Render Only Portion of Page

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   Hi,

Is it possible to render only a portion of a page to a DC, or do you always have to render the entire page to a temporary bitmap and then extract the portion you need afterward?

Thanks,

Tom

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tmills108 Members Profile Find Members Posts Beginner Joined: 16 May 13 Location: United States Status: Offline Points: 1	Post Options Post Reply Quote tmills108 Report Post Thanks(0) Quote Reply Topic: Render Only Portion of Page Posted: 16 May 13 at 2:40PM
	Hi, Is it possible to render only a portion of a page to a DC, or do you always have to render the entire page to a temporary bitmap and then extract the portion you need afterward? Thanks, Tom

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: 16 May 13 at 4:30PM
	Hi Tom! As far as i know that's the way... Cheers and welcome here, Ingo

tfrost Members Profile Find Members Posts Senior Member Joined: 06 Sep 10 Location: UK Status: Offline Points: 437	Post Options Post Reply Quote tfrost Report Post Thanks(0) Quote Reply Posted: 18 May 13 at 11:30AM
	Yes, you should be able to simply set the media box with SetPageBox. I have only done this myself with SaveToFile, to make eight separate A4 PDFs from a huge original drawing, but I assume it also works with rendering. Worth a quick experiment, anyway!

Rowan Members Profile Find Members Posts Moderator Group Joined: 10 Jan 09 Status: Offline Points: 398	Post Options Post Reply Quote Rowan Report Post Thanks(0) Quote Reply Posted: 16 Nov 15 at 3:41AM
	Hi Guys, We have added a new function in version 12 called SetRenderArea which will let you render only a portion of the page. The difference between using the CropBox to do this and the SetRenderArea page is that while specifying a CropBox smaller than the actual page size will output the cropped page, the entire page behind the scenes is processed. The SetRenderArea will be faster because it will only process the area of the page that is specified. http://www.debenu.com/docs/pdf_library_reference/SetRenderArea.php Cheers, - Rowan. Edited by Rowan - 16 Nov 15 at 3:42AM

mLipok Members Profile Find Members Posts Senior Member Joined: 23 Apr 14 Location: Poland, Zabrze Status: Offline Points: 453	Post Options Post Reply Quote mLipok Report Post Thanks(0) Quote Reply Posted: 16 Nov 15 at 8:23AM
	Hi Rowan. Is it mean I can now really crop page, as I was asking here: http://www.quickpdf.org/forum/setpagebox-capturepageex-drawcapturedpage_topic3048.html
	Here you can find description how to test my examples: http://www.quickpdf.org/forum/forum_posts.asp?TID=2932&PID=12600&title=drawcapturedpagematrix-matrix-howto#12600

Rowan Members Profile Find Members Posts Moderator Group Joined: 10 Jan 09 Status: Offline Points: 398	Post Options Post Reply Quote Rowan Report Post Thanks(0) Quote Reply Posted: 24 Nov 15 at 3:35AM
	Hi mLipok, SetRenderArea is only going to work when you are rendering the page to an image format using a function such as RenderPageToFile. So it can crop a page when you are rendering to an image, but it won't let you crop an existing PDF and then save it as an update to the PDF. It's only for rendering, not for modifying existing documents. Cheers, - Rowan.

mLipok Members Profile Find Members Posts Senior Member Joined: 23 Apr 14 Location: Poland, Zabrze Status: Offline Points: 453	Post Options Post Reply Quote mLipok Report Post Thanks(0) Quote Reply Posted: 24 Nov 15 at 6:19AM
	Thanks for clarification.
	Here you can find description how to test my examples: http://www.quickpdf.org/forum/forum_posts.asp?TID=2932&PID=12600&title=drawcapturedpagematrix-matrix-howto#12600

MiodragM Members Profile Find Members Posts Beginner Joined: 15 Dec 15 Location: Serbia Status: Offline Points: 1	Post Options Post Reply Quote MiodragM Report Post Thanks(0) Quote Reply Posted: 25 Dec 15 at 9:32AM
	Hi Guys, I'm currently evaluating quick pdf dll and met some potetionally problem. So, i need to determine empty area (box) on each page at the exact position. For that purpose I use RenderPageToString method and then examin area pixels. The problem is that method RenderPageToString is too slow - for example, the page (A4) has some content on it and method execution for the area 100x30 going to 500 ms. The pseudo code: ... sWatch = new System.Diagnostics.Stopwatch(); QP.SetRenderArea(BoxLeftH, BoxTopH, BoxWidth, BoxHeight); //BoxWidth is about 190, BoxHeight is about 30 sWatch.Start(); byte[] K = QP.RenderPageToString(72, selectedPage, 0); sWatch.Stop(); MS = new MemoryStream(K,false); ... - sWatch.ElapsedMilliseconds is in range 40-500ms!, depending on the page. Do I something wrong? Do you have some suggestion? Thanks, Miodrag