Qt 5.6 | Qt QML | Writing QML Extensions with C++ | piechart.cpp Example File

Qt 5.6.3 Reference Documentation

# piechart.cpp Example File

tutorials/extending-qml/chapter3-bindings/piechart.cpp

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      #include "piechart.h"
      #include <QPainter>

      PieChart::PieChart(QQuickItem *parent)
          : QQuickPaintedItem(parent)
      {
      }

      QString PieChart::name() const
      {
          return m_name;
      }

      void PieChart::setName(const QString &name)
      {
          m_name = name;
      }

      QColor PieChart::color() const
      {
          return m_color;
      }

      void PieChart::setColor(const QColor &color)
      {
          if (color != m_color) {
              m_color = color;
              update();   // repaint with the new color
              emit colorChanged();
          }
      }

      void PieChart::paint(QPainter *painter)
      {
          QPen pen(m_color, 2);
          painter->setPen(pen);
          painter->setRenderHints(QPainter::Antialiasing, true);
          painter->drawPie(boundingRect().adjusted(1, 1, -1, -1), 90 * 16, 290 * 16);
      }

      void PieChart::clearChart()
      {
          setColor(QColor(Qt::transparent));
          update();
      }