Colors: Delphi Version

{*****************************************************************************
*                                                                            *
*  Colors.dpr                                                                *
*  ColorsU.pas                                                               *
*                                                                            *
*  This program illustrates how to establish the current color for 256-color *
*  and direct color virtual buffers. It obtains the display driver's color   *
*  depth, creates a 640x480 virtual buffer with the same color depth, and    *
*  fills it with blue pixels.                                                *
*                                                                            *
*****************************************************************************}
unit ColorsU;
interface
uses
  SysUtils, WinTypes, WinProcs, Messages, Classes, Graphics, Controls,
  Forms, Dialogs, FGWin;
type
  TForm1 = class(TForm)
    procedure AppOnActivate(Sender: TObject);
    procedure FormActivate(Sender: TObject);
    procedure FormCreate(Sender: TObject);
    procedure FormPaint(Sender: TObject);
    procedure FormResize(Sender: TObject);
    procedure FormDestroy(Sender: TObject);
  end;
var
  Form1: TForm1;
implementation
{$J+}
{$R *.DFM}
var
  dc   : hDC;
  hPal : hPalette;
  hVB  : integer;
  cxClient, cyClient : integer;
procedure TForm1.AppOnActivate(Sender: TObject);
begin
  fg_realize(hPal);
  Invalidate;
end;
procedure TForm1.FormActivate(Sender: TObject);
begin
  fg_realize(hPal);
end;
procedure TForm1.FormCreate(Sender: TObject);
var
  bpp : integer;
begin
  dc := GetDC(Form1.Handle);
  fg_setdc(dc);
  hPal := fg_defpal;
  fg_realize(hPal);
  fg_vbinit;
  bpp := fg_colors;
  fg_vbdepth(bpp);
  hVB := fg_vballoc(640,480);
  fg_vbopen(hVB);
  fg_vbcolors;
  if bpp > 8 then
     fg_setcolorrgb(85,85,25)
  else
     fg_setcolor(19);
  fg_fillpage;
  Application.OnActivate := AppOnActivate;
end;
procedure TForm1.FormPaint(Sender: TObject);
begin
  fg_vbscale(0,fg_getmaxx,0,fg_getmaxy,0,cxClient-1,0,cyClient-1);
end;
procedure TForm1.FormResize(Sender: TObject);
begin
  cxClient := ClientWidth;
  cyClient := ClientHeight;
  Invalidate;
end;
procedure TForm1.FormDestroy(Sender: TObject);
begin
  fg_vbclose;
  fg_vbfree(hVB);
  fg_vbfin;
  DeleteObject(hPal);
  ReleaseDC(Form1.Handle,dc);
end;
end.