Hi,
I want to make something like a visual analog scale. Participants should rate stimuli by clicking on a glass which then is filled up to the point where they clicked (no "filling animation", just the glass filled to that point) and then click a button if want to continue. From what I found, it is not possible to make a vas in DirectRT (but in MediaLab which I do not have access to). I tried using different images that appear when participants click on predefinded areas (and setting the button as the correct answer to continue to the next trial), but I don't know how to make this in one trial. I used jumping to jump to specific trials, but then I have a little flash between the different glasses because the screen is prepared. My question would be, is it possible to do this in one trial, i.e. get rid of the flashing?
A second problem I have is that it should be possible to get back to a less filled glass, e.g. starting with an empty glass, clicking on top to have full glass, clicking in the middle to have it half filled. I could do this by jumping between trials, but how do I know how much the glass was filled when they hit the button? I would need to have these "jump trials" for every trial which would make a huge amount of trials.