ccBBox ccDrawableObject::getFitBB(ccGLMatrix& trans)
{
//Default behavior: returns axis aligned bounding box!
trans.toIdentity();
return getBB(true,false,m_currentDisplay);
}
void ccClipBox::get(ccBBox& extents, ccGLMatrix& transformation)
{
extents = m_box;
if (isGLTransEnabled())
{
transformation = m_glTrans;
}
else
{
transformation.toIdentity();
}
}
//===============================================getAbsoluteGLTransformation===================================================//
//由祖先到子物体，将旋转矩阵依次累加
bool ccHObject::getAbsoluteGLTransformation(ccGLMatrix& trans) const
{
trans.toIdentity();
bool hasGLTrans = false;
//recurse among ancestors to get the absolute GL transformation
const ccHObject* obj = this;
while (obj){
if (obj->isGLTransEnabled()){ //是否可进行变换
trans = trans * obj->getGLTransformation();
hasGLTrans = true;
}
obj = obj->getParent();
}
return hasGLTrans;
}