Fórum Como Imprimir o Canvas de um TImage ??? #181042

Caro [b:dc5c011e08]cebikyn[/b:dc5c011e08]

O segundo exemplo da primeira dica funcionou perfeitamente, por isto estou transcrevendo abaixo para que outros aproveitem quando estiverem pesquisando.


// from www.experts-exchange.com

uses
printers;

procedure DrawImage(Canvas: TCanvas; DestRect: TRect; ABitmap: TBitmap);
var
Header, Bits: Pointer;
HeaderSize: DWORD;
BitsSize: DWORD;
begin
GetDIBSizes(ABitmap.Handle, HeaderSize, BitsSize);
Header := AllocMem(HeaderSize);
Bits := AllocMem(BitsSize);
try
GetDIB(ABitmap.Handle, ABitmap.Palette, Header^, Bits^);
StretchDIBits(Canvas.Handle, DestRect.Left, DestRect.Top,
DestRect.Right, DestRect.Bottom,
0, 0, ABitmap.Width, ABitmap.Height, Bits, TBitmapInfo(Header^),
DIB_RGB_COLORS, SRCCOPY);
finally
FreeMem(Header, HeaderSize);
FreeMem(Bits, BitsSize);
end;
end;

procedure PrintImage(Image: TImage; ZoomPercent: Integer);
// if ZoomPercent=100, Image will be printed across the whole page
var
relHeight, relWidth: integer;
begin
Screen.Cursor := crHourglass;
Printer.BeginDoc;
with Image.Picture.Bitmap do
begin
if ((Width / Height) > (Printer.PageWidth / Printer.PageHeight)) then
begin
// Stretch Bitmap to width of PrinterPage
relWidth := Printer.PageWidth;
relHeight := MulDiv(Height, Printer.PageWidth, Width);
end
else
begin
// Stretch Bitmap to height of PrinterPage
relWidth := MulDiv(Width, Printer.PageHeight, Height);
relHeight := Printer.PageHeight;
end;
relWidth := Round(relWidth * ZoomPercent / 100);
relHeight := Round(relHeight * ZoomPercent / 100);
DrawImage(Printer.Canvas, Rect(0, 0, relWidth, relHeight), Image.Picture.Bitmap);
end;
Printer.EndDoc;
Screen.cursor := crDefault;
end;

// Example Call:

procedure TForm1.Button1Click(Sender: TObject);
begin
// Print image at 40¬ zoom:
PrintImage(Image1, 40);
end;

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