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/****************************************************************************
**
** Copyright (C) 2021 The Qt Company Ltd.
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/*!
\example pointsselectionandmarkers
\title Light Markers Points Selection Example
\ingroup qtcharts_examples
\brief The example shows a usage of light markers
and points selection for the series.
\image examples_pointsselectionandmarkers1.png
\image examples_pointsselectionandmarkers2.png
\include examples-run.qdocinc
\section1 Light Markers Feature
We start with creating a series, filling it with the data, and setting up selection funcionality.
It's important not to set points visibility to \c true, because light markers functionality is
an independent feature and setting both would result in undesired behavior.
\snippet pointsselectionandmarkers/main.cpp 1
Then we create the \c {QChart}, the \c {QChartview} and the control widget with its layout to arrange customization elements.
\snippet pointsselectionandmarkers/main.cpp 2
The next step is creating elements of customization.
\snippet pointsselectionandmarkers/main.cpp 3
We create the label for the marker selection combobox and add fill the combobox with the items.
Also, we provide functionality to the combobox. Considering the implementation of the light markers
functionality, we need to make sure if displaying of unselected points is checked.
Switching the visibility of the light marker off is achieved by setting it to \c "empty" \c {QImage}.
If the user unchecks the displaying of unselected points and changes the light marker image, unselected points
have to remain invisible.
If checking isn't performed, new \c {QImage} will be set for light marker
and unselected points will be visible even though it has been switched off.
\snippet pointsselectionandmarkers/main.cpp 4
Almost the same procedure applies to the selected point light marker and line color. The only difference is
that there's no need to check visibility of unselected points as it doesn't affect the functionality.
\snippet pointsselectionandmarkers/main.cpp 5
A small difference comes with changing visibility of unselected points. As it was mentioned before,
making light markers invisible is achieved by setting them to "empty" \c {QImage}.
That is why, depending on checkbox state, selected point light marker is set to "empty" \c {QImage} or
to the light marker extracted from the current index of the corresponding combobox.
\snippet pointsselectionandmarkers/main.cpp 6
The final part is to arrange the elements, add all the widgets to the main widget, and set the main window size.
\snippet pointsselectionandmarkers/main.cpp 7
*/
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