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/****************************************************************************
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**
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** Copyright (C) 2014 Digia Plc
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** All rights reserved.
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** For any questions to Digia, please use contact form at http://qt.io
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**
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** This file is part of the Qt Charts module.
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**
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** Licensees holding valid commercial license for Qt may use this file in
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** accordance with the Qt License Agreement provided with the Software
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** or, alternatively, in accordance with the terms contained in a written
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** agreement between you and Digia.
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**
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** If you have questions regarding the use of this file, please use
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** contact form at http://qt.io
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**
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****************************************************************************/
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#include <QtCharts/QPolarChart>
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#include <QtCharts/QAbstractAxis>
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QT_CHARTS_BEGIN_NAMESPACE
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/*!
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\enum QPolarChart::PolarOrientation
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This type is used to specify the polar orientation of an axis.
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\value PolarOrientationRadial
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\value PolarOrientationAngular
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*/
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/*!
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\class QPolarChart
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\inmodule Qt Charts
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\brief Polar chart API for Qt Charts.
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QPolarChart is a specialization of QChart to show a polar chart.
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Polar charts support line, spline, area, and scatter series, and all axis types
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supported by those series.
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\note When setting ticks to an angular QValueAxis, keep in mind that the first and last tick
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are co-located at 0/360 degree angle.
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\note If the angular distance between two consecutive points in a series is more than 180 degrees,
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any line connecting the two points becomes meaningless, so choose the axis ranges accordingly
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when displaying line, spline, or area series. In such case series don't draw a direct line between
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the two points, but instead draw a line to and from the center of the chart.
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\note Polar charts draw all axes of same orientation in the same position, so using multiple
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axes of same orientation can be confusing, unless the extra axes are only used to customize the
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grid (e.g. you can display a highlighted range with a secondary shaded QCategoryAxis or provide
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unlabeled subticks with a secondary QValueAxis that has its labels hidden).
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\sa QChart
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*/
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/*!
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Constructs a polar chart as a child of the \a parent.
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Parameter \a wFlags is passed to the QChart constructor.
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*/
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QPolarChart::QPolarChart(QGraphicsItem *parent, Qt::WindowFlags wFlags)
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: QChart(QChart::ChartTypePolar, parent, wFlags)
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{
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}
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/*!
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Destroys the polar chart object and its children, like series and axis objects added to it.
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*/
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QPolarChart::~QPolarChart()
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{
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}
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/*!
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Returns the axes added for the \a series with \a polarOrientation. If no series is provided, then any axis with the
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specified polar orientation is returned.
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\sa addAxis()
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*/
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QList<QAbstractAxis *> QPolarChart::axes(PolarOrientations polarOrientation, QAbstractSeries *series) const
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{
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Qt::Orientations orientation(0);
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if (polarOrientation.testFlag(PolarOrientationAngular))
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orientation |= Qt::Horizontal;
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if (polarOrientation.testFlag(PolarOrientationRadial))
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orientation |= Qt::Vertical;
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return QChart::axes(orientation, series);
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}
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/*!
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This convenience method adds \a axis to the polar chart with \a polarOrientation.
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The chart takes the ownership of the axis.
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\note Axes can be added to a polar chart also with QChart::addAxis() instead of this method.
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The specified alignment determines the polar orientation: horizontal alignments indicate angular
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axis and vertical alignments indicate radial axis.
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\sa QChart::removeAxis(), QChart::createDefaultAxes(), QAbstractSeries::attachAxis(), QChart::addAxis()
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*/
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void QPolarChart::addAxis(QAbstractAxis *axis, PolarOrientation polarOrientation)
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{
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if (!axis || axis->type() == QAbstractAxis::AxisTypeBarCategory) {
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qWarning("QAbstractAxis::AxisTypeBarCategory is not a supported axis type for polar charts.");
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} else {
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Qt::Alignment alignment = Qt::AlignLeft;
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if (polarOrientation == PolarOrientationAngular)
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alignment = Qt::AlignBottom;
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QChart::addAxis(axis, alignment);
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}
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}
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/*!
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Angular axes of a polar chart report horizontal orientation and radial axes report
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vertical orientation.
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This function is a convenience function for converting the orientation of an \a axis to
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corresponding polar orientation. If the \a axis is NULL or not added to a polar chart,
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the return value is meaningless.
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*/
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QPolarChart::PolarOrientation QPolarChart::axisPolarOrientation(QAbstractAxis *axis)
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{
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if (axis && axis->orientation() == Qt::Horizontal)
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return PolarOrientationAngular;
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else
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return PolarOrientationRadial;
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}
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#include "moc_qpolarchart.cpp"
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QT_CHARTS_END_NAMESPACE
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