AW: Growing feedback bar

[Michael P. Berner]

Leisha,

one possible solution might be continually resetting the width of the
SlideImage object (i.e., the bitmap of your bar) via an Attribute (e.g.,
[BarWidth]) that is incremented in an InLine script whenever the participant
scores a point. Crucially, the Stretch option of the SlideImage would have
to be set to Yes. In this way, the bar "grows" with the increments as the
bitmap is stretched to the newly set width of the SlideImage. One limitation
of this approach is that you can increment in steps of 1 percent only, and
I'm not sure whether that would suffice to create the impression of smooth
growth you're looking for (esp. given the maximum score of 28 points, which
limits your successive increments for each point to 3 steps; with increments
of 4 points you will eventually run out of screen space).

best wishes  --  Michael Berner

--------
Department of Psychology
University of Wuerzburg, Germany
http://www.psychologie.uni-wuerzburg.de/i3pages/




-----Ursprüngliche Nachricht-----
Von: eprime at mail.talkbank.org [mailto:eprime at mail.talkbank.org] Im Auftrag
von Leisha Wharfield
Gesendet: Mittwoch, 1. August 2007 21:52
An: 'E-Prime'
Betreff: Growing feedback bar

Hi, all,

What would be the easiest way to create a bar that grows on the screen? 
Subjects can earn up to 28 points, so a green progress bar will grow 
every time they earn a point. I have 28 bars of various sizes, but we 
want the bar to appear to grow, so I also have a piece of the bar that 
is one-quarter of one point. I want to add it to the top of the bar in 
quick succession so that the bar appears to grow. The problem is 
determining the exact place on the screen to place the little bar piece.

Is there an easier way?

Leisha Wharfield
Decision Research
Eugene, Oregon USA