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

 /*
  * box2djoint.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 "box2djoint.h"
 #include "box2dworld.h"
 #include "box2dbody.h"
 
 #include <QDebug>
 
 Box2DJoint::Box2DJoint(JointType jointType, QObject *parent) :
     QObject(parent),
     mJointType(jointType),
     mCollideConnected(false),
     mComponentComplete(false),
     mInitializePending(false),
     mBodyA(0),
     mBodyB(0),
     mWorld(0),
     mJoint(0)
 {
 }
 
 Box2DJoint::~Box2DJoint()
 {
     if (mJoint)
         mWorld->world().DestroyJoint(mJoint);
 }
 
 void Box2DJoint::setCollideConnected(bool collideConnected)
 {
     if (mCollideConnected == collideConnected)
         return;
 
     mCollideConnected = collideConnected;
 
     emit collideConnectedChanged();
 }
 
 void Box2DJoint::setBodyA(Box2DBody *bodyA)
 {
     if (mBodyA == bodyA)
         return;
 
     mBodyA = bodyA;
 
     if (!bodyA || bodyA->body())
         initialize();
     else
         connect(bodyA, SIGNAL(bodyCreated()), this, SLOT(bodyACreated()));
 
     emit bodyAChanged();
 }
 
 void Box2DJoint::setBodyB(Box2DBody *bodyB)
 {
     if (mBodyB == bodyB)
         return;
 
     mBodyB = bodyB;
 
     if (!bodyB || bodyB->body())
         initialize();
     else
         connect(bodyB, SIGNAL(bodyCreated()), this, SLOT(bodyBCreated()));
 
     emit bodyBChanged();
 }
 
 void Box2DJoint::initialize()
 {
     // Delay initialization until the component is complete
     if (!mComponentComplete) {
         mInitializePending = true;
         return;
     }
     mInitializePending = false;
 
     // Destroy any previously created joint
     if (mJoint) {
         mWorld->world().DestroyJoint(mJoint);
         mJoint = 0;
         mWorld = 0;
     }
 
     if (!mBodyA || !mBodyB)
         return;
     if (!mBodyA->body() || !mBodyB->body())
         return;
 
     if (mBodyA->world() != mBodyB->world()) {
         qWarning() << "Joint: bodyA and bodyB are not from the same world";
         return;
     }
 
     if (mBodyA == mBodyB) {
         qWarning() << "Joint: bodyA and bodyB cannot be the same body";
         return;
     }
 
     mWorld = mBodyA->world();
     mJoint = createJoint();
     if (mJoint)
         emit created();
 }
 
 void Box2DJoint::componentComplete()
 {
     mComponentComplete = true;
     if (mInitializePending)
         initialize();
 }
 
 void Box2DJoint::initializeJointDef(b2JointDef &def)
 {
     def.userData = this;
     def.bodyA = bodyA()->body();
     def.bodyB = bodyB()->body();
     def.collideConnected = mCollideConnected;
 }
 
 void Box2DJoint::bodyACreated()
 {
     disconnect(mBodyA, SIGNAL(bodyCreated()), this, SLOT(bodyACreated()));
     initialize();
 }
 
 void Box2DJoint::bodyBCreated()
 {
     disconnect(mBodyB, SIGNAL(bodyCreated()), this, SLOT(bodyBCreated()));
     initialize();
 }