How to draw clothoids graphically in Qt?

Question

I am trying to build an application which the user can use to draw clothoids with the mouse, i.e. to set the start point and the end point of the spiral and then by dragging

Answer 1

The best approach would probably be to use the Graphics View Framework.

There are a few examples that should help you getting started in the Graphics View Examples page. The Diagram scene one looks like a good starting point for what you want to achieve.