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Updated API changes between v2.0 and v2.1 (markdown)

herm 2012-07-28 16:40:47 -07:00
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API-changes-between-v2.0-and-v2.1.md

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## Added
* `Expression` - you can now use the built in keyword of `[mapnik::geometry_type]` to filter features by geometry type either by name or integer key. The mapping is `0:no geometry`, `1:point`, '2:linestring`, `3:polygon`, and `4:collection`. A collection indicates that the `Feature` has more than one geometry of different types. So a `Feature` with three linestrings will be reported as `linestring` but a `Feature` with a point and a linestring will be reported as a `collection`. - for more details see [#](https://github.com/mapnik/mapnik/issues/546)
* `Expression` - you can now use the built in keyword of `[mapnik::geometry_type]` to filter features by geometry type either by name or integer key. The mapping is `0:no geometry`, `1:point`, '2:linestring`, `3:polygon`, and `4:collection`. A collection indicates that the `Feature` has more than one geometry of different types. So a `Feature` with three linestrings will be reported as `linestring` but a `Feature` with a point and a linestring will be reported as a `collection`. - for more details see [#546](https://github.com/mapnik/mapnik/issues/546)
* To All symbolizers (in most cases)
* `comp-op` - All symbolizers now support compositing in the AGG and Cairo renderers
* `clip` - All(most) symbolizers - boolean of whether to clip geometries before rendering (defaults to `true`)
* `smooth` - bezier smooth value - 0-1, 0 (default) means no smoothing, 1 means fully smoothed, higher values create wild loopbacks
* `LineSymbolizer`
* `offset` - offset lines either in positive (right side) or negative (left side)
* [`TextSymbolizer`](https://github.com/mapnik/mapnik/wiki/TextSymbolizer)
* New placement alogrithm: `list`
* Text formatting
Changes documented in TextSymbolizer documentation
* Python Bindings:
* `mapnik.Image.get_pixel()` - get unsigned int value representing the rgba value, useful for fast pixel comparisons
* `mapnik.Grid.get_pixel()` - get int value representing the feature id encoded in the grid pixels
* `mapnik.Grid.get_pixel()` - get int value representing the feature id encoded in the grid pixels
* bindings for text placement and formatting work