I am new to this platform. I am right now working on cocos2dx with box2d and spriteHelper. I have created physics objects in spriteHelper and can able to simulate it in same. But When I try to do this through coding, mouse joint is not created and giving me error.
Here is my code:
std::string Nest::initTest()
{
this->setTouchEnabled(true);
CCSize s = CCDirector::sharedDirector()->getWinSize();
#if 1
// Use batch node. Faster
//when using batches - load a batch node using the generated image
batchNodeParent = CCSpriteBatchNode::create("Letters_nest.png", 100);
this->addChild(batchNodeParent, 1);
#endif
CCSpriteFrameCache::sharedSpriteFrameCache()->removeUnusedSpriteFrames();
//load into the sprite frame cache the plist generated by SH
CCSpriteFrameCache::sharedSpriteFrameCache()->addSpriteFramesWithFile("Letters_nest.plist");
this->initPhysics();
GHDebugDrawLayer* debugDraw = GHDebugDrawLayer::createDebugDrawLayerWithWorld(world);
this->addChild(debugDraw, 1000);
GHDirector::sharedDirector()->setPhysicalWorld(world);
GHDirector::sharedDirector()->setPointToMeterRatio(PTM_RATIO);
CCSprite *bg = CCSprite ::create("bg.png");//createWithSpriteFrameName("bg.png");//
bg->setAnchorPoint(ccp(0,1));
bg->setPosition(VisibleRect::leftTop());
this->addChild(bg, 0);
GHSprite* nestImage = GHSprite::createWithSpriteFrameName("nest.png");
GHSprite* egg1 = GHSprite::createWithSpriteFrameName("egg.png");
GHSprite* egg2 = GHSprite::createWithSpriteFrameName("egg.png");
nestImage->setPosition(ccp(s.width/2,s.height/2));
egg1->setPosition(ccp(VisibleRect::center().x-50,VisibleRect::center().y+70));
egg2->setPosition(ccp(VisibleRect::center().x+50,VisibleRect::center().y+70));
if(batchNodeParent != NULL){//if we use batch nodes we must add the sprite to its batch parent
batchNodeParent->addChild(nestImage);
batchNodeParent->addChild(egg1);
batchNodeParent->addChild(egg2);
}
else{//if we dont use batch nodes then we must add the sprite to a normal node - e.g the layer or another node
this->addChild(nestImage);
this->addChild(egg1);
this->addChild(egg2);
}
this->scheduleUpdate();
return "";
}
void Nest::beganTouchAtPosition(cocos2d::CCPoint p){
// CCPoint location = CCDirector::sharedDirector()->convertToGL(p);
CCPoint location = p;
b2Vec2 v = b2Vec2(location.x/PTM_RATIO, location.y/PTM_RATIO);
for (b2Body *b = world->GetBodyList(); b; b = b->GetNext()) {
b2Fixture *f = b->GetFixtureList(); // get the first fixture
CCSprite *sprite =(CCSprite *) b->GetUserData();
if(sprite != NULL)
{
CCLog("sprite not NUll %d",sprite->getTag());
** if(f -> TestPoint(v)) /// This line not executing**
{
CCLog("You touched a body %d",sprite->getTag());
b2MouseJointDef md;
md.bodyA = groundBody;
md.bodyB = b;
md.target = v;
md.collideConnected = true;
md.maxForce = 1000.0f * b->GetMass();
mouseJoint = (b2MouseJoint *)world->CreateJoint(&md);
b->SetAwake(true);
}
}
}
}
void Nest::moveObjectAtPosition(cocos2d::CCPoint p){
if (!mouseJoint) return;
CCPoint location = p;
b2Vec2 locationWorld = b2Vec2(location.x/PTM_RATIO, location.y/PTM_RATIO);
** mouseJoint->SetTarget(locationWorld); // Error line exc_Bad_acess**
}
void Nest::endTouchAtPosition(CCPoint p)
{
if (mouseJoint ) {
world->DestroyJoint(mouseJoint);
mouseJoint = NULL;
boolMouseJoint = false;
}
}
void Nest::initPhysics()
{
CCSize s = CCDirector::sharedDirector()->getWinSize();
b2Vec2 gravity;
gravity.Set(0.0f, -10.0f);
world = new b2World(gravity);
// Do we want to let bodies sleep?
world->SetAllowSleeping(true);
world->SetContinuousPhysics(true);
b2BodyDef groundBodyDef;
groundBodyDef.position.Set(0, 0); // bottom-left corner
groundBody = world->CreateBody(&groundBodyDef);
b2EdgeShape groundBox;
// bottom
groundBox.Set(b2Vec2(0,0), b2Vec2(s.width/PTM_RATIO,0));
groundBody->CreateFixture(&groundBox,0);
// top
groundBox.Set(b2Vec2(0,s.height/PTM_RATIO), b2Vec2(s.width/PTM_RATIO,s.height/PTM_RATIO));
groundBody->CreateFixture(&groundBox,0);
// left
groundBox.Set(b2Vec2(0,s.height/PTM_RATIO), b2Vec2(0,0));
groundBody->CreateFixture(&groundBox,0);
// right
groundBox.Set(b2Vec2(s.width/PTM_RATIO,s.height/PTM_RATIO), b2Vec2(s.width/PTM_RATIO,0));
groundBody->CreateFixture(&groundBox,0);
}
void Nest::update(float dt)
{
int32 velocityIterations = 8;
int32 positionIterations = 1;
for (b2Body* b = world->GetBodyList(); b; b = b->GetNext())
{
if (b->GetUserData() != NULL) {
//Synchronize the AtlasSprites position and rotation with the corresponding body
CCSprite* myActor = (CCSprite*)b->GetUserData();
myActor->setPosition( CCPointMake( b->GetPosition().x * PTM_RATIO, b->GetPosition().y * PTM_RATIO) );
myActor->setRotation( -1 * CC_RADIANS_TO_DEGREES(b->GetAngle()) );
} }
}
I have also attached screenshot for the error message.
Please help.
2.png (341.9 KB)
