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#include "qpieseries.h"
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#include "qpieslice.h"
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#include <QDebug>
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QTCOMMERCIALCHART_BEGIN_NAMESPACE
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/*!
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\class QPieSeries::ChangeSet
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\brief Defines the changes in the series.
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Contains the changes that have occurred in the series. Lists of added, changed and removed slices.
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\sa QPieSeries::changed()
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*/
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/*!
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\internal
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*/
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void QPieSeries::ChangeSet::appendAdded(QPieSlice* slice)
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{
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if (!m_added.contains(slice))
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m_added << slice;
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}
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/*!
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\internal
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*/
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void QPieSeries::ChangeSet::appendAdded(QList<QPieSlice*> slices)
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{
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foreach (QPieSlice* s, slices)
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appendAdded(s);
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}
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/*!
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\internal
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*/
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void QPieSeries::ChangeSet::appendChanged(QPieSlice* slice)
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{
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if (!m_changed.contains(slice))
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m_changed << slice;
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}
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/*!
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\internal
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*/
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void QPieSeries::ChangeSet::appendRemoved(QPieSlice* slice)
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{
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if (!m_removed.contains(slice))
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m_removed << slice;
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}
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/*!
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Returns a list of slices that have been added to the series.
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\sa QPieSeries::changed()
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*/
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QList<QPieSlice*> QPieSeries::ChangeSet::added() const
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{
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return m_added;
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}
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/*!
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Returns a list of slices that have been changed in the series.
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\sa QPieSeries::changed()
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*/
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QList<QPieSlice*> QPieSeries::ChangeSet::changed() const
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{
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return m_changed;
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}
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/*!
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Returns a list of slices that have been removed from the series.
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\sa QPieSeries::changed()
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*/
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QList<QPieSlice*> QPieSeries::ChangeSet::removed() const
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{
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return m_removed;
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}
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/*!
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Returns true if there are no added/changed or removed slices in the change set.
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*/
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bool QPieSeries::ChangeSet::isEmpty() const
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{
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if (m_added.count() || m_changed.count() || m_removed.count())
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return false;
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return true;
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}
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/*!
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\enum QPieSeries::PiePosition
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This enum describes pie position within its bounding rectangle
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\value PiePositionMaximized
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\value PiePositionTopLeft
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\value PiePositionTopRight
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\value PiePositionBottomLeft
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\value PiePositionBottomRight
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*/
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/*!
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\class QPieSeries
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\brief Pie series API for QtCommercial Charts
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The pie series defines a pie chart which consists of pie slices which are QPieSlice objects.
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The slices can have any values as the QPieSeries will calculate its relative value to the sum of all slices.
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The actual slice size is determined by that relative value.
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By default the pie is defined as a full pie but it can be a partial pie.
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This can be done by setting a starting angle and angle span to the series.
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To help with the most common user interaction scenarions there some convenience functions.
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Like exploding a slice when clicked and higlighting when user hovers over a slice.
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*/
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/*!
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Constructs a series object which is a child of \a parent.
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*/
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QPieSeries::QPieSeries(QObject *parent) :
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QSeries(parent),
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m_sizeFactor(1.0),
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m_position(PiePositionMaximized),
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m_pieStartAngle(0),
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m_pieAngleSpan(360)
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{
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}
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/*!
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Destroys the object. Note that adding series to QChart transfers the ownership to the chart.
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*/
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QPieSeries::~QPieSeries()
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{
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}
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/*!
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Returns QChartSeries::SeriesTypePie.
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*/
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QSeries::QSeriesType QPieSeries::type() const
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{
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return QSeries::SeriesTypePie;
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}
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/*!
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Sets an array of \a slices to the series replacing the existing slices.
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Slice ownership is passed to the series.
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*/
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void QPieSeries::replace(QList<QPieSlice*> slices)
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{
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clear();
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add(slices);
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}
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/*!
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Adds an array of \a slices to the series.
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Slice ownership is passed to the series.
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*/
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void QPieSeries::add(QList<QPieSlice*> slices)
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{
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ChangeSet changeSet;
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foreach (QPieSlice* s, slices) {
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s->setParent(this);
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m_slices << s;
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changeSet.appendAdded(s);
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}
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updateDerivativeData();
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foreach (QPieSlice* s, slices) {
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connect(s, SIGNAL(changed()), this, SLOT(sliceChanged()));
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connect(s, SIGNAL(clicked()), this, SLOT(sliceClicked()));
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connect(s, SIGNAL(hoverEnter()), this, SLOT(sliceHoverEnter()));
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connect(s, SIGNAL(hoverLeave()), this, SLOT(sliceHoverLeave()));
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}
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emit changed(changeSet);
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}
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/*!
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Adds a single \a slice to the series.
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Slice ownership is passed to the series.
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*/
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void QPieSeries::add(QPieSlice* slice)
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{
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add(QList<QPieSlice*>() << slice);
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}
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/*!
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Adds a single \a slice to the series and returns a reference to the series.
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Slice ownership is passed to the series.
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*/
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QPieSeries& QPieSeries::operator << (QPieSlice* slice)
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{
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add(slice);
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return *this;
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}
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/*!
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Adds a single slice to the series with give \a value and \a name.
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Slice ownership is passed to the series.
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*/
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QPieSlice* QPieSeries::add(qreal value, QString name)
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{
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QPieSlice* slice = new QPieSlice(value, name);
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add(slice);
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return slice;
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}
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/*!
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Removes a single \a slice from the series and deletes the slice.
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Do not reference this pointer after this call.
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*/
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void QPieSeries::remove(QPieSlice* slice)
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{
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if (!m_slices.removeOne(slice)) {
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Q_ASSERT(0); // TODO: how should this be reported?
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return;
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}
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ChangeSet changeSet;
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changeSet.appendRemoved(slice);
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emit changed(changeSet);
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delete slice;
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slice = NULL;
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updateDerivativeData();
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}
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/*!
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Clears all slices from the series.
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*/
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void QPieSeries::clear()
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{
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if (m_slices.count() == 0)
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return;
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ChangeSet changeSet;
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foreach (QPieSlice* s, m_slices) {
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changeSet.appendRemoved(s);
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m_slices.removeOne(s);
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delete s;
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}
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emit changed(changeSet);
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updateDerivativeData();
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}
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/*!
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Counts the number of the slices in this series.
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*/
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int QPieSeries::count() const
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{
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return m_slices.count();
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}
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/*!
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Returns a list of slices that belong to this series.
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*/
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QList<QPieSlice*> QPieSeries::slices() const
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{
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return m_slices;
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}
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/*!
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Sets the size \a factor of the pie. 1.0 is the default value.
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Note that the pie will not grow beyond its absolute maximum size.
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In practice its use is to make the pie appear smaller.
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\sa sizeFactor()
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*/
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void QPieSeries::setSizeFactor(qreal factor)
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{
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if (factor < 0.0)
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return;
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if (m_sizeFactor != factor) {
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m_sizeFactor = factor;
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emit sizeFactorChanged();
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}
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}
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/*!
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Gets the size factor of the pie.
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\sa setSizeFactor()
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*/
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qreal QPieSeries::sizeFactor() const
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{
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return m_sizeFactor;
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}
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/*!
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Sets the \a position of the pie within its bounding rectangle.
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\sa PiePosition, position()
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*/
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void QPieSeries::setPosition(PiePosition position)
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{
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if (m_position != position) {
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m_position = position;
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emit positionChanged();
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}
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}
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/*!
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Gets the position of the pie within its bounding rectangle.
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\sa PiePosition, setPosition()
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*/
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QPieSeries::PiePosition QPieSeries::position() const
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{
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return m_position;
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}
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/*!
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Sets the \a startAngle and \a angleSpan of this series.
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Full pie is 360 degrees where 0 degrees is at 12 a'clock.
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*/
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void QPieSeries::setSpan(qreal startAngle, qreal angleSpan)
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{
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if (startAngle >= 0 && startAngle < 360 &&
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angleSpan > 0 && angleSpan <= 360) {
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m_pieStartAngle = startAngle;
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m_pieAngleSpan = angleSpan;
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updateDerivativeData();
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}
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}
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/*!
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Sets the all the slice labels \a visible or invisible.
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\sa QPieSlice::isLabelVisible(), QPieSlice::setLabelVisible()
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*/
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void QPieSeries::setLabelsVisible(bool visible)
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{
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foreach (QPieSlice* s, m_slices)
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s->setLabelVisible(visible);
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}
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/*!
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Convenience method for exploding a slice when user clicks the pie. Set \a enable to true to
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explode slices by clicking.
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\sa QPieSlice::isExploded(), QPieSlice::setExploded(), QPieSlice::setExplodeDistance()
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*/
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void QPieSeries::setClickExplodes(bool enable)
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{
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if (enable)
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connect(this, SIGNAL(clicked(QPieSlice*)), this, SLOT(toggleExploded(QPieSlice*)));
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else
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disconnect(this, SLOT(toggleExploded(QPieSlice*)));
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}
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/*!
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Convenience method for highlighting a slice when user hovers over the slice.
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It changes the slice color to be lighter and shows the label of the slice.
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Set \a enable to true to highlight a slice when user hovers on top of it.
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*/
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void QPieSeries::setHoverHighlighting(bool enable)
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{
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if (enable) {
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connect(this, SIGNAL(hoverEnter(QPieSlice*)), this, SLOT(highlightOn(QPieSlice*)));
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connect(this, SIGNAL(hoverLeave(QPieSlice*)), this, SLOT(highlightOff(QPieSlice*)));
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} else {
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disconnect(this, SLOT(hoverEnter(QPieSlice*)));
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disconnect(this, SLOT(hoverLeave(QPieSlice*)));
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}
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}
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/*!
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Returns the sum of all slice values in this series.
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\sa QPieSlice::value(), QPieSlice::setValue()
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*/
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qreal QPieSeries::total() const
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{
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return m_total;
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}
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/*!
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\fn void QPieSeries::changed(const QPieSeries::ChangeSet& changeSet)
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This signal emitted when something has changed in the series.
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The \a changeSet contains the details of which slices have been added, changed or removed.
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\sa QPieSeries::ChangeSet, QPieSlice::changed()
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*/
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/*!
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\fn void QPieSeries::clicked(QPieSlice* slice)
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This signal is emitted when a \a slice has been clicked.
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\sa QPieSlice::clicked()
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*/
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/*!
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\fn void QPieSeries::hoverEnter(QPieSlice* slice)
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This signal is emitted when user has hovered over a \a slice.
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\sa QPieSlice::hoverEnter()
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*/
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/*!
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\fn void QPieSeries::hoverLeave(QPieSlice* slice)
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This signal is emitted when user has hovered away from a \a slice.
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\sa QPieSlice::hoverLeave()
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*/
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/*!
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\fn void QPieSeries::sizeFactorChanged()
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This signal is emitted when size factor has been changed.
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\sa sizeFactor(), setSizeFactor()
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*/
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/*!
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\fn void QPieSeries::positionChanged()
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This signal is emitted when position of the pie has been changed.
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\sa position(), setPosition()
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*/
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void QPieSeries::sliceChanged()
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{
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QPieSlice* slice = qobject_cast<QPieSlice *>(sender());
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Q_ASSERT(m_slices.contains(slice));
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ChangeSet changeSet;
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changeSet.appendChanged(slice);
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emit changed(changeSet);
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updateDerivativeData();
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}
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void QPieSeries::sliceClicked()
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{
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QPieSlice* slice = qobject_cast<QPieSlice *>(sender());
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Q_ASSERT(m_slices.contains(slice));
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emit clicked(slice);
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}
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void QPieSeries::sliceHoverEnter()
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{
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QPieSlice* slice = qobject_cast<QPieSlice *>(sender());
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Q_ASSERT(m_slices.contains(slice));
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emit hoverEnter(slice);
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}
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void QPieSeries::sliceHoverLeave()
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{
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QPieSlice* slice = qobject_cast<QPieSlice *>(sender());
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Q_ASSERT(m_slices.contains(slice));
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emit hoverLeave(slice);
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}
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void QPieSeries::toggleExploded(QPieSlice* slice)
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{
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Q_ASSERT(slice);
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slice->setExploded(!slice->isExploded());
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}
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void QPieSeries::highlightOn(QPieSlice* slice)
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{
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Q_ASSERT(slice);
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QColor c = slice->brush().color().lighter();
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slice->setBrush(c);
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}
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void QPieSeries::highlightOff(QPieSlice* slice)
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{
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Q_ASSERT(slice);
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QColor c = slice->brush().color().darker(150);
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slice->setBrush(c);
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}
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void QPieSeries::updateDerivativeData()
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{
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m_total = 0;
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// nothing to do?
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if (m_slices.count() == 0)
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return;
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// calculate total
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foreach (QPieSlice* s, m_slices)
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m_total += s->value();
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// we must have some values
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if (m_total == 0) {
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qDebug() << "QPieSeries::updateDerivativeData() total == 0";
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Q_ASSERT(m_total > 0); // TODO: is this the correct way to handle this?
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}
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// update slice attributes
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qreal sliceAngle = m_pieStartAngle;
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foreach (QPieSlice* s, m_slices) {
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bool changed = false;
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qreal percentage = s->value() / m_total;
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if (s->m_percentage != percentage) {
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s->m_percentage = percentage;
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changed = true;
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}
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qreal sliceSpan = m_pieAngleSpan * percentage;
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if (s->m_angleSpan != sliceSpan) {
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s->m_angleSpan = sliceSpan;
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changed = true;
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}
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if (s->m_startAngle != sliceAngle) {
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s->m_startAngle = sliceAngle;
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changed = true;
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}
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sliceAngle += sliceSpan;
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if (changed)
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emit s->changed();
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}
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}
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#include "moc_qpieseries.cpp"
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QTCOMMERCIALCHART_END_NAMESPACE
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