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tannewt 2012-10-27 22:08:19 -07:00
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AlsoFilter.md

@ -10,7 +10,7 @@ Mapnik evaluates all Rules in a Style sequentially from top to bottom, testing e
## Usage
An `<AlsoFilter />` is useful when you want to draw a bunch of similar things (like POI-Icons) and you would want to add another Symbolizer to each and every Rule in the style. Using a separate `<AlsoFilter />`-Rule avoids duplicating the other Symbolizer over and over.
Please note, that there are different methods of creating such combined styles, each having their own pros and cons. One possibility would be using [[ShieldSymbolizer]]s, which would keep the Icon and the Text together and would never lead to an icon without text or vice versa. In complex styles it's sometimes necessary to place the [[PointSymbolizer]]s into a different Style then the [[TextSymbolizer]]s in order to gain grater control about the drawing order.
Please note, that there are different methods of creating such combined styles, each having their own pros and cons. One possibility would be using [[ShieldSymbolizer]]s, which would keep the Icon and the Text together and would never lead to an icon without text or vice versa. In complex styles it's sometimes necessary to place the [[PointSymbolizer]]s into a different Style then the [[TextSymbolizer]]s in order to gain greater control about the drawing order.
## Behavior regarding filter-mode="first"
With #706 the new `filter-mode` attribute was introduced to the Style object. Setting `filter-mode="first"` in conjunction with an `<AlsoFilter />`-Rule will apply only the first matching Rule of the Style. If a Rule matched, all `<AlsoFilter />`-Rules are applied, too. If no Rule matched, all `<ElseFilter />`-Rules are evaluated.