Visual Analog scale position logging

[Paul Groot]

Hi Matt,

I think that would be possible by modifying the DragScale function in the
VAS.epk2 package. A while-loop is used in this function to refresh the
needle when it is moved around. It's not very difficult to add a few lines
that will save the needle position periodically. The modified attachment
should do something like that. The 1-sec positions are now saved as
attribute with incremental suffix (xyz.1, xyz.2 etc.). Another option would
be to force logging at each interval by inserting a call to c.Log. In that
case it is not required anymore to add the suffix, so all results would be
inserted into the same xyz column of the output file. However, you will get
more rows instead of columns.

Best
Paul

P.S. These are the inserted lines:

*line 10+11:*
Dim lSavePosAt As Long ' next time to save position
Dim lSavePosCount As Integer ' counter to

*line 41+42:*
lSavePosAt = Clock.ReadMillisec + 1000 ' save position every second
lSavePosCount = 0

*lines 133-141:*
    If Clock.ReadMillisec>=lSavePosAt Then
        lSavePosAt = lSavePosAt + 1000
        lSavePosCount = lSavePosCount + 1
        percent = 100*((ptPress.X-VAS_SliderDummy.Left)/sw)
        If percent<0 Then percent = 0
        If percent>100 Then percent = 100
        ' save the percent value
        c.SetAttrib attributeName & "." & CStr(lSavePosCount), percent
    End If




...



On 3 May 2014 17:00, Matt Riddle <matthewpriddle at gmail.com> wrote:

> Hi,
>
> I'm fairly new to anything beyond basic ePrime functions, so I apologize
> if this seems like a simple question.
>
> I'd like to implement some form of Paul Groot's visual analog scale, but
> what I would like eprime to do is record the position on the scale every
> second or so.
> So let's say the participant was letting his mind wander, and was
> continuously moving the scale up and down according to how they were
> feeling, and then
> having ePrime log wherever the indicator is on the scale. What would be
> the easiest way to go about doing this? I don't know if the scale treats
> the indicator
> as a mouse cursor or what, so I'm a little clueless what to do.
>
> Thanks in advance for your help!
>
> -Matt
>
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