Added the helper functions

`node_aes()`

,`node_data()`

,`edge_aes()`

, and`edge_data()`

to facilitate the binding of node and edge aesthetic and data attribute values; several functions now have namesake arguments that accept these functions’ output.Information about the graph is now displayed in the console when the graph object is called

Error messages are now more helpful and try to provide pointers for the more common errors

Added functions to generate 2D and 3D grid graphs (

`add_grid_2d()`

and`add_grid_3d()`

)Added

`_ws`

(with selection) variants of the`mutate_[node/edge]_attrs()`

functions for mutating node or edge attributes for only those nodes/edges in an active selectionIncorporated an

`edges`

argument into the`select_edges()`

function in order to filter the selection of edges to a set of edge ID valuesReduced the dependency on R to version >= 3.2.0

Added functions to generate 2D and 3D grid graphs (

`add_grid_2d()`

and`add_grid_3d()`

)Added

`_ws`

(with selection) variants of the`mutate_[node/edge]_attrs()`

functions for mutating node or edge attributes for only those nodes/edges in an active selectionIncorporated an

`edges`

argument into the`select_edges()`

function in order to filter the selection of edges to a set of edge ID valuesReduced the dependency on R to version >= 3.2.0

Simplified many functions internally

Added a default print method for graph objects

Allowed use of bare node or edge attribute names in many functions

Implemented graph actions as a means to run one or more functions at every graph transformation step; for example, this can be used to automatically update a node attribute such as

`betweenness`

whenever modifications to the graph are made (e.g., adding nodes, removing edges, etc.)Data frames can be set as node or edge attributes with the

`set_df_as_node_attr()`

and`set_df_as_edge_attr()`

functions; the`get_attr_dfs()`

function allows for retrieval of stored data frame dataAdded two new graph-generating functions (

`add_gnp_graph()`

,`add_pa_graph()`

, and`create_complement_graph()`

)Added functions to clone existing nodes and edges (

`add_n_node_clones()`

and`add_edge_clone()`

)Added several

`count_*`

functions (`count_asymmetric_node_pairs()`

,`count_automorphisms()`

, etc.)Added new functions to obtain graph properties (

`get_adhesion()`

,`get_girth()`

,`get_reciprocity()`

, etc.)Added several

`is_*`

functions for graph and edge properties (e.g.,`is_edge_loop()`

,`is_graph_dag()`

, etc.)The

`mutate_node_attrs()`

and`mutate_edge_attrs()`

functions now have simpler and more powerful interfaces for mutating node and edge attributesGraphs can be easily saved to disk (and read from disk) using the

`save_graph()`

and`open_graph()`

functions

Modified basic structure of node and edge data frames such that ID values are automatically set as integer values

Just as nodes do, edges now have edge ID values (they can be obtained using

`get_edge_ids()`

and they can be used directly in the`select_edges_by_edge_id()`

function)When created, a graph object automatically generates a graph ID and graph name (which can be modified using

`set_graph_name()`

)So long as node

`label`

values are unique, they may now be used to compose edges using the`add_edge()`

function with`use_labels = TRUE`

Quickly and flexibly add color to nodes and edges using the

`colorize_node_attrs()`

and`colorize_edge_attrs()`

functionsAdded functions to selectively modify existing node and edge attributes:

`copy_[node/edge]_attrs()`

,`drop_[node/edge]_attrs()`

,`mutate_[node/edge]_attrs()`

,`recode_[node/edge]_attrs()`

,`rename_[node/edge]_attrs()`

, and`rescale_[node/edge]_attrs()`

.New node and edge attributes can now be easily added to a graph via a data frame using the

`join_node_attrs()`

and`join_edge_attrs()`

functionsSeveral graph generators are available for quickly adding graph primitives to a graph object (

`add_balanced_tree()`

,`add_cycle()`

,`add_full_graph()`

,`add_path()`

,`add_prism()`

, and`add_star()`

)All traversal functions can now migrate numeric node or edge attribute values to the traversed edges (e.g.,

`trav_out_edge()`

,`trav_in_node()`

) by providing an attribute name to`copy_attrs_from`

; for those traversal functions where nodes or edges may receive multiple values, one can specify an aggregation type in their`agg`

argument (e.g,.`trav_in_node()`

,`trav_both_edge()`

)Multiple conditions can be specified for all traversal types and for the

`select_nodes()`

and`select_edges()`

functions, plus, they are much easier to writeAdded the

`mk_cond()`

helper function for creating conditions for any of the traversal functions (`trav_...()`

), and, the`select_nodes()`

and`select_edges()`

functions; this helper allows for easier composition of selection/traversal conditions using variables and/or function callsWith a selection of edges one can now use

`select_rev_edges_ws()`

to transform that selection to that of the selected edges’ reverse edges (where available); the option is there to add the reverse edges to the edge selection or to simply replace the current selectionCaching attributes for later use has been made simpler with a collection of

`cache_...()`

functions (or, set the cache explicitly using`set_cache()`

); get the graph’s cache using the`get_cache()`

functionAdded functions to allow for layout control of nodes (

`set_node_position()`

,`layout_nodes_w_string()`

,`nudge_node_positions()`

)Added functions to convert

**DiagrammeR**graphs to**igraph**graphs and vice versa (`to_igraph()`

,`from_igraph()`

)Now you can create a graph from an adjacency matrix (

`from_adj_matrix()`

)Added functions to get community membership with a variety of algorithms:

`get_cmty_edge_btwns()`

,`get_cmty_fast_greedy()`

,`get_cmty_l_eigenvec()`

,`get_cmty_louvain()`

, and`get_cmty_walktrap()`

.Added functions to determine similarity coefficient scores for graph nodes:

`get_dice_similarity()`

and`get_dice_similarity()`

.Constraint scores for nodes can now be determined using the

`get_constraint()`

functionFunctions for getting information on nodes neighbors have been added:

`get_nbrs()`

,`get_non_nbrs()`

,`get_similar_nbrs()`

.Groups of nodes that are weakly or strongly connected components can be determined using the

`get_w_connected_cmpts()`

and`get_s_connected_cmpts()`

functionsGet articulation points (i.e., nodes that, when removed, disconnect the graph) with the

`get_articulation_points()`

functionObtain centrality measures for graph nodes using the

`get_closeness()`

and`get_betweenness()`

functionsGet the minimum-spanning tree subgraph from a graph with weighted edges using the

`get_min_spanning_tree()`

functionThe edge direction may be reversed for an entire graph (

`rev_edge_dir()`

) or for part of a graph using an edge selection (`rev_edge_dir_ws()`

)Depth-first search and breadth-first search algorithms are available in the

`do_dfs()`

and`do_bfs()`

functionsDegree data for plots can now be easily obtained using the

`get_degree_distribution()`

and`get_degree_histogram()`

functionsGlobal graph attributes are now more easily modifiable using a set of functions for this purpose:

`add_global_graph_attrs()`

,`clear_global_graph_attrs()`

,`delete_global_graph_attrs()`

,`get_global_graph_attrs()`

,`set_global_graph_attrs()`

Added option to display different text labels on nodes via the

`display`

node attribute; this is easily set with the`set_node_attr_to_display()`

functionRewrote many graph functions (e.g. traversals) so that they are faster for very large graphs

A log of all graph functions that directly modify the graph is now part of the graph object (

`graph$graph_log`

)Added functionality to automatically generate graph backups at every graph modification; this is in the form of RDS files deposited in a subdirectory (name is based on the graph ID) of the working directory; the option (

`write_backups`

, set to`FALSE`

by default) is available in all functions that initialize a graph object (`create_graph()`

,`create_random_graph()`

,`from_igraph()`

,`from_adj_matrix()`

)

Revised many graph functions so they work better together

Added many

**testthat**tests to maintain the quality of the graph functionsAdded functions

`create_random_graph()`

,`import_graph()`

,`combine_graphs()`

,`country_graph()`

and`select_graph_from_series()`

Added support for

**visNetwork**graphs as a rendering option with`render_graph()`

Renamed functions

`graphviz_graph()`

and`graphviz_render()`

to`create_graph()`

and`render_graph()`

, respectivelyRemoved function

`graphviz_export()`

(exporting now handled with`render_graph()`

)Added several new functions to inspect, analyze, and modify graphs:

`display_graph_object()`

,`node_info()`

,`edge_info()`

,`node_present()`

,`edge_present()`

,`get_nodes()`

,`get_edges()`

,`get_predecessors()`

,`get_successors()`

,`node_count()`

,`edge_count()`

,`is_graph_empty()`

,`is_graph_directed()`

,`add_node()`

,`add_edges()`

,`delete_node()`

,`delete_edge()`

,`node_type()`

,`edge_relationship()`

,`create_series()`

,`add_to_series()`

,`remove_from_series()`

,`graph_count()`

,`subset_series()`

,`trigger_script()`

,`render_graph_from_series()`

, and`series_info()`

Added several functions to work with graphs:

`create_nodes()`

,`create_edges()`

,`combine_nodes()`

,`combine_edges()`

,`scale_nodes()`

,`scale_edges()`

,`get_nodes()`

,`node_info()`

,`graphviz_graph()`

,`graphviz_render()`

, and`graphviz_export()`

Removed the

`graphviz_nodes_edges_df()`

and`graphviz_single_df()`

functions

Added support for subgraphs and Gantt charts in

**mermaid**diagramsAdded function

`graphviz_nodes_edges_df()`

for generating**Graphviz****DOT**code that defines nodes and edges (and their attributes) from data in two data frames: one for nodes, the other for the edge operationsAdded function

`graphviz_single_df()`

for generating**Graphviz****DOT**code from a single data frameIncorporated the new substitution operators

`@_{...}`

or`@^{...}`

in`grViz`

statements for subscripting and superscripting, respectively

Added support for substitution in

**Graphviz**graph specificationsAdded support for

**Graphviz**diagrams in the**Shiny**app

- Added support for the
**Graphviz****neato**,**twopi**, and**circo**engines

- Added the
**viz.js**library to enable**Graphviz**support

Initial release

Incorporated into the

**htmlwidgets**frameworkAdded basic

**shiny**app