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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GFDL-1.3-no-invariants-only
/*!
\page qtcharts-stackedbarchart-example.html
\title Creating Stacked Bar Charts
\brief Shows how to create a simple stacked bar chart.
\include gallery.qdocinc
The stacked bar chart shows the data in sets as bars stacked on top of each other. The stacking
is done per category. The example shows how to create a simple stacked bar chart. Stacked bar
chart shows the data in sets as bars that are stacked on top of each other. The stacking is done
per category. Creating a stacked bar chart is just like creating a regular \l {Creating Bar Charts}
{bar chart}, except that for a stacked bar chart, we use the QStackedBarSeries API instead of
QBarSeries.
\image examples_stackedbarchart.png {Screenshot of stacked bar chart showing contributions from Jane,
John, Axel, Mary, and Samantha across six months from January to June}
The barsets are used in same way in all barcharts.
To illustrate the difference between various barcharts, we use same data in all examples.
Data, which the barchart visualizes, is defined by the QBarSet instances. Here we create the sets and append data
to them. The data is appended here with << operator. Alternatively the append method could be used.
\snippet chartsgallery/barstackedwidget.cpp 1
We create the series and append the barsets to it. The series takes ownership of the barsets. The series groups the data from sets to categories.
The first values of each set are grouped together in the first category, the second values in the second category etc.
\snippet chartsgallery/barstackedwidget.cpp 2
Here we create the chart object and add the series to it. We set the title for the chart with setTitle, and then turn on animations of the series by calling
setAnimationOptions(QChart::SeriesAnimations).
\snippet chartsgallery/barstackedwidget.cpp 3
To have the categories displayed on an axis, we need to create a
QBarCategoryAxis first. Here we create a category axis with a list of
categories and add it to the chart aligned to bottom, acting as the
x-axis. The chart takes ownership of the axis. For the y-axis we use a
value axis, aligned to the left-hand side.
\snippet chartsgallery/barstackedwidget.cpp 4
We also want to show the legend. To do so, we get the legend pointer from the chart and set it to visible. We also place the legend to the bottom of the chart by setting its alignment to Qt::AlignBottom.
\snippet chartsgallery/barstackedwidget.cpp 5
Finally, we add the chart onto a view.
\snippet chartsgallery/barstackedwidget.cpp 6
The chart is ready to be shown.
*/