mouse tracking blues

[PEChumbley at aol.com]

I used a procedure similar to this once but instead of:

  repeat until the mouse is up

I used:

  repeat while the mouse is down

I do not recall ever experiencing a problem with it not stopping to scroll.  
You might try that just to see if it makes a difference.  

Philip Chumbley



> Hi list,
> 
> First I want to point out that I've read the archives
> and am aware of Scott's advice to not use a repeat
> loop inside a mousedown handler, but to use
> mousemove / mouserelease instead.
> 
> However, I'm facing a problem for which using
> a repeat loop inside a mousedown seems to be the
> only solution, and of course I met the problem of
> the mouseup event not being trapped by my script.
> 
> In a few words, when the mouse is down on an image
> (very large one, like a panoramic) the image is supposed
> to scroll back & forth horizontally according to the position
> of the mouse relative to the loc of that image, the scroll speed
> being proportional to the distance between the mouseloc and
> the loc of the image (actually like in a QTVR).
> So I used the following script :
> 
> on mousedown
>   repeat until the mouse is up
>       show img 1 at max(-633,min(1432,(item 1 of loc of img
> 1)-(trunc(((item
> 1 of the mouseloc)-400)/10)))),300
>   end repeat
> end mousedown
> 
> It works great (very smooth scrolling), except that the up
> position of the mouse isn't recognized about 15% of the
> time, and the img keeps scrolling even when the mouse btn
> has been released.
> It is obvious that I can't use mousemove, since the image must
> keep scrolling even when the mouse isn't moving, as long
> as it is down.
> 
> I tried to use mousestilldown (which is a loop by itself) :
> 
> on mousestilldown
>       show img 1 at max(-633,min(1432,(item 1 of loc of img
> 1)-(trunc(((item
> 1 of the mouseloc)-400)/10)))),300
> end mousestilldown
> 
> It works (the release of the mouse btn is always detected),
> although the scrolling effect isn't smooth at all...
> 
> If anyone has a brilliant idea for a possible solution,
> I thank him / her in advance...
> 
> JB
> 

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