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124 lines
3.4 KiB
124 lines
3.4 KiB
/*=========================================================================
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Program: Visualization Toolkit
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Module: $RCSfile: vtkSimpleElevationFilter.cxx,v $
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Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
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All rights reserved.
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See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
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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 "vtkSimpleElevationFilter.h"
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#include "vtkCellData.h"
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#include "vtkDataSet.h"
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#include "vtkFloatArray.h"
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#include "vtkInformation.h"
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#include "vtkInformationVector.h"
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#include "vtkMath.h"
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#include "vtkObjectFactory.h"
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#include "vtkPointData.h"
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vtkCxxRevisionMacro(vtkSimpleElevationFilter, "$Revision: 1.20 $");
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vtkStandardNewMacro(vtkSimpleElevationFilter);
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// Construct object with LowPoint=(0,0,0) and HighPoint=(0,0,1). Scalar
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// range is (0,1).
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vtkSimpleElevationFilter::vtkSimpleElevationFilter()
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{
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this->Vector[0] = 0.0;
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this->Vector[1] = 0.0;
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this->Vector[2] = 1.0;
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}
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// Convert position along ray into scalar value. Example use includes
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// coloring terrain by elevation.
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//
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int vtkSimpleElevationFilter::RequestData(
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vtkInformation *vtkNotUsed(request),
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vtkInformationVector **inputVector,
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vtkInformationVector *outputVector)
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{
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// get the info objects
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vtkInformation *inInfo = inputVector[0]->GetInformationObject(0);
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vtkInformation *outInfo = outputVector->GetInformationObject(0);
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// get the input and ouptut
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vtkDataSet *input = vtkDataSet::SafeDownCast(
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inInfo->Get(vtkDataObject::DATA_OBJECT()));
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vtkDataSet *output = vtkDataSet::SafeDownCast(
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outInfo->Get(vtkDataObject::DATA_OBJECT()));
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vtkIdType i, numPts;
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vtkFloatArray *newScalars;
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double s, x[3];
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// Initialize
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//
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vtkDebugMacro(<<"Generating elevation scalars!");
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// First, copy the input to the output as a starting point
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output->CopyStructure( input );
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if ( ((numPts=input->GetNumberOfPoints()) < 1) )
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{
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vtkDebugMacro(<< "No input!");
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return 1;
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}
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// Allocate
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//
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newScalars = vtkFloatArray::New();
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newScalars->SetNumberOfTuples(numPts);
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// Set up 1D parametric system
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//
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if ( vtkMath::Dot(this->Vector,this->Vector) == 0.0)
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{
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vtkErrorMacro(<< "Bad vector, using (0,0,1)");
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this->Vector[0] = this->Vector[1] = 0.0; this->Vector[2] = 1.0;
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}
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// Compute dot product
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//
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int abort=0;
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vtkIdType progressInterval=numPts/20 + 1;
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for (i=0; i<numPts && !abort; i++)
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{
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if ( ! (i % progressInterval) )
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{
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this->UpdateProgress ((double)i/numPts);
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abort = this->GetAbortExecute();
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}
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input->GetPoint(i,x);
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s = vtkMath::Dot(this->Vector,x);
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newScalars->SetComponent(i,0,s);
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}
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// Update self
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//
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output->GetPointData()->CopyScalarsOff();
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output->GetPointData()->PassData(input->GetPointData());
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output->GetCellData()->PassData(input->GetCellData());
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newScalars->SetName("Elevation");
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output->GetPointData()->AddArray(newScalars);
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output->GetPointData()->SetActiveScalars(newScalars->GetName());
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newScalars->Delete();
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return 1;
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}
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void vtkSimpleElevationFilter::PrintSelf(ostream& os, vtkIndent indent)
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{
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this->Superclass::PrintSelf(os,indent);
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os << indent << "Vector: (" << this->Vector[0] << ", "
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<< this->Vector[1] << ", " << this->Vector[2] << ")\n";
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}
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