DiagrammeR (version 1.0.9)

set_node_position: Apply a layout position to a single node

Description

Apply position information for a single node. This is done by setting the x and y attrs for a node id or node label supplied in node. When rendering the graph, nodes with attribute values set for x and y will be fixed to those positions on the graph canvas.

Usage

set_node_position(graph, node, x, y, use_labels = FALSE)

Value

A graph object of class dgr_graph.

Arguments

graph

A graph object of class dgr_graph.

node

A single-length vector containing either a node ID value (integer) or a node label (character) for which position information should be applied.

x

The x coordinate to set for the node.

y

The y coordinate to set for the node.

use_labels

An option to use a node label value in node. Note that this is only possible if all nodes have distinct label values set and none exist as an NA value.

See Also

Other Node creation and removal: add_n_node_clones(), add_n_nodes_ws(), add_n_nodes(), add_node_clones_ws(), add_node_df(), add_nodes_from_df_cols(), add_nodes_from_table(), add_node(), colorize_node_attrs(), copy_node_attrs(), create_node_df(), delete_nodes_ws(), delete_node(), drop_node_attrs(), join_node_attrs(), layout_nodes_w_string(), mutate_node_attrs_ws(), mutate_node_attrs(), node_data(), recode_node_attrs(), rename_node_attrs(), rescale_node_attrs(), set_node_attr_to_display(), set_node_attr_w_fcn(), set_node_attrs_ws(), set_node_attrs()

Examples

# Create a simple graph with 4 nodes
graph <-
  create_graph() %>%
  add_node(label = "one") %>%
  add_node(label = "two") %>%
  add_node(label = "three") %>%
  add_node(label = "four")

# Add position information to each of
# the graph's nodes
graph <-
  graph %>%
  set_node_position(
    node = 1,
    x = 1, y = 1) %>%
  set_node_position(
    node = 2,
    x = 2, y = 2) %>%
  set_node_position(
    node = 3,
    x = 3, y = 3) %>%
  set_node_position(
    node = 4,
    x = 4, y = 4)

# View the graph's node data frame to
# verify that the `x` and `y` node
# attributes are available and set to
# the values provided
graph %>% get_node_df()

# The same function can modify the data
# in the `x` and `y` attributes
graph <-
  graph %>%
  set_node_position(
    node = 1,
    x = 1, y = 4) %>%
  set_node_position(
    node = 2,
    x = 3, y = 3) %>%
  set_node_position(
    node = 3,
    x = 3, y = 2) %>%
  set_node_position(
    node = 4,
    x = 4, y = 1)

# View the graph's node data frame
graph %>% get_node_df()

# Position changes can also be made by
# supplying a node `label` value (and setting
# `use_labels` to TRUE). For this to work,
# all `label` values in the graph's ndf must
# be unique and non-NA
graph <-
  graph %>%
  set_node_position(
    node = "one",
    x = 1, y = 1,
    use_labels = TRUE) %>%
  set_node_position(
    node = "two",
    x = 2, y = 2,
    use_labels = TRUE)

# View the graph's node data frame
graph %>% get_node_df()