Styler

We need a GUI to allow users to do Styling of different Layers:

• Polygon Feature layers
• Shapefile layers
• Theme layers

The Style is stored in the per-config link table with the layer, so that the same data can be styled differently for different users. It is a JSON structure:

• ​https://github.com/flavour/eden/blob/master/modules/s3db/gis.py#L2007

Basic

• Read current setting
• Predefined palette
• Updates Layer Setting
• Updates All Features in realtime
  • ​http://dev.openlayers.org/docs/files/OpenLayers/Style-js.html
  • addRules()
  • applySymbolizer()
• Initial applying of style to features not possible via feature.layer.style as not yet set
• Save of setting occurs with rest of Map save (also provide explicit option within widget or do automatically?)

Advanced

• ​http://gxp.opengeo.org/master/examples/histogram.html
• Add ability to select colours/opacity/etc:
  • ​http://gxp.opengeo.org/master/examples/symbolizer.html
  • + Colour wheel
• Add ability to select number of breaks
  • options: Linear, Log, which can be manually adjusted

We should be able to integrate ​ColorBrewer for colour ramps: Sequential vs Diverging

We should be able to break up the data in various ways, like QGIS can:

• ​http://multimedia.journalism.berkeley.edu/tutorials/qgis-basics-journalists/choropleth/