Multigesture shine-a-light

I’d like to manage multigestures, as described here.
Event is:

/// Pinch/rotate multi-finger touch gesture motion update.
URHO3D_EVENT(E_MULTIGESTURE, MultiGesture)
{
URHO3D_PARAM(P_CENTERX, CenterX); // int
URHO3D_PARAM(P_CENTERY, CenterY); // int
URHO3D_PARAM(P_NUMFINGERS, NumFingers); // int
URHO3D_PARAM(P_DTHETA, DTheta); // float (degrees)
URHO3D_PARAM(P_DDIST, DDist); // float
}

so I suppose it’s the usual:

void AnimatingScene::SubscribeToEvents()
{
SubscribeToEvent(E_GESTURERECORDED, URHO3D_HANDLER(AnimatingScene, HandleGesture));
}

and finally:

void AnimatingScene::HandleGesture(StringHash eventType, VariantMap& eventData)
{
using namespace MultiGesture;

MultiGesture::P_DDIST pdist = (MultiGesture)eventData[MultiGesture::???.getSomekindofdata???WTF
opaquetypes???;
}

I cannot figure what is the cast exactly and how to relate it to the event data…
Thank you

void AnimatingScene::HandleGesture(StringHash eventType, VariantMap& eventData)
{
       int centerX = eventData[P_CENTERX].GetInt();
       int centerY =  eventData[P_CENTERY].GetInt();
       float numFingers =  eventData[P_NUMFINGERS].GetFloat();
       // And so on...
}