Drawing Line

Hi All,
I am working on app and stuck at a point. I need some help. I want to draw line into the alphabet and at the drawing line also want to check that the user is drawing line as per instruction or given number(or dot under alphabet border). If user draw line from other way then i don’t want to give him any point and if user draw line correctly then he/she will get point. Any help will appreciated.

Thanks.
Sabir
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