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#include "pieslice.h"
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#include "piepresenter.h"
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#include <QPainter>
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#include <QDebug>
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QTCOMMERCIALCHART_BEGIN_NAMESPACE
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PieSlice::PieSlice(PiePresenter *piePresentation, int seriesIndex, qreal startAngle, qreal span)
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:QGraphicsItem(piePresentation),
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m_seriesIndex(seriesIndex),
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m_startAngle(startAngle),
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m_span(span)
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{
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Q_ASSERT(piePresentation);
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setAcceptHoverEvents(true);
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setAcceptedMouseButtons(Qt::LeftButton);
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}
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PieSlice::~PieSlice()
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{
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}
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QRectF PieSlice::boundingRect() const
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{
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return shape().boundingRect();
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}
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QPainterPath PieSlice::shape() const
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{
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QRectF rect = (static_cast<PiePresenter*>(parentItem()))->pieRect();
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qreal angle = (-m_startAngle) + (90);
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qreal span = -m_span;
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QPainterPath path;
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path.moveTo(rect.center());
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path.arcTo(rect, angle, span);
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// TODO: draw the shape so that it might have a hole in the center
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// - Sin & Cos will be needed to find inner/outer arc endpoints
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// dx, dy are offsets from the center
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//qreal l = boundingRect().height();
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//qreal dx = qSin(angle*(M_PI/180)) * l;
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//qreal dy = qCos(angle*(M_PI/180)) * l;
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// TODO: exploded slice?
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return path;
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}
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void PieSlice::paint(QPainter* painter, const QStyleOptionGraphicsItem* /*option*/, QWidget* /*widget*/)
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{
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painter->setRenderHint(QPainter::Antialiasing);
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// TODO: how to map theme settings to a pie slice? Now we
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//painter->setPen(m_theme.linePen);
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// TODO:
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QPieSlice data = (static_cast<PiePresenter*>(parentItem()))->m_pieSeries->slice(m_seriesIndex);
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painter->setBrush(data.m_color);
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//painter->setBrush(m_theme.linePen.color());
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// From Qt docs:
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// The startAngle and spanAngle must be specified in 1/16th of a degree, i.e. a full circle equals 5760 (16 * 360).
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// Positive values for the angles mean counter-clockwise while negative values mean the clockwise direction.
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// Zero degrees is at the 3 o'clock position.
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//
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// For sake of simplicity convert this so that zero degrees is at 12 o'clock and full circle is 360.
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//qreal angle = (-m_startAngle*16) + (90*16);
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//qreal span = -m_span*16;
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//painter->drawPie(boundingRect(), angle, span);
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painter->drawPath(shape());
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// Draw the label
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// TODO: do this better
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painter->drawText(boundingRect().center(), data.m_label);
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}
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void PieSlice::hoverEnterEvent(QGraphicsSceneHoverEvent * event)
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{
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QGraphicsItem::hoverEnterEvent(event);
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qDebug() << "hover" << m_seriesIndex << m_startAngle << m_span;
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}
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void PieSlice::mousePressEvent(QGraphicsSceneMouseEvent *event)
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{
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QGraphicsItem::mousePressEvent(event);
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}
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QTCOMMERCIALCHART_END_NAMESPACE
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