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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#ifndef MATH_UTILS_H
#define MATH_UTILS_H
#include "common/scummsys.h"
#ifndef FLT_MIN
#define FLT_MIN 1E-37f
#endif
#ifndef FLT_MAX
#define FLT_MAX 1E+37f
#endif
namespace Math {
/** A complex number. */
struct Complex {
float re, im;
};
/* Math::epsilon is a constant with a small value which is used for comparing
* floating point numbers.
*
* The value is based on the previous hard-coded numbers in
* Line2d.cpp. Smaller numbers could be used unless they are
* smaller than the float granularity.
*/
static const float epsilon = 0.0001f;
// Round a number towards zero
// Input and Output type can be different
template<class InputT, class OutputT>
inline OutputT trunc(InputT x) {
return (x > 0) ? floor(x) : ceil(x);
}
// Round a number towards zero
// Input and Output type are the same
template<class T>
inline T trunc(T x) {
return trunc<T,T>(x);
}
// Convert radians to degrees
// Input and Output type can be different
// Upconvert everything to floats
template<class InputT, class OutputT>
inline OutputT rad2deg(InputT rad) {
return (OutputT)( (float)rad * (float)57.2957795130823); // 180.0/M_PI = 57.2957795130823
}
// Handle the case differently when the input type is double
template<class OutputT>
inline OutputT rad2deg(double rad) {
return (OutputT)( rad * 57.2957795130823);
}
// Convert radians to degrees
// Input and Output type are the same
template<class T>
inline T rad2deg(T rad) {
return rad2deg<T,T>(rad);
}
// Convert degrees to radians
// Input and Output type can be different
// Upconvert everything to floats
template<class InputT, class OutputT>
inline OutputT deg2rad(InputT deg) {
return (OutputT)( (float)deg * (float)0.0174532925199433); // M_PI/180.0 = 0.0174532925199433
}
// Handle the case differently when the input type is double
template<class OutputT>
inline OutputT deg2rad(double deg) {
return (OutputT)( deg * 0.0174532925199433);
}
// Convert degrees to radians
// Input and Output type are the same
template<class T>
inline T deg2rad(T deg) {
return deg2rad<T,T>(deg);
}
template<class T>
inline T hypotenuse(T xv, T yv) {
return (T)sqrt((double)(xv * xv + yv * yv));
}
inline float square(float x) {
return x * x;
}
}
#endif
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