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box2dmousejoint.cpp
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box2dmousejoint.cpp
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/*
* box2dmousejoint.cpp
* Copyright (c) 2011 Joonas Erkinheimo <[email protected]>
*
* 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.
*/
#include "box2dmousejoint.h"
#include "box2dworld.h"
#include "box2dbody.h"
Box2DMouseJoint::Box2DMouseJoint(QObject *parent)
: Box2DJoint(MouseJoint, parent)
, m_maxForce(0.0f)
, m_frequencyHz(5.0f)
, m_dampingRatio(0.7f)
{
}
void Box2DMouseJoint::setDampingRatio(float dampingRatio)
{
if (m_dampingRatio == dampingRatio)
return;
m_dampingRatio = dampingRatio;
if (mouseJoint())
mouseJoint()->SetDampingRatio(dampingRatio);
emit dampingRatioChanged();
}
void Box2DMouseJoint::setFrequencyHz(float frequencyHz)
{
if (m_frequencyHz == frequencyHz)
return;
m_frequencyHz = frequencyHz;
if (mouseJoint())
mouseJoint()->SetFrequency(frequencyHz);
emit frequencyHzChanged();
}
void Box2DMouseJoint::setMaxForce(float maxForce)
{
if (m_maxForce == maxForce)
return;
m_maxForce = maxForce;
if (mouseJoint())
mouseJoint()->SetMaxForce(maxForce);
emit maxForceChanged();
}
void Box2DMouseJoint::setTarget(const QPointF &target)
{
if (m_target == target)
return;
m_target = target;
if (mouseJoint())
mouseJoint()->SetTarget(world()->toMeters(target));
emit targetChanged();
}
b2Joint *Box2DMouseJoint::createJoint()
{
b2MouseJointDef jointDef;
initializeJointDef(jointDef);
jointDef.target = world()->toMeters(m_target);
jointDef.maxForce = m_maxForce;
jointDef.frequencyHz = m_frequencyHz;
jointDef.dampingRatio = m_dampingRatio;
return world()->world().CreateJoint(&jointDef);
}
QPointF Box2DMouseJoint::getReactionForce(float32 inv_dt) const
{
if (mouseJoint())
return invertY(mouseJoint()->GetReactionForce(inv_dt));
return QPointF();
}
float Box2DMouseJoint::getReactionTorque(float32 inv_dt) const
{
if (mouseJoint())
return mouseJoint()->GetReactionTorque(inv_dt);
return 0.0f;
}