File indexing completed on 2024-04-21 14:43:26

 /*
  * box2drevolutejoint.cpp
  * Copyright (c) 2011 Joonas Erkinheimo <joonas.erkinheimo@nokia.com>
  * Copyright (c) 2011 Markus Kivioja <markus.kivioja@digia.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 "box2dropejoint.h"
 
 #include "box2dworld.h"
 
 Box2DRopeJoint::Box2DRopeJoint(QObject *parent)
     : Box2DJoint(RopeJoint, parent)
     , m_maxLength(0.0f)
     , m_defaultLocalAnchorA(true)
     , m_defaultLocalAnchorB(true)
 {
 }
 
 void Box2DRopeJoint::setLocalAnchorA(const QPointF &localAnchorA)
 {
     m_defaultLocalAnchorA = false;
 
     if (m_localAnchorA == localAnchorA)
         return;
 
     m_localAnchorA = localAnchorA;
     emit localAnchorAChanged();
 }
 
 void Box2DRopeJoint::setLocalAnchorB(const QPointF &localAnchorB)
 {
     m_defaultLocalAnchorB = false;
 
     if (m_localAnchorB == localAnchorB)
         return;
 
     m_localAnchorB = localAnchorB;
     emit localAnchorBChanged();
 }
 
 void Box2DRopeJoint::setMaxLength(float maxLength)
 {
     if (m_maxLength == maxLength)
         return;
 
     m_maxLength = maxLength;
     if (ropeJoint()) {
         const float maxLengthMeters = world()->toMeters(maxLength);
         if (maxLengthMeters < b2_linearSlop)
             qWarning() << "RopeJoint: maxLength too small";
 
         ropeJoint()->SetMaxLength(maxLengthMeters);
     }
     emit maxLengthChanged();
 }
 
 b2Joint *Box2DRopeJoint::createJoint()
 {
     b2RopeJointDef jointDef;
     initializeJointDef(jointDef);
 
     // Default localAnchorA to bodyA center
     if (m_defaultLocalAnchorA)
         jointDef.localAnchorA = jointDef.bodyA->GetLocalCenter();
     else
         jointDef.localAnchorA = world()->toMeters(m_localAnchorA);
 
     // Default localAnchorB to bodyB center
     if (m_defaultLocalAnchorB)
         jointDef.localAnchorB = jointDef.bodyB->GetLocalCenter();
     else
         jointDef.localAnchorB = world()->toMeters(m_localAnchorB);
 
     jointDef.maxLength = world()->toMeters(m_maxLength);
 
     if (jointDef.maxLength < b2_linearSlop)
         qWarning() << "RopeJoint: maxLength too small";
 
     return world()->world().CreateJoint(&jointDef);
 }
 
 QPointF Box2DRopeJoint::getReactionForce(float32 inv_dt) const
 {
     if (ropeJoint())
         return invertY(ropeJoint()->GetReactionForce(inv_dt));
     return QPointF();
 }
 
 float Box2DRopeJoint::getReactionTorque(float32 inv_dt) const
 {
     if (ropeJoint())
         return ropeJoint()->GetReactionTorque(inv_dt);
     return 0.0f;
 }