Qwt is a graphics extension to the Qt GUI application framework. It provides a 2D plotting widget and more.
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If you don't mind reading a bit of code (examples, the library itself) its really flexible and feature rich. I really love it.
Very useful and versatile library! Like it very much!
Fast, responsive, mostly flexible, extendable - sometimes a bit odd to use.
this project very useful.
I love it!