[1505] | 1 | /* |
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| 2 | * ORXONOX - the hottest 3D action shooter ever to exist |
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| 3 | * > www.orxonox.net < |
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| 4 | * |
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| 5 | * |
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| 6 | * License notice: |
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| 7 | * |
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| 8 | * This program is free software; you can redistribute it and/or |
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| 9 | * modify it under the terms of the GNU General Public License |
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| 10 | * as published by the Free Software Foundation; either version 2 |
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| 11 | * of the License, or (at your option) any later version. |
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| 12 | * |
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| 13 | * This program is distributed in the hope that it will be useful, |
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| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 16 | * GNU General Public License for more details. |
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| 17 | * |
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| 18 | * You should have received a copy of the GNU General Public License |
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| 19 | * along with this program; if not, write to the Free Software |
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| 20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
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| 21 | * |
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| 22 | * Author: |
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| 23 | * Fabian 'x3n' Landau |
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| 24 | * Co-authors: |
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[9939] | 25 | * Wolfgang Roenninger |
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[1505] | 26 | * |
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| 27 | */ |
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| 28 | |
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[1791] | 29 | /** |
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[7401] | 30 | @defgroup Math Mathematical functions |
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| 31 | @ingroup Util |
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| 32 | */ |
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| 33 | |
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| 34 | /** |
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[2171] | 35 | @file |
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[7401] | 36 | @ingroup Math |
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[1791] | 37 | @brief Declaration and implementation of several math-functions, typedefs of some Ogre::Math classes to the orxonox namespace. |
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| 38 | */ |
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| 39 | |
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[1505] | 40 | #ifndef _Util_Math_H__ |
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| 41 | #define _Util_Math_H__ |
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| 42 | |
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| 43 | #include "UtilPrereqs.h" |
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| 44 | |
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[1625] | 45 | #include <string> |
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[2171] | 46 | #include <cmath> |
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[7427] | 47 | #include <cstdlib> |
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[1505] | 48 | |
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| 49 | #include <OgreMath.h> |
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| 50 | #include <OgreVector2.h> |
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| 51 | #include <OgreVector3.h> |
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| 52 | #include <OgreVector4.h> |
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| 53 | #include <OgreQuaternion.h> |
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| 54 | #include <OgreColourValue.h> |
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| 55 | |
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[3214] | 56 | // Certain headers might define unwanted macros... |
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| 57 | #undef max |
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| 58 | #undef min |
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| 59 | #undef sgn |
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| 60 | #undef clamp |
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| 61 | #undef sqrt |
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| 62 | #undef square |
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| 63 | #undef mod |
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| 64 | #undef rnd |
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[1781] | 65 | |
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[2171] | 66 | namespace orxonox |
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[1505] | 67 | { |
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[8351] | 68 | /** Often used numerical constants because C++ doesn't define any. |
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| 69 | @note |
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| 70 | The values here are decimal representations of the approximate floating |
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| 71 | point value as it is stored according to the IEEE 754 standard. |
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| 72 | */ |
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[7184] | 73 | namespace math |
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| 74 | { |
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[8351] | 75 | const float twoPi = 6.283185482025146484375f; ///< PI * 2 |
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| 76 | const float pi = 3.1415927410125732421875f; ///< PI |
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| 77 | const float pi_2 = 1.57079637050628662109375f; ///< PI / 2 |
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| 78 | const float pi_4 = 0.785398185253143310546875f; ///< PI / 4 |
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| 79 | const float e = 2.718281269073486328125f; ///< e |
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| 80 | const float sqrt2 = 1.41421353816986083984375f; ///< sqrt(2) |
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| 81 | const float sqrt2_2 = 0.707106769084930419921875f; ///< sqrt(2) / 2 |
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[7184] | 82 | } |
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| 83 | |
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[6417] | 84 | #if OGRE_VERSION < 0x010603 |
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[2171] | 85 | _UtilExport std::ostream& operator<<(std::ostream& out, const orxonox::Radian& radian); |
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[6417] | 86 | _UtilExport std::ostream& operator<<(std::ostream& out, const orxonox::Degree& degree); |
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| 87 | #endif |
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[2171] | 88 | _UtilExport std::istream& operator>>(std::istream& in, orxonox::Radian& radian); |
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| 89 | _UtilExport std::istream& operator>>(std::istream& in, orxonox::Degree& degree); |
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[1505] | 90 | |
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[2171] | 91 | _UtilExport float getAngle(const orxonox::Vector3& myposition, const orxonox::Vector3& mydirection, const orxonox::Vector3& otherposition); |
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| 92 | _UtilExport orxonox::Vector2 get2DViewdirection(const orxonox::Vector3& myposition, const orxonox::Vector3& mydirection, const orxonox::Vector3& myorthonormal, const orxonox::Vector3& otherposition); |
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[11052] | 93 | _UtilExport orxonox::Vector2 get2DViewCoordinates(const orxonox::Vector3& myposition, const orxonox::Vector3& mydirection, const orxonox::Vector3& myorthonormal, const orxonox::Vector3& otherposition); |
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[9939] | 94 | _UtilExport orxonox::Vector2 get3DProjection(const orxonox::Vector3& myposition, const orxonox::Vector3& mydirection, const orxonox::Vector3& myorthonormal, const orxonox::Vector3& otherposition, const float mapangle, const float detectionlimit); |
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| 95 | _UtilExport bool isObjectHigherThanShipOnMap(const orxonox::Vector3& myposition, const orxonox::Vector3& mydirection, const orxonox::Vector3& myorthonormal, const orxonox::Vector3& otherposition, const float mapangle); |
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| 96 | _UtilExport int determineMap3DZOrder(const orxonox::Vector3& myposition, const orxonox::Vector3& mydirection, const orxonox::Vector3& myorthonormal, const orxonox::Vector3& otherposition, const float detectionlimit); |
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| 97 | _UtilExport orxonox::Vector3 getTransformedVector(const orxonox::Vector3& distance, const orxonox::Vector3& mydirection, const orxonox::Vector3& myorthonormal, const orxonox::Vector3& myside); |
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[2171] | 98 | _UtilExport orxonox::Vector3 getPredictedPosition(const orxonox::Vector3& myposition, float projectilespeed, const orxonox::Vector3& targetposition, const orxonox::Vector3& targetvelocity); |
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[1505] | 99 | |
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[2171] | 100 | /** |
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| 101 | @brief Returns the sign of the given value. |
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| 102 | @param x The value |
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| 103 | @return 1 if the value is positive or zero, -1 if the value is negative |
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| 104 | */ |
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| 105 | template <typename T> |
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| 106 | inline T sgn(T x) |
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| 107 | { |
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[6502] | 108 | return (x >= 0) ? (T)1 : (T)-1; |
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[2171] | 109 | } |
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[1505] | 110 | |
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[2171] | 111 | /** |
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[7401] | 112 | @brief Keeps a value between a lower and an upper limit. Values beyond these limits are limited to either @a min or @a max. |
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[2171] | 113 | @param x The value |
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| 114 | @param min The lower limit |
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| 115 | @param max The upper limit |
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| 116 | */ |
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| 117 | template <typename T> |
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| 118 | inline T clamp(T x, T min, T max) |
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| 119 | { |
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| 120 | if (x < min) |
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| 121 | return min; |
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[1505] | 122 | |
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[2171] | 123 | if (x > max) |
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| 124 | return max; |
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[1505] | 125 | |
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[2171] | 126 | return x; |
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| 127 | } |
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[1505] | 128 | |
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[2171] | 129 | /** |
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[7401] | 130 | @brief Returns the squared value (x^2). |
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[2171] | 131 | */ |
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| 132 | template <typename T> |
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| 133 | inline T square(T x) |
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| 134 | { |
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| 135 | return x*x; |
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| 136 | } |
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[1505] | 137 | |
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[2171] | 138 | /** |
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[7401] | 139 | @brief Returns the cubed value (x^3). |
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[2171] | 140 | */ |
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| 141 | template <typename T> |
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| 142 | inline T cube(T x) |
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| 143 | { |
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| 144 | return x*x*x; |
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| 145 | } |
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[1505] | 146 | |
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[2171] | 147 | /** |
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| 148 | @brief The modulo operation, enhanced to work properly with negative values. |
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| 149 | @param x The value |
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| 150 | @param max The operand |
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[7401] | 151 | |
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| 152 | The built in modulo operator % yields a strange behavior with negative values. |
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| 153 | This function corrects this - the result is guaranteed to lie always between |
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| 154 | zero and (max-1). |
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| 155 | |
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| 156 | Example: |
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| 157 | @code |
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| 158 | int var = 11 % 10; // 1 |
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| 159 | int var = -1 % 10; // -1 |
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| 160 | |
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| 161 | int var = mod(11, 10); // 1 |
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| 162 | int var = mod(-1, 10); // 9 |
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| 163 | @endcode |
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[2171] | 164 | */ |
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| 165 | template <typename T> |
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| 166 | inline int mod(T x, int max) |
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| 167 | { |
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| 168 | if (x >= 0) |
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| 169 | return (x % max); |
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| 170 | else |
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[8706] | 171 | { |
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| 172 | T temp = x % max; |
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| 173 | return (temp < 0) ? (temp + max) : temp; |
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| 174 | } |
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[2171] | 175 | } |
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[2087] | 176 | |
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[7401] | 177 | /** |
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| 178 | @brief Returns a "zero" value for the given type. |
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| 179 | @note This is the default template of the zeroise() function. The template is spezialized for each supported type. |
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| 180 | |
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| 181 | The exact return value of the function depends on the type. For @c int this is 0, |
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| 182 | for @c float it's 0.0f. For a @c std::string the function returns "" and for |
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| 183 | @c Vector3 you get <tt>Vector3(0, 0, 0)</tt>. |
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| 184 | */ |
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[2171] | 185 | template <typename T> |
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| 186 | inline T zeroise() |
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| 187 | { |
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[2662] | 188 | // Default, raise a compiler error without including large boost header cascade. |
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| 189 | T temp(); |
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| 190 | *********temp; // If you reach this code, you abused zeroise()! |
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| 191 | return temp; |
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[2171] | 192 | } |
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[2087] | 193 | |
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[2171] | 194 | template <> inline char zeroise<char>() { return 0; } |
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| 195 | template <> inline unsigned char zeroise<unsigned char>() { return 0; } |
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| 196 | template <> inline short zeroise<short>() { return 0; } |
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| 197 | template <> inline unsigned short zeroise<unsigned short>() { return 0; } |
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| 198 | template <> inline int zeroise<int>() { return 0; } |
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| 199 | template <> inline unsigned int zeroise<unsigned int>() { return 0; } |
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| 200 | template <> inline long zeroise<long>() { return 0; } |
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| 201 | template <> inline unsigned long zeroise<unsigned long>() { return 0; } |
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| 202 | template <> inline long long zeroise<long long>() { return 0; } |
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| 203 | template <> inline unsigned long long zeroise<unsigned long long>() { return 0; } |
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| 204 | template <> inline float zeroise<float>() { return 0; } |
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| 205 | template <> inline double zeroise<double>() { return 0; } |
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| 206 | template <> inline long double zeroise<long double>() { return 0; } |
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| 207 | template <> inline bool zeroise<bool>() { return 0; } |
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| 208 | template <> inline void* zeroise<void*>() { return 0; } |
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[6417] | 209 | template <> inline std::string zeroise<std::string>() { return std::string(); } |
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[2171] | 210 | template <> inline orxonox::Radian zeroise<orxonox::Radian>() { return orxonox::Radian(0.0f); } |
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| 211 | template <> inline orxonox::Degree zeroise<orxonox::Degree>() { return orxonox::Degree(0.0f); } |
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| 212 | template <> inline orxonox::Vector2 zeroise<orxonox::Vector2>() { return orxonox::Vector2 (0, 0) ; } |
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| 213 | template <> inline orxonox::Vector3 zeroise<orxonox::Vector3>() { return orxonox::Vector3 (0, 0, 0) ; } |
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| 214 | template <> inline orxonox::Vector4 zeroise<orxonox::Vector4>() { return orxonox::Vector4 (0, 0, 0, 0); } |
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| 215 | template <> inline orxonox::ColourValue zeroise<orxonox::ColourValue>() { return orxonox::ColourValue(0, 0, 0, 0); } |
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| 216 | template <> inline orxonox::Quaternion zeroise<orxonox::Quaternion>() { return orxonox::Quaternion (0, 0, 0, 0); } |
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[1505] | 217 | |
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[7401] | 218 | /** |
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| 219 | @brief Provides zero value symbols that can be returned as reference |
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| 220 | @see zeroise() |
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| 221 | */ |
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[3196] | 222 | template <typename T> |
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| 223 | struct NilValue |
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| 224 | { |
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| 225 | inline operator const T&() const |
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| 226 | { |
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| 227 | return value; |
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| 228 | } |
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| 229 | static T value; |
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| 230 | }; |
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| 231 | template <typename T> |
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| 232 | T NilValue<T>::value = zeroise<T>(); |
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| 233 | |
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[2171] | 234 | /** |
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| 235 | @brief Interpolates between two values for a time between 0 and 1. |
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[7401] | 236 | @param time The time is a value between 0 and 1 - the function returns @a start if @a time is 0, @a end if @a time is 1, and interpolates if @a time is between 0 and 1. |
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| 237 | @param start The value at @a time = 0 |
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| 238 | @param end The value at @a time = 1 |
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| 239 | @return The interpolated value at a given time |
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[2171] | 240 | */ |
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| 241 | template <typename T> |
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[3196] | 242 | inline T interpolate(float time, const T& start, const T& end) |
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[2171] | 243 | { |
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[9550] | 244 | return static_cast<T>(time * (end - start) + start); |
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[2171] | 245 | } |
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[1505] | 246 | |
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[2171] | 247 | /** |
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| 248 | @brief Interpolates smoothly between two values for a time between 0 and 1. The function starts slowly, increases faster and stops slowly again. |
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[7401] | 249 | @param time The time is a value between 0 and 1 - the function returns @a start if @a time is 0, @a end if @a time is 1, and interpolates if @a time is between 0 and 1. |
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| 250 | @param start The value at @a time = 0 |
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| 251 | @param end The value at @a time = 1 |
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| 252 | @return The interpolated value at a given time |
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[2171] | 253 | */ |
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| 254 | template <typename T> |
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[3196] | 255 | inline T interpolateSmooth(float time, const T& start, const T& end) |
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[2171] | 256 | { |
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[9550] | 257 | return static_cast<T>((-2 * (end - start) * cube(time)) + (3 * (end - start) * square(time)) + start); |
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[2171] | 258 | } |
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[1505] | 259 | |
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[2171] | 260 | /** |
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[7401] | 261 | @brief Returns a random number between 0 and almost 1: <tt>0 <= rnd < 1</tt>. |
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[2171] | 262 | */ |
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| 263 | inline float rnd() |
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| 264 | { |
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[3196] | 265 | return rand() / (RAND_MAX + 1.0f); |
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[2171] | 266 | } |
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[1505] | 267 | |
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[2171] | 268 | /** |
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[7401] | 269 | @brief Returns a random number between 0 and almost @a max: <tt>0 <= rnd < max</tt>. |
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[2171] | 270 | @param max The maximum |
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| 271 | */ |
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| 272 | inline float rnd(float max) |
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| 273 | { |
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| 274 | return rnd() * max; |
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| 275 | } |
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[1505] | 276 | |
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[2171] | 277 | /** |
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[7401] | 278 | @brief Returns a random number between @a min and almost @a max: <tt>min <= rnd < max</tt>. |
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[2171] | 279 | @param min The minimum |
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| 280 | @param max The maximum |
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| 281 | */ |
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| 282 | inline float rnd(float min, float max) |
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| 283 | { |
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| 284 | return rnd(max - min) + min; |
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| 285 | } |
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[1625] | 286 | |
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[2872] | 287 | /** |
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| 288 | @brief Returns randomly 1 or -1 with equal probability. |
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| 289 | */ |
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| 290 | inline float rndsgn() |
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| 291 | { |
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[3196] | 292 | return static_cast<float>((rand() & 0x2) - 1); // rand() & 0x2 is either 2 or 0 |
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[2872] | 293 | } |
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| 294 | |
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[2171] | 295 | _UtilExport unsigned long getUniqueNumber(); |
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| 296 | } |
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| 297 | |
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[1505] | 298 | #endif /* _Util_Math_H__ */ |
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