initial version of 3d DUNE event display

Author: mhlswang

.gitignore

@@ -14,3 +14,6 @@
 *.swo
 *.bin
 *.db
+*.cc.*
+*.h.*
+*.txt.*

duneana/EventDisplay3D/CMakeLists.txt

@@ -0,0 +1,24 @@
+include_directories( ${CMAKE_CURRENT_SOURCE_DIR} )
+
+art_make(BASENAME_ONLY
+   LIB_LIBRARIES
+    ${ROOT_CORE}
+    ${ROOT_EVE}
+    cetlib_except
+    cetlib::cetlib 
+    larcorealg_Geometry
+    lardataobj_RawData
+    art::Persistency_Common canvas
+   SERVICE_LIBRARIES
+    duneana_EventDisplay3D
+    ${ART_ROOT_IO_ROOTINPUT_SOURCE}
+   MODULE_LIBRARIES
+    nusimdata_SimulationBase
+    larreco_RecoAlg
+    duneana_EventDisplay3D
+    EvtDisplayService_service
+)
+
+install_headers()
+install_fhicl()
+install_source()

duneana/EventDisplay3D/EnsureTApplication.cc

@@ -0,0 +1,21 @@
+//
+//   If the ROOT interactive environment has NOT already been established,
+//   then the ROOT global variable gApplication is null.  Once the
+//   environment has been established, gApplication is non-null.
+//
+//   To create the environment, create an instance of TApplication.
+//   Doing this will set gApplication to a non-null value.
+//   It is ROOT's responsibility to delete the instance of TApplication
+//   at the end of the job. This code must not delete it.
+//
+
+#include "EnsureTApplication.h"
+
+#include "TApplication.h"
+
+dune::EnsureTApplication::EnsureTApplication(int argc, char** argv)
+{
+  if (!gApplication) {
+    new TApplication("noapplication", &argc, argv);
+  }
+}

duneana/EventDisplay3D/EnsureTApplication.h

@@ -0,0 +1,24 @@
+#ifndef EventDisplay3D_EnsureTApplication_h
+#define EventDisplay3D_EnsureTApplication_h
+//
+// If an art module wishes to open a TCanvas on the screen
+// then the interactive ROOT environment must be created.  However
+// it must only be created once per art job.
+//
+// The purpose of this class is to check to see if that environment
+// has been created.  If it has, do nothing.  If it has not, create it.
+//
+
+namespace dune {
+
+  class EnsureTApplication {
+
+  public:
+    explicit EnsureTApplication(int argc = 0, char** argv = nullptr);
+
+  private:
+  };
+
+} // end namespace dune
+
+#endif /* Analyzers_EnsureTApplication_h */