osgearth介绍(转载)-feature_labels.earth

1 #include <osgDB/ReadFile>
2 #include <osgViewer/Viewer>
3 int main()
4 {
5 <span style="white-space:pre">    </span>osgViewer::Viewer viewer;
6 <span style="white-space:pre">    </span>viewer.setSceneData(osgDB::readNodeFile("glider.osg"));
7 <span style="white-space:pre">    </span>viewer.realize();
8 <span style="white-space:pre">    </span>return viewer.run();
9 }

 1 #include <osgDB/ReadFile>
 2 #include <osgViewer/Viewer>
 3 #include <osgViewer/ViewerEventHandlers>
 4 #include <osgGA/StateSetManipulator>
 5 int main()
 6 {
 7         osgViewer::Viewer viewer;
 8         viewer.setSceneData(osgDB::readNodeFile("glider.osg"));
 9         //添加状态事件
10 1:        viewer.addEventHandler( new osgGA::StateSetManipulator(viewer.getCamera()->getOrCreateStateSet()));
11         //窗口大小变化事件
12 2:        viewer.addEventHandler(new osgViewer::WindowSizeHandler);
13 <span style="white-space:pre">    </span>//添加一些常用状态设置
14 3:        viewer.addEventHandler(new osgViewer::StatsHandler);
15         viewer.realize();
16         return viewer.run();
17 }

<!--
osgEarth Sample

Demonstrates feature draping using projective texturing, 
i.e. "altitude-clamping: terrain-drape".
-->

<map name="Geometry Rasterizer Demo" type="round" version="2">
  
    <options>
        <lighting>false</lighting>
        <terrain min_lod="16"/>
    </options>

    <image name="world" driver="gdal">
        <url>../data/world.tif</url>
        <cache_policy usage="no_cache"/>
    </image>
    
   <model name="world_boundaries" driver="feature_geom">

        <features name="earth" driver="ogr">
            <url>../data/world.shp</url>
            <build_spatial_index>true</build_spatial_index>
        </features>

        <styles>
            <style type="text/css">
                world {
                   stroke:             #ffff00;
                   stroke-width:       5px;
                   altitude-clamping:  terrain-drape;
                }
            </style>
        </styles>

    </model>

    <extensions>
        <graticule>
            <!-- The approximate number of grid lines that you would like to see in your view extent.
                 This number, along with the resolutions list, will be used to select a resolution on each view.
             -->
            <grid_lines>10</grid_lines>

            <!-- The grid resolutions, in degrees that you want to see, all separated by a space and sorted from lowest resolution to highest -->
            <!--
            <resolutions>10 5 2.5 1.25</resolutions>
             -->

            <!-- The grid line color -->
            <color>#f7a73f70</color>

            <!-- The label color -->
            <label_color>#ffff00ff</label_color>

            <!-- Specify the line width -->
            <line_width>2</line_width>
        </graticule>
    </extensions>

    <model name="cities" driver="feature_geom">

        <features name="cities" driver="ogr">
            <url>../data/world.shp</url>

                        <!--Define a ChangeAttributeFilter, which is defined in the osgearth_featurefilter example.  This will change the cntry_name of all countries to osgEarthLand.-->
                        <change_attribute key="cntry_name" value="osgEarthLand"/>
        </features>

        <styles>
            <style type="text/css">
                cities {
                   text-provider:  annotation;
                   text-content:   [cntry_name];
                   text-priority:  [pop_cntry];
                   text-halo:      #3f3f7f;
                   text-align:     center_center;
                   text-declutter: true;
                }
            </style>
        </styles>

    </model>

  
</map>

<!--
osgEarth Sample
This shows how to label point features with an attribute.
-->

<map name="Feature Geometry Demo" type="geocentric" version="2">
        
    <image name="world" driver="gdal">
        <url>../data/world.tif</url>
    </image>
    
    <model name="cities" driver="feature_geom">

        <features name="cities" driver="ogr">
            <url>../data/world.shp</url>
        </features>

        <styles>
            <style type="text/css">              
                cities {
                   text-provider: annotation;
                   text-content:  [cntry_name];
                   text-priority: [pop_cntry];
                   text-halo:     #3f3f7f;
                   text-align:    center_center;
                }     
            </style>
        </styles>
        
    </model>
    
    <options lighting="false"/>
    
    <external>
        <decluttering>
            <out_animation_time>  0.0  </out_animation_time>
            <in_animation_time>   0.25 </in_animation_time>
            <min_animation_scale> 0.45 </min_animation_scale>
            <min_animation_alpha> 0.35 </min_animation_alpha>
            <sort_by_priority>    true </sort_by_priority>
        </decluttering>
    </external>
  
</map>