Number Line

[David McFarlane]

Stock reminder:  1) I do not work for PST.  2) PST's trained staff 
really does like to take any and all questions at 
http://support.pstnet.com/e%2Dprime/support/login.asp , and they strive 
to respond to all requests in 24-48 hours -- this is pretty much their 
substitute for proper documentation, so make full use of it.  3) If you 
do get an answer from PST Web Support, please extend the courtesy of 
posting their reply back here for the sake of others.

That said, here is my take ...

Both fairly simple to do, but will require some inline code.

1) I imagine you mean to have the subject make a single mouse click and 
use that for the response.  In that case, once you have the mouse 
coordinates you can simply draw a mark using the Canvas drawing methods 
(see the Canvas topic in the online E-Basic Help).

2) Yes.  You know the pixel coordinates of the start & end of the line, 
you know the mouse click coordinates, and you know your scaling factor. 
  From there it is just a bit of simple math (or more exactly, 
elementary analytic geometry).  Surely you can take it from there, 
otherwise you have bigger problems :).

Regards,
-- David McFarlane, Professional Faultfinder
"For a successful technology, reality must take precedence over public 
relations, for nature cannot be fooled."  (Richard Feynman, Nobel 
prize-winning physicist)


Rachna wrote:
> I have a mental number line task in which the participant is presented
> with a line (range 0 to 1000) and they are given a number. They then
> need to indicate where the number would go on the line.
> 
> 2 questions
> 1) Is there a way for participants to draw a hash mark on the line
> much like doing it on paper?
> 2) Can e-prime then calculate the number equivalent to where the hash
> mark is placed?
> 
> I have a version now that works with a slider bar but we do not want
> to use a slider bar since it provides a reference of where the numbers
> could comparatively be placed.
> 
> Please let me know if you have any ideas.

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