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#include "pieslicelabel_p.h"
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#include <QPainter>
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#include <qmath.h>
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#include <QGraphicsTextItem>
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#include <QDebug>
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QTCOMMERCIALCHART_BEGIN_NAMESPACE
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#define PI 3.14159265
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PieSliceLabel::PieSliceLabel(QGraphicsItem* parent)
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:QGraphicsItem(parent),
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m_armAngle(0),
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m_armLength(0)
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{
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}
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void PieSliceLabel::paint(QPainter *painter, const QStyleOptionGraphicsItem* /*option*/, QWidget* /*widget*/)
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{
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painter->setPen(m_pen);
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painter->drawPath(m_armPath);
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// TODO: do we need a pen for text?
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painter->setFont(m_font);
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painter->drawText(m_textRect.bottomLeft(), m_text);
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//qDebug() << "PieSliceLabel::paint" << m_text << m_textRect;
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}
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void PieSliceLabel::updateGeometry()
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{
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prepareGeometryChange();
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// calculate text size
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QFontMetricsF fm(m_font);
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QRectF textRect = fm.boundingRect(m_text);
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// calculate path for arm and text start point
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qreal dx = qSin(m_armAngle*(PI/180)) * m_armLength;
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qreal dy = -qCos(m_armAngle*(PI/180)) * m_armLength;
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QPointF parm1 = m_armStartPoint + QPointF(dx, dy);
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// calculate horizontal arm and text position
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QPointF parm2 = parm1;
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textRect.moveBottomLeft(parm1);
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if (m_armAngle < 180) { // arm swings the other way on the left side
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parm2 += QPointF(textRect.width(), 0);
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} else {
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parm2 += QPointF(-textRect.width(),0);
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textRect.moveBottomLeft(parm2);
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}
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// add a little offset to text so that it does not touch the arm
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qreal yOffset = m_pen.widthF() ? m_pen.widthF() : 2;
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textRect.translate(0, -yOffset);
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// update arm path
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QPainterPath path;
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path.moveTo(m_armStartPoint);
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path.lineTo(parm1);
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path.lineTo(parm2);
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// update paths & rects
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m_armPath = path;
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m_textRect = textRect;
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m_rect = path.boundingRect().united(m_textRect);
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//qDebug() << "PieSliceLabel::updateGeometry" << m_text << m_armStartPoint << m_armLength << m_armAngle << m_textRect;
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}
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QTCOMMERCIALCHART_END_NAMESPACE
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