Writing an Atoms operator

An Atoms operator is an Atoms graph node but with already an out pose port and some function to access the agent what own this node.
The operator in this example add an offset to a joint transform
#include <AtomsGraph/Ports.h>
#include <Atoms/Globals.h>
#include <Atoms/Graph/Operator.h>

class JointOffsetOperator : public Atoms::Operator
{
public:

	NODE_STANDARD_MEMBERS

	JointOffsetOperator();

	virtual ~JointOffsetOperator();

	bool	compute();

private:

	AtomsGraph::PosePort* m_inPose;
	AtomsGraph::StringPort *m_jointName;
	AtomsGraph::MatrixPort *m_offsetMatrix;
	AtomsGraph::BooleanPort *m_worldSpace;
		
	int m_jointId;
	bool m_first;
};

// this must bu unique
#define JOINT_OFFSET_OPERATOR_ID 9999991 

NODE_STANDARD_MEMBERS_IMPL(JointOffsetOperator)
unsigned int JointOffsetOperator::staticTypeId() { return JOINT_OFFSET_OPERATOR_ID; }
std::string JointOffsetOperator::staticTypeStr() { return std::string("JointOffsetOperator"); }

JointOffsetOperator::JointOffsetOperator() : Operator()
{
	m_jointName= new AtomsGraph::StringPort("jointName");
	m_jointName->set("");
	addInputPort(m_jointName);

	m_offsetMatrix = new AtomsGraph::MatrixPort("offsetMatrix");
	addInputPort(m_offsetMatrix);

	m_inPose = new AtomsGraph::PosePort("inPose");
	addInputPort(m_inPose);

	m_worldSpace = new AtomsGraph::BooleanPort("worldSpace");
	m_worldSpace->set(false);
	addInputPort(m_worldSpace );

	m_jointId= -1;
	m_first = true;
}

JointConstraintOperator::~JointConstraintOperator()
{
}

bool JointConstraintOperator::compute()
{
	AtomsCore::Pose &inPose = m_inPose->getRef();
	if (inPose.numJoints() == 0)
	{
		AtomsUtils::Logger::warning() << "Empty input pose";
		return false;
	}


	AtomsCore::Pose &outPose = m_outPose->getRef();
	// Copy the input pose to the out pose port
	outPose = inPose;

	// Check if the agnet and the agent type are valid
	if (!m_agent) 
	{
		AtomsUtils::Logger::error() << "Invalid agent type";
		return false;
	}

	if(!m_agent->agentType())
	{
		AtomsUtils::Logger::error() << "Invalid agent type";
		return false;
	}

	// Get the skeleton from the agent type
	const AtomsCore::Skeleton& skeleton = m_agent->agentType()->skeleton();
	
	if (m_first)
	{
		m_jointId = skeleton.jointId(m_targetJoint->getRef());
	}

	if (m_jointId == -1)
	{
		Logger::error() << "Could not find constrained joint.";
		return false;
	}


	if (worldSpace->get())
	{
		// Compute the offset in world space
		AtomsCore::Poser poser(&skeleton);
		AtomsCore::Matrix currentMtx = poser.getWorldMatrix(pose, jointId);
		poser.setWorldMatrix(pose, m_offsetMatrix->getRef()* currentMtx, jointIdTmp);
	}
	else
	{
		// Compute the offset in local space		
		AtomsCore::JointPose& jp = outPose.jointPose(m_jointId);
		jp.setMatrix(m_offsetMatrix->getRef() * jp.matrix());
	}
	return true;
}