C++ LineSymbol::tessellation方法代码示例

void
MGRSGraticule::setUpDefaultStyles()
{
    if (!options().gzdStyle().isSet())
    {
        LineSymbol* line = options().gzdStyle()->getOrCreate<LineSymbol>();
        line->stroke()->color() = Color::Gray;
        line->stroke()->width() = 1.0;
        line->tessellation() = 20;

        TextSymbol* text = options().gzdStyle()->getOrCreate<TextSymbol>();
        text->fill()->color() = Color(Color::White, 0.3f);
        text->halo()->color() = Color(Color::Black, 0.2f);
        text->alignment() = TextSymbol::ALIGN_CENTER_CENTER;
    }

    if (!options().sqidStyle().isSet())
    {
        LineSymbol* line = options().sqidStyle()->getOrCreate<LineSymbol>();
        line->stroke()->color() = Color(Color::White, 0.5f);
        line->stroke()->stipplePattern() = 0x1111;

        TextSymbol* text = options().sqidStyle()->getOrCreate<TextSymbol>();
        text->fill()->color() = Color(Color::White, 0.3f);
        text->halo()->color() = Color(Color::Black, 0.1f);
        text->alignment() = TextSymbol::ALIGN_CENTER_CENTER;
    }
}

      void compute()
      {
          //Tell the calculator about the new start/end points
          _profileCalculator->setStartEnd( GeoPoint(_mapNode->getMapSRS(), _start.x(), _start.y(), 0),
                                           GeoPoint(_mapNode->getMapSRS(), _end.x(), _end.y(), 0));

          if (_featureNode.valid())
          {
              _root->removeChild( _featureNode.get() );
              _featureNode = 0;
          }

          LineString* line = new LineString();
          line->push_back( _start );
          line->push_back( _end );
          Feature* feature = new Feature(line, _mapNode->getMapSRS());
          feature->geoInterp() = GEOINTERP_GREAT_CIRCLE;    

          //Define a style for the line
          Style style;
          LineSymbol* ls = style.getOrCreateSymbol<LineSymbol>();
          ls->stroke()->color() = Color::Yellow;
          ls->stroke()->width() = 2.0f;
          ls->tessellation() = 20;

          style.getOrCreate<AltitudeSymbol>()->clamping() = AltitudeSymbol::CLAMP_TO_TERRAIN;

          feature->style() = style;

          _featureNode = new FeatureNode( _mapNode, feature );
          //Disable lighting
          _featureNode->getOrCreateStateSet()->setMode(GL_LIGHTING, osg::StateAttribute::OFF);
          _root->addChild( _featureNode.get() );

      }

void
KML_LineString::parseStyle( const Config& conf, KMLContext& cs, Style& style )
{
    KML_Geometry::parseStyle(conf, cs, style);

    // need a line symbol minimally
    LineSymbol* line = style.get<LineSymbol>();
    if ( !line )
    {
        line = style.getOrCreate<LineSymbol>();
        line->stroke()->color() = osg::Vec4f(1,1,1,1);
    }

    if ( conf.value("tessellate") == "1" )
    {
        line->tessellation() = 20; // KML default
    }
}

void
KML_LinearRing::parseStyle( xml_node<>* node, KMLContext& cs, Style& style )
{
    KML_Geometry::parseStyle(node, cs, style);

    // need a line symbol minimally
    LineSymbol* line = style.get<LineSymbol>();
    if ( !line )
    {
        line = style.getOrCreate<LineSymbol>();
        line->stroke()->color() = osg::Vec4f(1,1,1,1);
    }

    if ( getValue(node, "tessellate") == "1" )
    {
        line->tessellation() = 20;
    }
}

Style buildStyle( const osg::Vec4 &color, float width )
{
    // Define a style for the feature data. Since we are going to render the
    // vectors as lines, configure the line symbolizer:
    Style style;

    LineSymbol* ls = style.getOrCreateSymbol<LineSymbol>();
    ls->stroke()->color() = color;
    ls->stroke()->width() = width;    
    ls->tessellation() = 10;

    AltitudeSymbol* as = style.getOrCreate<AltitudeSymbol>();
    as->clamping() = AltitudeSymbol::CLAMP_TO_TERRAIN;
    as->technique() = AltitudeSymbol::TECHNIQUE_SCENE;

    RenderSymbol* rs = style.getOrCreateSymbol<RenderSymbol>();
    rs->depthOffset()->enabled() = true;
    rs->depthOffset()->minBias() = 1000;

    return style;    
}

void
UTMGraticule::rebuild()
{
    if (_root.valid() == false)
        return;

    osg::ref_ptr<const Map> map;
    if (!_map.lock(map))
        return;

    // clear everything out
    _root->removeChildren( 0, _root->getNumChildren() );

    // requires a geocentric map
    if ( !map->isGeocentric() )
    {
        OE_WARN << LC << "Projected map mode is not yet supported" << std::endl;
        return;
    }

    const Profile* mapProfile = map->getProfile();

    _profile = Profile::create(
        mapProfile->getSRS(),
        mapProfile->getExtent().xMin(),
        mapProfile->getExtent().yMin(),
        mapProfile->getExtent().xMax(),
        mapProfile->getExtent().yMax(),
        8, 4 );

    _featureProfile = new FeatureProfile(_profile->getSRS());

    //todo: do this right..
    osg::StateSet* set = this->getOrCreateStateSet();
    GLUtils::setLighting(set, 0);
    set->setMode( GL_BLEND, 1 );
    set->setMode( GL_CLIP_DISTANCE0, 1 );

    // set up default options if the caller did not supply them
    if ( !options().gzdStyle().isSet() )
    {
        options().gzdStyle() = Style();

        LineSymbol* line = options().gzdStyle()->getOrCreate<LineSymbol>();
        line->stroke()->color() = Color::Gray;
        line->stroke()->width() = 1.0;
        line->tessellation() = 20;

        TextSymbol* text = options().gzdStyle()->getOrCreate<TextSymbol>();
        text->fill()->color() = Color(Color::White, 0.3f);
        text->halo()->color() = Color(Color::Black, 0.2f);
        text->alignment() = TextSymbol::ALIGN_CENTER_CENTER;
    }
    
    // initialize the UTM sector tables for this profile.
    _utmData.rebuild(_profile.get());

    // now build the lateral tiles for the GZD level.
    for( UTMData::SectorTable::iterator i = _utmData.sectorTable().begin(); i != _utmData.sectorTable().end(); ++i )
    {
        osg::Node* tile = _utmData.buildGZDTile(i->first, i->second, options().gzdStyle().get(), _featureProfile.get(), map.get());
        if ( tile )
            _root->addChild( tile );
    }
}

void
UTMGraticule::init()
{
    if ( !_mapNode.valid() )
    {
        OE_WARN << LC << "Illegal NULL map node" << std::endl;
        return;
    }

    if ( !_mapNode->isGeocentric() )
    {
        OE_WARN << LC << "Projected map mode is not yet supported" << std::endl;
        return;
    }

    // safely generate a unique ID for this graticule:
    _id = Registry::instance()->createUID();
    {
        Threading::ScopedMutexLock lock( s_graticuleMutex );
        s_graticuleRegistry[_id] = this;
    }

    const Profile* mapProfile = _mapNode->getMap()->getProfile();

    _profile = Profile::create(
        mapProfile->getSRS(),
        mapProfile->getExtent().xMin(),
        mapProfile->getExtent().yMin(),
        mapProfile->getExtent().xMax(),
        mapProfile->getExtent().yMax(),
        8, 4 );

    _featureProfile = new FeatureProfile(_profile->getSRS());

    //todo: do this right..
    osg::StateSet* set = this->getOrCreateStateSet();
    set->setMode( GL_LIGHTING, 0 );
    set->setMode( GL_BLEND, 1 );

    // set up default options if the caller did not supply them
    if ( !_options.isSet() )
    {
        _options->primaryStyle()= Style();

        LineSymbol* line = _options->primaryStyle()->getOrCreate<LineSymbol>();
        line->stroke()->color() = Color::Gray;
        line->stroke()->width() = 1.0;
        line->tessellation() = 20;

        AltitudeSymbol* alt = _options->primaryStyle()->getOrCreate<AltitudeSymbol>();
        //alt->verticalOffset() = NumericExpression(4900.0);

        TextSymbol* text = _options->primaryStyle()->getOrCreate<TextSymbol>();
        text->fill()->color() = Color(Color::White, 0.3f);
        text->halo()->color() = Color(Color::Black, 0.2f);
        text->alignment() = TextSymbol::ALIGN_CENTER_CENTER;
    }

    // make the shared depth attr:
    _depthAttribute = new osg::Depth(osg::Depth::LEQUAL,0,1,false);

    // this will intialize the graph.
    rebuild();
}

void
UTMGraticule::rebuild()
{
    // clear everything out
    this->removeChildren( 0, this->getNumChildren() );

    // requires a map node
    if ( !getMapNode() )
    {
        return;
    }

    // requires a geocentric map
    if ( !getMapNode()->isGeocentric() )
    {
        OE_WARN << LC << "Projected map mode is not yet supported" << std::endl;
        return;
    }

    const Profile* mapProfile = getMapNode()->getMap()->getProfile();

    _profile = Profile::create(
        mapProfile->getSRS(),
        mapProfile->getExtent().xMin(),
        mapProfile->getExtent().yMin(),
        mapProfile->getExtent().xMax(),
        mapProfile->getExtent().yMax(),
        8, 4 );

    _featureProfile = new FeatureProfile(_profile->getSRS());

    //todo: do this right..
    osg::StateSet* set = this->getOrCreateStateSet();
    set->setMode( GL_LIGHTING, 0 );
    set->setMode( GL_BLEND, 1 );

    // set up default options if the caller did not supply them
    if ( !_options.isSet() )
    {
        _options->primaryStyle() = Style();

        LineSymbol* line = _options->primaryStyle()->getOrCreate<LineSymbol>();
        line->stroke()->color() = Color::Gray;
        line->stroke()->width() = 1.0;
        line->tessellation() = 20;

        AltitudeSymbol* alt = _options->primaryStyle()->getOrCreate<AltitudeSymbol>();

        TextSymbol* text = _options->primaryStyle()->getOrCreate<TextSymbol>();
        text->fill()->color() = Color(Color::White, 0.3f);
        text->halo()->color() = Color(Color::Black, 0.2f);
        text->alignment() = TextSymbol::ALIGN_CENTER_CENTER;
    }


    // rebuild the graph:
    _root = new DrapeableNode( getMapNode(), false );
    this->addChild( _root );

#if 0
    // set up depth offsetting.
    osg::StateSet* s = _root->getOrCreateStateSet();
    s->setAttributeAndModes( DepthOffsetUtils::getOrCreateProgram(), 1 );
    s->addUniform( DepthOffsetUtils::getIsNotTextUniform() );
    osg::Uniform* u = DepthOffsetUtils::createMinOffsetUniform();
    u->set( 10000.0f );
    s->addUniform( u );
#endif

    // build the base Grid Zone Designator (GZD) loolup table. This is a table
    // that maps the GZD string to its extent.
    static std::string s_gzdRows( "CDEFGHJKLMNPQRSTUVWX" );
    const SpatialReference* geosrs = _profile->getSRS()->getGeographicSRS();

    // build the lateral zones:
    for( unsigned zone = 0; zone < 60; ++zone )
    {
        for( unsigned row = 0; row < s_gzdRows.size(); ++row )
        {
            double yMaxExtra = row == s_gzdRows.size()-1 ? 4.0 : 0.0; // extra 4 deg for row X

            GeoExtent cellExtent(
                geosrs,
                -180.0 + double(zone)*6.0,
                -80.0  + row*8.0,
                -180.0 + double(zone+1)*6.0,
                -80.0  + double(row+1)*8.0 + yMaxExtra );

            _gzd[ Stringify() << (zone+1) << s_gzdRows[row] ] = cellExtent;
        }        
    }

    // the polar zones (UPS):
    _gzd["1Y"] = GeoExtent( geosrs, -180.0,  84.0,   0.0,  90.0 );
    _gzd["1Z"] = GeoExtent( geosrs,    0.0,  84.0, 180.0,  90.0 );
    _gzd["1A"] = GeoExtent( geosrs, -180.0, -90.0,   0.0, -80.0 );
    _gzd["1B"] = GeoExtent( geosrs,    0.0, -90.0, 180.0, -80.0 );

    // replace the "exception" zones in Norway and Svalbard
    _gzd["31V"] = GeoExtent( geosrs, 0.0, 56.0, 3.0, 64.0 );
//.........这里部分代码省略.........