLayerBase(m_lstLayers[i]).ROnAfterMoveDone;
end;
procedure TChessBoard.FAnimate(const i, j: integer);
var
x, y: integer;
begin
if (not Showing) then
exit;
if ((m_i0 = 0) or (m_j0 = 0)) then
exit;
if (AnimateTimer.Enabled) then
begin
m_iAnimStep := m_iAnimStepsCount;
exit;
end;
case animation of
aNo:
m_iAnimStepsCount := 1;
aSlow:
m_iAnimStepsCount := ANIMATION_SLOW;
aQuick:
m_iAnimStepsCount := ANIMATION_QUICK;
end;
if (_flipped) then
begin
x0 := (8 - m_i0) * m_iSquareSize + CHB_X;
y0 := (m_j0 - 1) * m_iSquareSize + CHB_Y;
x := (8 - i) * m_iSquareSize + CHB_X;
y := (j - 1) * m_iSquareSize + CHB_Y;
end
else
begin
x0 := (m_i0 - 1) * m_iSquareSize + CHB_X;
y0 := (8 - m_j0) * m_iSquareSize + CHB_Y;
x := (i - 1) * m_iSquareSize + CHB_X;
y := (8 - j) * m_iSquareSize + CHB_Y;
end;
anim_dx := (x - x0) / m_iAnimStepsCount;
anim_dy := (y - y0) / m_iAnimStepsCount;
m_iAnimStep := 0;
m_iPrevAnimStep := m_iAnimStep;
// Copy image of the empty square to m_bmBuf
m_bmBuf.Width := m_iSquareSize;
m_bmBuf.Height := m_iSquareSize;
if (((m_i0 + m_j0) and 1) <> 0) then
m_bmBuf.Canvas.CopyRect(Bounds(0, 0, m_iSquareSize, m_iSquareSize),
m_bmFigure[ES].Canvas, Bounds(0, 0, m_iSquareSize, m_iSquareSize))
else
m_bmBuf.Canvas.CopyRect(Bounds(0, 0, m_iSquareSize, m_iSquareSize),
m_bmFigure[ES].Canvas, Bounds(m_iSquareSize, 0, m_iSquareSize, m_iSquareSize));
AnimateTimer.Enabled := TRUE;
end;
procedure TChessBoard.ResetMoveList;
var
i: integer;
begin
m_ChessRulesEngine.ResetMoveList;
for i := 0 to m_lstLayers.Count - 1 do
TChessBoardLayerBase(m_lstLayers[i]).ROnResetMoveList;
end;
function TChessBoard.SetPosition(const strPosition: string): boolean;
begin
Result := m_ChessRulesEngine.SetPosition(strPosition);
if (Result) then
begin
FCancelAnimationDragging;
FOnAfterSetPosition;
FDrawBoard;
end;
end;
function TChessBoard.GetPosition: string;
begin
Result := m_ChessRulesEngine.GetPosition;
end;
procedure TChessBoard.FOnAfterSetPosition;
var
strPosition: string;
i: integer;
begin
case m_Mode of
mAnalyse:
m_PlayerColor := PositionColor;
mEdit:
ResetMoveList;
end;
m_i0 := 0;
m_j0 := 0;
strPosition := GetPosition;
FDoHandler(cbePosSet, @strPosition, self);
for i := 0 to m_lstLayers.Count - 1 do
TChessBoardLayerBase(m_lstLayers[i]).ROnAfterSetPosition;
end;
procedure TChessBoard.FOnInitPosition;
var
i: integer;
begin
for i := 0 to m_lstLayers.Count - 1 do
TChessBoardLayerBase(m_lstLayers[i]).ROnInitPosition;
end;
procedure TChessBoard.FormCreate(Sender: TObject);
begin
// m_iDeltaWidthHeight := Width - Height;
m_BitmapRes := TBitmapRes.Create(Size(PBoxBoard.Width, PBoxBoard.Height));
coord_show:= TRUE;
last_hilight:= FALSE;
m_animation := aQuick;
m_ChessRulesEngine := TChessRulesEngine.Create(self);
m_lstLayers := TList.Create;
end;
procedure TChessBoard.FormDestroy(Sender: TObject);
var
_fig: TFigure;
i: integer;
begin
for i := m_lstLayers.Count - 1 downto 0 do
RemoveLayer(m_lstLayers[i]);
m_lstLayers.Free;
m_ChessRulesEngine.Free;
m_bmHiddenBoard.Free;
m_bmBuf.Free;
for _fig := Low(TFigure) to High(TFigure) do
m_bmFigure[_fig].Free;
m_bmChessBoard.Free;
m_BitmapRes.Free;
end;
procedure TChessBoard.PBoxBoardDragDrop(Sender, Source: TObject; X,
Y: Integer);
var
i, j: Integer;
begin
FWhatSquare(Point(X, Y), i, j);
case m_Mode of
mGame, mAnalyse:
begin
if (FDoMove(i, j)) then
m_bDraggedMoved := TRUE;
end;
mEdit:
m_bDraggedMoved := TRUE;
end;
end;
procedure TChessBoard.FWhatSquare(const P: TPoint;
var i: Integer; var j: Integer);
begin
with P do
begin
i := (X - CHB_X + m_iSquareSize) div m_iSquareSize;
j := 8 - (Y - CHB_Y) div m_iSquareSize;
if (_flipped) then
begin
i := 9 - i;
j := 9 - j;
end;
end;
end;
function TChessBoard.FDoMove(i, j: integer; prom_fig: TFigureName = K): boolean;
begin
Result := m_ChessRulesEngine.DoMove(m_i0, m_j0, i, j, prom_fig);
if (Result) then
FOnAfterMoveDone;
end;
procedure TChessBoard.PBoxBoardDragOver(Sender, Source: TObject; X,
Y: Integer; State: TDragState; var Accept: Boolean);
var
rect: TRect;
i, j: integer;
begin
case State of
dsDragEnter:
m_bHilighted := FALSE;
dsDragMove:
begin
// Repaint a fragment on m_bmHiddenBoard
m_bmHiddenBoard.Canvas.Draw(x0 - dx, y0 - dy, m_bmBuf);
// Copy new fragment to the buffer
m_bmBuf.Canvas.CopyRect(Bounds(0, 0, m_iSquareSize, m_iSquareSize),
m_bmHiddenBoard.Canvas, Bounds(X - dx, Y - dy, m_iSquareSize, m_iSquareSize));
// Draw the dragging piece in a new position
m_bmHiddenBoard.Canvas.Draw(X - dx, Y - dy, m_bmFigure[m_fig]);
// Copy the new fragment to the screen
rect:= Bounds(Min(x0,X) - dx, Min(y0, Y) - dy,
abs(X - x0) + m_iSquareSize, abs(Y - y0) + m_iSquareSize);
PBoxBoard.Canvas.CopyRect(rect, m_bmHiddenBoard.Canvas, rect);
x0 := X;
y0 := Y;
FWhatSquare(Point(X,Y), i, j);
Accept := ((i in [1..8]) and (j in [1..8]));
end;
end;
end;
procedure TChessBoard.PBoxBoardEndDrag(Sender, Target: TObject; X, Y: Integer);
var
i, j: integer;
bRes: boolean;
begin
case m_Mode of
mGame, mAnalyse:
begin
if (m_bHilighted) then
begin
with m_bmHiddenBoard.Canvas do
begin
Pen.Color:= HILIGHT_COLOR;
Pen.Width := HILIGHT_WIDTH;
x0:= x0 - dx;
y0:= y0 - dy;
MoveTo(x0,y0);
LineTo(x0 + m_iSquareSize - 1, y0);
LineTo(x0 + m_iSquareSize - 1, y0 + m_iSquareSize - 1);
LineTo(x0, y0 + m_iSquareSize - 1);
LineTo(x0, y0);
PBoxBoardPaint(nil);
end;
end
else
begin
if (AnimateTimer.Enabled) then
AnimateTimer.Enabled := FALSE;
FDrawBoard;
if (m_bDraggedMoved) then
begin
HilightLastMove;
Evaluate;
m_bDraggedMoved := FALSE;
end;
end;
end;
mEdit:
begin
if (m_bDraggedMoved) then
begin
FWhatSquare(Point(X, Y), i, j);
bRes := (((i <> m_i0) or (j <> m_j0)) and Position.SetPiece(i, j, m_fig));
end
else
bRes := TRUE;
if (bRes) then
begin
Position.SetPiece(m_i0, m_j0, ES);
FOnAfterSetPosition;
end;
FDrawBoard;
end;
end; // case
end;
procedure TChessBoard.PBoxBoardMouseDown(Sender: TObject;
Button: TMouseButton; Shift: TShiftState; X, Y: Integer);
var
i, j: Integer;
f: TFigure;
begin
if (Button <> mbLeft) then
exit;
FWhatSquare(Point(X, Y), i, j);
if (not ((i in [1..8]) and (j in [1..8]))) then
exit;
m_bDraggedMoved := FALSE;
f := Position.board[i,j];
case m_Mode of
mGame, mAnalyse:
begin
if (m_bViewGaming) then
exit;
if ((Position.color <> m_PlayerColor) or
(((Position.color <> fcWhite) or (f >= ES)) and
((Position.color <> fcBlack) or (f <= ES)))) then
exit;
if ((i = m_i0) and (j = m_j0)) then
m_bHilighted := (m_bHilighted xor TRUE)
else
m_bHilighted := TRUE;
end;
mEdit:
begin
if (f = ES) then
exit;
end;
else
exit;
end;
if (m_iAnimStep < m_iAnimStepsCount) then
FEndAnimation;
m_fig := f;
m_i0 := i;
m_j0 := j;
dx := (X - CHB_X) mod m_iSquareSize;
dy := (Y - CHB_Y) mod m_iSquareSize;
x0 := X;
y0 := Y;
m_bDraggedMoved := TRUE;
PBoxBoard.BeginDrag(FALSE);
end;
procedure TChessBoard.PBoxBoardMouseMove(Sender: TObject; Shift: TShiftState;
X, Y: Integer);
var
f: TFigure;
i,j: Integer;
begin
FWhatSquare(Point(X,Y), i,j);
if (not ((i in [1..8]) and (j in [1..8]))) then
begin
PBoxBoard.Cursor:= crDefault;
exit;
end;
f := Position.board[i,j];
case m_Mode of
mGame, mAnalyse:
begin
if (m_bViewGaming) then
exit;
if (m_PlayerColor = Position.color) and
(((Position.color = fcWhite) and (f < ES)) or
((Position.color = fcBlack) and (f > ES))) then
PBoxBoard.Cursor:= crHandPoint
else
PBoxBoard.Cursor:= crDefault;
end;
mEdit:
begin
if (f <> ES) then
PBoxBoard.Cursor:= crHandPoint
else
PBoxBoard.Cursor:= crDefault;