Refactoring math functions

Remove unused math header
Move math constants to own file
Remove unused math methods

src/blackmisc/math/constants.h

@@ -1,4 +1,4 @@
-/* Copyright (C) 2013
+/* Copyright (C) 2022
  * swift project Community / Contributors
  *
  * This file is part of swift project. It is subject to the license terms in the LICENSE file found in the top-level
@@ -8,14 +8,20 @@
 
 //! \file
 
-#ifndef BLACKMISC_MATH_MATH_H
+#ifndef BLACKMISC_MATH_CONSTANTS_H
-#define BLACKMISC_MATH_MATH_H
+#define BLACKMISC_MATH_CONSTANTS_H
 
-/*!
+namespace BlackMisc::Math
- * \namespace BlackMisc::Math
+{
- * \brief Math classes such as vectors, matrices, and utility methods.
+    //! PI
- */
+    constexpr double c_pi = 3.1415926535897932;
 
-#include "blackmisc/math/mathutils.h"
+    //! PI / 2
+    constexpr double c_pihalf = c_pi / 2;
+
+    //! PI * 2
+    constexpr double c_pi2 = c_pi * 2;
+
+} // ns
 
 #endif // guard

src/blackmisc/math/mathutils.cpp

@@ -6,6 +6,7 @@
  * or distributed except according to the terms contained in the LICENSE file.
  */
 
+#include "blackmisc/math/constants.h"
 #include "blackmisc/math/mathutils.h"
 #include "blackmisc/verify.h"
 
@@ -17,12 +18,6 @@
 
 namespace BlackMisc::Math
 {
-    double CMathUtils::cubicRootReal(double x)
-    {
-        const double result = std::pow(qAbs(x), 1.0 / 3.0);
-        return x < 0 ? -result : result;
-    }
-
     double CMathUtils::round(double value, int digits)
     {
         // gosh, is there no Qt method for this??? It's year 2013
@@ -35,11 +30,6 @@ namespace BlackMisc::Math
         return rv;
     }
 
-    QString CMathUtils::roundAsString(double value, int digits)
-    {
-        return QString::number(round(value, digits));
-    }
-
     double CMathUtils::roundEpsilon(double value, double epsilon)
     {
         if (epsilonZeroLimits(epsilon)) { return value; } // avoid division by 0
@@ -64,12 +54,12 @@ namespace BlackMisc::Math
 
     double CMathUtils::deg2rad(double degree)
     {
-        return degree * CMathUtils::PI() / 180.0;
+        return degree * c_pi / 180.0;
     }
 
     double CMathUtils::rad2deg(double radians)
     {
-        return radians * 180.0 / CMathUtils::PI();
+        return radians * 180.0 / c_pi;
     }
 
     double CMathUtils::normalizeDegrees180(double degrees)

src/blackmisc/math/mathutils.h

@@ -28,27 +28,9 @@ namespace BlackMisc::Math
         //! No objects, just static
         CMathUtils() = delete;
 
-        //! Calculates the square of x
-        static inline double square(double x)
-        {
-            return x * x;
-        }
-
-        //! Calculates x to the power of three
-        static inline double cubic(const double x)
-        {
-            return x * x * x;
-        }
-
-        //! Calculates the real cubic root
-        static double cubicRootReal(double x);
-
         //! Utility round method
         static double round(double value, int digits);
 
-        //! Utility round method, returning as string
-        static QString roundAsString(double value, int digits);
-
         //! Round by given epsilon
         static double roundEpsilon(double value, double epsilon);
 
@@ -79,27 +61,6 @@ namespace BlackMisc::Math
             return modf(value, &unused);
         }
 
-        //! PI / 2
-        static const double &PIHALF()
-        {
-            static double pi = 2.0 * qAtan(1.0);
-            return pi;
-        }
-
-        //! PI
-        static const double &PI()
-        {
-            static double pi = 4.0 * qAtan(1.0);
-            return pi;
-        }
-
-        //! PI * 2
-        static const double &PI2()
-        {
-            static double pi2 = 8.0 * qAtan(1.0);
-            return pi2;
-        }
-
         //! Degrees to radians
         static double deg2rad(double degree);
 

src/blackmisc/pq/angle.cpp

@@ -9,6 +9,7 @@
 #include "blackmisc/pq/angle.h"
 #include "blackmisc/iconlist.h"
 #include "blackmisc/icons.h"
+#include "blackmisc/math/constants.h"
 #include "blackmisc/math/mathutils.h"
 
 #include <cmath>
@@ -79,12 +80,12 @@ namespace BlackMisc::PhysicalQuantities
 
     double CAngle::piFactor() const
     {
-        return Math::CMathUtils::round(this->value(CAngleUnit::rad()) / CMathUtils::PI(), 6);
+        return Math::CMathUtils::round(this->value(CAngleUnit::rad()) / c_pi, 6);
     }
 
     const double &CAngle::PI()
     {
-        return CMathUtils::PI();
+        return c_pi;
     }
 
     double CAngle::sin() const