A base version of link_draw(), optimized for performance. This function
serves as the foundation for building other link_* functions that manage
the drawing of links between pairs of observations.
.link_draw(.draw, ...)A function used to draw the links. The function must return a
grob() object. If the function does not return a valid
grob, no drawing will occur. The input data for the function should be
a list, where each item is a data frame containing the coordinates of
the pair of observations.
<dyn-dots> A list of formulas, where each side
of the formula should be an integer or character index of the original
data, or a range_link() object defining the linked observations. Use
NULL to indicate no link on that side. You can also combine these by
wrapping them into a single list(). If only the left-hand side of the
formula exists, you can input it directly. For integer indices, wrap them
with I() to use the ordering from the layout. You can also use
waiver() to inherit values from the other group.
link_draw()