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Re: Resizeable Graphics window [message #75197 is a reply to message #75117]

Thu, 17 February 2011 13:13

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

wlandsman writes:

> Another resizeable window question:
>
> Do device coordinates make any sense in a resizeable window (when the size of your "device" is always changing)?
>
> Below I give a test program that displays error bars, but first converts the data to device units. It works fine in a normal window, but if I create a resizeable window (i.e. test,/window) the lines are plotted incorrectly.
>
> In this case, the use of device coordinates is perverse, but they are sometimes useful for "ornamental" figures. For example, setting the size of an arrow or the "hat" on an error bar to one-fiftieth of the screen size.

The problem here is that cgWindow is "hiding" itself
from the rest of IDL. That is to say, you are going
to have to go to some trouble to write into a cgWindow
graphics window accidentally. This is probably why
you can't calculate the device coordinates correctly.
The "current" graphics window is not the cgWindow
graphics window when you are doing the calculations.
(Although it probably looks like it might be.)

To do the calculations properly, you are going to have
to make the cgWindow graphics window the "current"
graphics window, do the calculations based on that
window, add your commands, etc.

cgWindow
WSet, cgQuery(/Current)
deviceCoords = Convert_Coord(dataCoords, /To_Device)
etc.

Maybe cgWindow needs a CoordConvert method. Let me give
this some thought. This would make it possible to know
where you are in the window, so we could report it. But,
again, we are going in the direction of Coyote Graphics 2.0.

Cheers,

David

--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")

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[Message index]

		Resizeable Graphics window By: wlandsman on Thu, 17 February 2011 11:35
		Re: Resizeable Graphics window By: Jeremy Bailin on Fri, 18 February 2011 06:53
		Re: Resizeable Graphics window By: David Fanning on Thu, 17 February 2011 13:23
		Re: Resizeable Graphics window By: wlandsman on Thu, 17 February 2011 13:21
		Re: Resizeable Graphics window By: David Fanning on Thu, 17 February 2011 13:13
		Re: Resizeable Graphics window By: wlandsman on Thu, 17 February 2011 13:05
		Re: Resizeable Graphics window By: wlandsman on Thu, 17 February 2011 13:01
		Re: Resizeable Graphics window By: Jeremy Bailin on Thu, 17 February 2011 12:56
		Re: Resizeable Graphics window By: David Fanning on Thu, 17 February 2011 12:52
		Re: Resizeable Graphics window By: David Fanning on Thu, 17 February 2011 12:44

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