File size: 6,204 Bytes
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/***************************************************************************
* Copyright (c) 2025 Stefan Tröger <stefantroeger@gmx.net> *
* *
* This file is part of FreeCAD. *
* *
* FreeCAD is free software: you can redistribute it and/or modify it *
* under the terms of the GNU Lesser General Public License as *
* published by the Free Software Foundation, either version 2.1 of the *
* License, or (at your option) any later version. *
* *
* FreeCAD is distributed in the hope that it will be useful, but *
* WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
* Lesser General Public License for more details. *
* *
* You should have received a copy of the GNU Lesser General Public *
* License along with FreeCAD. If not, see *
* <https://www.gnu.org/licenses/>. *
* *
**************************************************************************/
#include "PreCompiled.h"
#ifndef _PreComp_
# include <cmath>
# include <algorithm>
# include <iterator>
# include <vector>
# include <vtkUnstructuredGrid.h>
# include <vtkMultiBlockDataSet.h>
# include <vtkFieldData.h>
# include <vtkStreamingDemandDrivenPipeline.h>
# include <vtkFloatArray.h>
# include <vtkInformation.h>
# include <vtkInformationVector.h>
#endif
#include "vtkFemFrameSourceAlgorithm.h"
using namespace Fem;
vtkStandardNewMacro(vtkFemFrameSourceAlgorithm);
vtkFemFrameSourceAlgorithm::vtkFemFrameSourceAlgorithm()
{
// we are a source
SetNumberOfInputPorts(0);
SetNumberOfOutputPorts(1);
}
vtkFemFrameSourceAlgorithm::~vtkFemFrameSourceAlgorithm() = default;
void vtkFemFrameSourceAlgorithm::setDataObject(vtkSmartPointer<vtkDataObject> data)
{
m_data = data;
Modified();
Update();
}
bool vtkFemFrameSourceAlgorithm::isValid()
{
return m_data.GetPointer() ? true : false;
}
std::vector<double> vtkFemFrameSourceAlgorithm::getFrameValues()
{
// check if we have frame data
if (!m_data || !m_data->IsA("vtkMultiBlockDataSet")) {
return std::vector<double>();
}
// we have multiple frames! let's check the amount and times
vtkSmartPointer<vtkMultiBlockDataSet> multiblock = vtkMultiBlockDataSet::SafeDownCast(m_data);
unsigned long nblocks = multiblock->GetNumberOfBlocks();
std::vector<double> tFrames(nblocks);
for (unsigned long i = 0; i < nblocks; i++) {
vtkDataObject* block = multiblock->GetBlock(i);
// check if the TimeValue field is available
if (!block->GetFieldData()->HasArray("TimeValue")) {
// a frame with no valid value is a undefined state
return std::vector<double>();
}
// store the time value!
vtkDataArray* TimeValue = block->GetFieldData()->GetArray("TimeValue");
if (!TimeValue->IsA("vtkFloatArray") || TimeValue->GetNumberOfTuples() < 1) {
// a frame with no valid value is a undefined state
return std::vector<double>();
}
tFrames[i] = vtkFloatArray::SafeDownCast(TimeValue)->GetValue(0);
}
return tFrames;
}
int vtkFemFrameSourceAlgorithm::RequestInformation(
vtkInformation* reqInfo,
vtkInformationVector** inVector,
vtkInformationVector* outVector
)
{
// setup default information
if (!this->Superclass::RequestInformation(reqInfo, inVector, outVector)) {
return 0;
}
if (!m_data) {
// for the no data case we would return a empty data set in RequestData.
return 1;
}
std::vector<double> frames = getFrameValues();
if (frames.empty()) {
// no frames, default info is sufficient
return 1;
}
double tRange[2] = {frames.front(), frames.back()};
// finally set the time info!
vtkInformation* info = outVector->GetInformationObject(0);
info->Set(vtkStreamingDemandDrivenPipeline::TIME_RANGE(), tRange, 2);
info->Set(vtkStreamingDemandDrivenPipeline::TIME_STEPS(), &frames[0], frames.size());
info->Set(CAN_HANDLE_PIECE_REQUEST(), 1);
return 1;
}
int vtkFemFrameSourceAlgorithm::RequestData(
vtkInformation*,
vtkInformationVector**,
vtkInformationVector* outVector
)
{
vtkInformation* outInfo = outVector->GetInformationObject(0);
vtkUnstructuredGrid* output = vtkUnstructuredGrid::SafeDownCast(
outInfo->Get(vtkDataObject::DATA_OBJECT())
);
if (!output) {
return 0;
}
if (!m_data) {
outInfo->Set(vtkDataObject::DATA_OBJECT(), vtkUnstructuredGrid::New());
return 1;
}
if (!m_data->IsA("vtkMultiBlockDataSet")) {
// no multi frame data, return directly
outInfo->Set(vtkDataObject::DATA_OBJECT(), m_data);
return 1;
}
vtkSmartPointer<vtkMultiBlockDataSet> multiblock = vtkMultiBlockDataSet::SafeDownCast(m_data);
// find the block asked for (lazy implementation)
unsigned long idx = 0;
if (outInfo->Has(vtkStreamingDemandDrivenPipeline::UPDATE_TIME_STEP())) {
auto time = outInfo->Get(vtkStreamingDemandDrivenPipeline::UPDATE_TIME_STEP());
auto frames = getFrameValues();
// we have float values, so be aware of rounding errors. lets subtract the searched time and
// then use the smallest value
for (auto& frame : frames) {
frame = std::abs(frame - time);
}
auto it = std::ranges::min_element(frames);
idx = std::distance(frames.begin(), it);
}
auto block = multiblock->GetBlock(idx);
output->ShallowCopy(block);
return 1;
}
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