added a monitoring service for pion reconstruction

reconstruction/ec/src/main/java/org/jlab/display/ec/ECRECMonitor.java

@@ -0,0 +1,71 @@
+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Class.java to edit this template
+ */
+package org.jlab.display.ec;
+
+import org.jlab.clas.physics.LorentzVector;
+import org.jlab.clas.reco.ReconstructionEngine;
+import org.jlab.groot.data.H1F;
+import org.jlab.groot.ui.TGCanvas;
+import org.jlab.io.base.DataBank;
+import org.jlab.io.base.DataEvent;
+
+/**
+ *
+ * @author gavalian
+ */
+public class ECRECMonitor extends ReconstructionEngine {
+    TGCanvas  canvas = null;
+    H1F       pion   = null;
+
+    public ECRECMonitor(){
+        super("ECMon","gavalian","1.0");
+    }
+
+    @Override
+    public boolean processDataEvent(DataEvent event) {
+        if(event.hasBank("REC::Particle")==true){
+            DataBank bank = event.getBank("REC::Particle");
+            int index1 = this.index(bank, 22, 0);
+            int index2 = this.index(bank, 22, 1);
+            LorentzVector vL_g1 = this.getVector(bank, index1, 0.0);
+            LorentzVector vL_g2 = this.getVector(bank, index2, 0.0);
+            if(vL_g1.p()>1.0&&vL_g2.p()>1.0){
+                vL_g1.add(vL_g2);
+                pion.fill(vL_g1.mass());
+            }
+        }
+        return true;
+    }
+
+    private LorentzVector getVector(DataBank b, int index, double mass){
+        LorentzVector v = new LorentzVector();
+        v.setPxPyPzM(b.getFloat("px", index),
+                b.getFloat("py", index),
+                b.getFloat("pz", index),
+                mass);
+        return v;
+    }
+
+    private int index(DataBank b, int pid, int skip){
+        int   nrows = b.rows();
+        int skipped = 0;
+        for(int r = 0; r < nrows; r++){
+            int id = b.getInt("pid", r);
+            if(id==pid){
+                if(skipped==skip) return r;
+                skipped++;
+            }
+        }
+        return -1; 
+    }
+    @Override
+    public boolean init() {
+        canvas = new TGCanvas("c","EC Engine Monitoring",500,500);
+        canvas.getCanvas().initTimer(5000);
+        pion = new H1F("pion",120,0.005,0.6);
+        return true;
+    }
+
+}