[OPTIONAL]:returns graph data for a point where the stylus taps the screen (if a data point exists there) NOTE: the return value must be typecast to the proper user data as was initially input by the user.
Documentation
[OPTIONAL]:returns graph data for a point where the stylus taps
the screen (if a data point exists there)
NOTE: the return value must be typecast to the proper user data
as was initially input by the user.
Parameters:
br - pointer to the data structure of the actual graph
ret - pointer to the returned and filled data structure
x - ,y coordinates where the stylus tapped the screen
