order coordinates based on their angle around a central point
Usage
convexify(xside, yside, indx, indy, order = FALSE)
Arguments
- xside
vector of x coordinates
- yside
vector of y coordinates
- indx
central point x coordinate
- indy
central point y coordinate
- order
logical - if TRUE return order only and not the
coordinates
Value
a data frame of ordered x and y coordinates.
Details
For rasterisation, the shape of the polygon must be as
convex as possible. To ensure that all points are in some sense
in a convex form we order them based on their polar coordinate
angle.