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/*=========================================================================
Program: Visualization Toolkit
Module: vtkDashedStreamLine.cxx
Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
All rights reserved.
See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notice for more information.
=========================================================================*/
#include "vtkDashedStreamLine.h"
#ifndef VTK_LEGACY_REMOVE
#include "vtkCellArray.h"
#include "vtkDataSet.h"
#include "vtkFloatArray.h"
#include "vtkInformation.h"
#include "vtkInformationVector.h"
#include "vtkObjectFactory.h"
#include "vtkPointData.h"
#include "vtkPolyData.h"
vtkStandardNewMacro(vtkDashedStreamLine);
vtkDashedStreamLine::vtkDashedStreamLine()
{
this->DashFactor = 0.75;
VTK_LEGACY_BODY(vtkDashedStreamLine::vtkDashedStreamLine, "VTK 6.3");
}
int vtkDashedStreamLine::RequestData(vtkInformation *,
vtkInformationVector **inputVector,
vtkInformationVector *outputVector)
{
vtkInformation *inInfo = inputVector[0]->GetInformationObject(0);
vtkInformation *outInfo = outputVector->GetInformationObject(0);
vtkInformation *sourceInfo = inputVector[1]->GetInformationObject(0);
vtkStreamer::StreamPoint *sPrev, *sPtr;
vtkPoints *newPts;
vtkFloatArray *newVectors;
vtkFloatArray *newScalars=NULL;
vtkCellArray *newLines;
int i, ptId, j;
vtkIdType pts[2];
double tOffset, x[3], v[3], r, xPrev[3], vPrev[3], scalarPrev;
double s = 0;
double xEnd[3], vEnd[3], sEnd;
vtkDataSet *input = vtkDataSet::SafeDownCast(
inInfo->Get(vtkDataObject::DATA_OBJECT()));
vtkPolyData *output = vtkPolyData::SafeDownCast(
outInfo->Get(vtkDataObject::DATA_OBJECT()));
vtkDataSet *source = 0;
if (sourceInfo)
{
source = vtkDataSet::SafeDownCast(
sourceInfo->Get(vtkDataObject::DATA_OBJECT()));
}
this->SavePointInterval = this->StepLength;
this->vtkStreamer::Integrate(input, source);
if ( this->NumberOfStreamers <= 0 )
{
return 1;
}
//
// Convert streamer into lines. Lines may be dashed.
//
newPts = vtkPoints::New();
newPts->Allocate(1000);
newVectors = vtkFloatArray::New();
newVectors->SetNumberOfComponents(3);
newVectors->Allocate(1000);
if ( input->GetPointData()->GetScalars() || this->SpeedScalars )
{
newScalars = vtkFloatArray::New();
newScalars->Allocate(1000);
}
newLines = vtkCellArray::New();
newLines->Allocate(newLines->EstimateSize(2*this->NumberOfStreamers,VTK_CELL_SIZE));
//
// Loop over all streamers generating points
//
for (ptId=0; ptId < this->NumberOfStreamers; ptId++)
{
if ( this->Streamers[ptId].GetNumberOfPoints() < 2 )
{
continue;
}
sPrev = this->Streamers[ptId].GetStreamPoint(0);
sPtr = this->Streamers[ptId].GetStreamPoint(1);
for (j=0; j<3; j++)
{
xPrev[j] = sPrev->x[j];
vPrev[j] = sPrev->v[j];
}
scalarPrev = sPrev->s;
if ( this->Streamers[ptId].GetNumberOfPoints() == 2 && sPtr->cellId < 0 )
{
continue;
}
tOffset = sPrev->t;
for ( i=1;
i < this->Streamers[ptId].GetNumberOfPoints() && sPtr->cellId >= 0;
i++, sPrev=sPtr, sPtr=this->Streamers[ptId].GetStreamPoint(i) )
{
//
// Search for end of dash...create end of one dash, beginning of next
//
while ( tOffset >= sPrev->t && tOffset < sPtr->t )
{
r = (tOffset - sPrev->t) / (sPtr->t - sPrev->t);
for (j=0; j<3; j++)
{
x[j] = sPrev->x[j] + r * (sPtr->x[j] - sPrev->x[j]);
v[j] = sPrev->v[j] + r * (sPtr->v[j] - sPrev->v[j]);
xEnd[j] = xPrev[j] + this->DashFactor * (x[j] - xPrev[j]);
vEnd[j] = vPrev[j] + this->DashFactor * (v[j] - vPrev[j]);
}
// create this dash
pts[0] = newPts->InsertNextPoint(x);
newVectors->InsertTuple(pts[0],v);
pts[1] = newPts->InsertNextPoint(xEnd);
newVectors->InsertTuple(pts[1],vEnd);
if ( newScalars )
{
s = sPrev->s + r * (sPtr->s - sPrev->s);
newScalars->InsertTuple(pts[0],&s);
sEnd = scalarPrev + this->DashFactor * (s - scalarPrev);
newScalars->InsertTuple(pts[1],&sEnd);
}
newLines->InsertNextCell(2,pts);
for (j=0; j<3; j++)
{
xPrev[j] = x[j];
vPrev[j] = v[j];
}
if ( newScalars )
{
scalarPrev = s;
}
tOffset += this->StepLength;
} // while
} //for this streamer
} //for all streamers
//
// Update ourselves and release memory
//
vtkDebugMacro(<<"Created " << newPts->GetNumberOfPoints() << " points, "
<< newLines->GetNumberOfCells() << " lines");
output->SetPoints(newPts);
newPts->Delete();
output->GetPointData()->SetVectors(newVectors);
newVectors->Delete();
if ( newScalars )
{
int idx = output->GetPointData()->AddArray(newScalars);
output->GetPointData()->SetActiveAttribute(idx,
vtkDataSetAttributes::SCALARS);
newScalars->Delete();
}
output->SetLines(newLines);
newLines->Delete();
// Delete the streamers since they are no longer needed
delete[] this->Streamers;
this->Streamers = 0;
this->NumberOfStreamers = 0;
output->Squeeze();
return 1;
}
void vtkDashedStreamLine::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os,indent);
os << indent << "Dash Factor: " << this->DashFactor << " <<\n";
}
#endif // VTK_LEGACY_REMOVE
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