Hi, I am developing an application about tracing for preschoolers.

Currently, I am developing a application and is using touch screen that does tracing. Currently, I am using mouseListener because if I am not wrong, touch screen basically equals mouse clicks. So now my application can does drawing. Next, I need to display a letter say "A", how can I validate it? E.g when user trace A, if position is right, tracing display, else tracing will not appear. My 2 cents was using colour recgonition. E.g, system display "A" in grey, when user click the "A" part which is grey in colour, ink become black and paint over the areas being traced. I have no idea how to start searching because I think I am being rather unclear. Hope somebody could understand me and give me some opinions as of how could I do it if what I think is not feasible or some resource for me to research on. If don't understand, feel free to post and I will try my best to explain again.

Thanks.