multi-point…

locomotive.hh
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			using namespace akantu;

			/* -------------------------------------------------------------------------- */
			void applyRotation(Array<Real> center, Real angle, Array<Real> & nodes,
			Array<Real> * displacement, Array<UInt> node_group) {

			for (UInt i = 0; i < node_group.getSize(); ++i) {

			Array<Real> pos_rel(center.getSize());

			for (UInt j = 0; j < center.getSize(); ++j) {

			pos_rel(j) = nodes(node_group(i),j) - center(j);
			}

			Real radius = std::sqrt(pos_rel[0]pos_rel[0]+pos_rel[1]pos_rel[1]);

			if (std::abs(radius) < Math::getTolerance()) continue;

			Real phi_i = std::acos(pos_rel[0]/radius);

			if (pos_rel[1] < 0) phi_i *= -1;

			(displacement)(node_group(i),0) = std::cos(phi_i-angle)radius - pos_rel[0];
			(displacement)(node_group(i),1) = std::sin(phi_i-angle)radius - pos_rel[1];
			}
			}