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Widget motion event in data coordinates? [message #402]

Thu, 27 August 1992 13:04

sullivan
Messages: 2
Registered: August 1992

Junior Member

I want to print out the lat-lon coordinates of the mouse moving
within a draw widget. The event handler sends the coordinates in
device coordinates. How do I convert device coordinates to data
(lat-lon) coordinates? I use the cursor procedure but it slows the
program down.
Thanks, dan

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~
Dan Sullivan # Laboratory for Terrestrial Physics (STX)
# Code 920.2
sullivan@gorgo.gsfc.nasa.gov # NASA-Goddard Space Flight Center
# Greenbelt, MD 20771
# voice: (301) 286-2484
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~

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Re: Widget motion event in data coordinates? [message #550 is a reply to message #402]

Thu, 27 August 1992 12:06

thompson
Messages: 584
Registered: August 1991

Senior Member

In article <1992Aug27.130439@gorgo.gsfc.nasa.gov>, sullivan@gorgo.gsfc.nasa.gov (Dan sullivan) writes...
>
> I want to print out the lat-lon coordinates of the mouse moving
> within a draw widget. The event handler sends the coordinates in
> device coordinates. How do I convert device coordinates to data
> (lat-lon) coordinates? I use the cursor procedure but it slows the
> program down.

The command

CONVERT_COORD,X,Y,/DEVICE,/TO_DATA

should do the trick.

Bill Thompson

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