[xep-support] Scaling external-graphic with XEP 3.7.5

From: MJ Suhonos (msuhonos@uhnres.utoronto.ca)
Date: Fri Apr 30 2004 - 10:44:08 PDT

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    Hi all,

    I'm trying to include images in a PDF document being generated using
    XSL:FO and XEP 3.7.5. The difficulty I'm having is because I don't know
    the image format or size before doing the render, so it has to be done
    automatically in the XSL-FO pass. Images can be anywhere from 100x100px
    to 1000x1000px.

    XEP handles the format fine (for the most part), but scaling is
    unpredictable, even (or particularly) using width="auto" height="auto"
    content-width="auto" content-height="auto". What I am trying to do is
    scale down large images to fit within the width of my page, and keep
    small images their original size (or a reasonable size) - strangely I
    seem to be having more problems with small images scaling too large
    rather than vice-versa.

    This seems to be a case for using the scale-to-fit value
    (http://xep.xattic.com/xep/testsuite/usecases/image-scale.pdf), but my
    difficulty is that while I know the absolute width the area I want the
    image to appear (19cm), I know neither the height (since this should be
    dependent on the scaled image), and I'm having problems with the image
    overflowing outside of the block.

    The pertinent part of the FO for my example is:
    (full XSL-FO available, it's just very large)

    <fo:block space-after.optimum="6pt" space-before.optimum="6pt" span="all">
    <fo:table width="100%" table-layout="fixed">
    <fo:table-row keep-with-next="always">
    <fo:block id="figure1" span="all" font-size="8.5pt">
    <fo:inline font-weight="bold">Figure 1: </fo:inline>Simple EAV schema
    for a clinical database.</fo:block>
    <fo:table-row keep-with-previous="always">
    <fo:block text-align="center" span="all">
    content-width="auto" content-height="auto" width="auto" height="auto"/>
    <fo:table-row keep-with-previous="always">

    I have the image and caption in a blind table to keep them together
    across page-breaks (yes, I know this is ugly but it was the best way I
    could ensure consistent layout). Should I be using a block-container
    instead/as well?

    Full XML/PDF sources at:

    Any help is gratefully appreciated!


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