Picking

Previous to the implementation of the EDG functionality, picking within the graphics view had a limited scope, in that it was a means to navigate to an element in the database or a way of identifying and returning some key features on an item in the graphics, that means, ppoints or plines.

What EDG allows now is a richer set of functions that allow the user to specify the type of pick the user can perform, which can have predefined criteria applied to them and richer set of return information that the user can use without having to derive the information within their own application code.