box2dfrictionjoint.h

/*
 * box2dfrictionjoint.h
 * Copyright (c) 2011 Joonas Erkinheimo <joonas.erkinheimo@nokia.com>
 *
 * This file is part of the Box2D QML plugin.
 *
 * This software is provided 'as-is', without any express or implied warranty.
 * In no event will the authors be held liable for any damages arising from
 * the use of this software.
 *
 * Permission is granted to anyone to use this software for any purpose,
 * including commercial applications, and to alter it and redistribute it
 * freely, subject to the following restrictions:
 *
 * 1. The origin of this software must not be misrepresented; you must not
 *    claim that you wrote the original software. If you use this software in
 *    a product, an acknowledgment in the product documentation would be
 *    appreciated but is not required.
 *
 * 2. Altered source versions must be plainly marked as such, and must not be
 *    misrepresented as being the original software.
 *
 * 3. This notice may not be removed or altered from any source distribution.
 */

#ifndef BOX2FRICTIONJOINT_H
#define BOX2FRICTIONJOINT_H

#include "box2djoint.h"
#include <Box2D.h>

class Box2DFrictionJoint : public Box2DJoint
{
    Q_OBJECT

    Q_PROPERTY(QPointF localAnchorA READ localAnchorA WRITE setLocalAnchorA NOTIFY localAnchorAChanged)
    Q_PROPERTY(QPointF localAnchorB READ localAnchorB WRITE setLocalAnchorB NOTIFY localAnchorBChanged)
    Q_PROPERTY(float maxForce READ maxForce WRITE setMaxForce NOTIFY maxForceChanged)
    Q_PROPERTY(float maxTorque READ maxTorque WRITE setMaxTorque NOTIFY maxTorqueChanged)

public:
    explicit Box2DFrictionJoint(QObject *parent = 0);

    QPointF localAnchorA() const;
    void setLocalAnchorA(const QPointF &localAnchorA);

    QPointF localAnchorB() const;
    void setLocalAnchorB(const QPointF &localAnchorB);

    float maxForce() const;
    void setMaxForce(float maxForce);

    float maxTorque() const;
    void setMaxTorque(float maxTorque);

    b2FrictionJoint *frictionJoint() const;

    Q_INVOKABLE QPointF getReactionForce(float32 inv_dt) const;
    Q_INVOKABLE float getReactionTorque(float32 inv_dt) const;

signals:
    void localAnchorAChanged();
    void localAnchorBChanged();
    void maxForceChanged();
    void maxTorqueChanged();

protected:
    b2Joint *createJoint();

private:
    QPointF m_localAnchorA;
    QPointF m_localAnchorB;
    float m_maxForce;
    float m_maxTorque;
    bool m_defaultLocalAnchorA;
    bool m_defaultLocalAnchorB;
};

inline QPointF Box2DFrictionJoint::localAnchorA() const
{
    return m_localAnchorA;
}

inline QPointF Box2DFrictionJoint::localAnchorB() const
{
    return m_localAnchorB;
}

inline float Box2DFrictionJoint::maxForce() const
{
    return m_maxForce;
}

inline float Box2DFrictionJoint::maxTorque() const
{
    return m_maxTorque;
}

inline b2FrictionJoint *Box2DFrictionJoint::frictionJoint() const
{
    return static_cast<b2FrictionJoint*>(joint());
}

#endif // BOX2FRICTIONJOINT_H