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unit BitmapResUnit;
interface
uses
Graphics, Types,
// Chess4Net
ChessBoardHeaderUnit, ChessRulesEngine;
type
// Bitmap resources - introduced for 2009.1 (sizable board feature)
TBitmapRes = class // parametrizable class factory
private
m_ResSet: TBitmap;
m_iSetNumber: integer;
m_iSquareSize: integer;
procedure FCalculateClientBoardSizes(InitialSize: TSize);
public
constructor Create(const ClientBoardSize: TSize);
destructor Destroy; override;
procedure CreateBoardBitmap(ClientBoardSize: TSize; const BackgroundColor: TColor;
out Bitmap: TBitmap);
procedure CreateFigureBitmap(const Figure: TFigure; out Bitmap: TBitmap);
function GetOptimalBoardSize(ClientSize: TSize): TSize;
property SquareSize: integer read m_iSquareSize;
end;
implementation
{$R ChessSet_PNG.RES}
uses
SysUtils, Classes, Math, pngimage;
{$J+}
const
CHB_RES_X = 4; CHB_RES_Y = 4; // starting coordinates of A8 field in resources
var
g_BitmapResInstance: TBitmapRes = nil;
arrClientBoardSizes: array[1..7] of TSize;
bClientBoardSizesCalculated: boolean = FALSE;
////////////////////////////////////////////////////////////////////////////////
// TBitmapRes
constructor TBitmapRes.Create(const ClientBoardSize: TSize);
begin
if (not bClientBoardSizesCalculated) then
FCalculateClientBoardSizes(ClientBoardSize);
end;
destructor TBitmapRes.Destroy;
begin
m_ResSet.Free;
inherited;
end;
procedure TBitmapRes.CreateBoardBitmap(ClientBoardSize: TSize; const BackgroundColor: TColor;
out Bitmap: TBitmap);
var
Png: TPngObject;
ResBoard: TBitmap;
begin
Png := nil;
ResBoard := nil;
m_iSquareSize := 0;
GetOptimalBoardSize(ClientBoardSize); // To refresh m_iSetNumber
if (m_iSetNumber = 0) then
exit;
Bitmap := TBitMap.Create;
with Bitmap do
try
Png := TPngObject.Create;
Png.LoadFromResourceName(HInstance, 'BOARD' + IntToStr(m_iSetNumber));
ResBoard := TBitmap.Create;
ResBoard.Assign(Png);
Width := arrClientBoardSizes[m_iSetNumber].cx;
Height := arrClientBoardSizes[m_iSetNumber].cy;
Canvas.Brush.Color := BackgroundColor;
Canvas.FillRect(Bounds(0, 0, Width, Height));
Canvas.Draw(CHB_X - CHB_RES_X, CHB_Y - CHB_RES_Y, ResBoard);
// Load appropriate set
FreeAndNil(m_ResSet);
Png.LoadFromResourceName(HInstance, 'SET' + IntToStr(m_iSetNumber));
m_ResSet := TBitmap.Create;
m_ResSet.Assign(Png);
m_iSquareSize := m_ResSet.Height;
finally;
ResBoard.Free;
Png.Free;
end;
end;
procedure TBitmapRes.CreateFigureBitmap(const Figure: TFigure; out Bitmap: TBitmap);
const
PNG_SET_POS: array[TFigure] of integer = (2, 4, 6, 8, 10, 12, 0, 3, 5, 7, 9, 11, 13);
var
iSquareSize, iWidth: integer;
begin
if (m_iSetNumber = 0) then
exit;
iSquareSize := m_ResSet.Height;
iWidth := IfThen((Figure = ES), iSquareSize + iSquareSize, iSquareSize);
Bitmap := TBitMap.Create;
Bitmap.Width := iWidth;
Bitmap.Height := iSquareSize;
Bitmap.Canvas.CopyRect(Bounds(0, 0, iWidth, iSquareSize), m_ResSet.Canvas,
Bounds(iSquareSize * PNG_SET_POS[Figure], 0, iWidth, iSquareSize));
Bitmap.Transparent:= TRUE;
end;
function TBitmapRes.GetOptimalBoardSize(ClientSize: TSize): TSize;
var
i: integer;
begin
m_iSetNumber := 0;
for i := High(arrClientBoardSizes) downto Low(arrClientBoardSizes) do
begin
if ((ClientSize.cx >= arrClientBoardSizes[i].cx) and
(ClientSize.cy >= arrClientBoardSizes[i].cy)) then
begin
Result := arrClientBoardSizes[i];
m_iSetNumber := i;
exit;
end;
end; { for i }
Result := Size(0, 0);
end;
procedure TBitmapRes.FCalculateClientBoardSizes(InitialSize: TSize);
var
i: integer;
strResName: string;
iOptimal: integer;
iAddX, iAddY: integer;
begin
// Load board sizes from resources
with TPngObject.Create do
try
for i := Low(arrClientBoardSizes) to High(arrClientBoardSizes) do
begin
strResName := 'BOARD' + IntToStr(i);
LoadFromResourceName(HInstance, strResName);
arrClientBoardSizes[i] := Size(Width, Height);
end;
finally
Free;
end;
// Find optimal board size from resources
iOptimal := 0;
for i := High(arrClientBoardSizes) downto Low(arrClientBoardSizes) do
begin
if ((InitialSize.cx > (arrClientBoardSizes[i].cx + CHB_X - CHB_RES_X)) and
(InitialSize.cy > (arrClientBoardSizes[i].cy + CHB_Y - CHB_RES_Y))) then
begin
iOptimal := i;
break;
end;
end;
Assert(iOptimal > 0);
// Calculate board sizes for client
iAddX := InitialSize.cx - arrClientBoardSizes[iOptimal].cx;
iAddY := InitialSize.cy - arrClientBoardSizes[iOptimal].cy;
for i := Low(arrClientBoardSizes) to High(arrClientBoardSizes) do
begin
inc(arrClientBoardSizes[i].cx, iAddX);
inc(arrClientBoardSizes[i].cy, iAddY);
end;
bClientBoardSizesCalculated := TRUE;
end;
end.
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