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added cross- and dot-products to util/Vector

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git-svn-id: svn://anubis/gvsu@358 45c1a28c-8058-47b2-ae61-ca45b979098e
This commit is contained in:
josh 2009-01-16 18:14:01 +00:00
parent cba45f29a2
commit 1d26118e32
2 changed files with 18 additions and 0 deletions
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16
cs658/final/util/Vector.cc
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@ -14,3 +14,19 @@ std::ostream & operator<<(std::ostream & out, const Vector & v)
out << "[" << v[0] << ", " << v[1] << ", " << v[2] << "]"; out << "[" << v[0] << ", " << v[1] << ", " << v[2] << "]";
return out; return out;
} }
/* Compute the dot-product of two vectors */
double operator%(const Vector & v1, const Vector & v2)
{
return v1[0] * v2[0] + v1[1] * v2[1] + v1[2] * v2[2];
}
/* Compute the cross-product of two vectors */
Vector operator*(const Vector & v1, const Vector & v2)
{
Vector result;
result[0] = v1[1] * v2[2] - v1[2] * v2[1];
result[1] = v1[2] * v2[0] - v1[0] * v2[2];
result[2] = v1[0] * v2[1] - v1[1] * v2[0];
return result;
}

2
cs658/final/util/Vector.h
View File

@ -12,6 +12,8 @@ class Vector
double & operator[](int idx) { return m_array[idx]; } double & operator[](int idx) { return m_array[idx]; }
double operator[](int idx) const { return m_array[idx]; } double operator[](int idx) const { return m_array[idx]; }
friend std::ostream & operator<<(std::ostream & out, const Vector & v); friend std::ostream & operator<<(std::ostream & out, const Vector & v);
friend double operator%(const Vector & v1, const Vector & v2);
friend Vector operator*(const Vector & v1, const Vector & v2);
private: private:
double m_array[3]; double m_array[3];