polygon_dfobject from the given coordinates
polygon_df should not assume that the first and last point
within each id are the same. i.e. they may have to manulaly set a final
point equal to the initial point if that is what their graphics system
create_polygon_df(x, y, id = 1L)
coordinates of polygon. not necessarily closed.
a numeric vector used to separate locations in x,y into multiple polygons
data.frame with x, y, id columns.
df <- create_polygon_df(x = c(0, 0, 1, 1), y = c(0, 1, 1, 0)) is_polygon_df(df)
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