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/*=========================================================================
Program: Visualization Toolkit
Module: vtkContourValues.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 "vtkContourValues.h"
#include "vtkDoubleArray.h"
#include "vtkObjectFactory.h"
vtkStandardNewMacro(vtkContourValues);
// Construct object with a single contour value at 0.0.
vtkContourValues::vtkContourValues()
{
this->Contours = vtkDoubleArray::New();
this->Contours->Allocate(64);
this->Contours->InsertValue(0,0.0);
}
vtkContourValues::~vtkContourValues()
{
this->Contours->Delete();
}
// Set the ith contour value.
void vtkContourValues::SetValue(int i, double value)
{
int numContours=this->Contours->GetMaxId()+1;
i = (i < 0 ? 0 : i);
if ( i >= numContours || value != this->Contours->GetValue(i) )
{
this->Modified();
this->Contours->InsertValue(i,value);
}
}
// Get the ith contour value. The return value will be clamped if the
// index i is out of range.
double vtkContourValues::GetValue(int i)
{
i = (i < 0 ? 0 : i);
i = (i > this->Contours->GetMaxId() ? this->Contours->GetMaxId() : i);
return this->Contours->GetValue(i);
}
// Return a pointer to a list of contour values. The contents of the
// list will be garbage if the number of contours <= 0.
double *vtkContourValues::GetValues()
{
return this->Contours->GetPointer(0);
}
// Fill a supplied list with contour values. Make sure you've
// allocated memory of size GetNumberOfContours().
void vtkContourValues::GetValues(double *contourValues)
{
int i, numContours=this->Contours->GetMaxId()+1;
for ( i=0; i < numContours; i++ )
{
contourValues[i] = this->Contours->GetValue(i);
}
}
// Set the number of contours to place into the list. You only really
// need to use this method to reduce list size. The method SetValue()
// will automatically increase list size as needed.
void vtkContourValues::SetNumberOfContours(const int number)
{
int currentNumber = this->Contours->GetMaxId()+1;
int n = ( number < 0 ? 0 : number);
int i;
double *oldValues = NULL;
if ( n != currentNumber )
{
this->Modified();
// Keep a copy of the old values
if ( currentNumber > 0 )
{
oldValues = new double[currentNumber];
for ( i = 0; i < currentNumber; i++ )
{
oldValues[i] = this->Contours->GetValue(i);
}
}
this->Contours->SetNumberOfValues(n);
// Copy them back in since the array may have been re-allocated
if ( currentNumber > 0 )
{
int limit = (currentNumber < n)?(currentNumber):(n);
for ( i = 0; i < limit; i++ )
{
this->Contours->SetValue( i, oldValues[i] );
}
delete [] oldValues;
}
}
// Set the new contour values to 0.0
if (n > currentNumber)
{
for ( i = currentNumber; i < n; i++ )
{
this->Contours->SetValue (i, 0.0);
}
}
}
// Generate numContours equally spaced contour values between specified
// range. Contour values will include min/max range values.
void vtkContourValues::GenerateValues(int numContours, double rangeStart,
double rangeEnd)
{
double range[2];
range[0] = rangeStart;
range[1] = rangeEnd;
this->GenerateValues(numContours,range);
}
// Generate numContours equally spaced contour values between specified
// range. Contour values will include min/max range values.
void vtkContourValues::GenerateValues(int numContours, double range[2])
{
int i;
this->SetNumberOfContours(numContours);
if (numContours == 1)
{
this->SetValue(0, range[0]);
}
else
{
for (i= 0; i < numContours; ++i)
{
// no we cannot factorize the ratio
// (range[1] - range[0])/(numContours - 1) out of the loop.
// we want the whole expression to be evaluated on the FPU.
// see bug discussion: http://www.vtk.org/Bug/view.php?id=7887
this->SetValue(i, range[0] + i*(range[1] - range[0])/(numContours - 1));
}
}
}
// Return the number of contours in the
int vtkContourValues::GetNumberOfContours()
{
return this->Contours->GetMaxId()+1;
}
void vtkContourValues::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os, indent);
int i, numContours=this->Contours->GetMaxId() + 1;
os << indent << "Contour Values: \n";
for ( i=0; i < numContours; i++)
{
os << indent << " Value " << i << ": " << this->Contours->GetValue(i) << "\n";
}
}
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