mirror of
https://gitlab.kitware.com/vtk/vtk-m
synced 2024-09-08 13:23:51 +00:00
a17ebdf52a
The original design of the filter base class required several specialized base classes to control what information was pulled from the input `DataSet` and provided to the derived class. Since the filter base class was redesigned, the derived classes all get a `DataSet` and pull their own information from it. Thus, most specialized filter base classes became unnecessary and removed. The one substantial exception was the `FilterField`. This filter base class managed input and output arrays. This was kept separate from the base `Filter` because not all filters need the ability to select this information. That said, this separation has not been particularly helpful. There are several other features of `Filter` that does not apply to all subclasses. Furthermore, there are several derived filters that are using `FilterField` merely to pick a single part, like selecting a coordinate system, and ignoring the rest of the abilities. Thus, it makes more sense to deprecate `FilterField` and have these classes inherit directly from `Filter`.
115 lines
3.1 KiB
C++
115 lines
3.1 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/worklet/WorkletMapField.h>
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#include <vtkm/filter/Filter.h>
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#include <vtkm/io/VTKDataSetReader.h>
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#include <vtkm/io/VTKDataSetWriter.h>
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#include <vtkm/cont/Initialize.h>
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#include <vtkm/VectorAnalysis.h>
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#include <cstdlib>
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#include <iostream>
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namespace hello_worklet_example
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{
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struct HelloWorklet : public vtkm::worklet::WorkletMapField
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{
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using ControlSignature = void(FieldIn inVector, FieldOut outMagnitude);
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template <typename T>
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VTKM_EXEC void operator()(const vtkm::Vec<T, 3>& inVector, T& outMagnitude) const
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{
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outMagnitude = vtkm::Magnitude(inVector);
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}
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};
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} // namespace hello_worklet_example
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namespace vtkm
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{
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namespace filter
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{
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class HelloField : public vtkm::filter::Filter
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{
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public:
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VTKM_CONT vtkm::cont::DataSet DoExecute(const vtkm::cont::DataSet& inDataSet)
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{
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// Input field
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vtkm::cont::Field inField = this->GetFieldFromDataSet(inDataSet);
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// Holder for output
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vtkm::cont::UnknownArrayHandle outArray;
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hello_worklet_example::HelloWorklet mag;
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auto resolveType = [&](const auto& inputArray) {
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// use std::decay to remove const ref from the decltype of concrete.
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using T = typename std::decay_t<decltype(inputArray)>::ValueType::ComponentType;
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vtkm::cont::ArrayHandle<T> result;
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this->Invoke(mag, inputArray, result);
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outArray = result;
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};
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this->CastAndCallVecField<3>(inField, resolveType);
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std::string outFieldName = this->GetOutputFieldName();
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if (outFieldName.empty())
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{
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outFieldName = inField.GetName() + "_magnitude";
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}
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return this->CreateResultField(inDataSet, outFieldName, inField.GetAssociation(), outArray);
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}
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};
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}
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} // vtkm::filter
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int main(int argc, char** argv)
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{
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vtkm::cont::Initialize(argc, argv);
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if ((argc < 3) || (argc > 4))
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{
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std::cerr << "Usage: " << argv[0] << " in_data.vtk field_name [out_data.vtk]\n\n";
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std::cerr << "For example, you could use the simple_unstructured_bin.vtk that comes with the "
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"VTK-m source:\n\n";
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std::cerr
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<< " " << argv[0]
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<< " <path-to-vtkm-source>/data/data/unstructured/simple_unstructured_bin.vtk vectors\n";
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return 1;
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}
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std::string infilename = argv[1];
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std::string infield = argv[2];
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std::string outfilename = "out_data.vtk";
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if (argc == 4)
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{
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outfilename = argv[3];
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}
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vtkm::io::VTKDataSetReader reader(infilename);
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vtkm::cont::DataSet inputData = reader.ReadDataSet();
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vtkm::filter::HelloField helloField;
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helloField.SetActiveField(infield);
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vtkm::cont::DataSet outputData = helloField.Execute(inputData);
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vtkm::io::VTKDataSetWriter writer(outfilename);
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writer.WriteDataSet(outputData);
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return 0;
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}
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