How to display rectangle on a graph at a specific location.

preddy

I need to create a graph that displays rectangles that can be changed depending upon the user input values. And the rectangle should contain text.

I used QAreaSeries to display a rectangle but there's no function to type text over it. I need to add a rectangle to the same graph every time that function is called.

The first image is how I want to display.

The second image is how my code displays the rectangle.

QChart *qChart = new QChart();
QChartView *myChartView = new QChartView(qChart);
QValueAxis *qAxisX = new QValueAxis;
QValueAxis qAxisY = new QValueAxis;
qAxisX->setRange(0, 30);
qAxisY->setRange(0, ending_height_of_rect2);

QLineSeries *series0 = new QLineSeries();
QLineSeries *series1 = new QLineSeries();

*series0 << QPointF(1, starting_point_of_rectangle) << QPointF(1, ending_height_of_rect);
*series1 << QPointF(4, starting_point_of_rectangle) << QPointF(4, ending_height_of_rect);

QAreaSeries *series = new QAreaSeries(series0, series1);
myChartView->chart()->addSeries(series);
qChart->setAxisX(qAxisX, series);
qChart->setAxisY(qAxisY, series);

ui->verticalLayout->addWidget(myChartView);

Annotation 2.png

Please let me know if I can use any other method instead of QAreaSeries which helps me get this work done a lot more easily.

Any type of help is appreciated.

Thank you.

mrjj

Hi
I think you can reuse this example
https://doc.qt.io/qt-5/qtcharts-callout-example.html