| Re: FG-arithmetic error and moving objects [message #90459 is a reply to message #90449] |
Tue, 03 March 2015 08:52   |
Dick Jackson
Messages: 347
Registered: August 1998
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Senior Member |
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Hi Helder,
I will bet that Exelis folks are taking notes from this (Hi, Chris!), so I'll add some more to your report.
On Tuesday, 3 March 2015 04:23:57 UTC-8, Helder wrote:
> Hi,
> as already discussed in previous posts, I'm having trouble with annotations on images. I have a minimal example to show three problems.
> 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. The errors look like:
>
> % Program caused arithmetic error: Floating overflow
> % Program caused arithmetic error: Floating illegal operand
> % Detected at IDLITVISDATASPACE::DRAW 2385 C:\Program Files\Exelis\IDL84\IDL84\lib\itools\framework\idlitvisdatasp ace__define.pro
> [etc.]
Here's my setup (Windows 7, same IDL as you):
IDL> help,!version
** Structure !VERSION, 8 tags, length=104, data length=100:
ARCH STRING 'x86_64'
OS STRING 'Win32'
OS_FAMILY STRING 'Windows'
OS_NAME STRING 'Microsoft Windows'
RELEASE STRING '8.4'
BUILD_DATE STRING 'Sep 27 2014'
MEMORY_BITS INT 64
FILE_OFFSET_BITS
INT 64
I do see the problems that you describe (but, as Matthew, from the IDLitSymbol object), and further: if I resize the red line, then things change, and we're now in a 3-D world. I can grab the image and end up rotating the whole space around. What is also revealed then is that the red line is no longer on the Z=0 plane. At the command line (I just pasted the lines from your procedure in there), I can do this:
(before resizing red line)
IDL> pl.getdata,xx,yy,zz
IDL> print,xx,yy,zz
125.00000 375.00000
125.00000 375.00000
0.00000000 0.00000000
(after resizing red line)
IDL> pl.getdata,xx,yy,zz
IDL> print,xx,yy,zz
125.00000 414.00000
125.00000 180.00000
0.00000000 1.7147294
That's odd, but it explains why we can suddenly rotate the space. And it's then hard to do any of the usual things with the annotations, and that's when I start seeing the arithmetic errors. (It's a good thing Ctrl-Z works at this point to Undo changes... quite dependably, but not perfectly, I find)
And to David: I'm going to guess that what you're seeing is yellow complementary afterimages. (it's all in your head! :-) Since the world is suddenly interested in our visual system this past week, I'll toss out this barely-relevant (but fascinating) link:
https://en.wikipedia.org/wiki/Lilac_chaser
Cheers,
-Dick
Dick Jackson Software Consulting Inc.
Victoria, BC, Canada --- http://www.d-jackson.com
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