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Add is_null_vector() function

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hasufell 2014-05-13 20:09:32 +02:00
parent e4bad92195
commit 33408e5e46
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2 changed files with 22 additions and 0 deletions
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21
src/vector.c
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@ -184,3 +184,24 @@ bool set_null_vector(vector *a)
return true;
}
/**
* Check if vector a is a null vector,
* so all coordinates are 0.
*
* @param a vector
* @return true if vector is a null vector, false
* otherwise, -1 on failure
*/
int is_null_vector(vector *a)
{
if (!a)
return -1;
if (a->x == 0 &&
a->y == 0 &&
a->z == 0)
return true;
else
return false;
}

1
src/vector.h
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@ -123,6 +123,7 @@ bool sub_vectors(vector *a, vector *b, vector *c);
bool normalize_vector(vector *a, vector *b);
bool copy_vector(vector *a, vector *b);
bool set_null_vector(vector *a);
int is_null_vector(vector *a);
#endif /* _DROW_ENGINE_VEC_MATH_H */