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...print a TImage?
Autor: Dirk Bögelspacher
Homepage: http://www.boegi.de
[ Print tip ]  

Tip Rating (94):  
     


{1.}

uses
  
Printers;

procedure TForm1.Button1Click(Sender: TObject);
var
  
ScaleX, ScaleY: Integer;
  RR: TRect;
begin
  with 
Printer do
  begin
    
BeginDoc;
    // Mit BeginDoc wird ein Druckauftrag initiiert.
    // The StartDoc function starts a print job.
    
try
      
ScaleX := GetDeviceCaps(Handle, logPixelsX) div PixelsPerInch;
      ScaleY := GetDeviceCaps(Handle, logPixelsY) div PixelsPerInch;
      // Informationen über die Auflösung
      // Retrieves information about the Pixels per Inch of the Printer.
      
RR := Rect(0, 0, Image1.picture.Width * scaleX, Image1.Picture.Height * ScaleY);
      Canvas.StretchDraw(RR, Image1.Picture.Graphic);
      // An die Auflösung anpassen
      // Stretch to fit

    
finally
      
EndDoc;   //Methode EndDoc beendet den aktuellen Druckauftrag und schließt die
      // Textdatei-Variable.
      // Steht in finally - um auch bei Abbruch des Druckauftrages Papierausgabe
      // sicherzustellen
    
end;
  end;
end;


{2.}
{************************************************************************}

// Based on posting to borland.public.delphi.winapi by Rodney E Geraghty, 8/8/97.


procedure PrintBitmap(Canvas: TCanvas; DestRect: TRect; Bitmap: TBitmap);
var
  
BitmapHeader: pBitmapInfo;
  BitmapImage: Pointer;
  HeaderSize: DWORD;
  ImageSize: DWORD;
begin
  
GetDIBSizes(Bitmap.Handle, HeaderSize, ImageSize);
  GetMem(BitmapHeader, HeaderSize);
  GetMem(BitmapImage, ImageSize);
  try
    
GetDIB(Bitmap.Handle, Bitmap.Palette, BitmapHeader^, BitmapImage^);
    StretchDIBits(Canvas.Handle,
      DestRect.Left, DestRect.Top,    // Destination Origin
      
DestRect.Right - DestRect.Left, // Destination Width
      
DestRect.Bottom - DestRect.Top, // Destination Height
      
0, 0,                           // Source Origin
      
Bitmap.Width, Bitmap.Height,    // Source Width & Height
      
BitmapImage,
      TBitmapInfo(BitmapHeader^),
      DIB_RGB_COLORS,
      SRCCOPY)
  finally
    
FreeMem(BitmapHeader);
    FreeMem(BitmapImage)
  end
end 
{PrintBitmap};


{3.}
{************************************************************************}
// 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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