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#include "pieslice.h"
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#include "pieslicelabel.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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#include <QTime>
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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(QPieSliceId id, QPieSeries *series, QGraphicsItem* parent)
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:QGraphicsObject(parent),
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m_id(id),
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m_series(series),
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m_slicelabel(new PieSliceLabel(this)),
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m_isHovering(false)
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{
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Q_ASSERT(series);
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setAcceptHoverEvents(true);
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setAcceptedMouseButtons(Qt::LeftButton);
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updateData();
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}
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PieSlice::~PieSlice()
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{
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qDebug() << "~PieSlice()" << m_id;
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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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// set hover brush
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// TODO: what if we are using gradients...
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QBrush brush = m_data.brush();
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if (m_isHovering)
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brush.setColor(brush.color().lighter());
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painter->setRenderHint(QPainter::Antialiasing);
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painter->setPen(m_data.pen());
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painter->setBrush(brush);
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painter->drawPath(m_path);
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}
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void PieSlice::hoverEnterEvent(QGraphicsSceneHoverEvent* /*event*/)
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{
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m_isHovering = true;
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update();
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// TODO: emit hoverEnter()
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}
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void PieSlice::hoverLeaveEvent(QGraphicsSceneHoverEvent* /*event*/)
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{
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m_isHovering = false;
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update();
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// TODO: emit hoverLeave()
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}
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void PieSlice::mousePressEvent(QGraphicsSceneMouseEvent* /*event*/)
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{
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// TODO: emit clicked
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// TODO: should we let the user decide if this can be exploded?
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m_data.setExploded(!m_data.isExploded());
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m_series->update(m_data);
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}
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void PieSlice::updateGeometry(QRectF rect, qreal startAngle, qreal span)
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{
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prepareGeometryChange();
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// calculate center angle
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qreal centerAngle = startAngle + (span/2);
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// adjust rect for exploding
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rect.adjust(EXPLODE_OFFSET, EXPLODE_OFFSET, -EXPLODE_OFFSET ,-EXPLODE_OFFSET);
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if (m_data.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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// update slice path
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// TODO: draw the shape so that it might have a hole in the center
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QPainterPath path;
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path.moveTo(rect.center());
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path.arcTo(rect, -startAngle + 90, -span);
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m_path = path;
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m_rect = path.boundingRect();
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// update label position
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qreal radius = rect.height() / 2;
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QPointF edgeCenter = rect.center() + offset(centerAngle, radius + 5);
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m_slicelabel->setArmStartPoint(edgeCenter);
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m_slicelabel->setArmAngle(centerAngle);
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m_slicelabel->setArmLength(50);
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m_slicelabel->updateGeometry();
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//qDebug() << "PieSlice::updateGeometry" << m_rect;
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}
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void PieSlice::updateData()
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{
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if (!m_series->m_slices.contains(m_id))
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qWarning() << "PieSlice::updateData(): cannot find slice data!" << m_id;
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QPieSlice data = m_series->slice(m_id);
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// TODO: find out what has changed and trigger some animation
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m_data = data;
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update();
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m_slicelabel->setVisible(m_data.isLabelVisible());
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m_slicelabel->setText(m_data.label());
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//m_slicelabel->setPen(m_data.labelPen());
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//m_slicelabel->setFont(m_data.labelFont());
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m_slicelabel->updateGeometry(); // text size & font modifies the geometry
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m_slicelabel->update();
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}
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#include "moc_pieslice.cpp"
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QTCOMMERCIALCHART_END_NAMESPACE
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