Add and remove edges from a gGraph object

The functions geo.add.edges and geo.remove.edges allow one to add or remove edges interactively with a gGraph object. When adding edges, two approaches are possible:
- click vertices defining new edges (mode="points")
- select an area in which all edges from a reference graph are added (mode="area").

Usage

geo.add.edges(x, mode = c("points", "area", "all"), refObj = "rawgraph.40k")

Arguments

x

a valid gGraph object.

mode

a character string indicating the mode for addition or removal of edges. 'points': user is expected to click vertices to indicate edges. 'area': user is expected to click two points defining a rectangular area within which all edges are selected. 'all': all edges from the reference graph are added to the current object.

refObj

a valid gGraph object, used as a reference when adding edges. When selecting an area inside which edges are added, all edges existing in this area in refObj are added to x. Alternatively, a character string can be provided, corresponding to one of the following datasets: 'rawgraph.10k', rawgraph.40k'.

Value

A gGraph object with newly added or removed edges.

See also

setEdges to non-interactively add or remove edges in a gGraph object.

Examples

if (FALSE) {
plot(worldgraph.10k, reset = TRUE)

## zooming in
geo.zoomin(list(x = c(-6, 38), y = c(35, 73)))
title("Europe")

## remove edges
geo.remove.edges(worldgraph.10k) # points mode
geo.remove.edges(worldgraph.10k, mode = "area") # area mode

## add edges
geo.add.edges(worldgraph.10k) # points mode
geo.add.edges(worldgraph.10k, mode = "area") # area mode
}