mototrialracer/box2dqmlplugin/box2dbody.h

/*
 * Box2D QML plugin
 * Copyright (C) 2010 Nokia Corporation
 *
 * This file is part of the Box2D QML plugin.
 *
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2.1 of the License, or (at
 * your option) any later version.
 *
 * This library 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 Lesser General Public
 * License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library;  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef BOX2DBODY_H
#define BOX2DBODY_H

#include <QDeclarativeItem>

class Box2DFixture;
class Box2DWorld;

class b2Body;
class b2World;

/**
 * The Box2D body, build up from a list of shapes.
 */
class Box2DBody : public QDeclarativeItem
{
    Q_OBJECT

    Q_ENUMS(BodyType)
    Q_PROPERTY(qreal linearDamping READ linearDamping WRITE setLinearDamping NOTIFY linearDampingChanged)
    Q_PROPERTY(qreal angularDamping READ angularDamping WRITE setAngularDamping NOTIFY angularDampingChanged)
    Q_PROPERTY(BodyType bodyType READ bodyType WRITE setBodyType NOTIFY bodyTypeChanged)
    Q_PROPERTY(bool bullet READ isBullet WRITE setBullet NOTIFY bulletChanged)
    Q_PROPERTY(bool sleepingAllowed READ sleepingAllowed WRITE setSleepingAllowed NOTIFY sleepingAllowedChanged)
    Q_PROPERTY(bool fixedRotation READ fixedRotation WRITE setFixedRotation NOTIFY fixedRotationChanged)
    Q_PROPERTY(bool active READ active WRITE setActive)
    Q_PROPERTY(QPointF linearVelocity READ linearVelocity WRITE setLinearVelocity NOTIFY linearVelocityChanged)
    Q_PROPERTY(float angularVelocity READ angularVelocity WRITE setAngularVelocity NOTIFY angularVelocityChanged)
    Q_PROPERTY(QDeclarativeListProperty<Box2DFixture> fixtures READ fixtures)

public:
    enum BodyType {
        Static,
        Kinematic,
        Dynamic
    };

    explicit Box2DBody(QDeclarativeItem *parent = 0);
    ~Box2DBody();

    qreal linearDamping() const { return mLinearDamping; }
    void setLinearDamping(qreal linearDamping);

    qreal angularDamping() const { return mAngularDamping; }
    void setAngularDamping(qreal angularDamping);

    BodyType bodyType() const { return mBodyType; }
    void setBodyType(BodyType bodyType);

    bool isBullet() const { return mBullet; }
    void setBullet(bool bullet);

    bool sleepingAllowed() const { return mSleepingAllowed; }
    void setSleepingAllowed(bool allowed);

    bool fixedRotation() const { return mFixedRotation; }
    void setFixedRotation(bool fixedRotation);

    bool active() const { return mActive; }
    void setActive(bool active);

    QPointF linearVelocity() const { return mLinearVelocity; }
    void setLinearVelocity(const QPointF &linearVelocity);

    float angularVelocity() const { return mAngularVelocity; }
    void setAngularVelocity(float angularVelocity);

    void resetVelocities();

    QDeclarativeListProperty<Box2DFixture> fixtures();

    void initialize(b2World *world);
    void synchronize();
    void cleanup(b2World *world);

    Q_INVOKABLE void applyLinearImpulse(const QPointF &impulse,
                                        const QPointF &point);
    Q_INVOKABLE void applyTorque(qreal torque);
    Q_INVOKABLE QPointF getWorldCenter() const;

    void componentComplete();

    b2Body* body() const;

protected:
    void geometryChanged(const QRectF &newGeometry, const QRectF &oldGeometry);

signals:
    void linearDampingChanged();
    void angularDampingChanged();
    void bodyTypeChanged();
    void bulletChanged();
    void sleepingAllowedChanged();
    void fixedRotationChanged();
    void linearVelocityChanged();
    void angularVelocityChanged();
    void bodyCreated();

private slots:
    void onRotationChanged();

private:
    static void append_fixture(QDeclarativeListProperty<Box2DFixture> *list,
                               Box2DFixture *fixture);

    b2Body *mBody;
    b2World *mWorld;
    qreal mLinearDamping;
    qreal mAngularDamping;
    BodyType mBodyType;
    bool mBullet;
    bool mSleepingAllowed;
    bool mFixedRotation;
    bool mActive;
    QPointF mLinearVelocity;
    float mAngularVelocity;
    bool mSynchronizing;
    bool mInitializePending;
    QList<Box2DFixture*> mFixtures;
};

#endif // BOX2DBODY_H