Mike Bostock

That reminds me, there’s a related problem where the interpolated projection can get out of sync with its a & b projections if their center or translate changes after alpha...

Does that work in conjunction with rotation and tilt? That's a neat trick!

I think tilt angles of 25°-30° are actually not that uncommon, but you do have to crop and zoom in to avoid the high-distortion areas. The [U.S.-Mexico border graphic](http://www.nytimes.com/interactive/2013/03/01/world/americas/border-graphic.html) we...

Right… the distortion is out of view. There's actually no problem if you prefilter the geometry beforehand to the countries that are visible: http://bl.ocks.org/mbostock/2b977f1a962b0eb48f69 Of course, that doesn't help much...

FWIW, you could use ogr2ogr's -clipdst argument to clip the geometry to the viewport (assuming you figure out how to express the projection in [georeferenced coordinates](http://bl.ocks.org/mbostock/5050837)), which is probably the...

:boom:

Can you save me some trouble and link to demos (e.g., using http://bl.ocks.org) of the new features?

Is ellipse new? Doesn’t look like part of CanvasPathMethods: https://www.w3.org/TR/2dcontext/#canvaspathmethods

You can clip to an axis-aligned rectangle using d3.geoIdentity: https://bl.ocks.org/mbostock/5b2a1d47ae020b9533c24129ada97ff0 You can save the result using d3.geoProject or geoproject: https://bl.ocks.org/mbostock/ffbe45ba1dfc5ebd56b7f4cfdac9b71a Lastly, here is a trival port of Sutherland–Hodgman clipping from...

These look promising: * https://github.com/w8r/GreinerHormann * https://github.com/w8r/martinez