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#include "qpieseries.h"
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#include "pieslice.h"
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#include <QGraphicsObject>
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#include <QDebug>
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QTCOMMERCIALCHART_BEGIN_NAMESPACE
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QPieSeries::QPieSeries(QList<qreal> x, QGraphicsObject *parent) :
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QChartSeries(parent),
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m_x(x),
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m_sizeFactor(1.0)
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{
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// Create slices
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qreal fullPie = 360;
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qreal total = 0;
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foreach (qreal value, m_x)
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total += value;
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QGraphicsItem *parentItem = qobject_cast<QGraphicsItem *>(parent);
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Q_ASSERT(parentItem);
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m_chartSize = parentItem->boundingRect();
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qreal angle = 0;
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// TODO: no need to create new slices in case size changed; we should re-use the existing ones
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foreach (qreal value, m_x) {
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qreal span = value / total * fullPie;
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PieSlice *slice = new PieSlice(randomColor(), angle, span, parentItem->boundingRect());
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slice->setParentItem(parentItem);
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m_slices.append(slice);
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angle += span;
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}
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resizeSlices(m_chartSize);
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}
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QPieSeries::~QPieSeries()
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{
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while (m_slices.count())
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delete m_slices.takeLast();
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}
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void QPieSeries::chartSizeChanged(QRectF chartRect)
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{
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// TODO: allow user setting the size?
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// TODO: allow user defining the margins?
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m_chartSize = chartRect;
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resizeSlices(m_chartSize);
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}
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void QPieSeries::resizeSlices(QRectF rect)
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{
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QRectF tempRect = rect;
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if (tempRect.width() < tempRect.height()) {
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tempRect.setWidth(tempRect.width() * m_sizeFactor);
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tempRect.setHeight(tempRect.width());
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tempRect.moveCenter(rect.center());
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} else {
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tempRect.setHeight(tempRect.height() * m_sizeFactor);
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tempRect.setWidth(tempRect.height());
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tempRect.moveCenter(rect.center());
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}
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foreach (PieSlice *slice, m_slices)
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slice->m_rect = tempRect;
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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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m_sizeFactor = factor;
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resizeSlices(m_chartSize);
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// Initiate update via the parent graphics item
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// TODO: potential issue: what if this function is called from the parent context?
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QGraphicsItem *parentItem = qobject_cast<QGraphicsItem *>(parent());
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Q_ASSERT(parentItem);
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parentItem->update();
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}
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QColor QPieSeries::randomColor()
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{
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QColor c;
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c.setRed(qrand() % 255);
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c.setGreen(qrand() % 255);
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c.setBlue(qrand() % 255);
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return c;
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}
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#include "moc_qpieseries.cpp"
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QTCOMMERCIALCHART_END_NAMESPACE
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