For my experiment the participants click on an image of a graph, and then it returns x and y mouse click coordinates. The problem I am having is how to convert those coordinates to the location on the image (which in this case is a graph) that they clicked.
My understanding is that if I use height units, the images will be the same size proportionally across all windows, so if I were able to get the participants window size then I could determine the height units of their window which would then let me determine the height units on the image I am using which would then tell me the location of the mouse click on my image.
What I am having trouble doing is getting the participants window size.
I also want to make sure my logic is correct that height units will show the images proportionally to the window size.