StitchVideo/stitch/src/GoogleTile.h

#pragma once

#include <opencv2/opencv.hpp>
#include <cmath>
#include <sstream>

class GoogleTile
{
public:
    // 构造函数
    GoogleTile(int zoom, int x, int y, cv::Mat content = cv::Mat())
    {
        _zoom = zoom;
        _x = x;
        _y = y;
        _content = content.clone();
        _isValid = !content.empty();
    }

    // 获取缩放级别
    int getZoom() const
    {
        return _zoom;
    }

    // 获取X坐标
    int getX() const
    {
        return _x;
    }

    // 获取Y坐标
    int getY() const
    {
        return _y;
    }

    // 获取瓦片内容
    cv::Mat getContent() const
    {
        return _content;
    }

    // 设置瓦片内容
    void setContent(cv::Mat content)
    {
        _content = content.clone();
        _isValid = !content.empty();
    }

    // 检查瓦片是否有效
    bool isValid() const
    {
        return _isValid;
    }

    // 获取相邻瓦片坐标
    GoogleTile getLeftTile() const
    {
        int newX = (_x - 1 + (1 << _zoom)) % (1 << _zoom);
        return GoogleTile(_zoom, newX, _y);
    }

    GoogleTile getRightTile() const
    {
        int newX = (_x + 1) % (1 << _zoom);
        return GoogleTile(_zoom, newX, _y);
    }

    GoogleTile getTopTile() const
    {
        int newY = (_y - 1 + (1 << _zoom)) % (1 << _zoom);
        return GoogleTile(_zoom, _x, newY);
    }

    GoogleTile getBottomTile() const
    {
        int newY = (_y + 1) % (1 << _zoom);
        return GoogleTile(_zoom, _x, newY);
    }

    // 将瓦片坐标转换为经纬度
    void tileToLatLon(double& lat, double& lon) const
    {
        double n = M_PI - 2.0 * M_PI * _y / (1 << _zoom);
        lat = 180.0 / M_PI * atan(0.5 * (exp(n) - exp(-n)));
        lon = _x / (double)(1 << _zoom) * 360.0 - 180.0;
    }

    // 将经纬度转换为瓦片坐标
    static void latLonToTile(double lat, double lon, int zoom, int& x, int& y)
    {
        double lat_rad = lat * M_PI / 180.0;
        double n = 1 << zoom;
        x = static_cast<int>((lon + 180.0) / 360.0 * n);
        y = static_cast<int>((1.0 - log(tan(lat_rad) + 1.0 / cos(lat_rad)) / M_PI) / 2.0 * n);
    }

    // 获取瓦片URL（根据谷歌地图规范）
    std::string getUrl() const
    {
        std::stringstream ss;
        ss << "https://mt.google.com/vt/lyrs=s&x=" << _x << "&y=" << _y << "&z=" << _zoom;
        return ss.str();
    }

private:
    int _zoom;      // 缩放级别 (0-21)
    int _x;         // 瓦片X坐标
    int _y;         // 瓦片Y坐标
    cv::Mat _content; // 瓦片图像数据
    bool _isValid;  // 瓦片是否有效
};