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/***************************************************************************
* Copyright (C) 2005 by David Saxton *
* david@bluehaze.org *
* *
* 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. *
***************************************************************************/
#ifndef MECHANICSSIMULATION_H
#define MECHANICSSIMULATION_H
#include <qguardedptr.h>
#include <qobject.h>
#include <qvaluelist.h>
class MechanicsItem;
class MechanicsDocument;
typedef QValueList<MechanicsItem*> MechanicsItemList;
/**
@short 2 dimensional vector with associated length functions et al
@author David Saxton
*/
class Vector2D
{
public:
Vector2D();
double length() const;
double lengthSquared() const { return x*x + y*y; }
double x;
double y;
};
/**
@short State of a rigid body, in an inertial MechanicsDocument frame
@author David Saxton
*/
class RigidBodyState
{
public:
RigidBodyState();
Vector2D linearMomentum;
double angularMomentum;
Vector2D position; // Position of center of mass
};
/**
@author David Saxton
*/
class MechanicsSimulation : public QObject
{
Q_OBJECT
public:
MechanicsSimulation( MechanicsDocument *mechanicsDocument );
~MechanicsSimulation();
MechanicsDocument* mechanicsDocument() const { return p_mechanicsDocument; }
protected slots:
void slotAdvance();
protected:
QGuardedPtr<MechanicsDocument> p_mechanicsDocument;
QTimer *m_advanceTmr;
};
/**
Rigid body with mass, inertia, etc. Collection of mechanics items with
functionality for moving them about, rotating, etc. Only one mother-parent
(has no parent itself, all other items are descendents) allowed.
@short Rigid body, handles MechanicsItems
@author David Saxton
*/
class RigidBody
{
public:
RigidBody( MechanicsDocument *mechanicsDocument );
~RigidBody();
/**
*
*/
void advance( int phase, double delta );
/**
* Add the MechanicsItem to the entity.
* @returns true iff successful in adding
*/
bool addMechanicsItem( MechanicsItem *item );
/**
* Pointer to the mother MechanicsItem.
*/
MechanicsItem *overallParent() const { return p_overallParent; }
/**
* Updates the mass and the moment of inertia info
*/
void updateRigidBodyInfo();
protected:
/**
* Attempt to find the overall parent.
* @returns false iff unsucessful (including if there are no MechanicsItems present)
*/
bool findOverallParent();
/**
* Move the set of MechanicsItems by the given amount
*/
void moveBy( double dx, double dy );
/**
* Rotate the set of MechanicsItems by the given amount about the center of
* mass.
* @param angle Rotate amount in radians
*/
void rotateBy( double dtheta );
MechanicsItemList m_mechanicsItemList;
MechanicsItem *p_overallParent;
MechanicsDocument *p_mechanicsDocument;
RigidBodyState m_rigidBodyState;
double m_mass;
double m_momentOfInertia;
};
#endif
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