C++ PhysicsSprite::setPhysicsBody方法代码示例

void Box2DTestLayer::addNewSpriteAtPosition(CCPoint p)
{
    CCLOG("Add sprite %0.2f x %02.f",p.x,p.y);
    CCNode* parent = getChildByTag(kTagParentNode);
    
    //We have a 64x64 sprite sheet with 4 different 32x32 images.  The following code is
    //just randomly picking one of the images
    int idx = (CCRANDOM_0_1() > .5 ? 0:1);
    int idy = (CCRANDOM_0_1() > .5 ? 0:1);
    PhysicsSprite *sprite = new PhysicsSprite();
    sprite->initWithTexture(m_pSpriteTexture, CCRectMake(32 * idx,32 * idy,32,32));
    sprite->autorelease();

    parent->addChild(sprite);
    
    sprite->setPosition( CCPointMake( p.x, p.y) );
    
    // Define the dynamic body.
    //Set up a 1m squared box in the physics world
    b2BodyDef bodyDef;
    bodyDef.type = b2_dynamicBody;
    bodyDef.position.Set(p.x/PTM_RATIO, p.y/PTM_RATIO);

    b2Body *body = world->CreateBody(&bodyDef);
    
    // Define another box shape for our dynamic body.
    b2PolygonShape dynamicBox;
    dynamicBox.SetAsBox(.5f, .5f);//These are mid points for our 1m box
    
    // Define the dynamic body fixture.
    b2FixtureDef fixtureDef;
    fixtureDef.shape = &dynamicBox;    
    fixtureDef.density = 1.0f;
    fixtureDef.friction = 0.3f;
    body->CreateFixture(&fixtureDef);

    sprite->setPhysicsBody(body);
}

void HelloWorld::addNewSpriteAtPosition(CCPoint p)
{
   CCLOG("Add sprite %0.2f x %02.f",p.x,p.y);
   CCNode* parent = getChildByTag(kTagParentNode);
   
   //We have a 64x64 sprite sheet with 4 different 32x32 images.  The following code is
   //just randomly picking one of the images
   int idx = (CCRANDOM_0_1() > .5 ? 0:1);
   int idy = (CCRANDOM_0_1() > .5 ? 0:1);
   PhysicsSprite *sprite = new PhysicsSprite();
   sprite->initWithTexture(m_pSpriteTexture, CCRectMake(32 * idx,32 * idy,32,32));
   sprite->autorelease();
   
   parent->addChild(sprite);
   
   sprite->setPosition( CCPointMake( p.x, p.y) );
   sprite->setOpacity(32);
   
   // Define the dynamic body.
   //Set up a 1m squared box in the physics world
   b2BodyDef bodyDef;
   bodyDef.type = b2_dynamicBody;
   bodyDef.position.Set(p.x/PTM_RATIO, p.y/PTM_RATIO);
   
   b2Body *body = world->CreateBody(&bodyDef);
   
   // Define another box shape for our dynamic body.
   b2PolygonShape dynamicBox;
   dynamicBox.SetAsBox(.5f, .5f);//These are mid points for our 1m box
   
   // Define the dynamic body fixture.
   b2FixtureDef fixtureDef;
   fixtureDef.shape = &dynamicBox;
   fixtureDef.density = 1.0f;
   fixtureDef.friction = 0.3f;
   body->CreateFixture(&fixtureDef);
   
   sprite->setPhysicsBody(body);
   
   // Create a rope joint so that the
   // block will "swing" from the top of the
   // scene.
   
   // Calculate the local position of the
   // top of screen in the local space
   // of the ground box.
   CCSize scrSize = CCDirector::sharedDirector()->getWinSize();
   b2Vec2 groundWorldPos = b2Vec2((scrSize.width/2)/PTM_RATIO,(scrSize.height)/PTM_RATIO);
   b2Vec2 groundLocalPos = m_pGround->GetLocalPoint(groundWorldPos);
   
   // Now create the main swinging joint.
   b2RopeJointDef jointDef;
   jointDef.bodyA = m_pGround;
   jointDef.bodyB = body;
   jointDef.localAnchorA = groundLocalPos;
   jointDef.localAnchorB = b2Vec2(0.0f,0.0f);
   jointDef.maxLength = (groundWorldPos-body->GetWorldCenter()).Length();
   jointDef.collideConnected = true;
   world->CreateJoint(&jointDef);
   
   // Now create a second/third rope to "constrain" the swing.
   // These one will be attached to the side of the screen.
   b2Vec2 groundWorldPos2 = b2Vec2(0,body->GetWorldCenter().y);
   b2Vec2 groundLocalPos2 = m_pGround->GetLocalPoint(groundWorldPos2);

   jointDef.localAnchorA = groundLocalPos2;
   // Setting the length of the side rope...
   // What we want to do here is use the distance from the center as
   // the length of the rope.  Then add length to it so that the box
   // can have at least one full swing which ever side it is on (left or
   // right half of the scene).
   float32 distToCenter = (fabs(scrSize.width/2 - (body->GetWorldCenter().x)*PTM_RATIO))/PTM_RATIO;
   jointDef.maxLength = distToCenter + (scrSize.width/2)/PTM_RATIO;
   world->CreateJoint(&jointDef);
   
   // Now for the last rope, other side of the scene.
   // Now create a second/third rope to "constrain" the swing.
   // These one will be attached to the side of the screen.
   b2Vec2 groundWorldPos3 = b2Vec2((scrSize.width)/PTM_RATIO,body->GetWorldCenter().y);
   b2Vec2 groundLocalPos3 = m_pGround->GetLocalPoint(groundWorldPos3);
   jointDef.localAnchorA = groundLocalPos3;
   world->CreateJoint(&jointDef);

}