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

#include <osgEarth/SpatialReference>
#include <osgEarth/Registry>
#include <osgEarth/Cube>
#include <osgEarth/LocalTangentPlane>
#include <OpenThreads/ScopedLock>
#include <osg/Notify>
#include <ogr_api.h>
#include <ogr_spatialref.h>
#include <algorithm>

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Namespaces
namespace	anonymous_namespace{SpatialReference.cpp}
Defines
#define	LC   "[SpatialReference] "
#define	USE_CUSTOM_MERCATOR_TRANSFORM   1
Functions
std::string	anonymous_namespace{SpatialReference.cpp}::getOGRAttrValue (void *_handle, const std::string &name, int child_num, bool lowercase=false)
std::string &	anonymous_namespace{SpatialReference.cpp}::replaceIn (std::string &s, const std::string &sub, const std::string &other)
static osg::Matrixd	getTransformFromExtents (double minX, double minY, double maxX, double maxY)
static bool	mercatorToGeographic (double *x, double *y, double *z, int numPoints)
static bool	geographicToMercator (double *x, double *y, double *z, int numPoints)

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Define Documentation

#define LC   "[SpatialReference] "

Definition at line 30 of file SpatialReference.cpp.

#define USE_CUSTOM_MERCATOR_TRANSFORM   1

Definition at line 34 of file SpatialReference.cpp.

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Function Documentation

static bool geographicToMercator	(	double *	x,
		double *	y,
		double *	z,
		int	numPoints
	)		[static]

Definition at line 741 of file SpatialReference.cpp.

{
    for( int i=0; i<numPoints; i++ )
    {
        double xr = (osg::DegreesToRadians(x[i]) - (-osg::PI)) / (2.0*osg::PI);
        double sinLat = sin(osg::DegreesToRadians(y[i]));
        double oneMinusSinLat = 1-sinLat;
        if ( oneMinusSinLat != 0.0 )
        {
            double yr = ((0.5 * log( (1+sinLat)/oneMinusSinLat )) - (-osg::PI)) / (2.0*osg::PI);
            x[i] = MERC_MINX + (xr * MERC_WIDTH);
            y[i] = MERC_MINY + (yr * MERC_HEIGHT);
            // z doesn't change
        }
    }
    return true;
}

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static osg::Matrixd getTransformFromExtents	(	double	minX,
		double	minY,
		double	maxX,
		double	maxY
	)		[static]

Definition at line 660 of file SpatialReference.cpp.

{
    osg::Matrixd transform;
    transform.set(
        maxX-minX, 0.0,       0.0, 0.0,
        0.0,       maxY-minY, 0.0, 0.0,
        0.0,       0.0,       1.0, 0.0,
        minX,      minY,      0.0, 1.0); 
    return transform;
}

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static bool mercatorToGeographic	(	double *	x,
		double *	y,
		double *	z,
		int	numPoints
	)		[static]

Definition at line 726 of file SpatialReference.cpp.

{
    for( int i=0; i<numPoints; i++ )
    {
        double xr = -osg::PI + ((x[i]-MERC_MINX)/MERC_WIDTH)*2.0*osg::PI;
        double yr = -osg::PI + ((y[i]-MERC_MINY)/MERC_HEIGHT)*2.0*osg::PI;
        x[i] = osg::RadiansToDegrees( xr );
        y[i] = osg::RadiansToDegrees( 2.0 * atan( exp(yr) ) - osg::PI_2 );
        // z doesn't change
    }
    return true;
}

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