| Re: FG-arithmetic error and moving objects [message #90454 is a reply to message #90449] |
Tue, 03 March 2015 06:00   |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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Helder writes:
> Now the problems:
> 1) If I select the circle (blue data) and I try to move it, I can only do that for specific mouse positions. These positions are not consistent with the line. Is this a feature or a bug?
> 2) I cannot move the line at all except if I try to rescale it. Is this a feature or a bug?
> 3) With the above code I get inconsistent math error messages that I cannot pin down to a specific operation.
As I pretty much expected, your example doesn't work at all in the
version of IDL (8.2.3) I have. On the other hand, it doesn't throw
errors when I move the mouse. ;-)
What it does do, and this made me think I was either going crazy or the
coffee was especially strong this morning, is cause faint (you might say
subliminal) yellow copies of the circle to appear at random locations in
the window, even when I stop moving the mouse! It is one of the
damnedest things I've ever seen in IDL. :-)
Oh, now as I stare at the window, I occasionally see a cyan version of
the line popping into momentary existence, too. This must be what it is
like to chase subatomic particles in a bubble chamber. I thought at
first this must have something to do with my glasses, but it happens
when I hold my head completely still. It is like a memory of the two
objects flickering into and out of existence. Fascinating!
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
Sepore ma de ni thue. ("Perhaps thou speakest truth.")
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