Usage
interactive_rect_grob(x = unit(0.5, "npc"), y = unit(0.5, "npc"), width = unit(1, "npc"), height = unit(1, "npc"), tooltip = NULL, onclick = NULL, data_id = NULL, just = "centre", hjust = NULL, vjust = NULL, default.units = "npc", name = NULL, gp = gpar(), vp = NULL)
Arguments
x
A numeric vector or unit object specifying x-location.
y
A numeric vector or unit object specifying y-location.
width
A numeric vector or unit object specifying width.
height
A numeric vector or unit object specifying height.
tooltip
tooltip associated with rectangles
onclick
javascript action to execute when rectangle is clicked
data_id
identifiers to associate with rectangles
just
The justification of the rectangle
    relative to its (x, y) location.  If there are two values, the first
    value specifies horizontal justification and the second value specifies
    vertical justification.  Possible string values are: "left",
    "right", "centre", "center", "bottom",
    and "top".  For numeric values, 0 means left alignment
    and 1 means right alignment.
  
hjust
A numeric vector specifying horizontal justification.
    If specified, overrides the just setting.
vjust
A numeric vector specifying vertical justification.
    If specified, overrides the just setting.
default.units
A string indicating the default units to use
    if x, y, width, or height
    are only given as numeric vectors.
name
 A character identifier. 
gp
An object of class gpar, typically the output
    from a call to the function gpar.  This is basically
    a list of graphical parameter settings.
vp
A Grid viewport object (or NULL).