A new #algorithm for finding a visual center of a #polygon
▻https://www.mapbox.com/blog/polygon-center
▻https://github.com/mapbox/polylabel
http://c1.staticflickr.com/9/8801/28714168970_e93fe37013.jpg 
https://c1.staticflickr.com/9/8824/29000043555_6487a7ab36_h.jpg The best place to put a text label or a tooltip on a polygon is usually located somewhere in its “visual center,” a point inside a polygon with as much space as possible around it.
The first thing that comes to mind for calculating such a center is the polygon centroid. You can calculate polygon centroids with a simple and fast formula, but if the shape is concave or has a hole, the point can fall outside of the shape.
The result is Polylabel, a fast and precise #JavaScript module for finding good points to place a label on a polygon. It is up to 40 times faster than the algorithm we started with, while also guaranteeing the correct result in all cases.
It’s now being ported to C++ and incorporated into both Mapbox GL JS and Native. The module is just 100 lines of code, so check it out!
#map
