Eigenes Formlayout

[Progman]

Ein Form einem Bitmap anpassen:

Delphi-Quellcode:

//Declaration in TForm:
  private
    HG: TBitmap;
    FRegion: THandle;
    function CreateRegion(Bmp: TBitmap): THandle;
  end;

var
  frmMain: TfrmMain;

implementation

{$R *.dfm}

function TfrmMain.CreateRegion(Bmp: TBitmap): THandle;
var
  X, Y, StartX: Integer;
  Excl: THandle;
  Row: PRGBArray;
  TransparentColor: TRGBTriple;
begin
  Bmp.PixelFormat := pf24Bit;
  Result := CreateRectRGN(0, 0, Bmp.Width, Bmp.Height);
  for Y := 0 to Bmp.Height - 1 do
  begin
    Row := Bmp.Scanline[Y];
    StartX := -1;
    if Y = 0 then
      TransparentColor := Row[0];
    for X := 0 to Bmp.Width - 1 do
    begin
      if (Row[X].rgbtRed = TransparentColor.rgbtRed) and
        (Row[X].rgbtGreen = TransparentColor.rgbtGreen) and
        (Row[X].rgbtBlue = TransparentColor.rgbtBlue) then
      begin
        if StartX = -1 then StartX := X;
      end
      else
      begin
        if StartX > -1 then
        begin
          Excl := CreateRectRGN(StartX, Y, X + 1, Y + 1);
          try
            CombineRGN(Result, Result, Excl, RGN_DIFF);
            StartX := -1;
          finally
            DeleteObject(Excl);
          end;
        end;
      end;
    end;
    if StartX > -1 then
    begin
      Excl := CreateRectRGN(StartX, Y, Bmp.Width, Y + 1);
      try
        CombineRGN(Result, Result, Excl, RGN_DIFF);
      finally
        DeleteObject(Excl);
      end;
    end;
  end;
end;

procedure TfrmMain.FormCreate(Sender: TObject);
begin
  DoubleBuffered:=True;
  HG:=TBitmap.Create;
  HG.LoadFromFile('dein Pfad und dein Bild.bmp');
  //Breite und Höhe den Bildmaßen anpassen
  ClientWidth:=HG.Width;
  ClientHeight:=HG.Height;
  //erzeugen einer Region, als Transparentfarbe wird die Farbe des ersten Picels oben links verwendet
  FRegion := CreateRegion(HG);
  SetWindowRGN(Handle, FRegion, True);
  .....
end;

procedure TfrmMain.FormDestroy(Sender: TObject);
begin
  HG.Free;
end;

procedure TfrmMain.FormPaint(Sender: TObject);
begin
  BitBlt(Canvas.Handle,0,0,ClientWidth,ClientHeight,HG.Canvas.Handle,0,0,SRCCOPY);
end;
//so kann man ein Form einem Bitmap anpassen