WIP: start to port Chunxiu Liu's code to dd4hep.

Detector/DetEcalMatrix/CMakeLists.txt

+###############################################################################
+# Package: DetEcalMatrix 
+# Based on package: lcgeo
+################################################################################
+gaudi_subdir(DetEcalMatrix v0r0)
+
+gaudi_depends_on_subdirs(GaudiKernel)
+
+
+find_package(DD4hep COMPONENTS DDRec DDG4 DDParsers REQUIRED)
+find_package(Geant4)
+include(${Geant4_USE_FILE})
+
+set(CMAKE_MODULE_PATH  ${CMAKE_MODULE_PATH}  ${DD4hep_ROOT}/cmake )
+include( DD4hep )
+
+find_package(ROOT COMPONENTS MathCore GenVector Geom REQUIRED)
+
+install(DIRECTORY ${CMAKE_CURRENT_LIST_DIR}/compact DESTINATION Detector/DetEcalMatrix)
+
+set(DetEcalMatrix_src
+    src/calorimeter/EcalMatrix.cpp
+)
+
+gaudi_add_module(DetEcalMatrix
+                  ${DetEcalMatrix_src}
+		  INCLUDE_DIRS DD4hep ROOT Geant4 src/include
+		  LINK_LIBRARIES GaudiKernel DD4hep ${DD4hep_COMPONENT_LIBRARIES} ROOT Geant4)
+
+set(LIBRARY_OUTPUT_PATH ${CMAKE_LIBRARY_OUTPUT_DIRECTORY})
+message(STATUS "LIBRARY_OUTPUT_PATH -> ${LIBRARY_OUTPUT_PATH}")
+dd4hep_generate_rootmap(DetEcalMatrix)

Detector/DetEcalMatrix/compact/det.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<lccdd>
+ 
+  <info name="EcalMatrix"
+	title="Test with Chunxiu Liu's EcalMatrix"
+	author="Tao Lin"
+	url="http://cepcgit.ihep.ac.cn"
+	status="development"
+	version="v0">
+    <comment>Test with Chunxiu Liu's EcalMatrix</comment>        
+  </info>
+
+  <includes>
+    <gdmlFile  ref="${DD4hepINSTALL}/DDDetectors/compact/elements.xml"/>
+    <gdmlFile  ref="${DD4hepINSTALL}/DDDetectors/compact/materials.xml"/>
+  </includes>
+
+  <define>
+    <constant name="world_size" value="30*m"/>
+    <constant name="world_x" value="world_size"/>
+    <constant name="world_y" value="world_size"/>
+    <constant name="world_z" value="world_size"/>
+  </define>
+
+  <display>
+    <vis name="Invisible" showDaughters="false" visible="false"/>
+    <vis name="InvisibleWithChildren" showDaughters="true" visible="false"/>
+    <vis name="VisibleRed"  r="1.0" g="0.0" b="0.0" showDaughters="true" visible="true"/>
+    <vis name="VisibleBlue" r="0.0" g="0.0" b="1.0" showDaughters="false" visible="true"/>
+    <vis name="VisibleGreen" alpha="1.0" r="0.0" g="1.0" b="0.0" drawingStyle="solid" lineStyle="solid" showDaughters="true" visible="true"/>
+  </display>
+
+  <detectors>
+    <detector id="1" name="CaloDetector" type="EcalMatrix" readout="CaloHits" vis="VisibleGreen" sensitive="true">
+      <position x="0"  y="0"  z="1800*mm"/>
+    </detector>
+  </detectors>
+  
+  <readouts>
+    <readout name="CaloHits">
+      <id>system:8</id>
+    </readout>
+  </readouts>
+
+</lccdd>

Detector/DetEcalMatrix/src/calorimeter/EcalMatrix.cpp

+//====================================================================
+//  Detector description implementation for Chunxiu Liu's EcalMatrix
+//--------------------------------------------------------------------
+//
+//  Author     : Tao Lin
+//               Examples from lcgeo
+//                   lcgeo/detector/calorimeter/
+//
+//====================================================================
+#include "DD4hep/DetFactoryHelper.h"
+#include "XML/Layering.h"
+#include "XML/Utilities.h"
+#include "DDRec/DetectorData.h"
+#include "DDSegmentation/Segmentation.h"
+
+#define MYDEBUG(x) std::cout << __FILE__ << ":" << __LINE__ << ": " << x << std::endl;
+#define MYDEBUGVAL(x) std::cout << __FILE__ << ":" << __LINE__ << ": " << #x << ": " << x << std::endl;
+
+static dd4hep::Ref_t create_detector(dd4hep::Detector& theDetector,
+                                     xml_h e,
+                                     dd4hep::SensitiveDetector sens) {
+
+    xml_det_t x_det = e;
+
+    std::string det_name = x_det.nameStr();
+    std::string det_type = x_det.typeStr();
+    MYDEBUGVAL(det_name);
+    MYDEBUGVAL(det_type);
+    xml_dim_t   pos    (x_det.child(_U(position)));
+
+
+    dd4hep::DetElement sdet(det_name, x_det.id());
+
+    dd4hep::Volume motherVol = theDetector.pickMotherVolume(sdet);
+
+    dd4hep::Material det_mat(theDetector.material("Air"));
+    dd4hep::Volume det_vol(det_name+"_vol", dd4hep::Box(60, 60, 60), det_mat);
+
+    dd4hep::Transform3D transform(dd4hep::Rotation3D(),
+                                  dd4hep::Position(pos.x(),pos.y(),pos.z()));
+    dd4hep::PlacedVolume phv = motherVol.placeVolume(det_vol,transform);
+
+    if ( x_det.isSensitive() )   {
+        dd4hep::SensitiveDetector sd = sens;
+        det_vol.setSensitiveDetector(sens);
+        sd.setType("calorimeter");
+    }
+    if ( x_det.hasAttr(_U(id)) )  {
+        phv.addPhysVolID("system",x_det.id());
+    }
+    sdet.setPlacement(phv);
+    
+    MYDEBUG("create_detector DONE. ");
+    return sdet;
+}
+
+DECLARE_DETELEMENT(EcalMatrix, create_detector)