replace direct usage of SimulationArea by iterateOver()

Device/Detector/IDetector2D.cpp

@@ -17,7 +17,6 @@
 #include "Base/Pixel/SimulationElement.h"
 #include "Device/Beam/Beam.h"
 #include "Device/Detector/DetectorContext.h"
-#include "Device/Detector/SimulationArea.h"
 #include "Device/Mask/InfinitePlane.h"
 #include "Device/ProDetector/RegionOfInterest.h"
 
@@ -60,9 +59,9 @@ void IDetector2D::resetRegionOfInterest()
 std::vector<size_t> IDetector2D::active_indices() const
 {
     std::vector<size_t> result;
-    SimulationArea area(this);
-    for (SimulationArea::iterator it = area.begin(); it != area.end(); ++it)
-        result.push_back(it.detectorIndex());
+
+    iterateOverNonMaskedPoints([&](const_iterator it) { result.push_back(it.detectorIndex()); });
+
     return result;
 }