Dual indicator VAS with mirror movement

[Graeme Davidson]

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

[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

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