MapTapEvent
MapTapEvent class has the following properties:
coordinates
 The coordinates at which the pointer contacted the screen.
global_x
 The x component of the global position at which the pointer contacted the screen.
global_y
 The y component of the global position at which the pointer contacted the screen.
local_x
 The x component of the local position at which the pointer contacted the screen.
local_y
 The y component of the local position at which the pointer contacted the screen.