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| Re: Draw widget mouse position error - follow up [message #21920 is a reply to message #21901] |
Wed, 27 September 2000 00:00  |
Liam E. Gumley
Messages: 378
Registered: January 2000
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Senior Member |
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Oliver Smith wrote:
> Apologies for anyone who's already seen this follow up, it didn't propagate
> as far as deja and I only received one e-mail reply so here goes again....
>
> Finally a reply from RSI regarding this problem:
>
> "After speaking to the developers at great length on this topic, they are
> adamant that they doubt this has anything to do with IDL. The X and Y cursor
> values are simply passed to IDL by the system, so any changes between mouse
> clicks are outside of IDL's control. Therefore, if Linux is working
> correctly, it is due to the operating system producing the fault and not
> IDL."
>
> So is this an NT bug, can anyone reproduce this error under NT, but not
> using IDL?
>
> Regards,
>
> Oliver
>
> ************************************************************ ***************
>
> Original post:
>
> Hi,
>
> I use a draw widget with motion events turned on, I've noticed that a double
> click event has a different y-position to a single click event. This is
> demonstrable by the code at the bottom of this message. For a double click,
> the events returned give:
> X Y
> Cursor position = 187 110
> Cursor position = 187 110
> Cursor position = 187 111
> Cursor position = 187 110
>
> It is easy to work around the problem by detecting the double click
> (event.clicks = 2) and subtracting 1 from event.y
>
> I can recreate the problem on another computer of almost identical
> specification to my own. I am using IDL 5.3.1 on NT 4. Can anybody recreate
> this bug and on what platforms?
>
> Regards,
>
> Oliver Smith
>
> PRO DRAW_EVENT, event
> Print, 'Cursor position = ', Event.x, Event.y
> END
>
> PRO ojs
>
> base = Widget_Base(UNAME = 'WID_BASE', SCR_XSIZE=300 ,SCR_YSIZE=200) draw =
> Widget_Draw(Base, UNAME = 'WID_DRAW',SCR_XSIZE = 300, SCR_YSIZE = 200,
> /BUTTON_EVENTS, EVENT_PRO = 'DRAW_EVENT')
>
> Widget_Control, /REALIZE, base
> Xmanager, 'WID_BASE', base, /NO_BLOCK
>
> END
I ran your code in IDL 5.3 on a PC running Windows NT 4 SP6, and I saw
the same problem with both single clicks and double clicks.
I have a Kensington trackball on a flat hard surface, so the cursos does
not move unless the ball moves. I started up PaintShop Pro 6, which
tracks the cursos x/y location when you load an image. After positioning
the cursor, and tapping dozens of single-clicks and double-clicks, I
could not get the displayed cursor x/y location to move at all.
Cheers,
Liam.
http://cimss.ssec.wisc.edu/~gumley
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| Re: Draw widget mouse position error - follow up [message #21924 is a reply to message #21920] |
Wed, 27 September 2000 00:00 |
Oliver Smith
Messages: 11
Registered: March 2000
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Junior Member |
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Hi,
Apologies for anyone who's already seen this follow up, it didn't propagate
as far as deja and I only received one e-mail reply so here goes again....
Finally a reply from RSI regarding this problem:
"After speaking to the developers at great length on this topic, they are
adamant that they doubt this has anything to do with IDL. The X and Y cursor
values are simply passed to IDL by the system, so any changes between mouse
clicks are outside of IDL's control. Therefore, if Linux is working
correctly, it is due to the operating system producing the fault and not
IDL."
So is this an NT bug, can anyone reproduce this error under NT, but not
using IDL?
Regards,
Oliver
************************************************************ ***************
Original post:
Hi,
I use a draw widget with motion events turned on, I've noticed that a double
click event has a different y-position to a single click event. This is
demonstrable by the code at the bottom of this message. For a double click,
the events returned give:
X Y
Cursor position = 187 110
Cursor position = 187 110
Cursor position = 187 111
Cursor position = 187 110
It is easy to work around the problem by detecting the double click
(event.clicks = 2) and subtracting 1 from event.y
I can recreate the problem on another computer of almost identical
specification to my own. I am using IDL 5.3.1 on NT 4. Can anybody recreate
this bug and on what platforms?
Regards,
Oliver Smith
PRO DRAW_EVENT, event
Print, 'Cursor position = ', Event.x, Event.y
END
PRO ojs
base = Widget_Base(UNAME = 'WID_BASE', SCR_XSIZE=300 ,SCR_YSIZE=200) draw =
Widget_Draw(Base, UNAME = 'WID_DRAW',SCR_XSIZE = 300, SCR_YSIZE = 200,
/BUTTON_EVENTS, EVENT_PRO = 'DRAW_EVENT')
Widget_Control, /REALIZE, base
Xmanager, 'WID_BASE', base, /NO_BLOCK
END
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