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Updated Expression (markdown)

gisupc 2012-12-10 04:03:40 -08:00
parent f9aee2d682
commit ada26f8869
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Expression.md

@ -3,3 +3,7 @@ Mapnik Expressions enable data-driven behavior in Mapnik. They are constructed f
Recently, in Mapnik 2.1, expressions became enabled in the `transform` parser used to apply affine transformations to image and svg symbols. So, now you can not only, for example, rotate symbols with a transform like `transform="rotate(45)"` but the rotation can be data driven like `transform="rotate([field])"`
For more info on the original design see: http://mapnik.org/news/2009/12/08/future_mapnik2/
in the feature,I think the color attribute such as the stroke of
LineSymbolizer, the fill of PolygonSymbolizer, the fill of TextSymbolizer and so on, should also support Expression, this is more useful.