mirror of
https://gitlab.kitware.com/vtk/vtk-m
synced 2024-09-19 02:25:42 +00:00
96 lines
3.3 KiB
C++
96 lines
3.3 KiB
C++
//============================================================================
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// Copyright (c) Kitware, Inc.
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// All rights reserved.
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// See LICENSE.txt for details.
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//
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// This software is distributed WITHOUT ANY WARRANTY; without even
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// the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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// PURPOSE. See the above copyright notice for more information.
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//============================================================================
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#include <vtkm/io/VTKRectilinearGridReader.h>
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namespace vtkm
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{
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namespace io
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{
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VTKRectilinearGridReader::VTKRectilinearGridReader(const char* fileName)
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: VTKDataSetReaderBase(fileName)
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{
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}
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VTKRectilinearGridReader::VTKRectilinearGridReader(const std::string& fileName)
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: VTKDataSetReaderBase(fileName)
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{
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}
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void VTKRectilinearGridReader::Read()
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{
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if (this->DataFile->Structure != vtkm::io::internal::DATASET_RECTILINEAR_GRID)
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throw vtkm::io::ErrorIO("Incorrect DataSet type");
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//We need to be able to handle VisIt files which dump Field data
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//at the top of a VTK file
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std::string tag;
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this->DataFile->Stream >> tag;
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if (tag == "FIELD")
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{
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this->ReadGlobalFields();
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this->DataFile->Stream >> tag;
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}
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// Read structured grid specific meta-data
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internal::parseAssert(tag == "DIMENSIONS");
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vtkm::Id3 dim;
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this->DataFile->Stream >> dim[0] >> dim[1] >> dim[2] >> std::ws;
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//Read the points.
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std::string dataType;
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std::size_t numPoints[3];
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vtkm::cont::VariantArrayHandle X, Y, Z;
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// Always read coordinates as vtkm::FloatDefault
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std::string readDataType = vtkm::io::internal::DataTypeName<vtkm::FloatDefault>::Name();
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this->DataFile->Stream >> tag >> numPoints[0] >> dataType >> std::ws;
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if (tag != "X_COORDINATES")
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throw vtkm::io::ErrorIO("X_COORDINATES tag not found");
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X = this->DoReadArrayVariant(vtkm::cont::Field::Association::ANY, readDataType, numPoints[0], 1);
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this->DataFile->Stream >> tag >> numPoints[1] >> dataType >> std::ws;
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if (tag != "Y_COORDINATES")
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throw vtkm::io::ErrorIO("Y_COORDINATES tag not found");
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Y = this->DoReadArrayVariant(vtkm::cont::Field::Association::ANY, readDataType, numPoints[1], 1);
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this->DataFile->Stream >> tag >> numPoints[2] >> dataType >> std::ws;
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if (tag != "Z_COORDINATES")
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throw vtkm::io::ErrorIO("Z_COORDINATES tag not found");
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Z = this->DoReadArrayVariant(vtkm::cont::Field::Association::ANY, readDataType, numPoints[2], 1);
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if (dim != vtkm::Id3(static_cast<vtkm::Id>(numPoints[0]),
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static_cast<vtkm::Id>(numPoints[1]),
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static_cast<vtkm::Id>(numPoints[2])))
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throw vtkm::io::ErrorIO("DIMENSIONS not equal to number of points");
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vtkm::cont::ArrayHandleCartesianProduct<vtkm::cont::ArrayHandle<vtkm::FloatDefault>,
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vtkm::cont::ArrayHandle<vtkm::FloatDefault>,
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vtkm::cont::ArrayHandle<vtkm::FloatDefault>>
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coords;
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vtkm::cont::ArrayHandle<vtkm::FloatDefault> Xc, Yc, Zc;
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X.CopyTo(Xc);
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Y.CopyTo(Yc);
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Z.CopyTo(Zc);
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coords = vtkm::cont::make_ArrayHandleCartesianProduct(Xc, Yc, Zc);
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vtkm::cont::CoordinateSystem coordSys("coordinates", coords);
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this->DataSet.AddCoordinateSystem(coordSys);
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this->DataSet.SetCellSet(internal::CreateCellSetStructured(dim));
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// Read points and cell attributes
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this->ReadAttributes();
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}
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}
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} // namespace vtkm::io
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