I made a pattern showing all Valentina drawing operations, line styles and colours.
You can discover using your intuition theses operations by clicking on each point, the tool option panel will show the operation and its parameters. Note you have to right click on the point and select option in the pop-up menu to get the involved points.
operations-demo.val (15,1 Ko)
Note: there is a minor bug on Bezier curve intersection having same start and stop point.
Last a detail demo:
detail-demo1.val (4,3 Ko)