LimeReport/limereport/items/charts/lrpiechart.cpp

#include "lrpiechart.h"

namespace LimeReport {

void PieChart::drawPercent(QPainter* painter, QRectF chartRect, qreal startAngle, qreal angle)
{
    painter->save();

    QPointF center(chartRect.left() + chartRect.width() / 2,
                   chartRect.top() + chartRect.height() / 2);
    qreal percent = angle / 3.6;
#if QT_VERSION < 0x050000
    qreal radAngle = (angle / 2 + startAngle) * (M_PI / 180);
#else
    qreal radAngle = qDegreesToRadians(angle / 2 + startAngle);
#endif
    qreal radius = painter->fontMetrics().boundingRect("99,9%").width();
    qreal border = chartRect.height() * 0.02;
    qreal length = (chartRect.height()) / 2 - (radius / 2 + border);
    qreal x, y;
    x = length * qCos(radAngle);
    y = length * qSin(radAngle);
    QPointF endPoint(center.x() + x, center.y() - y);
    painter->setPen(Qt::white);
    QRectF textRect(endPoint.x() - (radius / 2), endPoint.y() - (radius / 2), radius, radius);

    qreal arcLength = 3.14 * length * angle / 180;
    if (arcLength >= radius)
        painter->drawText(textRect, Qt::AlignCenter, QString::number(percent, 'f', 1) + "%");
    painter->restore();
}

void PieChart::paintChart(QPainter* painter, QRectF chartRect)
{
    painter->save();
    QPen pen(Qt::white);
    pen.setWidthF(2);
    painter->setPen(pen);

    QBrush brush(Qt::transparent);
    painter->setBrush(brush);
    painter->setBackground(QBrush(Qt::NoBrush));

    QRectF tmpRect = chartRect;
    if (chartRect.height() > chartRect.width()) {
        tmpRect.setHeight(chartRect.width());
        tmpRect.adjust(0, (chartRect.bottom() - tmpRect.bottom()) / 2, 0,
                       (chartRect.bottom() - tmpRect.bottom()) / 2);
    } else {
        tmpRect.setWidth(chartRect.height());
    }

    chartRect = tmpRect;
    painter->drawRect(chartRect);

    if (!m_chartItem->series().isEmpty()
        && !m_chartItem->series().at(0)->data()->values().isEmpty()) {
        SeriesItem* si = m_chartItem->series().at(0);
        qreal sum = 0;
        foreach (qreal value, si->data()->values()) {
            sum += value;
        }
        qreal onePercent = sum / 100;
        qreal currentDegree = 0;
        for (int i = 0; i < si->data()->values().count(); ++i) {
            qreal value = si->data()->values().at(i);
            qreal sectorDegree = (value / onePercent) * 3.6;
            painter->setBrush(si->data()->colors().at(i));
            painter->drawPie(chartRect, currentDegree * 16, sectorDegree * 16);
            drawPercent(painter, chartRect, currentDegree, sectorDegree);
            currentDegree += sectorDegree;
        }
    } else if (m_chartItem->itemMode() == DesignMode) {
        painter->setBrush(color_map[0]);
        painter->drawPie(chartRect, 0, 260 * 16);
        drawPercent(painter, chartRect, 0, 260);
        painter->setBrush(color_map[1]);
        painter->drawPie(chartRect, 260 * 16, 40 * 16);
        drawPercent(painter, chartRect, 260, 40);
        painter->setBrush(color_map[2]);
        painter->drawPie(chartRect, 300 * 16, 60 * 16);
        drawPercent(painter, chartRect, 300, 60);
    }

    pen.setWidthF(1);
    pen.setColor(Qt::gray);
    painter->setPen(pen);
    painter->setBrush(Qt::NoBrush);
    painter->drawEllipse(chartRect);
    painter->restore();
}

void PieChart::paintChartLegend(QPainter* painter, QRectF legendRect)
{
    prepareLegendToPaint(legendRect, painter);

    int indicatorSize = painter->fontMetrics().height() / 2;
    painter->setRenderHint(QPainter::Antialiasing, false);

    if (m_chartItem->drawLegendBorder())
        painter->drawRect(legendRect);

    painter->setRenderHint(QPainter::Antialiasing, true);
    QRectF indicatorsRect = legendRect.adjusted(painter->fontMetrics().height() / 2,
                                                painter->fontMetrics().height() / 2, 0, 0);

    if (!m_chartItem->series().isEmpty()
        && !m_chartItem->series().at(0)->data()->labels().isEmpty()) {
        qreal cw = 0;
        SeriesItem* si = m_chartItem->series().at(0);
        for (int i = 0; i < si->data()->labels().count(); ++i) {
            QString label = si->data()->labels().at(i);
            painter->setPen(Qt::black);
            painter->drawText(indicatorsRect.adjusted(indicatorSize + indicatorSize / 2, cw, 0, 0),
                              label);
            painter->setPen(si->data()->colors().at(i));
            painter->setBrush(si->data()->colors().at(i));
            painter->drawEllipse(indicatorsRect.adjusted(
                0, cw + indicatorSize / 2, -(indicatorsRect.width() - indicatorSize),
                -(indicatorsRect.height() - (cw + indicatorSize + indicatorSize / 2))));
            cw += painter->fontMetrics().height();
        }
    } else if (m_chartItem->itemMode() == DesignMode) {
        qreal cw = 0;
        for (int i = 0; i < m_designLabels.size(); ++i) {
            QString label = m_designLabels.at(i);
            painter->setPen(Qt::black);
            painter->drawText(indicatorsRect.adjusted(indicatorSize + indicatorSize / 2, cw, 0, 0),
                              label);
            painter->setBrush(color_map[i]);
            painter->setPen(color_map[i]);
            painter->drawEllipse(indicatorsRect.adjusted(
                0, cw + indicatorSize / 2, -(indicatorsRect.width() - indicatorSize),
                -(indicatorsRect.height() - (cw + indicatorSize + indicatorSize / 2))));
            cw += painter->fontMetrics().height();
        }
    }
}

QSizeF PieChart::calcChartLegendSize(const QFont& font, qreal)
{
    QFontMetrics fm(font);

    qreal cw = 0;
    qreal maxWidth = 0;

    if (!m_chartItem->series().isEmpty()
        && !m_chartItem->series().at(0)->data()->labels().isEmpty()) {
        SeriesItem* si = m_chartItem->series().at(0);
        foreach (QString label, si->data()->labels()) {
            cw += fm.height();
            if (maxWidth < fm.boundingRect(label).width())
                maxWidth = fm.boundingRect(label).width() + 10;
        }
    } else {
        foreach (QString label, m_designLabels) {
            cw += fm.height();
            if (maxWidth < fm.boundingRect(label).width())
                maxWidth = fm.boundingRect(label).width() + 10;
        }
    }
    cw += fm.height();
    return QSizeF(maxWidth + fm.height() * 2, cw);
}

} // namespace LimeReport