Scaling

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   Hi guys,

I am trying to display existing pdf file onto canvas.
Wen I display pdf at 72 dpi, everyting is ok, because when I retrieve 
page height and width using DAGetPageHeight, DAGetPageWidth
I set cavas size accordingly. The problem comes in when I try to zoom,
and by zoom, I mean rendering pdf file onto a canvas with dpi higher then 72.

How would I now size of a page in pixels (eight and width) when I display a page in resolution
that is not 72 dpi?

Thnx in advance.

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artjaggy Members Profile Find Members Posts Beginner Joined: 01 Jun 09 Status: Offline Points: 3	Post Options Post Reply Quote artjaggy Report Post Thanks(0) Quote Reply Topic: Scaling Posted: 08 Jun 09 at 4:24AM
	Hi guys, I am trying to display existing pdf file onto canvas. Wen I display pdf at 72 dpi, everyting is ok, because when I retrieve page height and width using DAGetPageHeight, DAGetPageWidth I set cavas size accordingly. The problem comes in when I try to zoom, and by zoom, I mean rendering pdf file onto a canvas with dpi higher then 72. How would I now size of a page in pixels (eight and width) when I display a page in resolution that is not 72 dpi? Thnx in advance.

Ingo Members Profile Find Members Posts Moderator Group Joined: 29 Oct 05 Status: Offline Points: 3530	Post Options Post Reply Quote Ingo Report Post Thanks(0) Quote Reply Posted: 08 Jun 09 at 6:35AM
	Hi! I don't use height and width while rendering ... What you can do is to render to file - then you have an image file and then you can use ImageHeight and ImageWidth. Mostly i'm using code like this: QP.RenderDocumentToFile(150,1,1,1,'c:\temp\' + ExtractFileName(Edit1.Text) + '.jpg',1,0); QP.RenderPageToStream(150,1,1,test_stream,1,0); You can put these render results on a resizable image component which is embedded in a nonresizable box with scrollbars. Cheers, Ingo