Record cartesian coordinates based on what is drawn with the mouse -

i'm looking program able record cartesian coordinates generated pattern drawn mouse

an example if traced regular y=x^2 parabola -2 - 2; program should generate

{(-2,4),(-1,2),(0,0),(1,2),(2,4)} 

or if made diagonal line, obtain

{(0,0),(1,1),(2,2),(3,3)} 

ideally, transparent window place window on function or frequency , trace on shape cartesian coordinates within range.