I am using Affinity Designer to create another plywood model boat – the world needs more – and I have nothing bad to say about this £50 app. But it cannot rival the likes of Autocad (more than 10 times the price). One thing I want to do is measure irregular objects on-screen and that is proving tricky. 
In the physical world the flexible curve is invaluable but is there one for Windows? It doesn’t appear so, only straight line rulers are available. So, print out the shape, check the printout size matches that on screen, then measure with the flexible curve. There must be a better way?
FlagFly 