/*!
    \example examples/polarchart
    \title Polar chart example
    \subtitle

    The example shows how to create simple polar chart with multiple different series.
    It also shows how to implement scrolling and zooming of the polar chart as well as
    visually demonstrate how polar chart and cartesian chart relate to each other.

    \image examples_polarchart.png

    Creating polar chart is done via QPolarChart instance instead of QChart.

    \snippet ../examples/polarchart/main.cpp 1

    Axes are created similarly to cartesian charts, but when axes are added to the chart,
    you can use polar orientations instead of alignments.

    \snippet ../examples/polarchart/main.cpp 2

    Zooming and scrolling of the polar chart is logically nearly identical to zooming and scrolling of cartesian chart.
    The main difference is that when scrolling along X-axis (angular axis), angle is used instead of number of pixels.
    Another difference is that zooming to a rectangle cannot be done.

    \snippet ../examples/polarchart/chartview.cpp 1

    Same axes and series can be used in both cartesian and polar charts, though not simultaneously.
    To switch between chart types, you need to first remove series and axes from the old chart and then add
    them to the new chart. If you want to preserve axis ranges, those need to be copied, too.

    \snippet ../examples/polarchart/chartview.cpp 2

*/