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FLTK is an object-oriented widget toolkit written in the programming language C++.While GTK is mainly optimized for the X Window System, FLTK works on other platforms, including Microsoft Windows (interfaced with the Windows API), and OS X (interfaced with Quartz).
A reflector sight or reflex sight is an optical sight that allows the user to look through a partially reflecting glass element and see an aiming point or some image (helping to aim the device, to which the sight is attached, on the target) superimposed on the field of view.
The pre-set number was selected via a large dial on the front of the sight, and the range was then measured by turning another dial on the aircraft's throttle. [5] This new sight became the Mark II Gyro Sight, which was first tested in late 1943 with production examples becoming available later in the same year.