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#include "pieslice.h"
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#include "piepresenter.h"
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#include "qpieseries.h"
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#include <QPainter>
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#include <QDebug>
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#include <qmath.h>
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#include <QGraphicsSceneEvent>
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QTCOMMERCIALCHART_BEGIN_NAMESPACE
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#define PI 3.14159265
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#define EXPLODE_OFFSET 20
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QPointF offset(qreal angle, qreal length)
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{
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qreal dx = qSin(angle*(PI/180)) * length;
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qreal dy = qCos(angle*(PI/180)) * length;
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return QPointF(dx, -dy);
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}
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PieSlice::PieSlice(PiePresenter *presenter, int seriesIndex, qreal startAngle, qreal span)
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:QGraphicsItem(presenter),
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m_label(new QGraphicsTextItem(this)),
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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(presenter);
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setAcceptHoverEvents(true);
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setAcceptedMouseButtons(Qt::LeftButton);
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updateGeometry();
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// TODO: use themes
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m_pen = QPen(Qt::black);
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m_brush = QBrush(sliceData().m_color);
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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 m_rect;
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}
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QPainterPath PieSlice::shape() const
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{
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return m_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: themes
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painter->setPen(m_pen);
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painter->setBrush(m_brush);
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painter->drawPath(m_path);
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// Draw the label
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// TODO: do this better
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//QTextItem text;
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painter->drawText(m_center, sliceData().m_label);
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}
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void PieSlice::hoverEnterEvent(QGraphicsSceneHoverEvent* event)
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{
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m_brush = QBrush(sliceData().m_color.lighter());
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update();
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}
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void PieSlice::hoverLeaveEvent(QGraphicsSceneHoverEvent* /*event*/)
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{
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m_brush = QBrush(sliceData().m_color);
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update();
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}
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void PieSlice::mousePressEvent(QGraphicsSceneMouseEvent* /*event*/)
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{
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QPieSlice data = sliceData();
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data.m_isExploded = !data.m_isExploded;
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(static_cast<PiePresenter*>(parentItem()))->m_pieSeries->update(m_seriesIndex, data);
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}
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void PieSlice::updateGeometry()
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{
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prepareGeometryChange();
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PiePresenter *presenter = static_cast<PiePresenter*>(parentItem());
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QRectF rect = presenter->pieRect();
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rect.adjust(EXPLODE_OFFSET, EXPLODE_OFFSET, -EXPLODE_OFFSET ,-EXPLODE_OFFSET);
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qreal centerAngle = m_startAngle + (m_span/2);
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if (presenter->m_pieSeries->slice(m_seriesIndex).m_isExploded) {
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QPointF d = offset((centerAngle), EXPLODE_OFFSET);
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rect.translate(d.x(), d.y());
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}
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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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m_path = path;
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m_rect = path.boundingRect();
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qreal radius = rect.height() / 2;
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m_center = rect.center() + offset(centerAngle, radius / 2);
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}
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QPieSlice PieSlice::sliceData()
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{
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return (static_cast<PiePresenter*>(parentItem()))->m_pieSeries->slice(m_seriesIndex);
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}
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QTCOMMERCIALCHART_END_NAMESPACE
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