Q: Meaning of Origin

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   Hi,

I have a pdf document with some very interesting values for mediabox, artbox and trimbox:

/MediaBox [ -90 -216 702 1008 ]

/TrimBox [ -90 -216 702 1008 ]

/ArtBox [ 0.499 -193.6718 613.2822 970.6782 ]

My question is: what is the meaning of Origin in this case?

if I start with Origin = poLeftBottom (default) and switch Origin to poLeftTop this results in a mediabox of

[-90, 216, 702, 1440] 

as Top and Bottom are calculated as PageHeight - OriginalTop (OriginalBottom).  But this values doesn't make very much sense for me. 

This calculation only makes sense when mediabox starts with Left = 0 and Bottom = 0, so that the origin is always the according edgepoint of the mediabox.

But what to do in the above example. How should box coordinates be calculated when a origin switch occurs?

Thanks,

Uli

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ukobsa Members Profile Find Members Posts Senior Member Joined: 29 May 06 Location: Germany Status: Offline Points: 115	Post Options Post Reply Quote ukobsa Report Post Thanks(0) Quote Reply Topic: Q: Meaning of Origin Posted: 19 Sep 06 at 5:28AM
	Hi, I have a pdf document with some very interesting values for mediabox, artbox and trimbox: /MediaBox [ -90 -216 702 1008 ] /TrimBox [ -90 -216 702 1008 ] /ArtBox [ 0.499 -193.6718 613.2822 970.6782 ] My question is: what is the meaning of Origin in this case? if I start with Origin = poLeftBottom (default) and switch Origin to poLeftTop this results in a mediabox of [-90, 216, 702, 1440] as Top and Bottom are calculated as PageHeight - OriginalTop (OriginalBottom). But this values doesn't make very much sense for me. This calculation only makes sense when mediabox starts with Left = 0 and Bottom = 0, so that the origin is always the according edgepoint of the mediabox. But what to do in the above example. How should box coordinates be calculated when a origin switch occurs? Thanks, Uli