How do I create a One Touch Drawing game?

How do I make the game recognize some symbols drawed (by touch or mouse) as controls?

A good example of what I'm trying to say is this cute goodledoodle halloween game:

google.com/doodles/halloween-2016

Depends on how complex are these shapes. Check out this post:

construct.net/en/forum/construct-3/general-discussion-7/unistroke-gesture-recognizer-154572

Also, there are a few paid templates on Scirra store:

scirra.com/store/search

Depends on how complex are these shapes. Check out this post:

https://www.construct.net/en/forum/construct-3/general-discussion-7/unistroke-gesture-recognizer-154572

Also, there are a few paid templates on Scirra store:

https://www.scirra.com/store/search?q=gesture

Thank you dop2000, this have helped me a lot :)