FWME0SegmentProxyBuilder.cc

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#include "TEveGeoNode.h"
#include "TEveGeoShape.h"
#include "TEveStraightLineSet.h"
#include "TGeoArb8.h"
#include "TEvePointSet.h"

#include "Fireworks/Core/interface/FWSimpleProxyBuilderTemplate.h"
#include "Fireworks/Core/interface/FWEventItem.h"
#include "Fireworks/Core/interface/FWGeometry.h"
#include "Fireworks/Core/interface/fwLog.h"

#include "DataFormats/GEMRecHit/interface/ME0SegmentCollection.h"

class FWME0SegmentProxyBuilder : public FWSimpleProxyBuilderTemplate<ME0Segment> {
public:
  FWME0SegmentProxyBuilder(void) {}
  ~FWME0SegmentProxyBuilder(void) override {}

  REGISTER_PROXYBUILDER_METHODS();

  FWME0SegmentProxyBuilder(const FWME0SegmentProxyBuilder&) = delete;
  const FWME0SegmentProxyBuilder& operator=(const FWME0SegmentProxyBuilder&) = delete;

private:
  void build(const ME0Segment& iData, unsigned int iIndex, TEveElement& oItemHolder, const FWViewContext*) override;
};

void FWME0SegmentProxyBuilder::build(const ME0Segment& iData,
                                     unsigned int iIndex,
                                     TEveElement& oItemHolder,
                                     const FWViewContext*) {
  const FWGeometry* geom = item()->getGeom();
  unsigned int rawid = iData.me0DetId().rawId();

  if (!geom->contains(rawid)) {
    fwLog(fwlog::kError) << "failed to get geometry of ME0 chamber with rawid: " << rawid << std::endl;
    return;
  }

  TEveStraightLineSet* segmentSet = new TEveStraightLineSet();
  // FIXME: This should be set elsewhere.
  segmentSet->SetLineWidth(5);
  setupAddElement(segmentSet, &oItemHolder);

  TEveGeoShape* shape = item()->getGeom()->getEveShape(rawid);
  if (shape) {
    if (TGeoBBox* box = dynamic_cast<TGeoBBox*>(shape->GetShape())) {
      LocalPoint pos = iData.localPosition();
      LocalVector dir = iData.localDirection();
      LocalVector unit = dir.unit();

      double localPosition[3] = {pos.x(), pos.y(), pos.z()};
      double localDirectionIn[3] = {dir.x(), dir.y(), dir.z()};
      double localDirectionOut[3] = {-dir.x(), -dir.y(), -dir.z()};

      Double_t distIn = box->DistFromInside(localPosition, localDirectionIn);
      Double_t distOut = box->DistFromInside(localPosition, localDirectionOut);
      LocalVector vIn = unit * distIn;
      LocalVector vOut = -unit * distOut;
      float localSegmentInnerPoint[3] = {static_cast<float>(localPosition[0] + vIn.x()),
                                         static_cast<float>(localPosition[1] + vIn.y()),
                                         static_cast<float>(localPosition[2] + vIn.z())};

      float localSegmentOuterPoint[3] = {static_cast<float>(localPosition[0] + vOut.x()),
                                         static_cast<float>(localPosition[1] + vOut.y()),
                                         static_cast<float>(localPosition[2] + vOut.z())};

      float globalSegmentInnerPoint[3];
      float globalSegmentOuterPoint[3];

      geom->localToGlobal(
          rawid, localSegmentInnerPoint, globalSegmentInnerPoint, localSegmentOuterPoint, globalSegmentOuterPoint);

      segmentSet->AddLine(globalSegmentInnerPoint[0],
                          globalSegmentInnerPoint[1],
                          globalSegmentInnerPoint[2],
                          globalSegmentOuterPoint[0],
                          globalSegmentOuterPoint[1],
                          globalSegmentOuterPoint[2]);

      // Draw hits included in the segment
      TEvePointSet* pointSet = new TEvePointSet;
      // FIXME: This should be set elsewhere.
      pointSet->SetMarkerSize(0.5);
      pointSet->SetMarkerColor(1);
      setupAddElement(pointSet, &oItemHolder);
      auto recHits = iData.specificRecHits();
      for (auto rh = recHits.begin(); rh != recHits.end(); rh++) {
        auto me0id = rh->me0Id();
        LocalPoint hpos = rh->localPosition();
        float hitLocalPos[3] = {hpos.x(), hpos.y(), hpos.z()};
        float hitGlobalPoint[3];
        geom->localToGlobal(me0id, hitLocalPos, hitGlobalPoint);
        pointSet->SetNextPoint(hitGlobalPoint[0], hitGlobalPoint[1], hitGlobalPoint[2]);
      }
    }
  }
}

REGISTER_FWPROXYBUILDER(FWME0SegmentProxyBuilder,
                        ME0Segment,
                        "ME0-segments",
                        FWViewType::kAll3DBits | FWViewType::kAllRPZBits);