Thank you raven-worx. I found a work around where I didn't have to subclass. I basically repainted the image with offsetting the image with Qt::white to make it fit. Turns out that setPlotAreaBackgroundBrush() starts the image in the top left corner of the ChartView and not the plot area. Below is my work around:
//Build a series to add to the chart
QLineSeries *series = new QLineSeries();
*series << QPointF(11, 1) << QPointF(13, 3) << QPointF(17, 6) << QPointF(18, 3) << QPointF(20, 2);
//Create a chart object and format
QChart *chart = new QChart();
chart->legend()->hide();
chart->addSeries(series); //add the series
chart->createDefaultAxes();
chart->axisX()->setGridLineVisible(false);
chart->axisY()->setGridLineVisible(false);
//Bring in the background image
QImage skyplot("SkyPlot.jpg");
if (skyplot.isNull())
return;
//Add the chart to the view widget
ui->LchMapChartView->setChart(chart);
ui->LchMapChartView->setRenderHint(QPainter::Antialiasing);
//Note: Since we added the chart to the view we can now
//scale and translate the image appropriately. The chart
//has an appropriate size.
//Grab the size of the plot and view areas
qreal width = chart->plotArea().width();
qreal height = chart->plotArea().height();
qreal ViewW = ui->LchMapChartView->width();
qreal ViewH = ui->LchMapChartView->height();
//scale the image to fit plot area
skyplot = skyplot.scaled(QSize(width,height));
//We have to translate the image because setPlotAreaBackGround
//starts the image in the top left corner of the view not the
//plot area. So, to offset we will make a new image the size of
//view and offset our image within that image with white
QImage translated(ViewW, ViewH, Image::Format_ARGB32);
translated.fill(Qt::white);
QPainter painter(&translated);
QPointF TopLeft = chart->plotArea().topLeft();
painter.drawImage(TopLeft, skyplot);
//Display image in background
chart->setPlotAreaBackgroundBrush(translated);
chart->setPlotAreaBackgroundVisible(true);
