PerpendicularBoundPlaneBuilder Class Reference

#include <PerpendicularBoundPlaneBuilder.h>

Public Member Functions
BoundPlane *	operator() (const Surface::GlobalPoint &origin, const Surface::GlobalVector &perp) const

Detailed Description

Constructs a plane perpendicular to an axis, and oriented in a special way. Must be updated for reference counting.

Definition at line 11 of file PerpendicularBoundPlaneBuilder.h.

Member Function Documentation

BoundPlane * PerpendicularBoundPlaneBuilder::operator()	(	const Surface::GlobalPoint &	origin,
		const Surface::GlobalVector &	perp
	)		const

Definition at line 5 of file PerpendicularBoundPlaneBuilder.cc.

References Vector3DBase< T, FrameTag >::cross(), makeMuonMisalignmentScenario::rot, Vector3DBase< T, FrameTag >::unit(), unit(), PV3DBase< T, PVType, FrameType >::x(), PV3DBase< T, PVType, FrameType >::y(), PV3DBase< T, PVType, FrameType >::z(), and MetAnalyzer::zAxis.

                                                                                              {
  // z axis coincides with perp
  GlobalVector zAxis = perp.unit();

  // x axis has no global Z component
  GlobalVector xAxis;
  if (zAxis.x() != 0 || zAxis.y() != 0) {
    // precision is not an issue here, just protect against divizion by zero
    xAxis = GlobalVector(-zAxis.y(), zAxis.x(), 0).unit();
  } else {  // perp coincides with global Z
    xAxis = GlobalVector(1, 0, 0);
  }

  // y axis obtained by cross product
  GlobalVector yAxis(zAxis.cross(xAxis));

  Surface::RotationType rot(
      xAxis.x(), xAxis.y(), xAxis.z(), yAxis.x(), yAxis.y(), yAxis.z(), zAxis.x(), zAxis.y(), zAxis.z());

  return new BoundPlane(origin, rot);
}