File indexing completed on 2024-04-14 14:08:24

 /*
  * box2dmousejoint.cpp
  * 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.
  */
 
 #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;
 }