Trim map data exceeding projection limits
[ymat,xmat,trimpts] = trimdata(ymat,ylim,xmat,xlim,object)
[ymat,xmat,trimpts] = trimdata(ymat,ylim,xmat,xlim,object)
identifies points in map data that exceed projection limits. The projection limits are
defined by the lower and upper inputs. The particular object to be trimmed is identified
by the object input.
Allowable objects are
'surface' for trimming graticules
'light' for trimming lights,
'line' for trimming lines
'patch' for trimming patches
'text' for trimming text object
location points
'none' to skip all trimming operations