> I did it, but I am confuse on speed... 1/24 means
> 24 fps. But when I try to increase the frame per
> sec speed, I do not see any difference, I try 1/100
> fps, it just gives me a very minor effect.
> How can I increase the animation speed or fps?


I'm guessing you are on a WIN32 platform then? 

The stock WIN32 timers that fltk uses are heavily quantised (typically approx. 15 to 16ms in Win7, for example) so that means code producing animation using these timers tends to tick at quite distinct rates. 
Up to about 20 FPS it works pretty well, but if you ask for faster than that you tend to get either 30 FPS, 41 FPS or 62 FPS, and then nothing faster...

You can use Fl::add_idle() to implement an idle function, or use fltk's glut emulation layer (accessed via FL/glut.H, see docs...) to access a fltk-compatible implementations of glutIdleFunc() and other glut functions.


> In fact, I did pretty much work with glut functions
> in fltk. But the problem with glut is I can't create
> a c++ class with these function. These function doesn't
> provide this facility? Am I right?

Check the docs on using fltk's glut emulation layer in FL/glut.H as noted above.



> So, thats why, now I am moving to Fl_Gl_Window class.
> It is working well, the only and very important issue
> I am facing is, real-time Idle function speed.
> How can I increase the speed of real-time updating?

If you use the WIN32 timers it can be heavily quatised, as noted above. I have a test code I run, which on Linux and OSX scales the FPS pretty smoothly from 10 FPS to about 500 FPS.

The same code running on WIN32 scales up to about 62 FPS then will go no faster. 

If I replace the Fl::add_timeout() with an Fl::add_idle(), it then runs about 500 FPS or more, like the Linux and OSX versions...





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