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Interactive graph in Qt

I want to make such an interactive graph using Qt and C ++: http://jsxgraph.uni-bayreuth.de/wiki/index.php/Cubic_spline_interpolation

Any hints on how to do this?

EDIT: Ok, I've already tried my hands on the QGraphicsView class and qwt library. However, I don't find an easy way to represent interactivity. Is there an easy way to do this?

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Start with a QGraphicsview framework and diagram example



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