1 | // vector3.h |
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2 | // |
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3 | // C++ class for 3-element vectors |
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4 | // |
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5 | // Copyright (C) 2000-2002, Mark R. Shinwell. |
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6 | // Copyright (C) 2002-2004,2005,2006,2015 Olly Betts |
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7 | // |
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8 | // This program is free software; you can redistribute it and/or modify |
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9 | // it under the terms of the GNU General Public License as published by |
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10 | // the Free Software Foundation; either version 2 of the License, or |
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11 | // (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 St, Fifth Floor, Boston, MA 02110-1301 USA |
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21 | // |
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22 | |
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23 | #ifndef Vector3_h |
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24 | #define Vector3_h |
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25 | |
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26 | #include <math.h> |
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27 | |
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28 | class Vector3 { |
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29 | protected: |
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30 | double x, y, z; |
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31 | |
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32 | public: |
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33 | Vector3() : x(0.0), y(0.0), z(0.0) { } |
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34 | Vector3(double a, double b, double c) : x(a), y(b), z(c) { } |
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35 | |
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36 | double GetX() const { return x; } |
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37 | double GetY() const { return y; } |
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38 | double GetZ() const { return z; } |
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39 | |
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40 | double magnitude() const { |
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41 | return sqrt(x*x + y*y + z*z); |
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42 | } |
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43 | |
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44 | // Returns a value in *radians*. |
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45 | double gradient() const { |
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46 | return atan2(z, sqrt(x*x + y*y)); |
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47 | } |
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48 | |
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49 | void normalise(); |
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50 | |
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51 | void assign(double a, double b, double c) { |
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52 | x = a; y = b; z = c; |
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53 | } |
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54 | |
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55 | void assign(const Vector3 &v) { |
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56 | *this = v; |
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57 | } |
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58 | |
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59 | friend Vector3 operator-(const Vector3& o) { |
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60 | return Vector3(-o.x, -o.y, -o.z); |
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61 | } |
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62 | Vector3& operator*=(double); |
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63 | Vector3& operator/=(double); |
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64 | Vector3& operator+=(const Vector3&); |
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65 | Vector3& operator-=(const Vector3&); |
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66 | Vector3& operator=(const Vector3& o) { |
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67 | x = o.x; y = o.y; z = o.z; |
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68 | return *this; |
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69 | } |
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70 | |
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71 | friend Vector3 operator*(double, const Vector3&); |
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72 | friend Vector3 operator*(const Vector3& v, double f) { |
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73 | return f * v; |
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74 | } |
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75 | friend Vector3 operator*(const Vector3&, const Vector3&); // cross product |
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76 | friend Vector3 operator+(const Vector3&, const Vector3&); |
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77 | friend Vector3 operator-(const Vector3&, const Vector3&); |
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78 | friend bool operator==(const Vector3&, const Vector3&); |
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79 | friend bool operator<(const Vector3&, const Vector3&); |
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80 | friend double dot(const Vector3&, const Vector3&); |
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81 | }; |
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82 | |
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83 | inline bool operator==(const Vector3& a, const Vector3& b) { |
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84 | return a.x == b.x && a.y == b.y && a.z == b.z; |
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85 | } |
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86 | |
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87 | // So we can use Vector3 as a key in a map... |
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88 | inline bool operator<(const Vector3& a, const Vector3& b) { |
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89 | if (a.x != b.x) return a.x < b.x; |
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90 | if (a.y != b.y) return a.y < b.y; |
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91 | return a.z < b.z; |
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92 | } |
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93 | |
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94 | #endif |
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