Changeset f84241 for src/Fragmentation/Summation/SetValues/SamplingGrid.cpp

Timestamp:

Jun 8, 2016, 9:04:17 PM (9 years ago)

Author:

Frederik Heber <heber@…>

Children:

e34888

Parents:

a5d4c3

git-author:

Frederik Heber <heber@…> (06/01/16 08:51:01)

git-committer:

Frederik Heber <heber@…> (06/08/16 21:04:17)

Message:

WindowGrid_converter's refactored a bit with getDiscreteWindowOffsets().

• Added SamplingGrid::getDiscreteWindowOffsets().
• WindowGrid_converter now also use NDIM instead of 3 to clarify the use of the spatial degrees of freedom (and not some grid level or else).

File:

• src/Fragmentation/Summation/SetValues/SamplingGrid.cpp (modified) (1 diff)

src/Fragmentation/Summation/SetValues/SamplingGrid.cpp

@@ -452 +452 @@
     ASSERT( (_wend[index] - _wbegin[index]) == _wlength[index],
         "SamplingGrid::getDiscreteWindowCopyIndices() - end - begin is not equal to length for "
+        +toString(index)+"th component.");
+  }
+}
+
+void SamplingGrid::getDiscreteWindowOffsets(
+    size_t _pre_offset[NDIM],
+    size_t _post_offset[NDIM],
+    size_t _length[NDIM],
+    size_t _total[NDIM]) const
+{
+  const double round_offset =
+      (std::numeric_limits<size_t>::round_style == std::round_toward_zero) ?
+          0.5 : 0.; // need offset to get to round_toward_nearest behavior
+  for(size_t index=0;index<NDIM;++index) {
+    if (fabs(end[index] - begin[index]) > std::numeric_limits<double>::epsilon()*1e4) {
+      // we refrain from using floor/ceil as the window's starts and ends,
+      // the grids have to be compatible (equal level), should always be on
+      // discrete grid point locations.
+      const double delta = getDeltaPerAxis(index);
+      // delta is conversion factor from box length to discrete length, i.e. number of points
+      _pre_offset[index] = (begin_window[index] - begin[index])/delta+round_offset;
+      _post_offset[index] = (end[index] - end_window[index])/delta+round_offset;
+      _length[index] = (end_window[index] - begin_window[index])/delta+round_offset;
+      _total[index] = (end[index] - begin[index])/delta+round_offset;
+    } else {
+      _pre_offset[index] = 0;
+      _post_offset[index] = 0;
+      _length[index] = 0;
+      _total[index] = 0;
+    }
+    // total is used as safe-guard against loss due to discrete conversion
+    ASSERT( (_pre_offset[index] + _post_offset[index]) + _length[index] == _total[index],
+        "SamplingGrid::getDiscreteWindowCopyIndices() - pre, length, post are not equal to total for "
         +toString(index)+"th component.");
   }