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#include <math.h>
#pragma hdrstop

#include "DownloaderF.h"

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#pragma package(smart_init)


static double Lon2TileX(double ALon, int AZoom)
{
    return (ALon + 180.0) / 360.0 * pow(2.0, AZoom);
}
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static double Lat2TileY(double ALat, int AZoom)
{
    return (1.0 - log(tan(ALat * M_PI/180.0) + 1.0 / cos(ALat * M_PI/180.0)) / M_PI) / 2.0 * pow(2.0, AZoom);
}
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static double TileX2Lon(double AX, int AZoom)
{
    return AX / pow(2.0, AZoom) * 360.0 - 180;
}
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static double TileY2Lat(double AY, int AZoom)
{
    double n = M_PI - 2.0 * M_PI * AY / pow(2.0, AZoom);
    return 180.0 / M_PI * atan(0.5 * (exp(n) - exp(-n)));
}
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String g_sTileUrl = "http://xdworld.vworld.kr:8080/2d/Base/service/%d/%d/%d.png";
String getTileURL(double ALon, double ALat, int AZoom)
{
    String sUrl;
    sUrl.printf(g_sTileUrl.c_str(), AZoom, (int)Lon2TileX(ALon, AZoom), (int)Lat2TileY(ALat, AZoom));
    return sUrl;
}
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String getTileURL(int AX, int AY, int AZoom)
{
    String sUrl;
    sUrl.printf(g_sTileUrl.c_str(), AZoom, AX, AY);
    return sUrl;
}
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