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/*=========================================================================
Program: Visualization Toolkit
Module: TestImageStencilData.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.
=========================================================================*/
// The test creates two box-shaped image stencils from rectangular polydata.
// The stencils are added / subtracted, converted to an image and compared
// to a baseline
#include "vtkPolyDataToImageStencil.h"
#include "vtkLinearExtrusionFilter.h"
#include "vtkImageStencil.h"
#include "vtkImageStencilData.h"
#include "vtkImageData.h"
#include "vtkPolyData.h"
#include "vtkPoints.h"
#include "vtkIdList.h"
#include "vtkSmartPointer.h"
#include "vtkMatrixToLinearTransform.h"
#include "vtkTransformPolyDataFilter.h"
#include "vtkMatrix4x4.h"
#include "vtkTrivialProducer.h"
#include "vtkTesting.h"
//----------------------------------------------------------------------------
static vtkSmartPointer< vtkImageStencilData >
CreateBoxStencilData(double d1, double d2 )
{
// Create two stencil data from polydata's
vtkPolyData * pd = vtkPolyData::New();
pd->Allocate(1, 1);
vtkPoints * points = vtkPoints::New();
points->InsertNextPoint( d1, d1, 0.0 );
points->InsertNextPoint( d2, d1, 0.0 );
points->InsertNextPoint( d2, d2, 0.0 );
points->InsertNextPoint( d1, d2, 0.0 );
pd->SetPoints(points);
vtkIdType ptIds[4];
ptIds[0] = 0; ptIds[1] = 1; ptIds[2] = 2; ptIds[3] = 3;
pd->InsertNextCell(VTK_QUAD, 4, ptIds);
points->Delete();
// Extrude the contour along the normal to the plane the contour lies on.
vtkLinearExtrusionFilter *extrudeFilter = vtkLinearExtrusionFilter::New();
extrudeFilter->SetInputData( pd );
extrudeFilter->SetScaleFactor(1);
extrudeFilter->SetExtrusionTypeToNormalExtrusion();
extrudeFilter->SetVector( 0, 0, 1);
extrudeFilter->Update();
// Apply a transformation to the output polydata that subtracts 0.5 from
// the z co-ordinate.
const double m[16] = {1,0,0,0,0,1,0,0,0,0,1,-0.5,0,0,0,1};
vtkMatrixToLinearTransform *linearTransform = vtkMatrixToLinearTransform::New();
linearTransform->GetMatrix()->DeepCopy( m );
vtkTransformPolyDataFilter *transformPolyData = vtkTransformPolyDataFilter::New();
transformPolyData->SetInputConnection( extrudeFilter->GetOutputPort() );
transformPolyData->SetTransform( linearTransform );
transformPolyData->Update();
linearTransform->Delete();
// Rasterize the polydata (sweep it along the plane the contour lies on,
// bounded by the extrusion) and get extents into a stencil
vtkPolyDataToImageStencil *contourStencilFilter
= vtkPolyDataToImageStencil::New();
contourStencilFilter->SetInputConnection( transformPolyData->GetOutputPort() );
vtkImageData *image = vtkImageData::New();
image->SetSpacing( 1.0, 1.0, 1.0 );
image->SetOrigin( 0.0, 0.0, 0.0 );
image->SetExtent(static_cast<int>(d1)-2,static_cast<int>(d2)+2,
static_cast<int>(d1)-2,static_cast<int>(d2)+2, 0, 0 );
image->AllocateScalars(VTK_UNSIGNED_CHAR, 1);
vtkImageStencil *stencil = vtkImageStencil::New();
stencil->SetInputData( image );
stencil->SetStencilConnection( contourStencilFilter->GetOutputPort() );
stencil->SetBackgroundValue(0);
stencil->Update();
vtkSmartPointer< vtkImageStencilData >
stencilData = contourStencilFilter->GetOutput();
extrudeFilter->Delete();
transformPolyData->Delete();
contourStencilFilter->Delete();
stencil->Delete();
image->Delete();
pd->Delete();
return stencilData;
}
//----------------------------------------------------------------------------
static void GetStencilDataAsImageData(
vtkImageStencilData * stencilData, vtkImageData *image )
{
int extent[6];
stencilData->GetExtent( extent );
extent[5] = extent[4]; // Otherwise we cannot write it out as a PNG!
int extent1[6] = {0,50,0,50,0,0};
image->SetExtent(extent1);
image->AllocateScalars(VTK_UNSIGNED_CHAR, 3);
// Fill image with zeroes
for (int y=extent1[2]; y <= extent1[3]; y++)
{
unsigned char *ptr=static_cast<unsigned char *>(
image->GetScalarPointer(extent1[0], y, extent1[4] ));
for (int x=extent1[0]; x <= extent1[1]; x++)
{
*ptr = 0; ++ptr;
*ptr = 0; ++ptr;
*ptr = 0; ++ptr;
}
}
vtkIdType increments[3];
image->GetIncrements( increments );
int iter = 0;
for (int y=extent1[2]; y <= extent1[3]; y++, iter = 0)
{
int r1,r2;
int moreSubExtents = 1;
while( moreSubExtents )
{
moreSubExtents = stencilData->GetNextExtent(
r1, r2, extent1[0], extent1[1], y, extent1[4], iter);
// sanity check
if (r1 <= r2 )
{
unsigned char *beginExtent =static_cast<unsigned char *>(
image->GetScalarPointer( r1, y, extent1[4] ));
unsigned char *endExtent =static_cast<unsigned char *>(
image->GetScalarPointer( r2, y, extent1[4] ));
while (beginExtent <= endExtent)
{
*beginExtent = static_cast<unsigned char>(255);
*(beginExtent+1) = static_cast<unsigned char>(255);
*(beginExtent+2) = static_cast<unsigned char>(255);
beginExtent += increments[0];
}
}
} // end for each extent tuple
} // end for each scan line
}
//----------------------------------------------------------------------------
int TestImageStencilData( int argc, char * argv [] )
{
vtkSmartPointer< vtkImageStencilData > stencil1 =
CreateBoxStencilData(10.0, 30.0);
vtkSmartPointer< vtkImageStencilData > stencil2 =
CreateBoxStencilData(20.0, 40.0);
vtkImageData *image = vtkImageData::New();
vtkTesting *testing = vtkTesting::New();
int cc;
for ( cc = 1; cc < argc; cc ++ )
{
testing->AddArgument(argv[cc]);
}
if (atoi(argv[1]) == 1)
{
// Test Add stencils
stencil1->Add(stencil2);
GetStencilDataAsImageData(stencil1, image);
}
else if (atoi(argv[1]) == 2)
{
// Test subtraction of stencils
stencil1->Subtract(stencil2);
GetStencilDataAsImageData(stencil1, image);
}
else if (atoi(argv[1]) == 3)
{
// Test clipping of stencils
stencil1->Add(stencil2);
int clipExtents1[6] = { 15, 35, 15, 35, 0, 0 };
stencil1->Clip( clipExtents1 );
int clipExtents2[6] = { 35, 39, 35, 39, 0, 0 };
stencil2->Clip( clipExtents2 );
stencil1->Add(stencil2);
GetStencilDataAsImageData(stencil1, image);
}
else
{
return EXIT_FAILURE;
}
vtkSmartPointer< vtkTrivialProducer > producer =
vtkSmartPointer< vtkTrivialProducer >::New();
producer->SetOutput(image);
int retval = testing->RegressionTest( producer, 10 );
testing->Delete();
image->Delete();
return !retval;
}
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