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Re: Interfacing the functions [message #30125 is a reply to message #30121]

Sun, 07 April 2002 19:09

Mark Hadfield
Messages: 783
Registered: May 1995

Senior Member

"Akhila" <idlfreak@yahoo.com> wrote in message
news:b1ad7b05.0204071626.691b0575@posting.google.com...
> ...I have individual program that performs the following:
> a. Zoom in and Out
> b. Pan
> c. Contrast adjustments
> d. Brings the next slice
>
> Mouse controls all these....Please tell me how I can link all these
> functions so that I can perform these on an image.

You need to modify your event-handling code so that the action it takes
depends on the mouse button that was pressed (the "press" tag in the event
structure for mouse events with type 0) or released (the "release" tag in
the event structure for mouse events with type 1).

I have puzzled over how to make mouse-event-handling code reasonably simple
& flexible. I settled on the idea of "mouse-handler" objects. Each
graphics-window object has (up to) 3 such handlers; code in the window's
event-handler sends mouse events to the appropriate handler; each mouse
handler is responsible for remembering its state and calling the window's
methods as necessary. The window object normally displays droplist widgets
by which the user can select the handler for left and middle buttons; the
right button is normally associated with a context-menu handler. This
approach is implemented in the following files

http://katipo.niwa.cri.nz/~hadfield/gust/software/idl/mgh_mo use_handler_libr
ary.pro

http://katipo.niwa.cri.nz/~hadfield/gust/software/idl/mgh_wi ndow__define.pro

You're welcome to look at this code but I warn you that it might take some
time & effort to understand what it's doing and why I wrote it that way.

--
Mark Hadfield
m.hadfield@niwa.co.nz Ka puwaha et tai nei
http://katipo.niwa.co.nz/~hadfield Hoea tatou
National Institute for Water and Atmospheric Research (NIWA)

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[Message index]

		Re: Interfacing the functions By: idlfreak on Tue, 09 April 2002 10:50
		Re: Interfacing the functions By: David Fanning on Mon, 08 April 2002 08:44
		Re: Interfacing the functions By: Jaco van Gorkom on Mon, 08 April 2002 08:31
		Re: Interfacing the functions By: David Fanning on Mon, 08 April 2002 07:56
		Re: Interfacing the functions By: idlfreak on Mon, 08 April 2002 07:23
		Re: Interfacing the functions By: Mark Hadfield on Sun, 07 April 2002 19:09
		Re: Interfacing the functions By: idlfreak on Sun, 07 April 2002 17:26
		Re: Interfacing the functions By: R.Bauer on Sat, 06 April 2002 02:11

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