Import Geant4 11.2.0 source tree

examples/advanced/stim_pixe_tomography/scripts/Extract_Projection.C

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+//***********************************************************************************************************
+// Extract_Slice.C
+// Root command file
+// Use it by typing in the command line of Root terminal: root Extract_Slice.C
+//
+//
+// More information is available in UserGuide
+// Created by Z.LI LP2i Bordeaux 2022
+//***********************************************************************************************************
+
+#include <math.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <string.h>
+
+#include <vector>
+// using namespace std;
+
+#define PI 3.14159265f
+
+// Define a structure to read and write each event in the required binary format
+struct PixeEvent
+{
+  uint16_t energy_10eV;
+  uint16_t pixelIndex;
+  uint16_t sliceIndex;
+  uint8_t projectionIndex;
+};
+
+// to extract a certain slice or slices
+
+void Extract_Projection()
+{
+  // FILE *in =fopen("PixeEvent_std_AtCreation.DAT","rb");
+  FILE* in = fopen("../build/PixeEvent_std_AtExit_Detector135_Aperture70.DAT", "rb");
+
+  // FILE* out = fopen("PixeEvent_std_AtCreation_50Projections.DAT","wb");
+  FILE* out = fopen("../build/PixeEvent_std_AtExit_Detector135_Aperture70_50Projections.DAT", "wb");
+
+  if (in == NULL) {
+    printf("error for opening the intput file\n");
+    return;
+  }
+
+  PixeEvent p;
+  PixeEvent pp;
+  vector<int> valid_projections;
+  for (int i = 0; i < 50; ++i) {
+    int p = 2 * i;
+    valid_projections.push_back(p);
+  }
+
+  while (fread(&p, 7, 1, in)) {
+    int key = p.projectionIndex;
+
+    if (std::find(valid_projections.begin(), valid_projections.end(), key)
+        != valid_projections.end()) {
+      pp.energy_10eV = p.energy_10eV;
+      pp.projectionIndex = p.projectionIndex / 2;
+      pp.sliceIndex = p.sliceIndex;  // index of slices should be reset, starting from 0
+      pp.pixelIndex = p.pixelIndex;
+      pp.pixelIndex = p.pixelIndex;
+      // printf("__ProjectionIndex=%d, SliceIndex=%d, PixelIndex=%d, Energy_10eV=%d\n",
+      // pp.projectionIndex, pp.sliceIndex, pp.pixelIndex, pp.energy_10eV);
+      fwrite(&pp, 7, 1, out);
+    }
+  }
+  fclose(in);
+  fclose(out);
+}