trackbar is really a nice feature, but I am not happy with 3 things
no zoom in. yes I can change the whole window as large as the screen, but it's still not in full resolution.
bar parameters always start from 0. it's an invalid value for some of my parameters
bar parameters are set to be continuous integers. so I have to modify the function parameters like p/100.0 or 2*p+1.
I will really appreciate if anyone can share some thoughts of better solutions.