Dual indicator VAS with mirror movement

[Paul Groot]

Hi Graeme,

If you draw the indicator using inline script on a canvas, then drawing a
second indicator would just mean duplicating a few lines and reversing the
indicator position, wouldn't it? If you use the mouse cursor position to
move the indicator, you probably have to think about how to map the the
mouse cursor: does a mouse cursor position at the center of the screen
correspond to the overlapping indicators, or do you use the full mouse
cursor range from one side of the screen to the opposite to go from minimum
(centered indicators) to maximum VAS...? The first option has symmetrical
functionality.

Best, Paul


On 14 November 2013 17:06, Graeme Davidson <graeme.r.davidson at gmail.com>wrote:

> Hello there,
>
> I was wondering if anyone could help me with a problem.
>
> I'm trying to design a visual analogue scale with two indicators which
> have reflective movement on the same scale line. So essentially a
> participant would see an image and then be asked to rate the weight of the
> image. I have no problems doing this on a single indicator VAS but my
> research supervisor would like it so that there are two indicators, and
> when you move one the other indicator moves in a mirrored movement. The
> best I could describe it as is a vice movement so when one indicator move
> out from the centre of the scale the other indicator moves out from the
> centre too.
>
> Does anyone know how I'd go about designing such a scale?
>
> I'd appreciate any help, on how to program this movement.
>
> all the best
>
> Graeme
>
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