Pick Type (edgPickType)

Software Customisation Reference Manual

Event Driven Graphics : Pick Type (edgPickType)

The pick type object defines the basic types of picks that can be performed by the system. Whereas the pick packet defines how many and what types of pick are required for a pick sequence.

There are two main objects the pick type object returns to the calling objects, these are:

•

edgPickData this object contains all the information about the pick on the graphical canvas, without the data being post processed to derive a position, etc.

•

edgPositionData this object is basically the same data as the edgPickData but the data has been processed either by the edg positioning control object, to determine the derived position of the picked item or the position picked on the items has been derived using some basic rules.

In some instances, certain pick type methods return only a basic object, e.g. POINTVECTOR, etc.

This section of the document DOES NOT give a detailed explanation of the members and principles of this object. As in most cases, changing any of the members will seriously affect the workings of the object.