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/*=========================================================================
Program: Visualization Toolkit
Module: SGrid.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.
=========================================================================*/
// This example shows how to manually create a structured grid.
// The basic idea is to instantiate vtkStructuredGrid, set its dimensions,
// and then assign points defining the grid coordinate. The number of
// points must equal the number of points implicit in the dimensions
// (i.e., dimX*dimY*dimZ). Also, data attributes (either point or cell)
// can be added to the dataset.
//
//
#include "vtkActor.h"
#include "vtkCamera.h"
#include "vtkFloatArray.h"
#include "vtkHedgeHog.h"
#include "vtkMath.h"
#include "vtkPointData.h"
#include "vtkPoints.h"
#include "vtkPolyDataMapper.h"
#include "vtkProperty.h"
#include "vtkRenderWindow.h"
#include "vtkRenderWindowInteractor.h"
#include "vtkRenderer.h"
#include "vtkStructuredGrid.h"
int main()
{
int i, j, k, kOffset, jOffset, offset;
float x[3], v[3], rMin=0.5, rMax=1.0, deltaRad, deltaZ;
float radius, theta;
static int dims[3]={13,11,11};
// Create the structured grid.
vtkStructuredGrid *sgrid = vtkStructuredGrid::New();
sgrid->SetDimensions(dims);
// We also create the points and vectors. The points
// form a hemi-cylinder of data.
vtkFloatArray *vectors = vtkFloatArray::New();
vectors->SetNumberOfComponents(3);
vectors->SetNumberOfTuples(dims[0]*dims[1]*dims[2]);
vtkPoints *points = vtkPoints::New();
points->Allocate(dims[0]*dims[1]*dims[2]);
deltaZ = 2.0 / (dims[2]-1);
deltaRad = (rMax-rMin) / (dims[1]-1);
v[2]=0.0;
for ( k=0; k<dims[2]; k++)
{
x[2] = -1.0 + k*deltaZ;
kOffset = k * dims[0] * dims[1];
for (j=0; j<dims[1]; j++)
{
radius = rMin + j*deltaRad;
jOffset = j * dims[0];
for (i=0; i<dims[0]; i++)
{
theta = i * vtkMath::RadiansFromDegrees(15.0);
x[0] = radius * cos(theta);
x[1] = radius * sin(theta);
v[0] = -x[1];
v[1] = x[0];
offset = i + jOffset + kOffset;
points->InsertPoint(offset,x);
vectors->InsertTuple(offset,v);
}
}
}
sgrid->SetPoints(points);
points->Delete();
sgrid->GetPointData()->SetVectors(vectors);
vectors->Delete();
// We create a simple pipeline to display the data.
vtkHedgeHog *hedgehog = vtkHedgeHog::New();
hedgehog->SetInputData(sgrid);
hedgehog->SetScaleFactor(0.1);
vtkPolyDataMapper *sgridMapper = vtkPolyDataMapper::New();
sgridMapper->SetInputConnection(hedgehog->GetOutputPort());
vtkActor *sgridActor = vtkActor::New();
sgridActor->SetMapper(sgridMapper);
sgridActor->GetProperty()->SetColor(0,0,0);
// Create the usual rendering stuff
vtkRenderer *renderer = vtkRenderer::New();
vtkRenderWindow *renWin = vtkRenderWindow::New();
renWin->AddRenderer(renderer);
vtkRenderWindowInteractor *iren = vtkRenderWindowInteractor::New();
iren->SetRenderWindow(renWin);
renderer->AddActor(sgridActor);
renderer->SetBackground(1,1,1);
renderer->ResetCamera();
renderer->GetActiveCamera()->Elevation(60.0);
renderer->GetActiveCamera()->Azimuth(30.0);
renderer->GetActiveCamera()->Zoom(1.25);
renWin->SetSize(300,300);
// interact with data
renWin->Render();
iren->Start();
renderer->Delete();
renWin->Delete();
iren->Delete();
sgrid->Delete();
hedgehog->Delete();
sgridMapper->Delete();
sgridActor->Delete();
return 0;
}
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