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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. *
***************************************************************************/
#include "mechanicsdocument.h"
#include "mechanicsitem.h"
#include "mechanicssimulation.h"
#include <cmath>
#include <qtimer.h>
MechanicsSimulation::MechanicsSimulation( MechanicsDocument *mechanicsDocument )
: QObject(mechanicsDocument)
{
p_mechanicsDocument = mechanicsDocument;
m_advanceTmr = new QTimer(this);
connect( m_advanceTmr, SIGNAL(timeout()), this, SLOT(slotAdvance()) );
m_advanceTmr->start(1);
}
MechanicsSimulation::~MechanicsSimulation()
{
}
void MechanicsSimulation::slotAdvance()
{
if ( p_mechanicsDocument && p_mechanicsDocument->canvas() )
p_mechanicsDocument->canvas()->advance();
}
RigidBody::RigidBody( MechanicsDocument *mechanicsDocument )
{
p_mechanicsDocument = mechanicsDocument;
p_overallParent = 0l;
}
RigidBody::~RigidBody()
{
}
bool RigidBody::addMechanicsItem( MechanicsItem *item )
{
if ( !item || m_mechanicsItemList.contains(item) )
return false;
m_mechanicsItemList.append(item);
findOverallParent();
return true;
}
void RigidBody::moveBy( double dx, double dy )
{
if (overallParent())
overallParent()->moveBy( dx, dy );
}
void RigidBody::rotateBy( double dtheta )
{
if (overallParent())
overallParent()->rotateBy(dtheta);
}
bool RigidBody::findOverallParent()
{
p_overallParent = 0l;
if ( m_mechanicsItemList.isEmpty() )
return false;
m_mechanicsItemList.remove(0l);
const MechanicsItemList::iterator end = m_mechanicsItemList.end();
for ( MechanicsItemList::iterator it = m_mechanicsItemList.begin(); it != end; ++it )
{
MechanicsItem *parentItem = *it;
MechanicsItem *parentCandidate = dynamic_cast<MechanicsItem*>((*it)->parentItem());
while (parentCandidate)
{
parentItem = parentCandidate;
parentCandidate = dynamic_cast<MechanicsItem*>(parentItem->parentItem());
}
if ( !p_overallParent )
// Must be the first item to test
p_overallParent = parentItem;
if ( p_overallParent != parentItem )
{
p_overallParent = 0l;
return false;
}
}
return true;
}
void RigidBody::updateRigidBodyInfo()
{
if (!p_overallParent)
return;
m_mass = p_overallParent->mechanicsInfoCombined()->mass;
m_momentOfInertia = p_overallParent->mechanicsInfoCombined()->momentOfInertia;
}
Vector2D::Vector2D()
{
x = 0.;
y = 0.;
}
double Vector2D::length() const
{
return std::sqrt( x*x + y*y );
}
RigidBodyState::RigidBodyState()
{
angularMomentum = 0.;
}
#include "mechanicssimulation.moc"
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