This is the port of Qwt library version 6. The Qwt library contains
GUI Components and utility classes which are primarily useful for
programs with a technical background.  Beside a 2D plot widget it
provides scales, sliders, dials, compasses, thermometers, wheels
and knobs to control or display values, arrays, or ranges of type
double.

WWW: http://qwt.sourceforge.net/