SimpleDiskBounds.cc

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#include "DataFormats/GeometrySurface/interface/SimpleDiskBounds.h"
#include "DataFormats/GeometrySurface/interface/LocalError.h"
#include <algorithm>
#include <cmath>

SimpleDiskBounds::SimpleDiskBounds(float rmin, float rmax, float zmin, float zmax)
    : theRmin(rmin), theRmax(rmax), theZmin(zmin), theZmax(zmax) {
  if (theRmin > theRmax)
    std::swap(theRmin, theRmax);
  if (theZmin > theZmax)
    std::swap(theZmin, theZmax);
}

bool SimpleDiskBounds::inside(const Local2DPoint& p, const LocalError& err) const { return Bounds::inside(p, err); }

Bounds* SimpleDiskBounds::clone() const { return new SimpleDiskBounds(*this); }

bool SimpleDiskBounds::inside(const Local3DPoint& p, const LocalError& err, float scale) const {
  if (p.z() < theZmin || p.z() > theZmax)
    return false;  // check the easy part first

  double perp2 = p.perp2();
  double perp = sqrt(perp2);
  if (perp2 == 0)
    return scale * scale * (err.xx() + err.xy()) > theRmin * theRmin;

  // rotated error along p.x(),p.y()
  // equivalent to (but faster than) err.rotate(p.x(),p.y()).xx()
  // since we don't need all matrix elements
  float deltaR = scale * sqrt(p.x() * p.x() / perp2 * err.xx() - 2 * p.x() * p.y() / perp2 * err.xy() +
                              p.y() * p.y() / perp2 * err.yy());
  return perp > std::max(theRmin - deltaR, 0.f) && perp < theRmax + deltaR;
}