QtOsmTileMaps/mapdatadisk.cpp at master · KurlesHS/QtOsmTileMaps · GitHub

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#include "mapdatadisk.h"
#include <QDir>
#include <QDebug>
#include <QRegExp>
#include <QTime>

#include "json.h"
#include "geocoord.h"

MapDataDisk::MapDataDisk(const QString &pathToTiles, QObject *parent) :
    IMapData(parent),
    m_pathToTiles(pathToTiles)
{
    QDir path(pathToTiles);

    if (path.exists()){
        parseDir(pathToTiles);
    } else {
        QFile file(pathToTiles);
        if (file.exists()) {
            file.open(QIODevice::ReadOnly);
            QString jsonData = QString::fromUtf8(file.readAll());
            file.close();
            bool ok;
            QtJson::JsonObject result = QtJson::parse(jsonData, ok).toMap();
            if (ok) {
                int minZoom = result.value("minzoom", -1).toInt();
                int maxZoom = result.value("maxzoom", -1).toInt();
                qreal topX;
                qreal topY;
                qreal bottomX;
                qreal bottomY;
                ok = result.contains("bounds");
                if (ok) {
                    QtJson::JsonArray bounds = result.value("bounds").toList();
                    if (bounds.size() == 4) {
                        while (true) {
                            topX = bounds.value(0).toDouble(&ok);
                            if (!ok) break;
                            topY = bounds.value(1).toDouble(&ok);
                            if (!ok) break;
                            bottomX = bounds.value(2).toDouble(&ok);
                            if (!ok) break;
                            bottomY = bounds.value(3).toDouble(&ok);
                            break;
                        }
                    } else {
                        ok = false;
                    }
                }
                if (ok && minZoom >= 0 && maxZoom >= 0) {
                    for (int i = minZoom; i <= maxZoom; ++i) {
                        GeoCoord coordTop = GeoCoord(topY, topX);
                        GeoCoord coordBottom = GeoCoord(bottomY, bottomX);
                        ZoomData zd;
                        zd.zoomLvl = i;
                        QPoint delataTile;
                        zd.minX = coordTop.getTilePosition(i, delataTile).x();
                        zd.minY = coordTop.getTilePosition(i, delataTile).y();
                        zd.maxX = coordBottom.getTilePosition(i, delataTile).x();
                        zd.maxY = coordBottom.getTilePosition(i, delataTile).y();
                        addZoomLevel(zd);
                    }
                }
            }
        }
    }
}

QPixmap MapDataDisk::getTile(int x, int y)
{
    if (x < minX() || x > maxX() || y < minY() || y > maxY() ) {
        return defaultBackground();
    }
    QPixmap tile = getImageFromCache(x, y);
    if (tile.isNull()) {
        QString filename = QString("%1/%2/%3.png")
                .arg(zoomLvl())
                .arg(x)
                .arg(y);
        QString filepath = pathAppend(m_pathToTiles, filename);
        tile.load(filepath);
    } else {
        return tile;
    }
    if (tile.isNull() || tile.height() != 0x100 || tile.width() != 0x100) {
        return defaultBackground();
    }
    putImageInCache(x, y, tile);
    return tile;
}

QString MapDataDisk::pathAppend(const QString& path1, const QString& path2)
{
    return QDir::cleanPath(path1 + QDir::separator() + path2);
}

void MapDataDisk::parseDir(const QString &pathToTiles)
{
    QDir path(pathToTiles);
    QRegExp regExpForYCoord("^(\\d+)\\.png$");
    for (const QString zoomLvlStr : path.entryList(QDir::Dirs)) {
        bool ok;
        int zoomLvl = zoomLvlStr.toInt(&ok);
        if (ok) {
            QDir pathToXCoord(pathAppend(pathToTiles, zoomLvlStr));
            ZoomData zd;
            zd.zoomLvl = zoomLvl;
            zd.maxX = INT_MIN;
            zd.minX = INT_MAX;
            zd.maxY = INT_MIN;
            zd.minY = INT_MAX;
            bool firstEntry = true;
            for (const QString &xStr : pathToXCoord.entryList(QDir::Dirs)) {
                int x = xStr.toInt(&ok);
                if (ok) {
                    if (x < zd.minX) {
                        zd.minX = x;
                    }
                    if (x > zd.maxX) {
                        zd.maxX = x;
                    }
                }
                if (firstEntry && ok) {
                    firstEntry = false;
                    QDir pathToYCoord(pathAppend(pathToXCoord.absolutePath(), xStr));
                    for (const QString &yStr : pathToYCoord.entryList({QString("*.png")}, QDir::Files)) {
                        if (regExpForYCoord.indexIn(yStr) >= 0) {
                            int y = regExpForYCoord.cap(1).toInt(&ok);
                            if (ok) {
                                if (y < zd.minY) {
                                    zd.minY = y;
                                }
                                if (y > zd.maxY) {
                                    zd.maxY = y;
                                }
                            }
                        }
                    }
                }
            }
            if (zd.maxX != INT_MIN && zd.maxY != INT_MIN && zd.minX != INT_MAX && zd.minY != INT_MAX) {
                if (!isValidData()) {
                    setDataValid(true);
                }
                addZoomLevel(zd);
            }
        }
    }
}