Заполнение фона формы рисунком




Интуитивно понятный интерфейс - это такой интерфейс, для работы с которым нужна недюжинная интуиция.


unit bmpformu;
interface
uses
Windows, Messages, SysUtils, Classes, Graphics, Controls,
Forms, Dialogs, StdCtrls;
type
TBmpForm = class(TForm)
Button1: TButton;
procedure FormDestroy(Sender: TObject);
procedure FormPaint(Sender: TObject);
procedure Button1Click(Sender: TObject);
procedure FormCreate(Sender: TObject);
private
Bitmap: TBitmap;
procedure ScrambleBitmap;
procedure WMEraseBkgnd(var m: TWMEraseBkgnd); message WM_ERASEBKGND;
end;
var
BmpForm: TBmpForm;
implementation
{$R *.DFM}
procedure TBmpForm.FormCreate(Sender: TObject);
begin
Bitmap := TBitmap.Create;
Bitmap.LoadFromFile('bor6.bmp');
end;
procedure TBmpForm.FormDestroy(Sender: TObject);
begin
Bitmap.Free;
end;
// since we're going to be painting the whole form, handling this
// message will suppress the uneccessary repainting of the background
// which can result in flicker.
procedure TBmpform.WMEraseBkgnd(var m : TWMEraseBkgnd);
begin
m.Result := LRESULT(False);
end;
procedure TBmpForm.FormPaint(Sender: TObject);
var
x, y: Integer;
begin
y := 0;
while y < Height do
begin
x := 0;
while x < Width do
begin
Canvas.Draw(x, y, Bitmap);
x := x + Bitmap.Width;
end;
y := y + Bitmap.Height;
end;
end;
procedure TBmpForm.Button1Click(Sender: TObject);
begin
ScrambleBitmap; Invalidate;
end;
// scrambling the bitmap is easy when it's has 256 colors:
// we just need to change each of the color in the palette
// to some other value.
procedure TBmpForm.ScrambleBitmap;
var
pal: PLogPalette;
hpal: HPALETTE;
i: Integer;
begin
pal := nil;
try
GetMem(pal, sizeof(TLogPalette) + sizeof(TPaletteEntry) * 255);
pal.palVersion := $300;
pal.palNumEntries := 256;
for i := 0 to 255 do
begin
pal.palPalEntry[i].peRed := Random(255);
pal.palPalEntry[i].peGreen := Random(255);
pal.palPalEntry[i].peBlue := Random(255);
end;
hpal := CreatePalette(pal^);
if hpal <> 0 then
Bitmap.Palette := hpal;
finally
FreeMem(pal);
end;
end;
end.


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