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It is possible to rotate certain or all pages by increments of 90 degrees or to the angle 0,90,180 and 270.

 

This can be done with command COMPDF_RotatePage

 

it expects 2 parameters:

a) a string parameter

- a page number in the range 1...pagecount, i.e. "1"

- a page number list

- "selected" to modify the selected pages

- "all" to modify all pages

 

b) the rotation angle

 either +- 90, +-180 or

 1, 2, 3 or 4 * 90

 

Example:

for i:=1 to 10 do

WPViewPDF1.CommandStrEx(COMPDF_RotatePage, IntToStr(i),  90);

 

does the same as

WPViewPDF1.CommandStrEx(COMPDF_RotatePage, '1-10',  90);

 

 

Hint:

You can rotate the selected pages using

  WPViewPDF1.CommandStrEx(COMPDF_RotatePage, 'selected',  90);

 

To disable/enable this action use the event OnViewerMessage:

 

procedure TWPViewPDFDemo.DoViewerMessage(

 Sender: TObject;

 var ID : Integer;

 Param: Integer);

begin

 case ID of

...

   MSGPDF_CHANGESELPAGE:

   begin

     RotateAction.Enabled := Param>0;

   end;

 end;

end;