Plot Raven hydrologic process network using DiagrammeR

This routine takes a connections data from generated using rvn_rvi_connections() and returns the connections information as a DiagrammeR object.

rvn_rvi_process_diagrammer(
  rvi_conn,
  sv_omit = c("SNOW_DEPTH", "COLD_CONTENT", "PONDED_WATER/SNOW_LIQ", "NEW_SNOW",
    "SNOW_DEFICIT"),
  repel_force = 0.001,
  repel_iter = 2000,
  lbl_size = 0.5,
  lbl_height = 0.3,
  lbl_width = 1,
  pdfout = NULL
)

Arguments

rvi_conn

a list of connections and AliasTable, provided by rvn_rvi_connections

sv_omit

character vector of state variables to omit from the plot

repel_force

numeric value indicating the 'force' with which the repel function will move labels

repel_iter

the maximum number of iterations for the repel algorithm

lbl_size

estimated height of labels, used in repel algorithm

lbl_height

actual height of the labels (in inches)

lbl_width

relative width of the labels (multiplier)

pdfout

name of pdf file to save the network plot to, if null no PDF is generated

Value

d1 returns DiagrammeR object. Also generates a .pdf file in working directory if pdfplot argument is not NULL.

Details

Uses the output from the rvn_rvi_connections function to generate the plot with the DiagrammeR library.

Note that the output can be plotted using the render_graph function in the DiagrammeR library. The outputted DiagrammeR object may also have aesthetics modified with various commands from the same library, if desired, as shown in the examples. The rsvg and DiagrammeRsvg packages may be required to export to PDF with desired results, but are not explicit dependencies of RavenR.

sv_omit is used to reduce the clutter in the process plot of state variables that one may wish to omit from the plot.

The function uses the functionality from ggrepel to repel labels from one another. The degree of separation in the labels can be controlled by the repel_force and lbl_size parameters (increasing either will increase the separation between labels). The repel_force may range from approximately 1 to 1e-6. The lbl_size is a relative estimate of the label height (default 0.5), which is used in estimating the label size in the repel functionality. Providing a larger number will increase the perceived size of the label in the repel functionality and tend towards more separation between labels, and vice-versa. Both of these parameters may need to change depending on the plot size and number of labels. The lbl_height and lbl_width parameters can be changed to affect the height and relative width of the actual labels.

The basic model structure outline is followed, but unrecognized state variables are plotted on the left hand side of the plot (determined with internal RavenR function rvn_rvi_process_layout).

See also

rvn_rvi_connections to generate connections table from an rvi object

rvn_rvi_process_ggplot to generate the structure plot using ggplot.

See also the Raven page. Additional details on the DiagrammeR package may be found on the Github page.

Examples

d1 <- rvn_rvi_read(system.file("extdata","Nith.rvi", package="RavenR")) %>%
  rvn_rvi_connections() %>%
    rvn_rvi_process_diagrammer()

# plot diagram using the DiagrammeR package
library(DiagrammeR)

d1 %>%
  render_graph()


# modify default plot attributes, plot
d1 %>%
  select_nodes() %>%
  set_node_attrs_ws(node_attr = fillcolor, value = "hotpink") %>%
  select_edges() %>%
  set_edge_attrs_ws(edge_attr = style, value = "dashed") %>%
  set_edge_attrs_ws(edge_attr = penwidth, value = 2) %>%
  render_graph()