The ANNMOVEPOINT structure contains information about an annotation object when moving a point of the object in automated mode.
The ANNMOVEPOINT structure is part of the union of the ANNCHANGEPARAM structure. For more information, see the documentation for ANNCHANGEPARAM.
A handle of an annotation object can be moved in automated mode by dragging the handle with the mouse. Doing so causes a WM_LTANNEVENT message to be sent where wParam is ANNCHANGE_ ANNCHANGE_MOVE_POINT and lParam points to a structure of type ANNCHANGEPARAM. In this case, the union of ANNCHANGEPARAM is type ANNMOVEPOINT. This message is sent when one of the following events occurs:
Starting the move point (with a mouse click): two messages are sent, one before and one after the initial mouse click. The nState field is set to STATE_BEGIN. The pt field contains the location of the mouse click, in client coordinates.
Moving the point of the object (by dragging the mouse): Pairs of messages (one before and one after) are sent for each mouse move. The nState field is set to STATE_UPDATE, and the pt field contains the location of the mouse.
Ending the move point (by releasing the mouse): One pair of messages is sent (one before and one after) for the mouse up. The nState field is set to STATE_END, and the pt field contains the location of the mouse when released.
Medical Web Viewer .NET