dc-js/dc.js — pull request #719 by mtraynham (2014-10-02 04:27:45+00:00)
Title: GeoChoropleth refactor

Kind of a large refactor, which adds:
- Auto zoom to geo features with the current projection
- Graticule
- Sphere
- Title accessor for features
- Simplifies render and redraw functions

TODO:
- Fix tests (changes to SVG class names don't match)
- Add moar tests!
- Document

Future:
- [Projection change transitions](http://bl.ocks.org/mbostock/3711652):
```
var _projectionTween = function (projectionA, projectionB, width, height) {
return function (d) {
var t = 0,
projection = d3.geo.projection(function (λ, φ) {
λ *= 180 / Math.PI;
φ *= 180 / Math.PI;
var p0 = projectionA([λ, φ]),
p1 = projectionB([λ, φ]);
return [(1 - t) * p0[0] + t * p1[0], (1 - t) * -p0[1] + t * -p1[1]];
}).scale(1).translate([width / 2, height / 2]),
path = d3.geo.path().projection(projection);

return function (_) {
t = _;
return path(d);
};
};
},
```
- [d3.geo.zoom (Jason Davies license?)](http://www.jasondavies.com/maps/rotate/)