annotate src/gmath/vector.cc @ 4:d30e24132b6e
more gmath
| author |
John Tsiombikas <nuclear@member.fsf.org> |
| date |
Sat, 25 Jul 2015 07:42:30 +0300 |
| parents |
d71b4e899e08 |
| children |
2ce58d5309f0 |
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line source |
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1 #include "vector.h"
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2 #include "matrix.h"
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3
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4 namespace gph {
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5
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6 Vector3::Vector3(const Vector4 &v)
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7 : x(v.x), y(v.y), z(v.z)
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8 {
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9 }
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10
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11 Vector3 operator *(const Vector3 &v, const Matrix4x4 &m)
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12 {
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13 float x = v.x * m[0][0] + v.y * m[1][0] + v.z * m[2][0] + m[3][0];
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14 float y = v.x * m[0][1] + v.y * m[1][1] + v.z * m[2][1] + m[3][1];
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15 float z = v.x * m[0][2] + v.y * m[1][2] + v.z * m[2][2] + m[3][2];
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16 return Vector3(x, y, z);
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17 }
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18
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19 Vector3 operator *(const Matrix4x4 &m, const Vector3 &v)
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20 {
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21 float x = m[0][0] * v.x + m[0][1] * v.y + m[0][2] * v.z + m[0][3];
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22 float y = m[1][0] * v.x + m[1][1] * v.y + m[1][2] * v.z + m[1][3];
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23 float z = m[2][0] * v.x + m[2][1] * v.y + m[2][2] * v.z + m[2][3];
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24 return Vector3(x, y, z);
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25 }
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26
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27 Vector4::Vector4(const Vector3 &v)
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28 : x(v.x), y(v.y), z(v.z), w(1.0f)
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29 {
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30 }
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31
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32 } // namespace gph
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