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#include "qchart.h"
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#include "qchartaxis.h"
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#include "chartpresenter_p.h"
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#include "chartdataset_p.h"
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#include <QGraphicsScene>
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#include <QGraphicsSceneResizeEvent>
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#include <QDebug>
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QTCOMMERCIALCHART_BEGIN_NAMESPACE
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/*!
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\enum QChart::ChartTheme
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This enum describes the theme used by the chart.
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\value ChartThemeDefault
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\value ChartThemeVanilla
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\value ChartThemeIcy
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\value ChartThemeGrayscale
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\value ChartThemeScientific
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*/
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/*!
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\class QChart
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\brief QtCommercial chart API.
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QChart is a QGraphicsWidget that you can show in a QGraphicsScene. It manages the graphical
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representation of different types of QChartSeries and other chart related objects like
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QChartAxis and QChartLegend. If you simply want to show a chart in a layout, you can use the
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convenience class QChartView instead of QChart.
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\sa QChartView
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*/
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/*!
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Constructs a chart object which is a child of a\a parent. Parameter \a wFlags is passed to the QGraphicsWidget constructor.
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*/
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QChart::QChart(QGraphicsItem *parent, Qt::WindowFlags wFlags) : QGraphicsWidget(parent,wFlags),
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m_backgroundItem(0),
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m_titleItem(0),
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m_dataset(new ChartDataSet(this)),
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m_presenter(new ChartPresenter(this,m_dataset))
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{
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}
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/*!
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Destroys the object and it's children, like QChartSeries and QChartAxis object added to it.
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*/
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QChart::~QChart()
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{
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}
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/*!
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Adds the \a series and optional \a axisY onto the chart and takes the ownership of the objects.
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If auto scaling is enabled, re-scales the axes the series is bound to (both the x axis and
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the y axis).
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*/
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void QChart::addSeries(QChartSeries* series, QChartAxis* axisY)
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{
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m_dataset->addSeries(series, axisY);
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}
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/*!
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Removes the \a series specified in a perameter from the QChartView.
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It releses its ownership of the specified QChartSeries object.
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It does not delete the pointed QChartSeries data object
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\sa addSeries(), removeAllSeries()
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*/
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void QChart::removeSeries(QChartSeries* series)
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{
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m_dataset->removeSeries(series);
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}
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/*!
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Removes all the QChartSeries that have been added to the QChartView
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It also deletes the pointed QChartSeries data objects
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\sa addSeries(), removeSeries()
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*/
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void QChart::removeAllSeries()
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{
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m_dataset->removeAllSeries();
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}
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/*!
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Sets the \a brush that is used for painting the background of the chart area.
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*/
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void QChart::setChartBackgroundBrush(const QBrush& brush)
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{
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createChartBackgroundItem();
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m_backgroundItem->setBrush(brush);
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m_backgroundItem->update();
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}
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/*!
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Sets the \a pen that is used for painting the background of the chart area.
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*/
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void QChart::setChartBackgroundPen(const QPen& pen)
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{
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createChartBackgroundItem();
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m_backgroundItem->setPen(pen);
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m_backgroundItem->update();
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}
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/*!
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Sets the chart \a title. The description text that is rendered above the chart.
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*/
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void QChart::setChartTitle(const QString& title)
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{
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createChartTitleItem();
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m_titleItem->setPlainText(title);
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}
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/*!
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Sets the \a font that is used for rendering the description text that is rendered above the chart.
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*/
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void QChart::setChartTitleFont(const QFont& font)
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{
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createChartTitleItem();
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m_titleItem->setFont(font);
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}
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void QChart::createChartBackgroundItem()
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{
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if(!m_backgroundItem) {
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m_backgroundItem = new QGraphicsRectItem(this);
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m_backgroundItem->setPen(Qt::NoPen);
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m_backgroundItem->setZValue(ChartPresenter::BackgroundZValue);
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}
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}
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void QChart::createChartTitleItem()
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{
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if(!m_titleItem) {
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m_titleItem = new QGraphicsTextItem(this);
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m_titleItem->setZValue(ChartPresenter::BackgroundZValue);
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}
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}
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/*!
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Returns the chart margin, which is the distance between the widget edge and the part of the chart where the actual data can be displayed.
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\sa setMargin()
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*/
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int QChart::margin() const
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{
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return m_presenter->margin();
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}
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/*!
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Sets the chart \a margin, which is the distance between the widget edge and the part of the chart where the actual data can be displayed.
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\sa margin()
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*/
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void QChart::setMargin(int margin)
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{
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m_presenter->setMargin(margin);
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}
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/*!
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Sets the \a theme used by the chart for rendering the graphical representation of the data
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\sa ChartTheme, chartTheme()
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*/
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void QChart::setChartTheme(QChart::ChartTheme theme)
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{
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m_presenter->setChartTheme(theme);
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}
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/*!
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Returns the theme enum used by the chart.
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\sa ChartTheme, setChartTheme()
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*/
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QChart::ChartTheme QChart::chartTheme() const
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{
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return m_presenter->chartTheme();
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}
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/*!
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Zooms in the view by a factor of 2
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*/
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void QChart::zoomIn()
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{
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if (!m_dataset->nextDomain()) {
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QRectF rect = m_presenter->geometry();
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rect.setWidth(rect.width()/2);
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rect.setHeight(rect.height()/2);
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rect.moveCenter(m_presenter->geometry().center());
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zoomIn(rect);
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}
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}
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/*!
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Zooms in the view to a maximum level at which \a rect is still fully visible.
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*/
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void QChart::zoomIn(const QRectF& rect)
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{
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if(!rect.isValid()) return;
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QRectF r = rect.normalized();
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int margin = m_presenter->margin();
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r.translate(-margin, -margin);
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m_dataset->addDomain(r,m_presenter->geometry());
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}
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/*!
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Restores the view zoom level to the previous one.
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*/
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void QChart::zoomOut()
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{
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m_dataset->previousDomain();
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}
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/*!
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Resets to the default view.
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*/
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void QChart::zoomReset()
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{
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m_dataset->clearDomains();
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}
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/*!
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Returns the pointer to the x axis object of the chart
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*/
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QChartAxis* QChart::axisX() const
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{
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return m_dataset->axisX();
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}
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/*!
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Returns the pointer to the y axis object of the chart
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*/
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QChartAxis* QChart::axisY() const
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{
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return m_dataset->axisY();
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}
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/*!
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Resizes and updates the chart area using the \a event data
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*/
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void QChart::resizeEvent(QGraphicsSceneResizeEvent *event)
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{
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m_rect = QRectF(QPoint(0,0),event->newSize());
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QRectF rect = m_rect.adjusted(margin(),margin(), -margin(), -margin());
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// recalculate title position
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if (m_titleItem) {
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QPointF center = m_rect.center() -m_titleItem->boundingRect().center();
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m_titleItem->setPos(center.x(),m_rect.top()/2 + margin()/2);
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}
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//recalculate background gradient
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if (m_backgroundItem) {
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m_backgroundItem->setRect(rect);
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}
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QGraphicsWidget::resizeEvent(event);
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update();
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}
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#include "moc_qchart.cpp"
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QTCOMMERCIALCHART_END_NAMESPACE
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