void XYChartBackgroundPainter::updateLinePolygons()
{
m_linePolygons.clear();
Dimension* xAxis = m_xyChartCore->xAxis();
QList<Dimension*> dimensions = m_xyChartCore->dimensionsList();
QAbstractTableModel* model = m_xyChartCore->model();
const int xAxisColumn = xAxis->dataColumn();
foreach(Dimension* dimension, dimensions)
{
const int column = dimension->dataColumn();
QPolygonF line;
for (int row = 0; row < model->rowCount(); row++)
{
const qreal key = model->data(model->index(row, xAxisColumn)).toReal();
const qreal value = model->data(model->index(row, column)).toReal();
// Skip "NULL" values
if (qIsNaN(value))
continue;
line << m_xyChartCore->translatePoint(QPointF(key, value));
}
m_linePolygons << line;
}
emit linePolygonsUpdated();
}