I am making a QScatterSeries. I have some points plotted in 3 different series (red, green, blue). It all plots perfectly when I use chart->createDefaultAxes()
. All points are where they should be. The issue is that when I change the X Axis and Y Axis in my chart, all my points become incorrectly plotted. None of them are where they should be. This is strange because I have hard-coded my points.
I have tried adding my series to the chart before and after adding the X and Y Axis to my chart, thinking that may have caused my points to become confused. But that did not fix it.
Chart when I use the default axes:
char *myargv[2];
int myargc = 1;
myargv[0] = strdup("");
// First, create QApplication
QApplication a(myargc, myargv);
// Create our red, green, blue acceleration series
redSeries = new QScatterSeries;
redSeries->setMarkerSize(15.0);
redSeries->append(1, 20);
redSeries->append(2, 30);
redSeries->append(3, 44);
redSeries->setColor(Qt::red);
greenSeries = new QScatterSeries;
greenSeries->setMarkerSize(15.0);
greenSeries->append(1, 10);
greenSeries->append(2, -9);
greenSeries->append(3, 20);
greenSeries->setColor(Qt::green);
blueSeries = new QScatterSeries;
blueSeries->setMarkerSize(15.0);
blueSeries->append(1, -20);
blueSeries->append(2, -10);
blueSeries->append(3, 0);
blueSeries->setColor(Qt::blue);
// Customize our chart
QChart *chart = new QChart();
chart->createDefaultAxes();
chart->setTitle("Example Plot");
QValueAxis *axisX = new QValueAxis;
axisX->setRange(0, 130);
axisX->setTickCount(10);
QValueAxis *axisY = new QValueAxis;
axisY->setRange(-50, 50);
axisY->setTickCount(10);
// Add series to chart
chart->addSeries(redSeries);
chart->addSeries(greenSeries);
chart->addSeries(blueSeries);
// Create chartView
QChartView *chartView = new QChartView(chart);
chartView->setRenderHint(QPainter::Antialiasing);
//chartView->chart()->setAxisX(axisX);
//chartView->chart()->setAxisY(axisY);
// Render everything within our Window
QMainWindow w;
w.setCentralWidget(chartView);
w.resize(400, 300);
w.show();
return a.exec();
}
When I try to use my own X and Y axis, I simply comment out the chart->createDefaultAxes()
and comment back in the:
//chartView->chart()->setAxisX(axisX);
//chartView->chart()->setAxisY(axisY);
This causes me to get the incorrectly plotted chart:
My question is, what am I doing wrong? Also, in other parts of my code, I plan to dynamically receive data and use that data to plot points on my graph, such as this:
while (receivingData) {
redSeries->append(x, y); // Will not work because my hard-coded points (above) do not work
greenSeries->append(x, y);
blueSeries->append(x, y);
}
What do I have to do to ensure that all my points are plotted correctly with my custom X and Y Axis? I am assuming that I will most likely have to do some math within my append
to match my QChart's new dimensions but how do I achieve that?
I found the answer to my question in another post.
Posting here in case it helps someone QtCharts add custom axis