Package index • grrr

Core Scene Graph

Primary objects for describing graphics scenes

grab_atom(): Create a primitive grab (leaf node)
grab_bag(): Create a bag grab (interior node)
scene(): Create a scene (root grab_bag with device dimensions)
assign_node_ids(): Assign deterministic node IDs
is_grab(): Test if an object is any grab (prim or group)

Scene Schema

Schema versioning and scene serialization

scene_schema_version(): Current scene schema version
scene_to_list(): Serialize a scene graph to a versioned R list
scene_to_json(): Serialize a scene graph to JSON
scene_to_yaml(): Serialize a scene graph to YAML

Aesthetics

Specification and management of graphic attributes

aes_spec(): Create an aesthetic specification
aes_empty(): Empty (default) aesthetic spec
aes_merge(): Merge two aes_spec objects — child overrides parent
aes_resolve(): Resolve an aes_spec against defaults, returning a plain list

Units & Viewports

Coordinate systems and layout

rel(): Create a relative unit (fraction of parent dimension)
mm(): Create an absolute unit in millimetres
resolve_unit(): Resolve a unit to millimetres given a parent dimension in mm
unit_add(): Add two units, possibly of different types
vp(): Create a viewport
vp_grid(): Create a grid of viewports (CSS-grid inspired)

Rendering

Turning scene graphs into output

render_scene(): Render a scene or grab tree using a backend device
device_backend(): Create a backend device contract
is_device_backend(): Test if an object is a backend device
device_svg(): Create an SVG backend device

Utilities

Inspection and introspection

prim_shapes(): Valid primitive shape names
grab_tree(): Return a tidy data.frame describing the scene tree structure
grab_filter(): Filter rows in atom data
grab_mutate(): Add or modify columns in atom data
grab_select(): Select columns from atom data
grab_left_join(): Left-join lookup data into atom data
grab_modify_data(): Modify atom data in a grab tree
grab_map_atoms(): Apply a function to every atom in a grab tree
dfr(): Create a compact row-data tibble

Integration

Bridges to other systems

ggbuild_to_scene(): Convert a ggplot_build() result to a grab scene