#+TITLE: Scale
* Overview
=scale= provides some helpful scaling functions. Scaling
refers to taking a value in some range, and then protionally
refitting it to be in another range. In other words...
scaling!
* Tangled files
=scale.h= and =scale.c=

#+NAME: scale.h
#+BEGIN_SRC c :tangle scale.h
#ifndef SK_SCALE_H
#define SK_SCALE_H
#ifndef SKFLT
#define SKFLT float
#endif
<<funcdefs>>
#endif
#+END_SRC

#+NAME: scale.c
#+BEGIN_SRC c :tangle scale.c
#include "scale.h"
<<funcs>>
#+END_SRC
* Scale
The function =sk_scale= takes in a value between 0 and 1,
an returns a value to be in between =min= and =max=.

#+NAME: funcdefs
#+BEGIN_SRC c
SKFLT sk_scale(SKFLT in, SKFLT min, SKFLT max);
#+END_SRC

#+NAME: funcs
#+BEGIN_SRC c
SKFLT sk_scale(SKFLT in, SKFLT min, SKFLT max)
{

    return in * (max - min) + min;
}
#+END_SRC
* Biscale
The function =sk_biscale= takes a value between -1 and
1 and returns a value between =min= and =max=.

#+NAME: funcdefs
#+BEGIN_SRC c
SKFLT sk_biscale(SKFLT in, SKFLT min, SKFLT max);
#+END_SRC

#+NAME: funcs
#+BEGIN_SRC c
SKFLT sk_biscale(SKFLT in, SKFLT min, SKFLT max)
{
    return min + (in + 1.0) * 0.5 * (max - min);
}
#+END_SRC