Graph layouts
This is a generic function to apply a layout function to a graph.
layout_(graph, layout, ...) ## S3 method for class 'igraph_layout_spec' print(x, ...) ## S3 method for class 'igraph_layout_modifier' print(x, ...)
graph |
The input graph. |
layout |
The layout specification. It must be a call to a layout specification function. |
... |
Further modifiers, see a complete list below.
For the |
x |
The layout specification |
There are two ways to calculate graph layouts in igraph.
The first way is to call a layout function (they all have
prefix layout_ on a graph, to get the vertex coordinates.
The second way (new in igraph 0.8.0), has two steps, and it
is more flexible. First you call a layout specification
function (the one without the layout_ prefix, and
then layout_ (or add_layout_) to
perform the layouting.
The second way is preferred, as it is more flexible. It allows
operations before and after the layouting. E.g. using the
component_wise argument, the layout can be calculated
separately for each component, and then merged to get the
final results.
The return value of the layout function, usually a two column matrix. For 3D layouts a three column matrix.
Modifiers modify how a layout calculation is performed. Currently implemented modifiers:
component_wise calculates the layout separately
for each component of the graph, and then merges
them.
normalize scales the layout to a square.
add_layout_ to add the layout to the
graph as an attribute.
Other graph layouts:
add_layout_(),
component_wise(),
layout_as_bipartite(),
layout_as_star(),
layout_as_tree(),
layout_in_circle(),
layout_nicely(),
layout_on_grid(),
layout_on_sphere(),
layout_randomly(),
layout_with_dh(),
layout_with_fr(),
layout_with_gem(),
layout_with_graphopt(),
layout_with_kk(),
layout_with_lgl(),
layout_with_mds(),
layout_with_sugiyama(),
merge_coords(),
norm_coords(),
normalize()
g <- make_ring(10) + make_full_graph(5) coords <- layout_(g, as_star()) plot(g, layout = coords)
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