I am designing an interface for an application in which operators have to enter the dimensions of boxes they are handling. They place each box on a flat surface, and then use a tape measure. This has to be done at some speed in a fairly confined space.
I am thinking of displaying something along these lines.
The operator would use the numeric keypad to enter the data, and tabbing would move from entry field to entry field (I would probably reassign one of the keypad buttons to function as a tab key).
The boxes vary enormously, so while this shape might resemble most, others could be almost packetlike (i.e. very low in height).
The question I have is this: is this graphical representation really useful, or would three vertically arranged entry fields be better? Or is there another way altogether?