Manipulating the view with joysticks

In the last example of this chapter, we would like to add joystick support to the previous 2D manipulator, which means to use joysticks to pan and scale the scene in view. OSG doesn't provide native joystick functionalities so it is time to reply on some external libraries. This time we will choose the famous DirectInput library that belongs to DirectX 8 and higher versions. With some modifications to the last example's code, we can quickly add supports of DirectInput devices and make use of them in camera manipulators, callbacks, and event handlers.