openline.gle

Library to plot lines with an opening around the marker.

Author: Francois Tonneau

List of subroutines:

openline: draw a line with an opening around each data point.

The openline subroutine cannot handle missing data. Thus, if you want to plot

a dataset of 20 points with a missing value at position 8, call openline with

first = 1 and last = 7, then call openline again with first = 9 and last = 20.

Because openline employs xg() and yg(), it must be called outside of a graph

block, or within a graph block via the 'draw' directive ('draw openline').

sub openline dataset$ opening linecolor$ linewidth linestyle first last