Given a point pattern representing a set of vertices, this command gives a point-and-click interface allowing the user to join pairs of selected vertices by edges.
clickjoin(X, …, add = TRUE, m = NULL, join = TRUE)Point pattern of vertices. An object of class "ppp".
Arguments passed to segments to control
the plotting of the new edges.
Logical. Whether the point pattern X should be added to the
existing plot (add=TRUE) or a new plot should be created
(add=FALSE).
Optional. Logical matrix specifying an initial
set of edges. There is an edge between vertices i and
j if m[i,j] = TRUE.
Optional. If TRUE, then each user click will join a pair of
vertices. If FALSE, then each user click will delete an
existing edge. This is only relevant if m is supplied.
Logical matrix m with value m[i,j] = TRUE for every
pair of vertices X[i] and X[j] that should be joined by
an edge.
This function makes it easier for the user to create a linear network or a planar graph, given a set of vertices.
The function first displays the point pattern X,
then repeatedly prompts the user to click on a pair of points in X.
Each selected pair of points will be joined
by an edge. The function returns a
logical matrix which has entries equal to TRUE for each
pair of vertices joined by an edge.
The selection of points is performed
using identify.ppp which typically expects the user to
click the left mouse button. This point-and-click interaction
continues until the user terminates it,
by pressing the middle mouse button,
or pressing the right mouse button and selecting stop.
The return value can be used in linnet
to create a linear network.