If a point pattern on a network is plotted in the graphics window, this function will find the point of the pattern which is nearest to the mouse position, and print its mark value (or its serial number if there is no mark).
A point pattern
on a linear network
(object of class
Arguments passed to
This is a method for the generic function
for point patterns on a linear network (objects of class
The point pattern
x should first be plotted
reads the position of the graphics pointer each time the
left mouse button is pressed. It then finds
the point of the pattern
x closest to the mouse position.
If this closest point is sufficiently close to the mouse pointer,
its index (and its mark if any)
will be returned as part of the value of the call.
Each time a point of the pattern is identified,
text will be displayed next to the point,
showing its serial number (if
x is unmarked)
or its mark value (if
x is marked).
x is unmarked, the result is
a vector containing the serial numbers of the points in the pattern
x that were identified.
x is marked, the result is a
2-column matrix, the first column containing the serial numbers
and the second containing the marks for these points.
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