/usr/include/osgEarthSymbology/InstanceSymbol is in libosgearth-dev 2.5.0+dfsg-8build1.
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/* osgEarth - Dynamic map generation toolkit for OpenSceneGraph
* Copyright 2008-2013 Pelican Mapping
* http://osgearth.org
*
* osgEarth is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>
*/
#ifndef OSGEARTHSYMBOLOGY_INSTANCE_SYMBOL_H
#define OSGEARTHSYMBOLOGY_INSTANCE_SYMBOL_H 1
#include <climits>
#include <osgEarth/Common>
#include <osgEarthSymbology/Symbol>
#include <osgEarthSymbology/Expression>
#include <osg/Vec3f>
namespace osgEarth { namespace Symbology
{
class InstanceResource;
class IconSymbol;
class ModelSymbol;
/**
* Base class for symbols that represent an instance of an external resource
* like an icon or a model and can be placed at a location.
*/
class OSGEARTHSYMBOLOGY_EXPORT InstanceSymbol : public Symbol
{
public:
/**
* Controls the placement of the instance.
*/
enum Placement
{
/** Places one instance at the centroid of the feature. */
PLACEMENT_CENTROID,
/** Places an instance at each feature point. */
PLACEMENT_VERTEX,
/** Places instances at regular intervals within/along the feature geometry,
according to density. */
PLACEMENT_INTERVAL,
/** Scatter instances randomly within/along feature, according to density. */
PLACEMENT_RANDOM
};
public:
/** dtor */
virtual ~InstanceSymbol() { }
/** URI of the instance to use for substitution. */
optional<StringExpression>& url() { return _url; }
const optional<StringExpression>& url() const { return _url; }
/** Name of the resource library to use with this symbol (optional) */
optional<StringExpression>& libraryName() { return _libraryName; }
const optional<StringExpression>& libraryName() const { return _libraryName; }
/** How to map feature geometry to instance placement. (default is PLACEMENT_CENTROID) */
optional<Placement>& placement() { return _placement; }
const optional<Placement>& placement() const { return _placement; }
/** For PLACEMENT_RANDOM/INTERVAL, the scattering density in instances per sqkm */
optional<float>& density() { return _density; }
const optional<float>& density() const { return _density; }
/** Model instance scale factor */
optional<NumericExpression>& scale() { return _scale; }
const optional<NumericExpression>& scale() const { return _scale; }
/** Seeding value for the randomizer */
optional<unsigned>& randomSeed() { return _randomSeed; }
const optional<unsigned>& randomSeed() const { return _randomSeed; }
/** URI alias map for embedded resources */
optional<URIAliasMap>& uriAliasMap() { return _uriAliasMap; }
const optional<URIAliasMap>& uriAliasMap() const { return _uriAliasMap; }
public: // conversions to built-in base classes, for convenience.
const IconSymbol* asIcon() const;
const ModelSymbol* asModel() const;
public:
virtual Config getConfig() const;
virtual void mergeConfig( const Config& conf );
public: // internal
/** Creates a new (empty) resource appropriate for this symbol */
virtual InstanceResource* createResource() const =0;
protected:
InstanceSymbol( const Config& conf =Config() );
protected:
optional<StringExpression> _url;
optional<StringExpression> _libraryName;
optional<NumericExpression> _scale;
optional<Placement> _placement;
optional<float> _density;
optional<unsigned> _randomSeed;
optional<URIAliasMap> _uriAliasMap;
};
} } // namespace osgEarth::Symbology
#endif // OSGEARTHSYMBOLOGY_MARKER_SYMBOL_H
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