qt5base-lts/examples/embedded/lightmaps/slippymap.h

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#ifndef SLIPPYMAP_H
#define SLIPPYMAP_H

#include <QNetworkAccessManager>
#include <QPixmap>
#include <QUrl>

class QNetworkReply;
class QPainter;

class SlippyMap: public QObject
{
    Q_OBJECT

public:
    SlippyMap(QObject *parent = 0);
    void invalidate();
    void render(QPainter *p, const QRect &rect);
    void pan(const QPoint &delta);

    int width;
    int height;
    int zoom;
    qreal latitude;
    qreal longitude;

signals:
    void updated(const QRect &rect);

private slots:
    void handleNetworkData(QNetworkReply *reply);
    void download();

protected:
    QRect tileRect(const QPoint &tp);

private:
    QPoint m_offset;
    QRect m_tilesRect;
    QPixmap m_emptyTile;
    QHash<QPoint, QPixmap> m_tilePixmaps;
    QNetworkAccessManager m_manager;
    QUrl m_url;
};

#endif