placement-type and placements for ShieldSymbolizer about mapnik-reference HOT 7 CLOSED

It is supported, however the function behaves exactly the same as for TextSymbolizers. It modifies dx and dy values but not shield-dx/dy. It also influences {horizontal,vertical}-alignment when set to "auto" which moves marker a bit. Modifying shield-dx/dy is not possible atm.

This is a useful example:
<ShieldSymbolizer face-name="DejaVu Sans Book" size="16" placement="point" dx="5" dy="16" file="../../data/svg/crosshair16x16.svg" horizontal-alignment="middle" vertical-alignment="middle" placement-type="simple" placements="N,S">[name]</ShieldSymbolizer>

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@herm - so the text will then be moved and not the underlying image - or am I misunderstanding?

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Correct.
However I don't fully understand ShieldSymbolizer behavior. I'm trying to produce a test case where unlock-image="true" produces a different output from unlock-image="false", but I was not successful yet. Also it looks like both code paths are always producing the same results.

I think we should start by writing documentation for ShieldSymbolizer and make sure code behaves as described in the documentation.

from mapnik-reference.

Okay, thank you. I will hold off on exposing in mapnik-reference until later on then.

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Documentation is now available on the wiki: https://github.com/mapnik/mapnik/wiki/ShieldSymbolizer

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TODO: get this branch merged: https://github.com/mapnik/mapnik-reference/commits/shield-placements.

Downstream issue http://support.mapbox.com/discussions/tilemill/6154-placements-placement-type-and-transform-attributes-of-a-shield-symbolizer

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landed in ec739c8

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