Generates a grid of points and then clips them to lie within a given boundary.
USAGE:
poly.grid(boundary, nx, ny, size)
REQUIRED ARGUMENTS:
boundary
a list with components named
"x" and
"y"
or a matrix with 2 columns representing
the vertices of a convex polygon. Endpoint need not be repeated.
nx
integer representing the number of cells in the horizontal direction.
ny
integer representing the number of cells in the vertical direction.
OPTIONAL ARGUMENTS:
size
numeric vector containing the size of each cell. If it has length one then
the cells will be squared with the same side sizes. If it has length two
then the cells will have width
size[1] and height
size[2].
VALUE:
a two-column matrix containing the coordinates of the resulting grid.
DETAILS:
A rectangular
nx by
ny grid is overlaid on the polygon defined by
boundary
and then those points that fall outside are dropped.
If
size is given then the values
nx and
ny are redundant
and if given will be ignored.