Define the links to connect the marked observations

A base version of mark_draw, designed for performance optimization. This function is used to build other mark_* functions that manage the drawing of links between marked observations.

Usage

.mark_draw(.draw, ...)

Arguments

.draw

A function used to draw the links. The function must return a grob() object. If the function does not return a valid grob, nothing will be drawn. The input data for the function contains a list, where each item is a list of two data frames: one for the panel side coordinates ("panel") and one for the marked observations coordinates ("link").

...

<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.

See also

mark_draw()