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| 2189 | - | 1 | /// -*- tab-width: 4; Mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*- |
| 2 | /* |
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| 3 | * vector3.cpp |
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| 4 | * Copyright (C) Andrew Tridgell 2012 |
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| 5 | * |
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| 6 | * This file is free software: you can redistribute it and/or modify it |
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| 7 | * under the terms of the GNU General Public License as published by the |
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| 8 | * Free Software Foundation, either version 3 of the License, or |
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| 9 | * (at your option) any later version. |
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| 10 | * |
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| 11 | * This file is distributed in the hope that it will be useful, but |
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| 12 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
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| 14 | * See the GNU General Public License for more details. |
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| 15 | * |
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| 16 | * You should have received a copy of the GNU General Public License along |
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| 17 | * with this program. If not, see <http://www.gnu.org/licenses/>. |
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| 18 | */ |
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| 19 | |||
| 20 | #include "AP_Math.h" |
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| 21 | |||
| 22 | #define HALF_SQRT_2 0.70710678118654757 |
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| 23 | |||
| 24 | // rotate a vector by a standard rotation, attempting |
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| 25 | // to use the minimum number of floating point operations |
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| 26 | template <typename T> |
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| 27 | void Vector3<T>::rotate(enum Rotation rotation) |
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| 28 | { |
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| 29 | T tmp; |
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| 30 | switch (rotation) { |
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| 31 | case ROTATION_NONE: |
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| 32 | case ROTATION_MAX: |
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| 33 | return; |
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| 34 | case ROTATION_YAW_45: { |
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| 35 | tmp = HALF_SQRT_2*(x - y); |
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| 36 | y = HALF_SQRT_2*(x + y); |
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| 37 | x = tmp; |
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| 38 | return; |
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| 39 | } |
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| 40 | case ROTATION_YAW_90: { |
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| 41 | tmp = x; x = -y; y = tmp; |
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| 42 | return; |
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| 43 | } |
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| 44 | case ROTATION_YAW_135: { |
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| 45 | tmp = -HALF_SQRT_2*(x + y); |
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| 46 | y = HALF_SQRT_2*(x - y); |
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| 47 | x = tmp; |
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| 48 | return; |
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| 49 | } |
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| 50 | case ROTATION_YAW_180: |
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| 51 | x = -x; y = -y; |
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| 52 | return; |
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| 53 | case ROTATION_YAW_225: { |
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| 54 | tmp = HALF_SQRT_2*(y - x); |
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| 55 | y = -HALF_SQRT_2*(x + y); |
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| 56 | x = tmp; |
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| 57 | return; |
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| 58 | } |
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| 59 | case ROTATION_YAW_270: { |
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| 60 | tmp = x; x = y; y = -tmp; |
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| 61 | return; |
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| 62 | } |
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| 63 | case ROTATION_YAW_315: { |
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| 64 | tmp = HALF_SQRT_2*(x + y); |
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| 65 | y = HALF_SQRT_2*(y - x); |
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| 66 | x = tmp; |
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| 67 | return; |
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| 68 | } |
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| 69 | case ROTATION_ROLL_180: { |
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| 70 | y = -y; z = -z; |
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| 71 | return; |
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| 72 | } |
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| 73 | case ROTATION_ROLL_180_YAW_45: { |
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| 74 | tmp = HALF_SQRT_2*(x + y); |
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| 75 | y = HALF_SQRT_2*(x - y); |
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| 76 | x = tmp; z = -z; |
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| 77 | return; |
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| 78 | } |
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| 79 | case ROTATION_ROLL_180_YAW_90: { |
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| 80 | tmp = x; x = y; y = tmp; z = -z; |
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| 81 | return; |
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| 82 | } |
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| 83 | case ROTATION_ROLL_180_YAW_135: { |
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| 84 | tmp = HALF_SQRT_2*(y - x); |
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| 85 | y = HALF_SQRT_2*(y + x); |
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| 86 | x = tmp; z = -z; |
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| 87 | return; |
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| 88 | } |
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| 89 | case ROTATION_PITCH_180: { |
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| 90 | x = -x; z = -z; |
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| 91 | return; |
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| 92 | } |
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| 93 | case ROTATION_ROLL_180_YAW_225: { |
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| 94 | tmp = -HALF_SQRT_2*(x + y); |
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| 95 | y = HALF_SQRT_2*(y - x); |
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| 96 | x = tmp; z = -z; |
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| 97 | return; |
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| 98 | } |
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| 99 | case ROTATION_ROLL_180_YAW_270: { |
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| 100 | tmp = x; x = -y; y = -tmp; z = -z; |
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| 101 | return; |
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| 102 | } |
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| 103 | case ROTATION_ROLL_180_YAW_315: { |
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| 104 | tmp = HALF_SQRT_2*(x - y); |
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| 105 | y = -HALF_SQRT_2*(x + y); |
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| 106 | x = tmp; z = -z; |
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| 107 | return; |
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| 108 | } |
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| 109 | } |
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| 110 | } |
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| 111 | |||
| 112 | // only define for signed numbers |
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| 113 | template void Vector3<float>::rotate(enum Rotation); |
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| 114 | template void Vector3<int16_t>::rotate(enum Rotation); |
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| 115 | template void Vector3<int32_t>::rotate(enum Rotation); |