Initializes an annotation stack with a user-specified data.
quad_init(position, data = waiver(), ...)A string of "top", "left", "bottom", or "right" indicates which annotation stack should be initialized.
Default dataset to use for the annotation stack. If not specified, a dataset must be provided for each plot added to the layout. Possible values:
waiver(): try to inherit from the quad_layout().
NULL: no data for the annotation stack.
Any data which can be coerced by
fortify_matrix()/fortify_data_frame()
Data conversion depends on whether the annotation stack will align the observations:
If aligned, fortify_matrix() will be applied to convert the data
into a matrix.
If not aligned, fortify_data_frame() will be used to convert the
data into a data frame.
Additional arguments passed to fortify_matrix() or
fortify_data_frame().