Obtaining the Draw Widget's Viewport Coordinates
QUESTION: How can I get the new viewport coordinates when the user scrolls my draw widget?
ANSWER: The new coordinates are returned with the Get_Draw_View keyword to the Widget_Control procedure. The return value is a two-element array with the X and Y coordinates of the lower-left corner of the visible image on the larger canvas.
Put this code into your draw widget's event handler:
Widget_Control, event.id, Get_Draw_View=thisView Print, thisView
Copyright © 1998 David W. Fanning
Last Updated 8 September 1998