Inheritance diagram for osgEarth::LTPSpatialReference:

Collaboration diagram for osgEarth::LTPSpatialReference:

Public Member Functions
	LTPSpatialReference (void *handle, const osg::Vec3d &worldPointLLA)
virtual bool	isGeographic () const
virtual bool	isProjected () const
virtual bool	preTransform (double &x, double &y, double &z, void *context) const
virtual bool	postTransform (double &x, double &y, double &z, void *context) const
Protected Member Functions
void	_init ()
bool	_isEquivalentTo (const SpatialReference *srs) const
Private Attributes
osg::Vec3d	_worldPointLLA
osg::Matrixd	_local2world
osg::Matrixd	_world2local

Detailed Description

Local Tangent Plane SRS. Please call SpatialReference::createLTP() to construct one of these.

Definition at line 34 of file LocalTangentPlane.

Constructor & Destructor Documentation

LTPSpatialReference::LTPSpatialReference	(	void *	handle,
		const osg::Vec3d &	worldPointLLA
	)

Definition at line 32 of file LocalTangentPlane.cpp.

                                                                                      :
SpatialReference( handle, false ),
_worldPointLLA  ( worldPointLLA )
{
    //todo, set proper init string
}

Member Function Documentation

void LTPSpatialReference::_init ( ) [protected, virtual]

Reimplemented from osgEarth::SpatialReference.

Definition at line 40 of file LocalTangentPlane.cpp.

{
    SpatialReference::_init();

    _is_user_defined = true;
    _is_contiguous   = true;
    _is_ltp          = true;
    _is_geographic   = false;
    _name            = "ENU Local Tangent Plane";

    // set up the LTP matrixes.

    getEllipsoid()->computeLocalToWorldTransformFromLatLongHeight(
        osg::DegreesToRadians(_worldPointLLA.y()),
        osg::DegreesToRadians(_worldPointLLA.x()),
        _worldPointLLA.z(),
        _local2world);

    _world2local.invert( _local2world );
}

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bool LTPSpatialReference::_isEquivalentTo ( const SpatialReference * srs ) const [protected, virtual]

Reimplemented from osgEarth::SpatialReference.

Definition at line 86 of file LocalTangentPlane.cpp.

{
    return 
        srs->isLTP() && 
        _worldPointLLA == static_cast<const LTPSpatialReference*>(srs)->_worldPointLLA ;
    // todo: check the reference ellipsoids
}

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virtual bool osgEarth::LTPSpatialReference::isGeographic ( ) const [inline, virtual]

True is this is a geographic SRS (i.e. unprojected lat/long)

Reimplemented from osgEarth::SpatialReference.

Definition at line 40 of file LocalTangentPlane.

{ return false; }

virtual bool osgEarth::LTPSpatialReference::isProjected ( ) const [inline, virtual]

True if this is a projected SRS (i.e. local coordinate system)

Reimplemented from osgEarth::SpatialReference.

Definition at line 41 of file LocalTangentPlane.

{ return true; }

bool LTPSpatialReference::postTransform	(	double &	x,
		double &	y,
		double &	z,
		void *	context
	)		const `[virtual]`

Reimplemented from osgEarth::SpatialReference.

Definition at line 74 of file LocalTangentPlane.cpp.

{
    osg::Vec3d world;
    getEllipsoid()->convertLatLongHeightToXYZ(
        osg::DegreesToRadians(y), osg::DegreesToRadians(x), z,
        world.x(), world.y(), world.z() );
    osg::Vec3d local = world * _world2local;
    x = local.x(), y = local.y(), z = local.z();
    return true;
}

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bool LTPSpatialReference::preTransform	(	double &	x,
		double &	y,
		double &	z,
		void *	context
	)		const `[virtual]`

Reimplemented from osgEarth::SpatialReference.

Definition at line 62 of file LocalTangentPlane.cpp.

{
    osg::Vec3d world = osg::Vec3d(x,y,z) * _local2world;
    double lat, lon, height;
    getEllipsoid()->convertXYZToLatLongHeight(world.x(), world.y(), world.z(), lat, lon, height);
    x = osg::RadiansToDegrees(lon);
    y = osg::RadiansToDegrees(lat);
    z = height;
    return true;
}

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