How to Retrieve Specific Joint Position

example1.cpp

// Retrieve Joints
std::array<Joint, JointType::JointType_Count> joints;
ERROR_CHECK( body->GetJoints( JointType::JointType_Count, &joints[0] ) );

// Retrieve Specific Joint Position ( e.g. Left Hand )
const Joint joint = joints[JointType::JointType_HandLeft];
if( joint.TrackingState == TrackingState::TrackingState_Tracked ){
    const CameraSpacePoint position = joint.Position;
    const float x = position.X; // X coordinate (+/-1.0)
    const float y = position.Y; // Y coordinate (+/-1.0)
    const float z = position.Z; // Z coordinate (meters)
    std::cout << x << ", " << y << ", " << z << std::endl;
}

example2.cpp

// Retrieve Joints
std::array<Joint, JointType::JointType_Count> joints;
ERROR_CHECK( body->GetJoints( JointType::JointType_Count, &joints[0] ) );

// e.g. Convert Joint Position of Left Hand to Depth Space
{
    // Retrieve Specific Joint Position of Left Hand
    const Joint joint = joints[JointType::JointType_HandLeft];
    if( joint.TrackingState == TrackingState::TrackingState_Tracked ){
        // Convert Joint Position to Depth Space
        const CameraSpacePoint position = joint.Position;
        DepthSpacePoint point;
        ERROR_CHECK( coordinateMapper->MapCameraPointToDepthSpace( position, &point ) );
        
        // Joint Position in Depth Sapce
        const int x = static_cast<int>( point.X + 0.5f );
        const int y = static_cast<int>( point.Y + 0.5f );
        const float z = position.Z;
        if( ( 0 <= x ) && ( x < Width ) && ( 0 <= y ) && ( y < Height ) ){
             std::cout << "LeftHand : " << x << ", " << y << ", " << z << std::endl;
        }
    }
}

// e.g. Convert Joint Position of Right Hand to Depth Space
{
    // Retrieve Specific Joint Position of Right Hand
    const Joint joint = joints[JointType::JointType_HandRight];
    if( joint.TrackingState == TrackingState::TrackingState_Tracked ){
        // Convert Joint Position to Depth Space
        const CameraSpacePoint position = joint.Position;
        DepthSpacePoint point;
        ERROR_CHECK( coordinateMapper->MapCameraPointToDepthSpace( position, &point ) );
        
        // Joint Position in Depth Sapce
        const int x = static_cast<int>( point.X + 0.5f );
        const int y = static_cast<int>( point.Y + 0.5f );
        const float z = position.Z;
        if( ( 0 <= x ) && ( x < Width ) && ( 0 <= y ) && ( y < Height ) ){
             std::cout << "RightHand : " << x << ", " << y << ", " << z << std::endl;
        }
    }
}