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/*
* The Mana Client
* Copyright (C) 2007-2009 The Mana World Development Team
* Copyright (C) 2009-2012 The Mana Developers
*
* This file is part of The Mana Client.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef VECTOR_H
#define VECTOR_H
#include <cmath>
#include <iostream>
/**
* Vector class. Represents either a 3D point in space, a velocity or a force.
* Provides several convenient operator overloads.
*/
class Vector
{
public:
Vector() = default;
Vector(float x, float y, float z = 0.0f):
x(x),
y(y),
z(z)
{}
/**
* Returns true if all coordinates are set to 0, otherwise returns
* false.
*/
bool isNull() const
{
return x == 0.0f && y == 0.0f && z == 0.0f;
}
/**
* Scale vector operator.
*/
Vector operator*(float c) const
{
return Vector(x * c,
y * c,
z * c);
}
/**
* In-place scale vector operator.
*/
Vector &operator*=(float c)
{
x *= c;
y *= c;
z *= c;
return *this;
}
/**
* Scale vector operator.
*/
Vector operator/(float c) const
{
return Vector(x / c,
y / c,
z / c);
}
/**
* In-place scale vector operator.
*/
Vector &operator/=(float c)
{
x /= c;
y /= c;
z /= c;
return *this;
}
/**
* Add vector operator.
*/
Vector operator+(const Vector &v) const
{
return Vector(x + v.x,
y + v.y,
z + v.z);
}
/**
* In-place add vector operator.
*/
Vector &operator+=(const Vector &v)
{
x += v.x;
y += v.y;
z += v.z;
return *this;
}
/**
* Subtract vector operator.
*/
Vector operator-(const Vector &v) const
{
return Vector(x - v.x,
y - v.y,
z - v.z);
}
/**
* In-place subtract vector operator.
*/
Vector &operator-=(const Vector &v)
{
x -= v.x;
y -= v.y;
z -= v.z;
return *this;
}
/**
* Returns the length of this vector. This method does a relatively
* slow square root.
*/
float length() const
{
return sqrtf(x * x + y * y + z * z);
}
/**
* Returns the squared length of this vector. Avoids the square root.
*/
float squaredLength() const
{
return x * x + y * y + z * z;
}
/**
* Returns the manhattan length of this vector.
*/
float manhattanLength() const
{
return fabsf(x) + fabsf(y) + fabsf(z);
}
/**
* Returns a normalized version of this vector. This is a unit vector
* running parallel to it.
*/
Vector normalized() const
{
const float l = length();
return Vector(x / l, y / l, z / l);
}
float x = 0.0f;
float y = 0.0f;
float z = 0.0f;
};
inline bool operator == (const Vector &a, const Vector &b)
{
return a.x == b.x && a.y == b.y && a.z == b.z;
}
/**
* Appends a string representation of a vector to the output stream.
*/
std::ostream& operator <<(std::ostream &os, const Vector &v);
#endif // VECTOR_H
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