[vtkusers] vtkQtBarChart help

[Lodron, Gerald]

Hi

I want to make a 2D bar chart whereby the bars specify the ammount of volumina change (double value) of a region. So i want to display the name of the region on horizontal axis and and the value on vertical.

I already made it with vtkQtBarChart but i have no idea how i could display text on horizontal axis, here my code:



m_poDialog = new QDialog;

m_poChartWidget = new vtkQtChartWidget(m_poDialog);



QBoxLayout* poLayout = new QBoxLayout(QBoxLayout::Direction::TopToBottom, m_poDialog);

poLayout->addWidget(m_poChartWidget);

m_poArea = m_poChartWidget->getChartArea();

m_poBarChart = new vtkQtBarChart();

m_poArea->insertLayer( m_poArea->getAxisLayerIndex(), m_poBarChart );



vtkQtChartLegend *poLegend = new vtkQtChartLegend(m_poChartWidget);

vtkQtChartLegendManager *poManager = new vtkQtChartLegendManager(poLegend);

poManager->setChartLegend(poLegend);

poManager->setChartArea(m_poArea);

m_poChartWidget->setLegend(poLegend);



vtkQtChartMouseSelection *poSelector =vtkQtChartInteractorSetup::createDefault(m_poArea);

vtkQtChartSeriesSelectionHandler *poHandler = new vtkQtChartSeriesSelectionHandler(poSelector);

poHandler->setModeNames("Bar Chart - Series", "Bar Chart - Bars");

poHandler->setMousePressModifiers(Qt::ControlModifier, Qt::ControlModifier);

poHandler->setLayer(m_poBarChart);

poSelector->addHandler(poHandler);

poSelector->setSelectionMode("Bar Chart - Bars");

vtkQtChartInteractorSetup::setupDefaultKeys(m_poArea->getInteractor());



// Hide the x-axis grid.

vtkQtChartAxisLayer *axisLayer = m_poArea->getAxisLayer();

vtkQtChartAxis *xAxis = axisLayer->getAxis(vtkQtChartAxis::Bottom);

xAxis->getOptions()->setGridVisible(false);

xAxis->getOptions()->setLabelsVisible(true);

// Set up the poModel for the bar chart.

m_poTable = new vtkQtChartTableSeriesModel(0, m_poBarChart);

m_poBarChart->setModel(m_poTable);



QStandardItemModel *poModel = qobject_cast<QStandardItemModel *>(m_poTable->getItemModel());

if(poModel)

{

    m_poTable->setItemModel(0);

    delete poModel;

}

int iRows = poInput->GetVoluminaChanges()->size();

// Create a new item poModel for the file.

poModel = new QStandardItemModel(iRows, 1, m_poTable);

poModel->setItemPrototype(new QStandardItem());

//QStringList oLabels;

for(unsigned int nRow = 0; nRow < iRows; nRow++)

{

    poModel->setVerticalHeaderItem(nRow, new QStandardItem));

    poModel->verticalHeaderItem(nRow)->setData(QVariant((int)nRow), Qt::DisplayRole);

}

poModel->setHorizontalHeaderItem(0, new QStandardItem("Volumina change in %"));



for(unsigned int nRow = 0; nRow < iRows; nRow++)

{

    poModel->setItem(nRow, 0, new QStandardItem(""));

    poModel->item(nRow, 0)->setData(dVoluminaChange[nRow], Qt::DisplayRole);

}

// Set the new poModel in the chart.

m_poTable->setItemModel(poModel);

m_poDialog->show();



best regards
Gerald Lodron
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