void mousePressEvent(QMouseEvent *e)
	{
		Cluster* cluster;
		switch (e->button())
		{
		case Qt::LeftButton:

			//...
			cluster = new Cluster(e->x(), e->y(), QColor(rand() % 255, rand() % 255, rand() % 255));
			computeCluster(cluster);
			clusters.push_back(cluster);

			update(); //redesenarea ferestrei (se apeleaza paintEvent())
			break;
		case Qt::RightButton:

			for (Cluster* c : clusters)
			{
				if ((c->x - 5 <= e->x() && e->x() <= c->x + 5) && (c->y - 5 <= e->y() && e->y() <= c->y + 5))
				{
					for (KPoint* p : c->kpoints)
					{
						p->parentCluster = nullptr;
					}

					clusters.erase(std::remove_if(clusters.begin(), clusters.end(), [&c](Cluster* kc) { return kc == c;}), clusters.end());
					break;
				}
			}

			for (Cluster* c : clusters)
			{
				computeCluster(c);
			}


			update();
			break;
		}
	}

	void computeCluster(Cluster* c)
	{

		for (auto &p : kpoints)
		{
			// First cluster
			if (p->parentCluster == nullptr)
			{
				c->kpoints.push_back(p);
				p->parentCluster = c;
			}
			else
			{
				// Second and so on...
				if (p->get_distance(p->parentCluster) > p->get_distance(c))
				{
					// https://www.fluentcpp.com/2018/09/18/how-to-remove-pointers-from-a-vector-in-cpp/
					p->parentCluster->kpoints.erase(std::remove_if(p->parentCluster->kpoints.begin(), p->parentCluster->kpoints.end(), [&p](KPoint* kp) { return kp == p;}), p->parentCluster->kpoints.end());
					c->kpoints.push_back(p);
					p->parentCluster = c;
				}
			}

		}
	}

	void keyPressEvent(QKeyEvent *e)
	{
		switch (e->key())
		{

		case Qt::Key_Space:

			for (Cluster *c : clusters)
			{
				if (c->kpoints.size() == 0)
					continue;

				int x = 0;
				int y = 0;
				for (KPoint *p : c->kpoints)
				{
					x += p->x;
					y += p->y;
				}

				c->x = x / c->kpoints.size();
				c->y = y / c->kpoints.size();

				computeCluster(c);
			}

			update();
			break;

		case Qt::Key_Escape:
			this->close();
		};
	}

};