Question : how to get move line through mouse drag in view?

mouse click on line drawn in view not givin correct x,y value.
how to get move line through mouse drag in view?
eg:
if I draw a line through ondraw() on moveto(100,100); lineto(200,200)
if I click mouse on starting point of line then its gives 20,10
I am using splitter view.

Answer : how to get move line through mouse drag in view?

That usually means that one set of X,Y are in "screen coordinates" and the other X,Y is in "client" (or "window") corrdinates.  Use the ClientToScreen() API:

   How To Translate Client Coordinates to Screen Coordinates
   http://support.microsoft.com/kb/11570

   ClientToScreen (API fn)
   http://msdn2.microsoft.com/en-us/library/ms532670.aspx