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m_interactorAnimator->setOpacity(0); //not visible at first
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m_interactorItem->setBrush(Qt::green);
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connect(m_interactorItem, SIGNAL(clicked(int)), this, SLOT(activatorClicked(int))); //note that interactor item is over activator in hovered mode
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connect(m_interactorItem, SIGNAL(dragged(const QPointF&)), this, SLOT(interactorDragged(const QPointF&)));
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connect(m_interactorItem, SIGNAL(dragged(QPointF)), this, SLOT(interactorDragged(QPointF)));
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//initialize handle manager
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m_handleAnimator->setZValue(3);
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m_handleAnimator->setHideWhenInvisible(true);