C++ TextSymbol::provider方法代码示例

//.........这里部分代码省略.........
            if (!text) text = sc.getOrCreateSymbol<TextSymbol>();
            if (p->second == "screen") text->sizeMode() = TextSymbol::SIZEMODE_SCREEN;
            else if (p->second == "object") text->sizeMode() = TextSymbol::SIZEMODE_OBJECT;
        }
        else if (p->first == CSS_TEXT_REMOVE_DUPLICATE_LABELS)
        {
            if (!text) text = sc.getOrCreateSymbol<TextSymbol>();
            if (p->second == "true") text->removeDuplicateLabels() = true;
            else if (p->second == "false") text->removeDuplicateLabels() = false;
        } 
        else if (p->first == CSS_TEXT_LINE_ORIENTATION)
        {
            if (!text) text = sc.getOrCreateSymbol<TextSymbol>();
            if (p->second == "parallel") text->lineOrientation() = TextSymbol::LINEORIENTATION_PARALLEL;
            else if (p->second == "horizontal") text->lineOrientation() = TextSymbol::LINEORIENTATION_HORIZONTAL;
            else if (p->second == "perpendicular") text->lineOrientation() = TextSymbol::LINEORIENTATION_PERPENDICULAR;
        }
        else if (p->first == CSS_TEXT_LINE_PLACEMENT)
        {
            if (!text) text = sc.getOrCreateSymbol<TextSymbol>();
            if (p->second == "centroid") text->linePlacement() = TextSymbol::LINEPLACEMENT_CENTROID;
            else if (p->second == "along-line") text->linePlacement() = TextSymbol::LINEPLACEMENT_ALONG_LINE;
        }
        else if (p->first == "text-content")
        {
            if (!text) text = sc.getOrCreate<TextSymbol>();
            text->content() = StringExpression( p->second );
        }
        else if (p->first == "text-priority")
        {
            if (!text) text = sc.getOrCreateSymbol<TextSymbol>();
            text->priority() = NumericExpression( p->second );
        }
        else if (p->first == "text-provider")
        {
            if (!text) text = sc.getOrCreate<TextSymbol>();
            text->provider() = p->second;
        }

        //else if (p->first == CSS_TEXT_CONTENT)
        //{
        //    if (!text) text = sc.getOrCreateSymbol<TextSymbol>();
        //    text->content() = p->second;
        //}
        //else if (p->first == CSS_TEXT_CONTENT_ATTRIBUTE_DELIMITER)
        //{
        //    if (!text) text = sc.getOrCreateSymbol<TextSymbol>();
        //    text->contentAttributeDelimiter() = p->second;
        //}

        else if (p->first == "marker")
        {
            if (!marker) marker = sc.getOrCreateSymbol<MarkerSymbol>();
            marker->url() = p->second;
        }
        else if (p->first == "marker-placement")
        {
            if (!marker) marker = sc.getOrCreateSymbol<MarkerSymbol>();
            if      (p->second == "centroid") marker->placement() = MarkerSymbol::PLACEMENT_CENTROID;
            else if (p->second == "interval") marker->placement() = MarkerSymbol::PLACEMENT_INTERVAL;
            else if (p->second == "random"  ) marker->placement() = MarkerSymbol::PLACEMENT_RANDOM;
        }
        else if (p->first == "marker-density")
        {
            if (!marker) marker = sc.getOrCreateSymbol<MarkerSymbol>();
            marker->density() = as<float>(p->second, 1.0f);

//
// NOTE: run this sample from the repo/tests directory.
//
int main(int argc, char** argv)
{
    osg::ArgumentParser arguments(&argc,argv);

    bool useRaster  = arguments.read("--rasterize");
    bool useOverlay = arguments.read("--overlay");
    bool useStencil = arguments.read("--stencil");
    bool useMem     = arguments.read("--mem");
    bool useLabels  = arguments.read("--labels");

    osgViewer::Viewer viewer(arguments);

    // Start by creating the map:
    Map* map = new Map();

    // Start with a basemap imagery layer; we'll be using the GDAL driver
    // to load a local GeoTIFF file:
    GDALOptions basemapOpt;
    basemapOpt.url() = "../data/world.tif";
    map->addImageLayer( new ImageLayer( ImageLayerOptions("basemap", basemapOpt) ) );

    // Next we add a feature layer. First configure a feature driver to 
    // load the vectors from a shapefile:
    OGRFeatureOptions featureOpt;
    if ( !useMem )
    {
        featureOpt.url() = "../data/usa.shp";
    }
    else
    {
        Ring* line = new Ring();
        line->push_back( osg::Vec3d(-60, 20, 0) );
        line->push_back( osg::Vec3d(-120, 20, 0) );
        line->push_back( osg::Vec3d(-120, 60, 0) );
        line->push_back( osg::Vec3d(-60, 60, 0) );
        featureOpt.geometry() = line;
    }

    // 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() = osg::Vec4f( 1,1,0,1 ); // yellow
    ls->stroke()->width() = 2.0f;

    // Add some text labels.
    if ( useLabels )
    {
        TextSymbol* text = style.getOrCreateSymbol<TextSymbol>();
        text->provider() = "overlay";
        text->content() = StringExpression( "[name]" );
        text->priority() = NumericExpression( "[area]" );
        text->removeDuplicateLabels() = true;
        text->size() = 16.0f;
        text->fill()->color() = Color::White;
        text->halo()->color() = Color::DarkGray;
    }

    // That's it, the map is ready; now create a MapNode to render the Map:
    MapNodeOptions mapNodeOptions;
    mapNodeOptions.enableLighting() = false;

    MapNode* mapNode = new MapNode( map, mapNodeOptions );

    // Now we'll choose the AGG-Lite driver to render the features. By the way, the
    // feature data is actually polygons, so we override that to treat it as lines.
    // We apply the feature driver and set the style as well.
    if (useStencil)
    {
        FeatureStencilModelOptions worldOpt;
        worldOpt.featureOptions() = featureOpt;
        worldOpt.geometryTypeOverride() = Geometry::TYPE_LINESTRING;
        worldOpt.styles() = new StyleSheet();
        worldOpt.styles()->addStyle( style );
        worldOpt.enableLighting() = false;
        worldOpt.depthTestEnabled() = false;
        map->addModelLayer( new ModelLayer( "my features", worldOpt ) );
    }
    else if (useRaster)
    {
        AGGLiteOptions worldOpt;
        worldOpt.featureOptions() = featureOpt;
        worldOpt.geometryTypeOverride() = Geometry::TYPE_LINESTRING;
        worldOpt.styles() = new StyleSheet();
        worldOpt.styles()->addStyle( style );
        map->addImageLayer( new ImageLayer( ImageLayerOptions("world", worldOpt) ) );
    }
    else //if (useGeom || useOverlay)
    {
        FeatureGeomModelOptions worldOpt;
        worldOpt.featureOptions() = featureOpt;
        worldOpt.geometryTypeOverride() = Geometry::TYPE_LINESTRING;
        worldOpt.styles() = new StyleSheet();
        worldOpt.styles()->addStyle( style );
        worldOpt.enableLighting() = false;
        worldOpt.depthTestEnabled() = false;
//.........这里部分代码省略.........