I have gone through the examples, but couldn't figure out how to implement it. Ideally I can use Qt Designer to set up the UI (since I need other inputs as well, and its easier to make in Designer than hardcoding it from scratch).

I would like to have 2 lines on my plot that act as x limits to a 2D curve. The curve should be draggable along the x axis, and once the mouse is released, a function will run to update the graph.

Many thanks

Qt Creator 3.0.1, Qt 5.2.1, qwt 6.1.0, Mac OS 10.9