Re: [docbook-apps] Always proportionally scale imagedata to page.

["Bob Stayton" <bobs@sagehill.net>]

Hi David,
I think I understand what you want, but I need one clarification.  This 
combination:

> scalefit="1"
> width="100%"
> contentdepth="100%"

does not have the effect that you want.  With contentdepth="100%", the image 
will be its intrinsic height. The other two attributes kick in only if the 
intrinsic width is too big to fit the available width, in which case the 
image will be proportionally scaled down to fit the 100% viewport width. 
That doesn't match your desire to maximize the size.

I think you intended:

scalefit="1"
width="100%"
depth="100%"

This sets the viewport to the maximum available size, and scales up the 
image until it bumps into one of the edges of the viewport.

But I'm not clear what you mean by the "largest size on the page". Does that 
mean for an image which is taller than it is wide, that it should scale to 
fit the remaining vertical space on the page (which might be quite small)? 
Or perhaps the largest size on a new page (which may require a forced page 
break to get the largest vertical space available)?

Regarding the customization process, you pretty much have to customize the 
process.image template.  This requires understanding the sequence of how the 
DocBook scaling attributes are massaged into the FO scaling attributes. Some 
attributes take precedence over others, so they interact a bit and it gets a 
little complicated.

Being able to specify default values for some of the attributes would be a 
nice feature request.

If you can add a preprocessing XSLT step, you could process with an identity 
stylesheet that just adds the attributes you want to imagedata (with logic 
to add them only if no overrides present).  Then you don't have to mess with 
process.image.

Bob Stayton
Sagehill Enterprises
bobs@sagehill.net


----- Original Message ----- 
From: "David E Nedrow" <nedlist@grandviewtheatre.net>
To: <docbook-apps@lists.oasis-open.org>
Sent: Wednesday, March 25, 2009 8:16 AM
Subject: [docbook-apps] Always proportionally scale imagedata to page.


>I would always like to have any images scaled proportionally to their 
>largest size on the page, and be able to override this for individual 
>images. Sort of the reverse of what happens by default.
>
> Would I handle this in a customization of <imagedata/> or 
> <process.image/>?
>
> I've tried variants of both with bad results (read: I did something  wrong 
> and it didn't work at all).
>
> Basically, I want the following attributes defined for all imagedata 
> items...
>
> scalefit="1"
> width="100%"
> contentdepth="100%"
>
> I know this is probably easy, but it's been several years since I  worked 
> directly with the stylesheets and the cobwebs are thick.
>
> Any help would be greatly appreciated.
>
> -David
>
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