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Graph Layout Offline

Description

Compute the force layout (same as graph_layout_live ) but before rendering in the browser.

Usage

graph_offline_layout(
  g,
  steps = 500,
  spring_length = 30L,
  sping_coeff = 8e-04,
  gravity = -1.2,
  theta = 0.8,
  drag_coeff = 0.02,
  time_step = 20L,
  is_3d = TRUE,
  verlet_integration = FALSE,
  quiet = !interactive()
)
graph_layout_offline(
  g,
  steps = 500,
  spring_length = 30L,
  sping_coeff = 8e-04,
  gravity = -1.2,
  theta = 0.8,
  drag_coeff = 0.02,
  time_step = 20L,
  is_3d = TRUE,
  verlet_integration = FALSE,
  quiet = !interactive()
)

Arguments

Argument	Description
g	An object of class graph as returned by graph or a graph_proxy as returned by a function of the same name.
steps	Number of steps to run the layout algorithm.
spring_length	Used to compute Hook's law, default of 30 is generally ideal.
sping_coeff	Hook's law coefficient, where 1 is a solid spring.
gravity	Coulomb's law coefficient. It's used to repel nodes thus should be negative if positive nodes attract each other.
theta	Theta coefficient from Barnes Hut simulation, between 0 and 1 . The closer it's to 1 the more nodes the algorithm will have to go through. Setting it to one makes Barnes Hut simulation no different from brute-force forces calculation (each node is considered).
drag_coeff	Drag force coefficient. Used to slow down system, thus should be less than 1 . The closer it is to 0 the less tight system will be.
time_step	Default time step $dt$ for forces integration.
is_3d	Whether to plot in 3 dimensions or 2 dimensions.
verlet_integration	If you find that standard the default Euler integration produces too many errors and jitter, consider using verlet integration by settings this to TRUE .
quiet	Set to FALSE to print helpful messages and progress bar to track computation steps, defaults to interactive .

Details

This method is not necessarily faster than rendering in the browser as the graph has to be serialised to JSON once more to be processed by the https://github.com/anvaka/ngraph.forcelayout3d algorithm then reimported in grapher.

See Also

graph_layout_static for other "offline" layout methods.

Examples

gdata <- make_data(500)

gdata %>%
graph() %>%
graph_layout_offline(steps = 100)