A simple utility library to help visualizer the behavior of
PID controllers.
This is meant to be used together with
libacfutils's pid_ctl_t facility.
See acfutils/pid_ctl.h for more details on the implementation.
To use pidvisualizer, you simply call pidvis_new with a short name (which
will be shown as the name of the PID controller in the window's title),
a pointer to the pid_ctl_t you wish to visualize and an optional
mt_cairo_uploader_t (see acfutils/mt_cairo_render.h for that, or pass NULL
if you don't want to use an async uploader). This will give you a pid_vis_t
object. You can then call pidvis_open to open the window. The PID visualizer
continuously samples the PID controller 30x per second, even if the window isn't
visible. If you want to destroy the PID visualizer when the window is closed,
call pidvis_is_open to determine if the user has closed the window and call
pidvis_destroy to destroy the visualizer completely.