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Re: Interfacing the functions [message #30120 is a reply to message #30118]

Mon, 08 April 2002 07:56

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Akhila (idlfreak@yahoo.com) writes:

> Thanx for ur help. But its difficult to control all these functions
> using mouse. I'd like to have buttons and after clicking the button
> for a particular function, the mouse move or up or down will perform
> that operation.
>
> Eg: When i click on the zoom button, then i'd like to zoom in and out
> using the mouse up/down/move.
>
> Something similar to XOBJVIEW in the lib/utilities. I am not able to
> comprehend that code. can somebody help me with that or suggest some
> simpler version.

Oh, dear. Let me try.

You create your four buttons: "Zoom", "Pan", "Adjust", "Next".
The event handler for the buttons sets up the current "mode":

PRO Button_Events, event
IF event.select NE 1 THEN RETURN
Widget_Control, event.top, Get_UValue=info, /No_Copy
Widget_Control, event.id, Get_Value=buttonValue
info.currentMode = buttonValue
Widget_Control, event.top, Set_UValue=info, /No_Copy
END

You have four different event handler procedures written
that do the different functions: "zoom_events", "pan_events",
"adjust_events", and "next events". You already have these
event handler procedures written, it sounds like. So you
attach a new event handler to the draw widget, call it
"draw_widget_events". Its purpose is to call the real
event handler based on what mode the program is currently in:

PRO Draw_Widget_Events, event
Widget_Control, event.top, Get_UValue=info, /No_Copy
CASE info.currentMode OF
'Zoom': zoom_events, event
'Pan': pan_events, event
'Adjust': adjust_events, event
'Next': next_events, event
ENDCASE
Widget_Control, event.top, Set_UValue=info, /No_Copy
END

It really is about that simple. :-)

Cheers,

David

P.S. But I agree with Mark, this really should be written
as an object. :-)

--
David W. Fanning, Ph.D.
Fanning Software Consulting
Phone: 970-221-0438, E-mail: david@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Toll-Free IDL Book Orders: 1-888-461-0155

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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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