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/*
Copyright 2010 Stefan Majewsky <majewsky@gmx.net>
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
(at your option) 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, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef KOLF_VECTOR_H
#define KOLF_VECTOR_H
#include <QPointF>
#include <cmath>
inline int rad2deg(double radians)
{
return (180 / M_PI) * radians;
}
inline double deg2rad(int degrees)
{
return (M_PI / 180) * degrees;
}
class Vector : public QPointF
{
public:
inline Vector(const QPointF& point = QPointF()) : QPointF(point) {}
inline Vector(qreal x, qreal y) : QPointF(x, y) {}
inline Vector& operator=(const QPointF& point) { setX(point.x()); setY(point.y()); return *this; }
//dot product
inline qreal operator*(const Vector& rhs) const;
//getters and setters for polar coordinates
inline qreal magnitude() const;
inline qreal direction() const; //in radians!
inline void setMagnitude(qreal magnitude);
inline void setDirection(qreal direction);
inline void setMagnitudeDirection(qreal magnitude, qreal direction);
static inline Vector fromMagnitudeDirection(qreal magnitude, qreal direction);
//some further convenience
inline Vector unitVector() const;
};
qreal Vector::operator*(const Vector& rhs) const
{
return x() * rhs.x() + y() * rhs.y();
}
qreal Vector::magnitude() const
{
return sqrt(*this * *this);
}
qreal Vector::direction() const
{
return atan2(y(), x());
}
void Vector::setMagnitude(qreal magnitude)
{
setMagnitudeDirection(magnitude, this->direction());
}
void Vector::setDirection(qreal direction)
{
setMagnitudeDirection(this->magnitude(), direction);
}
void Vector::setMagnitudeDirection(qreal magnitude, qreal direction)
{
setX(magnitude * cos(direction));
setY(magnitude * sin(direction));
}
Vector Vector::fromMagnitudeDirection(qreal magnitude, qreal direction)
{
Vector v;
v.setMagnitudeDirection(magnitude, direction);
return v;
}
Vector Vector::unitVector() const
{
return *this / magnitude();
}
#endif // KOLF_VECTOR_H
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