We illustrate edge animation with a simpler example to make it easy to see the effect. Our example begins as a trivially simple graph of only five vertices and no edges between them.
The animation proceeds by adding edges one by one. Similarly to vertex animation examples where lists of layouts define the animation sequence, edge animation requires a list of igraph objects with different edges.
g <- make_ring(5) - edges(1:5) # five vertices, no edges
graph_list <- list(
g + edge(1, 2),
g + edge(1, 2) + edge(2, 3),
g + edge(1, 2) + edge(2, 3) + edge(3, 4),
g + edge(1, 2) + edge(2, 3) + edge(3, 4) + edge(4, 5),
g + edge(1, 2) + edge(2, 3) + edge(3, 4) + edge(4, 5) + edge(5, 1))
graphjs(graph_list, main=paste(1:5),
vertex.color=rainbow(5), vertex.shape="sphere", edge.width=3)You can of course supply a list of layouts too, to control animation of both edges and vertex positions. Since no layouts were specified, a default vertex layout was generated for each scene in the above example.