| 1 | #include "Vector3.h" |
| 2 | |
| 3 | #include <fastmath.h> |
| 4 | #include <cstddef> |
| 5 | |
| 6 | float Vector3::nan = NAN; |
| 7 | |
| 8 | Vector3::Vector3() |
| 9 | { |
| 10 | elem[0] = elem[1] = elem[2] = 0.0F; |
| 11 | } |
| 12 | |
| 13 | Vector3::Vector3(float a, float b, float c) |
| 14 | { |
| 15 | elem[0] = a; |
| 16 | elem[1] = b; |
| 17 | elem[2] = c; |
| 18 | } |
| 19 | |
| 20 | float& Vector3::operator[](int i) |
| 21 | { |
| 22 | if (i >= 0 && i <= 2) |
| 23 | return elem[i]; |
| 24 | return nan; |
| 25 | } |
| 26 | |
| 27 | Vector3 Vector3::cross(const Vector3 vec) |
| 28 | { |
| 29 | Vector3 out; |
| 30 | |
| 31 | out.elem[0] = elem[1] * vec.elem[2] - elem[2] * vec.elem[1]; |
| 32 | out.elem[1] = elem[2] * vec.elem[0] - elem[0] * vec.elem[2]; |
| 33 | out.elem[2] = elem[0] * vec.elem[1] - elem[1] * vec.elem[0]; |
| 34 | |
| 35 | return out; |
| 36 | } |
| 37 | |
| 38 | float Vector3::dot(const Vector3 vec) |
| 39 | { |
| 40 | return elem[0] * vec.elem[0] + |
| 41 | elem[1] * vec.elem[1] + |
| 42 | elem[2] * vec.elem[2]; |
| 43 | } |
| 44 | |
| 45 | float Vector3::magsq() |
| 46 | { |
| 47 | return powf(elem[0], 2) + |
| 48 | powf(elem[1], 2) + |
| 49 | powf(elem[2], 2); |
| 50 | } |
| 51 | |
| 52 | float Vector3::mag() |
| 53 | { |
| 54 | return sqrtf(magsq()); |
| 55 | } |
| 56 | |
| 57 | Vector3 Vector3::add(const Vector3 vec) |
| 58 | { |
| 59 | Vector3 out; |
| 60 | |
| 61 | out.elem[0] = elem[0] + vec.elem[0]; |
| 62 | out.elem[1] = elem[1] + vec.elem[1]; |
| 63 | out.elem[2] = elem[2] + vec.elem[2]; |
| 64 | |
| 65 | return out; |
| 66 | } |
| 67 | |
| 68 | Vector3 Vector3::sub(const Vector3 vec) |
| 69 | { |
| 70 | Vector3 out; |
| 71 | |
| 72 | out.elem[0] = elem[0] - vec.elem[0]; |
| 73 | out.elem[1] = elem[1] - vec.elem[1]; |
| 74 | out.elem[2] = elem[2] - vec.elem[2]; |
| 75 | |
| 76 | return out; |
| 77 | } |
| 78 | |
| 79 | Vector3 Vector3::mul(float scalar) |
| 80 | { |
| 81 | Vector3 out; |
| 82 | |
| 83 | out.elem[0] = elem[0] * scalar; |
| 84 | out.elem[1] = elem[1] * scalar; |
| 85 | out.elem[2] = elem[2] * scalar; |
| 86 | |
| 87 | return out; |
| 88 | } |
| 89 | |
| 90 | Vector3 Vector3::unit() |
| 91 | { |
| 92 | Vector3 out; |
| 93 | |
| 94 | float denom = mag(); |
| 95 | |
| 96 | out.elem[0] = elem[0] / denom; |
| 97 | out.elem[1] = elem[1] / denom; |
| 98 | out.elem[2] = elem[2] / denom; |
| 99 | |
| 100 | return out; |
| 101 | } |