//![0]
#include "piechart.h"
#include <QtQuick/QQuickView>
#include <QGuiApplication>
#include <QApplication>
int main(int argc, char *argv[])
{ QApplication app(argc, argv);
qmlRegisterType<PieChart>("Charts", 1, 0, "PieChart");
QQuickView view;
view.setResizeMode(QQuickView::SizeRootObjectToView);
view.setSource(QUrl::fromLocalFile("app.qml")); view.show();
return app.exec();
}
//![0]
=======================================================================================
PieChart.h
=======================================================================================
#ifndef PIECHART_H
#define PIECHART_H
#include <QtQuick/QQuickPaintedItem>
#include <QColor>
//![0]
class PieChart : public QQuickPaintedItem
{ //![0]
Q_OBJECT
Q_PROPERTY(QString name READ name WRITE setName)
Q_PROPERTY(QColor color READ color WRITE setColor)
//![1]
public:
//![1]
PieChart(QQuickItem *parent = 0);
QString name() const;
void setName(const QString &name);
QColor color() const;
void setColor(const QColor &color);
void paint(QPainter *painter);
//![2]
Q_INVOKABLE void clearChart();
signals:
void chartCleared();
//![2]
private:
QString m_name;
QColor m_color;
//![3]
};
//![3]
#endif
========================================================================================
PieChart.cpp
========================================================================================
#include "piechart.h"
#include <QPainter>
#include <QFileDialog>
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)
{ m_color = color;
}
void PieChart::paint(QPainter *painter)
{ QPen pen(m_color, 2);
painter->setPen(pen);
painter->setRenderHints(QPainter::HighQualityAntialiasing, true);
painter->drawPie(boundingRect(), 90 * 16, 290 * 16);
}
//![0]
void PieChart::clearChart()
{ QString fileName = QFileDialog::getOpenFileName(0,
tr("Open Image"), "", tr("Image Files (*.png *.jpg *.bmp)")); setColor(QColor(Qt::transparent));
update();
emit chartCleared();
}
//![0]
========================================================================================
app.qml
========================================================================================
//![0]
import Charts 1.0
import QtQuick 2.0
Item { width: 300; height: 200
PieChart { id: aPieChart
anchors.centerIn: parent
width: 100; height: 100
color: "red"
onChartCleared: console.log("The chart has been cleared") }
MouseArea { anchors.fill: parent
onClicked: aPieChart.clearChart()
}
Text { anchors { bottom: parent.bottom; horizontalCenter: parent.horizontalCenter; bottomMargin: 20 } text: "Click anywhere to clear the chart"
}
}
//![0]