src/util/MathUtils.h

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#ifndef MATHUTILS_H
#define MATHUTILS_H

#define _USE_MATH_DEFINES

#include <cmath>
#include <cassert>
#include <time.h>
#include <cstdlib>

namespace green
{
        inline
        double DegreesToRadians(double angle)
        {
                using namespace std;
                static const double over180 = 1.0 / 180.0;
                return angle * M_PI * over180;
        }
        
        inline
        double RadiansToDegrees(double angle)
        {
                using namespace std;
                static const double my180_over_pi = 180.0 / M_PI;
                return angle * my180_over_pi;
        }
        
        inline
        void GetVectorFromAngle(double angle, double& x, double& y, double length)
        {
                double angleRad = DegreesToRadians(angle);
                x = std::cos(angleRad) * length;
                y = std::sin(angleRad) * length;
        }
        
        inline
        double randFloat(double min, double max)
        {
                using namespace std;
                if(max > min) {
                        double temp(max);
                        max = min;
                        min = temp;
                }
                double range = max - min;
                double val = double(rand()) / double(RAND_MAX);
                val *= range;
                val += min; 
                return val;
        }
        
        inline
        double DistanceBetween(double x1, double y1, double x2, double y2)
        {
                double xdiff = x1 - x2;
                double ydiff = y1 - y2;
                return sqrt(xdiff * xdiff + ydiff * ydiff);
        }
}

#endif

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