Hey all - I'm excited to share my implementation of OpenLayers support for UTFGrids. I wanted to get some feedback before doing a pull request.
Just a little background: UTFGrids are json "hit grids" used to provide a high degree of interactivity. For example, you can have mouseover events that display the attributes of the features *without* fetching additional data from the server. The best demo of the concept is probably http://mapbox.com/demo/visiblemap/. This functionality exists in the wax library and is largely deployed with ModestMaps. I've ported it to native OpenLayers code to better integrate with OL event handlers and such. There are three additional components: a UTFGrid Layer, Control and Tile. It has both ajax and jsonp loading protocols, tries to keep a clear separation between the grid layers, the grid controls and callbacks which allows things like multiple handlers and multiple hit grids per map. Some example code: var world_utfgrid = new OpenLayers.Layer.UTFGrid( 'UTFGrid Layer', "http://tiles.example.com/world_utfgrid/${z}/${x}/${y}.json"; ); map.addLayer(world_utfgrid); var control = new OpenLayers.Control.UTFGrid({ 'div': 'attrsdiv', 'layers': [world_utfgrid], 'handlerMode': 'move' }) map.addControl(control); Some demos: http://labs.ecotrust.org/utfgrid/events.html http://labs.ecotrust.org/utfgrid/multi.html and source: https://github.com/perrygeo/openlayers/tree/utfgrid Any thoughts on getting this into 2.12? This is my first substantial effort in extending OpenLayers so if you have any critiques or concerns that need to be addressed before a pull request would be considered, let me know. -- ·´¯`·.¸. , . .·´¯`·.. ><((((º>`·.¸¸.·´¯`·.¸.·´¯`·...¸><((((º> "The best way to predict the future is to invent it." -- Alan Kay Matthew T. Perry http://www.perrygeo.net http://viedevelo.wordpress.com _______________________________________________ Dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/openlayers-dev
