On Tue, July 12, 2011 2:40 pm, Trevor Nicholls wrote:
I am looking at a piece of XSL-FO which defines a block graphic for a PDF
document and which is probably overspecified.
The generated fo contains the following:
<fo:block text-align="center" display-align="center">
<fo:external-graphic vertical-align="middle" src="url({$src})"
height="{$h}" width="{$w}" content-height="scale-to-fit"
content-width="scale-to-fit" />
</fo:block>
When I look at the derivations of $h and $w it appears that they will
always
be either the actual dimensions of the graphic file, or values (scaled up
or
down) which preserve the original aspect ratio. Is there any point in
supplying both height and width together with content height and content
width?
See the definition of fo:external-graphic [3].
If you omit 'content-height' [1] or 'content-width' [2], then they have
their initial values of 'auto', which means the content should be shown at
its intrinsic height and width. So you'd end up with the external graphic
at its intrinsic size in a space some multiple of the intrinsic size, as
determined by 'height' and 'width'. When 'height' and 'width' are less
than the intrinsic size, you'd normally (depending on the 'overflow'
property value) see just some portion of the external graphic.
You could safely omit one of 'content-height' or 'content-width'. From [3]:
If one of the content-height or content-width is not "auto", the
same scale factor (as calculated from the specified non-auto value)
is applied equally to both directions.
You could also omit the corresponding 'height' or 'width' property since
the initial value of 'auto' would let the formatter set the dimension to
fit the scaled image.
Regards,
Tony Graham tgraham(_at_)mentea(_dot_)net
Consultant http://www.mentea.net
Mentea 13 Kelly's Bay Beach, Skerries, Co. Dublin, Ireland
-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
XML, XSL FO and XSLT consulting, training and programming
[1] http://www.w3.org/TR/xsl11/#content-height
[2] http://www.w3.org/TR/xsl11/#content-width
[3] http://www.w3.org/TR/xsl11/#fo_external-graphic
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