Inheritance diagram for osgEarth::Features::FeatureDisplayLayout:

Collaboration diagram for osgEarth::Features::FeatureDisplayLayout:

Public Member Functions
	FeatureDisplayLayout (const Config &conf=Config())
optional< float > &	tileSizeFactor ()
const optional< float > &	tileSizeFactor () const
optional< bool > &	cropFeatures ()
const optional< bool > &	cropFeatures () const
void	addLevel (const FeatureLevel &level)
unsigned	getNumLevels () const
const FeatureLevel *	getLevel (unsigned i) const
float	getMaxRange () const
unsigned	chooseLOD (const FeatureLevel &level, double fullExtentRadius) const
Config	getConfig () const
Protected Types
typedef std::multimap< float, FeatureLevel >	Levels
Protected Member Functions
void	fromConfig (const Config &conf)
Protected Attributes
optional< float >	_tileSizeFactor
optional< bool >	_cropFeatures
Levels	_levels

Detailed Description

Defines a multi-LOD layout for a feature model layer.

Definition at line 66 of file FeatureDisplayLayout.

Member Typedef Documentation

typedef std::multimap<float,FeatureLevel> osgEarth::Features::FeatureDisplayLayout::Levels [protected]

Definition at line 113 of file FeatureDisplayLayout.

Constructor & Destructor Documentation

FeatureDisplayLayout::FeatureDisplayLayout ( const Config & conf = Config() )

Definition at line 84 of file FeatureDisplayLayout.cpp.

                                                               :
_tileSizeFactor( 15.0f ),
_cropFeatures( false )
{
    fromConfig( conf );
}

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Member Function Documentation

void FeatureDisplayLayout::addLevel ( const FeatureLevel & level )

Adds a new feature level

Definition at line 113 of file FeatureDisplayLayout.cpp.

{
    _levels.insert( std::make_pair( -level.maxRange(), level ) );
}

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unsigned FeatureDisplayLayout::chooseLOD	(	const FeatureLevel &	level,
		double	fullExtentRadius
	)		const

Calculates the "best" quadtree LOD for the specified level, given the radius of the full extent of the dataset.

Definition at line 143 of file FeatureDisplayLayout.cpp.

{
    double radius = fullExtentRadius;    
    unsigned lod = 1;
    for( ; lod < 20; ++lod )
    {
        radius *= 0.5;
        float lodMaxRange = radius * _tileSizeFactor.value();
        
        if ( level.maxRange() >= lodMaxRange )
            break;
    }
    return lod-1;
}

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optional<bool>& osgEarth::Features::FeatureDisplayLayout::cropFeatures ( ) [inline]

Whether to crop geometry to fit within the cell extents when chopping a feature level up into grid cells. By default, this is false, meaning that a feature whose centroid falls within the cell will be included. Setting this to true means that if any part of the feature falls within the working cell, it will be cropped to the cell extents and used.

Definition at line 86 of file FeatureDisplayLayout.

{ return _cropFeatures; }

const optional<bool>& osgEarth::Features::FeatureDisplayLayout::cropFeatures ( ) const [inline]

Definition at line 87 of file FeatureDisplayLayout.

{ return _cropFeatures; }

void FeatureDisplayLayout::fromConfig ( const Config & conf ) [protected]

Definition at line 92 of file FeatureDisplayLayout.cpp.

{
    conf.getIfSet( "tile_size_factor", _tileSizeFactor );
    conf.getIfSet( "crop_features",    _cropFeatures );
    ConfigSet children = conf.children( "level" );
    for( ConfigSet::const_iterator i = children.begin(); i != children.end(); ++i )
        addLevel( FeatureLevel( *i ) );
}

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Config FeatureDisplayLayout::getConfig ( ) const

Definition at line 102 of file FeatureDisplayLayout.cpp.

{
    Config conf( "layout" );
    conf.addIfSet( "tile_size_factor", _tileSizeFactor );
    conf.addIfSet( "crop_features",    _cropFeatures );
    for( Levels::const_iterator i = _levels.begin(); i != _levels.end(); ++i )
        conf.add( i->second.getConfig() );
    return conf;
}

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const FeatureLevel * FeatureDisplayLayout::getLevel ( unsigned i ) const

Gets the nth level

Definition at line 125 of file FeatureDisplayLayout.cpp.

{
    unsigned i = 0;
    for( Levels::const_iterator k = _levels.begin(); k != _levels.end(); ++k )
    {
        if ( n == i++ )
            return &(k->second);
    }
    return 0L;
}

float FeatureDisplayLayout::getMaxRange ( ) const

Gets the maximum range of the schema

Definition at line 137 of file FeatureDisplayLayout.cpp.

{
    return _levels.size() > 0 ? _levels.begin()->second.maxRange() : 0.0f;
}

unsigned FeatureDisplayLayout::getNumLevels ( ) const

Gets the number of feature levels in the schema

Definition at line 119 of file FeatureDisplayLayout.cpp.

{
    return _levels.size();
}

optional<float>& osgEarth::Features::FeatureDisplayLayout::tileSizeFactor ( ) [inline]

The ratio of visibility range to feature tile radius. Default is 15. Increase this to produce more, smaller tiles at a given visibility range; decrease this to procide fewer, larger tiles.

Definition at line 76 of file FeatureDisplayLayout.