[vtk-developers] Bug when using ploting function (vtk 6.1, Qt5.3, Ubuntu)

[Ted Nguyen]

Update: Debug info

I am working on a Qt 5.3 project and need to plot data in 2D and 3D
coordinate systems. I've been looking into vtk 6.1 because it seems very
powerful overall and I will also need to visualize image data at a later
point. I have using Qvtkwidget smoothly with this example

#include "mainwindow.h"
#include <QApplication>
#include <vtkAutoInit.h>
VTK_MODULE_INIT(vtkRenderingOpenGL);

#include <vtkSmartPointer.h>
#include <vtkSphereSource.h>
#include <vtkPolyDataMapper.h>
#include <vtkActor.h>
#include <vtkImageViewer.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkInteractorStyleImage.h>
#include <vtkRenderer.h>
#include <vtkJPEGReader.h>

#include <QVTKWidget.h>

int main(int argc, char** argv)
{
  QApplication app(argc, argv);

  QVTKWidget widget;
  widget.resize(256,256);

  // Setup sphere
  vtkSmartPointer<vtkSphereSource> sphereSource =
      vtkSmartPointer<vtkSphereSource>::New();
  sphereSource->Update();
  vtkSmartPointer<vtkPolyDataMapper> sphereMapper =
      vtkSmartPointer<vtkPolyDataMapper>::New();
  sphereMapper->SetInputConnection(sphereSource->GetOutputPort());
  vtkSmartPointer<vtkActor> sphereActor =
      vtkSmartPointer<vtkActor>::New();
  sphereActor->SetMapper(sphereMapper);

  // Setup window
  vtkSmartPointer<vtkRenderWindow> renderWindow =
      vtkSmartPointer<vtkRenderWindow>::New();

  // Setup renderer
  vtkSmartPointer<vtkRenderer> renderer =
      vtkSmartPointer<vtkRenderer>::New();
  renderWindow->AddRenderer(renderer);

  renderer->AddActor(sphereActor);
  renderer->ResetCamera();

  widget.SetRenderWindow(renderWindow);
  widget.show();

  app.exec();

  return EXIT_SUCCESS;
}

But when I tried to implement the graph example
(/Examples/Charts/Cxx/QChartTable.cxx ), the program show Segmentation Fault
errors.

#include <vtkAutoInit.h>
VTK_MODULE_INIT(vtkRenderingOpenGL)
#include "vtkFloatArray.h"
#include "vtkMath.h"
#include "vtkRenderer.h"
#include "vtkRenderWindow.h"
#include "vtkRenderWindowInteractor.h"

#include "vtkSmartPointer.h"

#include "vtkContextView.h"
#include "vtkContextScene.h"
#include "vtkChartXY.h"
#include "vtkPlot.h"
#include "vtkTable.h"

#include "vtkTimerLog.h"

#include <QApplication>
#include <QWidget>
#include <QMainWindow>
#include <QHBoxLayout>

#include "QVTKWidget.h"
#include "vtkQtTableView.h"

#define VTK_CREATE(type, name) \
  vtkSmartPointer<type> name = vtkSmartPointer<type>::New()

int main(int argc, char** argv)
{


  // Qt initialization
  QApplication app(argc, argv);
  QMainWindow mainWindow;
  mainWindow.setGeometry(0, 0, 1150, 600);

  // QVTK set up and initialization
  QVTKWidget *qvtkWidget = new QVTKWidget(&mainWindow);

  // Set up my 2D world...
  VTK_CREATE(vtkContextView, view); // This contains a chart object
  view->SetInteractor(qvtkWidget->GetInteractor());
  qvtkWidget->SetRenderWindow(view->GetRenderWindow());

  // Create a table with some points in it...
  VTK_CREATE(vtkTable, table);
  VTK_CREATE(vtkFloatArray, arrX);
  arrX->SetName("X Axis");
  table->AddColumn(arrX);
  VTK_CREATE(vtkFloatArray, arrC);
  arrC->SetName("Cosine");
  table->AddColumn(arrC);
  VTK_CREATE(vtkFloatArray, arrS);
  arrS->SetName("Sine");
  table->AddColumn(arrS);

  // Make a timer object - need to get some frame rates/render times
  VTK_CREATE(vtkTimerLog, timer);

  // Test charting with a few more points...
  int numPoints = 29;
  float inc = 7.0 / (numPoints-1);
  table->SetNumberOfRows(numPoints);
  for (int i = 0; i < numPoints; ++i)
    {
    table->SetValue(i, 0, i * inc);
    table->SetValue(i, 1, cos(i * inc) + 0.0);
    table->SetValue(i, 2, sin(i * inc) + 0.0);
    }

//   table->Update();

  // Add multiple line plots, setting the colors etc
  vtkSmartPointer<vtkChartXY> chart = vtkSmartPointer<vtkChartXY>::New();
  view->GetScene()->AddItem(chart);
  vtkPlot *line = chart->AddPlot(vtkChart::LINE);
  line->SetInputData(table, 0, 1);
  line->SetColor(255, 0, 0, 255);
  line = chart->AddPlot(vtkChart::LINE);
  line->SetInputData(table, 0, 2);
  line->SetColor(0, 255, 0, 255);
  line->SetWidth(2.0);

  // Instantiate a vtkQtChart and use that too
/*  vtkQtChart *qtChart = new vtkQtChart;
  chart = qtChart->chart();
  line = chart->AddPlot(vtkChart::LINE);
  line->SetTable(table, 0, 1);
  line->SetColor(255, 0, 0, 255);
  line = chart->AddPlot(vtkChart::LINE);
  line->SetTable(table, 0, 2);
  line->SetColor(0, 255, 0, 255);
  line->SetWidth(2.0);
*/
  // Now lets try to add a table view
  QWidget *widget = new QWidget(&mainWindow);
  QHBoxLayout *layout = new QHBoxLayout(widget);
  VTK_CREATE(vtkQtTableView, tableView);
  tableView->SetSplitMultiComponentColumns(true);
  tableView->AddRepresentationFromInput(table);
  tableView->Update();
  layout->addWidget(qvtkWidget, 2);
  //layout->addWidget(qtChart, 2);
  layout->addWidget(tableView->GetWidget());
  mainWindow.setCentralWidget(widget);

  // Now show the application and start the event loop
  mainWindow.show();

  return app.exec();
}

I have recompiled VTK in debug mode and get more debug info. This is the
backtrace for this program. In this screenshot show that problem could come
form "this" pointer "this" should be vtkTextRenderer * but "this" point to
null pointer. I think this could be a bug in VTK 6.1 but have no idea how to
fix it.Please give me some suggestion. Thanks 

<http://vtk.1045678.n5.nabble.com/file/n5730118/17.png> 



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