[GUI] Ruler for Topography Creator
Problem to solve
Adding a ruler function to the Topography Creator
to measure lengths.
Further details
When modelling the scenarios from zhang-2011 with their changes in entrance width, I have noticed that I'm using the cursor to try to figure out sizes. It might be helpful for this type of scenario to have a ruler function in the topography creator with which one can draw a line and see it's length.