The factory class method heuristically decides which extension
to the Delaunay abstract class to use in order to construct the
fastest triangulation, and calls that extension, returning the
Generic class used to do the conversion between 4 different coordinate systems:
Garmin coordinates (derivative from WGS84)
User defined coordinate system (X/Y), defined by a converter class
Map coordinates (pixels), basically the user defined coordinate system
scaled to fit the desired zoom level and position to display.