function test3DVector()
{
$this->assertTrue(Math_VectorOp::isVector3($this->x) && $this->x->isValid());
}
/**
* Angle between vectors, using the equation: v . w = |v| |w| cos(theta)
*
* @access public
* @param object Math_Vector2 or MathVector3 (or subclass) $v1
* @param object Math_Vector2 or MathVector3 (or subclass) $v2
* @return mixed the angle between vectors (float, in radians) on success, a PEAR_Error object otherwise
*
* @see isVector2()
* @see isVector3()
* @see dotProduct()
*/
function angleBetween($v1, $v2)
{
if (Math_VectorOp::isVector2($v1) && Math_VectorOp::isVector2($v2) || Math_VectorOp::isVector3($v1) && Math_VectorOp::isVector3($v2)) {
$v1->normalize();
$v2->normalize();
return acos(Math_VectorOp::dotProduct($v1, $v2));
} else {
return PEAR::raiseError("Vectors must be both of the same type");
}
}
/**
* Angle between vectors, using the equation: v . w = |v| |w| cos(theta)
*
* @param object Math_Vector2 or MathVector3 (or subclass) $v1
* @param object Math_Vector2 or MathVector3 (or subclass) $v2
* @return mixed the angle between vectors (float, in radians) on success
* @throws InvalidArgumentException
*
* @see isVector2()
* @see isVector3()
* @see dotProduct()
*/
public static function angleBetween($v1, $v2)
{
if (Math_VectorOp::isVector2($v1) && Math_VectorOp::isVector2($v2) || Math_VectorOp::isVector3($v1) && Math_VectorOp::isVector3($v2)) {
$v1->normalize();
$v2->normalize();
return acos(Math_VectorOp::dotProduct($v1, $v2));
}
throw new InvalidArgumentException("Vectors must be both of the same type");
}
