/home/cube/sources/osgearth/src/osgEarth/Locators.cpp File Reference

#include <osgEarth/Locators>
#include <osgEarth/TileKey>
#include <osgEarth/Registry>
#include <osgEarth/Map>
#include <osg/Notify>

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Defines
#define	MERC_MAX_LAT   85.084059050110383
#define	MERC_MIN_LAT   -85.084059050110383
Functions
static double	lonToU (double lon)
static double	latToV (double lat)
static void	getUV (const GeoExtent &ext, double lon, double lat, double &out_u, double &out_v)

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Define Documentation

#define MERC_MAX_LAT   85.084059050110383

Definition at line 159 of file Locators.cpp.

#define MERC_MIN_LAT   -85.084059050110383

Definition at line 160 of file Locators.cpp.

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Function Documentation

static void getUV	(	const GeoExtent &	ext,
		double	lon,
		double	lat,
		double &	out_u,
		double &	out_v
	)		[static]

Definition at line 174 of file Locators.cpp.

{
    out_u = (lon-ext.xMin())/ext.width();

    double vmin = latToV( osg::clampBetween( ext.yMax(), MERC_MIN_LAT, MERC_MAX_LAT ) );
    double vmax = latToV( osg::clampBetween( ext.yMin(), MERC_MIN_LAT, MERC_MAX_LAT ) );
    double vlat = latToV( osg::clampBetween( lat, MERC_MIN_LAT, MERC_MAX_LAT ) );

    out_v = (vlat-vmin)/(vmax-vmin);
}

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static double latToV

(

double

lat

)

[static]

Definition at line 168 of file Locators.cpp.

                   {
    double sin_lat = sin( osg::DegreesToRadians( lat ) );
    return 0.5 - log( (1+sin_lat) / (1-sin_lat) ) / (4*osg::PI);
}

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static double lonToU

(

double

lon

)

[static]

Definition at line 163 of file Locators.cpp.

                   {
    return (lon + 180.0) / 360.0;
}