R igraph manual pages

Optimal edge curvature when plotting graphs

Description

If graphs have multiple edges, then drawing them as straight lines does not show them when plotting the graphs; they will be on top of each other. One solution is to bend the edges, with diffenent curvature, so that all of them are visible.

Usage

curve_multiple(graph, start = 0.5)

Arguments

graph	The input graph.
start	The curvature at the two extreme edges. All edges will have a curvature between -start and start, spaced equally.

Details

curve_multiple calculates the optimal edge.curved vector for plotting a graph with multiple edges, so that all edges are visible.

Value

A numeric vector, its length is the number of edges in the graph.

Author(s)

Gabor Csardi csardi.gabor@gmail.com

See Also

igraph.plotting for all plotting parameters, plot.igraph, tkplot and rglplot for plotting functions.

Examples

g <- graph( c(0,1,1,0,1,2,1,3,1,3,1,3,
              2,3,2,3,2,3,2,3,0,1)+1 )

curve_multiple(g)

## Not run: 
set.seed(42)
plot(g)

## End(Not run)

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