Kindly explain how to take drawing based input in matlab GUI?

There is often a demand to take input from the user by providing a suitable workspace(canvas) and the user provide the input in the form of drawing, which needs to be converted to numerics to use further in determining the output.

[Walter Roberson]

Is the user drawing, such as doing a mechanical drafting, after which you need to do OCR??

[Ahmed Anas]

If you know about etabs, in which we draw beams and columns as input, i am taking about that type of input..