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Another small cleanup after !490

This commit is contained in:
Mikolaj Wielgus 2021-12-29 17:40:35 +01:00
parent e3fb9f77eb
commit 906eee68a5
1 changed files with 5 additions and 5 deletions
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10
eeschema/widgets/tuner_slider.cpp
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@ -72,7 +72,7 @@ static inline int arraysize( const T ( &v )[S] ) { return S; }
* | 0.50 | 0.50 | 0B | (ideal) linear
* | ^ | 0.15 | 4B | symmetric (audio S-curve)
* | ^ | 0.10 | 5B | symmetric (S-curve)
* | ^ | 0.00 | — | switch
* | ^ | 0.00 | - | switch
*
* Standards code letters cross-reference:
*
@ -80,9 +80,9 @@ static inline int arraysize( const T ( &v )[S] ) { return S; }
* | ----------------: | :--------------: | :------: | :-------------
* | 0B | A | A | linear
* | 10A | B | C | logarithmic
* | 15A | ^ | — | ^
* | 15A | ^ | - | ^
* | 10C | C | F | reverse logarithmic
* | 15C | ^ | — | ^
* | 15C | ^ | - | ^
*
* **Logarithmic Law** is for *levels* (logarithmic units) and is actually an exponential curve.
* **Reverse** refers to a reverse-mounted resistive element or shaft on a potentiometer
@ -140,8 +140,8 @@ static F taper( F aRatio, F aMid = 0.5, F aLaw = 1.0, bool aInverse = false )
F c = a - 1;
// scaling: a = (1 - 1/m)^2
// log law: (a' - 1) / (a - 1)
// inverse: log[a](1 + t (a - 1))
// log law: (a^t - 1) / (a - 1)
// inverse: log_a(1 + t (a - 1))
t = aInverse ? ( std::log1p( t * c ) / b ) : ( std::expm1( t * b ) / c );
}