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125 lines
3.8 KiB
125 lines
3.8 KiB
/*=========================================================================
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Program: Visualization Toolkit
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Module: $RCSfile: SGrid.cxx,v $
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Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
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All rights reserved.
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See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
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This software is distributed WITHOUT ANY WARRANTY; without even
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the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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PURPOSE. See the above copyright notice for more information.
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=========================================================================*/
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// This example shows how to manually create a structured grid.
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// The basic idea is to instantiate vtkStructuredGrid, set its dimensions,
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// and then assign points defining the grid coordinate. The number of
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// points must equal the number of points implicit in the dimensions
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// (i.e., dimX*dimY*dimZ). Also, data attributes (either point or cell)
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// can be added to the dataset.
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//
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//
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#include "vtkActor.h"
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#include "vtkCamera.h"
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#include "vtkFloatArray.h"
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#include "vtkHedgeHog.h"
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#include "vtkMath.h"
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#include "vtkPointData.h"
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#include "vtkPoints.h"
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#include "vtkPolyDataMapper.h"
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#include "vtkProperty.h"
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#include "vtkRenderWindow.h"
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#include "vtkRenderWindowInteractor.h"
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#include "vtkRenderer.h"
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#include "vtkStructuredGrid.h"
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int main()
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{
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int i, j, k, kOffset, jOffset, offset;
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float x[3], v[3], rMin=0.5, rMax=1.0, deltaRad, deltaZ;
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float radius, theta;
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static int dims[3]={13,11,11};
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// Create the structured grid.
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vtkStructuredGrid *sgrid = vtkStructuredGrid::New();
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sgrid->SetDimensions(dims);
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// We also create the points and vectors. The points
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// form a hemi-cylinder of data.
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vtkFloatArray *vectors = vtkFloatArray::New();
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vectors->SetNumberOfComponents(3);
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vectors->SetNumberOfTuples(dims[0]*dims[1]*dims[2]);
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vtkPoints *points = vtkPoints::New();
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points->Allocate(dims[0]*dims[1]*dims[2]);
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deltaZ = 2.0 / (dims[2]-1);
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deltaRad = (rMax-rMin) / (dims[1]-1);
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v[2]=0.0;
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for ( k=0; k<dims[2]; k++)
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{
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x[2] = -1.0 + k*deltaZ;
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kOffset = k * dims[0] * dims[1];
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for (j=0; j<dims[1]; j++)
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{
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radius = rMin + j*deltaRad;
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jOffset = j * dims[0];
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for (i=0; i<dims[0]; i++)
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{
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theta = i * 15.0 * vtkMath::DegreesToRadians();
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x[0] = radius * cos(theta);
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x[1] = radius * sin(theta);
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v[0] = -x[1];
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v[1] = x[0];
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offset = i + jOffset + kOffset;
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points->InsertPoint(offset,x);
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vectors->InsertTuple(offset,v);
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}
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}
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}
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sgrid->SetPoints(points);
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points->Delete();
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sgrid->GetPointData()->SetVectors(vectors);
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vectors->Delete();
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// We create a simple pipeline to display the data.
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vtkHedgeHog *hedgehog = vtkHedgeHog::New();
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hedgehog->SetInput(sgrid);
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hedgehog->SetScaleFactor(0.1);
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vtkPolyDataMapper *sgridMapper = vtkPolyDataMapper::New();
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sgridMapper->SetInputConnection(hedgehog->GetOutputPort());
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vtkActor *sgridActor = vtkActor::New();
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sgridActor->SetMapper(sgridMapper);
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sgridActor->GetProperty()->SetColor(0,0,0);
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// Create the usual rendering stuff
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vtkRenderer *renderer = vtkRenderer::New();
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vtkRenderWindow *renWin = vtkRenderWindow::New();
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renWin->AddRenderer(renderer);
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vtkRenderWindowInteractor *iren = vtkRenderWindowInteractor::New();
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iren->SetRenderWindow(renWin);
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renderer->AddActor(sgridActor);
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renderer->SetBackground(1,1,1);
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renderer->ResetCamera();
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renderer->GetActiveCamera()->Elevation(60.0);
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renderer->GetActiveCamera()->Azimuth(30.0);
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renderer->GetActiveCamera()->Zoom(1.25);
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renWin->SetSize(300,300);
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// interact with data
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renWin->Render();
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iren->Start();
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renderer->Delete();
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renWin->Delete();
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iren->Delete();
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sgrid->Delete();
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hedgehog->Delete();
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sgridMapper->Delete();
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sgridActor->Delete();
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return 0;
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}
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