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/*=========================================================================
Program: Visualization Toolkit
Module: $RCSfile: vtkTriangularTexture.cxx,v $
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 "vtkTriangularTexture.h"
#include "vtkImageData.h"
#include "vtkMath.h"
#include "vtkInformation.h"
#include "vtkInformationVector.h"
#include "vtkObjectFactory.h"
#include "vtkStreamingDemandDrivenPipeline.h"
#include "vtkPointData.h"
#include "vtkUnsignedCharArray.h"
vtkCxxRevisionMacro(vtkTriangularTexture, "$Revision: 1.30 $");
vtkStandardNewMacro(vtkTriangularTexture);
// Instantiate object with XSize and YSize = 64; the texture pattern =1
// (opaque at centroid); and the scale factor set to 1.0.
vtkTriangularTexture::vtkTriangularTexture()
{
this->XSize = this->YSize = 64;
this->TexturePattern = 1;
this->ScaleFactor = 1.0;
this->SetNumberOfInputPorts(0);
}
void vtkOpaqueAtElementCentroid (int XSize, int YSize, double ScaleFactor,
vtkUnsignedCharArray *newScalars)
{
int i, j;
double opacity;
double point[3];
double XScale = XSize + 1.0;
double YScale = YSize + 1.0;
unsigned char AGrayValue[2];
double dist, distToV2, distToV3;
double v1[3] = {0.0, 0.0, 0.0};
double v2[3] = {1.0, 0.0, 0.0};
double v3[3] = {0.5, sqrt(3.0)/2.0, 0.0};
point[2] = 0.0;
AGrayValue[0] = AGrayValue[1] = 255;
for (j = 0; j < YSize; j++)
{
for (i = 0; i < XSize; i++)
{
point[0] = i / XScale;
point[1] = j / YScale;
dist = vtkMath::Distance2BetweenPoints (point, v1);
distToV2 = vtkMath::Distance2BetweenPoints (point, v2);
if (distToV2 < dist)
{
dist = distToV2;
}
distToV3 = vtkMath::Distance2BetweenPoints (point, v3);
if (distToV3 < dist)
{
dist = distToV3;
}
opacity = sqrt(dist) * ScaleFactor;
if (opacity < .5)
{
opacity = 0.0;
}
if (opacity > .5)
{
opacity = 1.0;
}
AGrayValue[1] = (unsigned char) (opacity * 255);
newScalars->SetValue ((XSize*j + i)*2, AGrayValue[0]);
newScalars->SetValue ((XSize*j + i)*2 + 1, AGrayValue[1]);
}
}
}
void vtkOpaqueAtVertices (int XSize, int YSize, double ScaleFactor,
vtkUnsignedCharArray *newScalars)
{
int i, j;
double opacity;
double point[3];
double XScale = XSize + 1.0;
double YScale = YSize + 1.0;
unsigned char AGrayValue[2];
double dist, distToV2, distToV3;
double v1[3] = {0.0, 0.0, 0.0};
double v2[3] = {1.0, 0.0, 0.0};
double v3[3] = {0.5, sqrt(3.0)/2.0, 0.0};
point[2] = 0.0;
AGrayValue[0] = AGrayValue[1] = 255;
for (j = 0; j < YSize; j++)
{
for (i = 0; i < XSize; i++)
{
point[0] = i / XScale;
point[1] = j / YScale;
dist = vtkMath::Distance2BetweenPoints (point, v1);
distToV2 = vtkMath::Distance2BetweenPoints (point, v2);
if (distToV2 < dist)
{
dist = distToV2;
}
distToV3 = vtkMath::Distance2BetweenPoints (point, v3);
if (distToV3 < dist)
{
dist = distToV3;
}
opacity = sqrt(dist) * ScaleFactor;
if (opacity < .5)
{
opacity = 0.0;
}
if (opacity > .5)
{
opacity = 1.0;
}
opacity = 1.0 - opacity;
AGrayValue[1] = (unsigned char) (opacity * 255);
newScalars->SetValue ((XSize*j + i)*2, AGrayValue[0]);
newScalars->SetValue ((XSize*j + i)*2 + 1, AGrayValue[1]);
}
}
}
//----------------------------------------------------------------------------
int vtkTriangularTexture::RequestInformation (
vtkInformation * vtkNotUsed(request),
vtkInformationVector** vtkNotUsed( inputVector ),
vtkInformationVector *outputVector)
{
// get the info objects
vtkInformation* outInfo = outputVector->GetInformationObject(0);
int wExt[6] = {0,this->XSize -1, 0, this->YSize - 1, 0,0};
outInfo->Set(vtkStreamingDemandDrivenPipeline::WHOLE_EXTENT(),wExt,6);
vtkDataObject::SetPointDataActiveScalarInfo(outInfo, VTK_UNSIGNED_CHAR, 2);
return 1;
}
void vtkTriangularTexture::ExecuteData(vtkDataObject *outp)
{
vtkImageData *output = this->AllocateOutputData(outp);
vtkUnsignedCharArray *newScalars =
vtkUnsignedCharArray::SafeDownCast(output->GetPointData()->GetScalars());
if (this->XSize*this->YSize < 1)
{
vtkErrorMacro(<<"Bad texture (xsize,ysize) specification!");
return;
}
switch (this->TexturePattern)
{
case 1: // opaque at element vertices
vtkOpaqueAtVertices (this->XSize, this->YSize,
this->ScaleFactor, newScalars);
break;
case 2: // opaque at element centroid
vtkOpaqueAtElementCentroid (this->XSize, this->YSize,
this->ScaleFactor, newScalars);
break;
case 3: // opaque in rings around vertices
vtkErrorMacro(<<"Opaque vertex rings not implemented");
break;
}
}
void vtkTriangularTexture::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os,indent);
os << indent << "XSize:" << this->XSize << "\n";
os << indent << "YSize:" << this->YSize << "\n";
os << indent << "Texture Pattern:" << this->TexturePattern << "\n";
os << indent << "Scale Factor:" << this->ScaleFactor << "\n";
}
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