Date: Tue Mar 31 2015 - 14:20:50 PST
Recently a few questions were asked about bookfolding. In the past we have
presented a solution that used the RenderX Intermediate Format and shows how
to bookfold a document before final output.
But what about a random PDF you have laying around? Well, with RenderX's new
extension (rx:pdf-page) which can be used on <fo:external-graphic/> to
select a specific page of a PDF to use as an image, we can create bookfolded
output from any PDF you have.
Bookfolding is typically creating a booklet for saddle stitching, outputting
the document by combining two pages into one in a specific order. When
printed, this document can be combined, folded and stitched into a booklet.
A good example is say you have a 10 page document, you would normally
combine as follows (duplexed) with all pages twice the width of the original
page:
10, 1 as page 1
2,9 as page 2
8,3 as page 3
4,7 as page 4
6, 5 as page 5
Sometimes you may not want to include the back or front pages as they are
used for the cover. In this case you would have:
1 as page 1 as same size
9, 2 as page 2 double the width
3, 8 as page 3 double the width
7, 4 as page 4 double the width
5,6 as page 4 double the width
10 as page 10 as same size
So, lets say we have a PDF in hand (even page count of course) and we want
to create a bookfolded document. We may create a simple XML file that
describes this job as follows:
<bookfold>
<document src="XEPUserGuide.pdf" cover="false"/>
<pagewidth>8.27in</pagewidth>
<pageheight>11in</pageheight>
<pages>206</pages>
</bookfold>
This simple XML tells us what document to use, whether we want a cover or
not and some information about that PDF. This information we need to feed
the formatter to make sure the document size and pagination is correct.
Using this simple XSL below, we can create a simple XSL FO that takes
advantage of this new extension by placing the PDF pages into a new two
column document using:
<fo:external-graphic rx:pdf-page="#" src="XEPUserGuide.pdf"/>
Give it a test. Send me any questions or enhancements.
We are working on a new update to Cloudformatter client which will include
both PDF merging, stamping and this bookfolding among many other sample
templates. And with Cloudformatter, you do not even need RenderX installed
locally, it will format on the web and return the document to you.
Kevin Brown
RenderX
PS: http://www.cloudformatter.com/Nimbus is our free to use XSL Designer.
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:fo="http://www.w3.org/1999/XSL/Format"
xmlns:rx="http://www.renderx.com/XSL/Extensions"
version="1.0">
<xsl:template match="/bookfold">
<fo:root>
<fo:layout-master-set>
<fo:simple-page-master page-width="{pagewidth}"
page-height="{pageheight}" master-name="front">
<fo:region-body/>
</fo:simple-page-master>
<fo:simple-page-master page-width="2 * {pagewidth}"
page-height="{pageheight}" master-name="all">
<fo:region-body column-count="2" column-gap="0in"/>
</fo:simple-page-master>
<fo:simple-page-master page-width="{pagewidth}"
page-height="{pageheight}" master-name="back">
<fo:region-body/>
</fo:simple-page-master>
</fo:layout-master-set>
<xsl:if test="document/@cover='true'">
<fo:page-sequence master-reference="front">
<fo:flow flow-name="xsl-region-body">
<fo:block line-height="0">
<fo:external-graphic src="{document/@src}"
rx:pdf-page="1"/>
</fo:block>
</fo:flow>
</fo:page-sequence>
</xsl:if>
<fo:page-sequence master-reference="all">
<fo:flow flow-name="xsl-region-body">
<xsl:call-template name="pages"/>
</fo:flow>
</fo:page-sequence>
<xsl:if test="document/@cover='true'">
<fo:page-sequence master-reference="back">
<fo:flow flow-name="xsl-region-body">
<fo:block line-height="0">
<fo:external-graphic src="{document/@src}"
rx:pdf-page="{number(pages)}"/>
</fo:block>
</fo:flow>
</fo:page-sequence>
</xsl:if>
</fo:root>
</xsl:template>
<xsl:template name="pages">
<xsl:choose>
<xsl:when test="document/@cover='true'">
<xsl:call-template name="page">
<xsl:with-param name="pgleft" select="number(pages) -
1"/>
<xsl:with-param name="pgright" select="2"/>
<xsl:with-param name="odd" select="true()"/>
</xsl:call-template>
</xsl:when>
<xsl:otherwise>
<xsl:call-template name="page">
<xsl:with-param name="pgleft" select="number(pages)"/>
<xsl:with-param name="pgright" select="1"/>
<xsl:with-param name="odd" select="true()"/>
</xsl:call-template>
</xsl:otherwise>
</xsl:choose>
</xsl:template>
<xsl:template name="page">
<xsl:param name="pgleft"/>
<xsl:param name="pgright"/>
<xsl:param name="odd"/>
<fo:block line-height="0">
<fo:external-graphic src="{document/@src}"
rx:pdf-page="{$pgleft}"/>
</fo:block>
<fo:block line-height="0">
<fo:external-graphic src="{document/@src}"
rx:pdf-page="{$pgright}"/>
</fo:block>
<xsl:if test="not(($pgleft - $pgright) = -1 or ($pgleft - $pgright)
= 1)">
<xsl:choose>
<xsl:when test="$odd">
<xsl:call-template name="page">
<xsl:with-param name="pgleft" select="$pgright + 1"/>
<xsl:with-param name="pgright" select="$pgleft - 1"/>
<xsl:with-param name="odd" select="false()"/>
</xsl:call-template>
</xsl:when>
<xsl:otherwise>
<xsl:call-template name="page">
<xsl:with-param name="pgleft" select="$pgright - 1"/>
<xsl:with-param name="pgright" select="$pgleft + 1"/>
<xsl:with-param name="odd" select="true()"/>
</xsl:call-template>
</xsl:otherwise>
</xsl:choose>
</xsl:if>
</xsl:template>
</xsl:stylesheet>
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