I've been trying to find a good reference for mapnik but most doco assumes you
know all about it and they're more or less a reference, but that doesn't help.
I'm trying to replace the highway shields for various roads, however I'm doing
a one size fits all approach and just altering the fontsize, which works, but
the text isn't centring and another highway shield I need to push the text more
toward the top rather than being centred vertically.
<Rule>
<Filter>([highway] = 'motorway' or [highway] = 'trunk' or [highway] =
'primary' or [highway] = 'secondary' or [highway] = 'tertiary' or [highway] =
'residential' or [highway] = 'unclassified') and [ref2] = 'MR' and [length] =
5</Filter>
<MaxScaleDenominator>2500000</MaxScaleDenominator>
<MinScaleDenominator>100</MinScaleDenominator>
<ShieldSymbolizer name="name2" face_name="DejaVu Sans Bold" size="10"
fill="#164b97" placement="line" file=
"/var/lib/mod_tile/symbols/shield_metro.png" type="png" width="24" height="28"
min_distance="0" spacing="0"/>
</Rule>
I altered the Query to dump the first 2 chars of ref into ref2, and name2
stores the ref without the first 2 chars, which all works, it's just not lining
up with the replacement image properly.
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