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Re: FSC_PLOT defaults [message #74134 is a reply to message #74131]

Tue, 21 December 2010 10:53

Marc Buie
Messages: 12
Registered: December 2010

Junior Member

Ben writes:

>> Also, it is awkward to use
>> simultaneous instances of things that rely on (the same) global
>> variables.
>
> I'm a little fuzzy on this. How might this occur?

This is a very serious issue, especially if you use any kind of widget programming (doesn't have to be object oriented stuff, either). With widgets you can have multiple copies of the same tool each looking at different data. You can also have different tools running at once. Each of these can run asynchronously and at any time. If you have a set of graphics tools that all depend on a global variable for its behavior (and perhaps modify it) then you are stuck with every tool taking on the same behavior. Sometimes that might be ok but mostly it's not what you want.

For this reason, I never, ever use the global variables to control plots unless it's in a throwaway script. In a program, I always use the graphics keywords to set the behavior. There are ways to make the global variables work for you but you have to be _very_ careful. For me, the price is always too high.

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[Message index]

		Re: FSC_PLOT defaults By: lecacheux.alain on Mon, 27 December 2010 00:51
		Re: FSC_PLOT defaults By: David Fanning on Fri, 24 December 2010 22:01
		Re: FSC_PLOT defaults By: David Fanning on Fri, 24 December 2010 10:55
		Re: FSC_PLOT defaults By: Michael Galloy on Thu, 23 December 2010 21:05
		Re: FSC_PLOT defaults By: David Fanning on Thu, 23 December 2010 18:03
		Re: FSC_PLOT defaults By: wlandsman on Thu, 23 December 2010 16:02
		Re: FSC_PLOT defaults By: wlandsman on Thu, 23 December 2010 15:42
		Re: FSC_PLOT defaults By: penteado on Thu, 23 December 2010 12:53
		Re: FSC_PLOT defaults By: Mark[1] on Thu, 23 December 2010 12:35
		Re: FSC_PLOT defaults By: lecacheux.alain on Thu, 23 December 2010 12:34
		Re: FSC_PLOT defaults By: David Fanning on Thu, 23 December 2010 11:10
		Re: FSC_PLOT defaults By: David Fanning on Thu, 23 December 2010 10:08
		Re: FSC_PLOT defaults By: wlandsman on Thu, 23 December 2010 08:38
		Re: FSC_PLOT defaults By: David Fanning on Wed, 22 December 2010 09:11
		Re: FSC_PLOT defaults By: lecacheux.alain on Wed, 22 December 2010 05:51
		Re: FSC_PLOT defaults By: Bruce Bowler on Wed, 22 December 2010 05:22
		Re: FSC_PLOT defaults By: David Fanning on Tue, 21 December 2010 13:56
		Re: FSC_PLOT defaults By: ben.bighair on Tue, 21 December 2010 12:38
		Re: FSC_PLOT defaults By: Marc Buie on Tue, 21 December 2010 10:53
		Re: FSC_PLOT defaults By: David Fanning on Tue, 21 December 2010 09:58
		Re: FSC_PLOT defaults By: ben.bighair on Tue, 21 December 2010 09:53
		Re: FSC_PLOT defaults By: David Fanning on Tue, 21 December 2010 08:37
		Re: FSC_PLOT defaults By: wlandsman on Tue, 21 December 2010 08:19
		Re: FSC_PLOT defaults By: David Fanning on Tue, 21 December 2010 07:58
		Re: FSC_PLOT defaults By: Paul Van Delst[1] on Tue, 21 December 2010 07:39
		Re: FSC_PLOT defaults By: David Fanning on Tue, 21 December 2010 07:19
		Re: FSC_PLOT defaults By: David Fanning on Tue, 21 December 2010 07:06
		Re: FSC_PLOT defaults By: David Fanning on Tue, 21 December 2010 06:51
		Re: FSC_PLOT defaults By: David Fanning on Tue, 21 December 2010 06:45
		Re: FSC_PLOT defaults By: Marc Buie on Tue, 21 December 2010 05:58
		Re: FSC_PLOT defaults By: penteado on Mon, 20 December 2010 18:03
		Re: FSC_PLOT defaults By: ben.bighair on Mon, 20 December 2010 17:43
		Re: FSC_PLOT defaults By: David Fanning on Mon, 20 December 2010 14:57

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