Define the links to connect a pair of observations

This function allows users to define links between a pair of observations, facilitating the visualization of connections between related data points.

Usage

link_draw(.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 include a data frame with the coordinates of the pair of observations to be linked.
...: <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.