前言

  上一篇编译了proj6.2.0、gdal3.2.1，本篇继续。

 

OsgEarth编译过程简介

  OsgEarth的编译，是基于Osg和OsgEarth结合在一起的，先要编译Osg，然后编译OsgEarth。OsgEarth的依赖库较多，分为上、中、下三篇，然后单独有一篇如何将编译好的osgEarth集成到Qt中。

 

目标：Qt5.15.x + VS2019 x64版本

 

演示Demo

  Demo基于Qt5.15.2 + vs2019 x64 + osg3.6.3 + osgEarth3.1。
  
  演示环境Demo下载地址：https://download.csdn.net/download/qq21497936/14984791

 

编译OsgEarth 3.1

步骤一：下载解压

   
  (备注：博主QQ群提供文件下载，博客首页有扫码加群)

步骤二：CMake配置，添加Curl

  

补充：没有添加Curl，则会报错如下：

  

步骤三：CMake配置，添加DGAL

   

补充：没有添加GDAL，则会报错如下：

  

步骤四：CMake配置，添加libZip

  

补充：没有添加libzip，则会报错如下：

  

步骤五：CMake配置，添加OSG

  

步骤六：CMake配置

  

步骤七：CMake生成工程

  

步骤八：打开工程编译

  

步骤九：编译错误“未定义GL_DYNAMIC_STORAGE_BIT”

  
  直接自己加个定义把，先找到他的定义：
  
  直接修改源码：
  

步骤十：编译成功

  
   

 

Demo源码

#include <osg/Notify>

#include <osgGA/StateSetManipulator>

#include <osgViewer/Viewer>

#include <osgViewer/ViewerEventHandlers>

#include <osgDB/WriteFile>

#include <osgEarth/MapNode>

#include <osgEarth/GDAL>

#include <osgEarth/ExampleResources>

#include <osgEarth/EarthManipulator>

#include <osgEarth/Style>

#include <osgEarth/OGRFeatureSource>

#include <osgEarth/FeatureModelLayer>

#include <osgEarth/FeatureImageLayer>

using namespace osgEarth;

using namespace osgEarth::Util;

const char* styles_css =

R"(

    p {

        altitude-clamping: terrain-drape;

        render-backface-culling: false;

    }

    p1: p{ fill: #ff3f3f9f; }

    p2: p{ fill: #3fff3f9f; }

    p3: p{ fill: #3f3fff9f; }

    p4: p{ fill: #ff3fff9f; }

    p5: p{ fill: #ffff3f9f; }

)";

const char* script_source =

R"(

    function getStyleClass()

    {

        // Exclude any countries beginning with the letter A:

        if ( feature.properties.name.charAt(0) === 'A' )

            return null;

        // If it starts with the letter C, return an inline style:

        if ( feature.properties.name.charAt(0) == 'C' )

            return '{ _fill: #ffc838; stroke: #8f8838; extrusion-height: 250000; }';

        // Otherwise, return a named style based on some calculations:

        var pop = parseFloat(feature.properties.pop);

        if      ( pop <= 14045470 )  return "p1";

        else if ( pop <= 43410900 )  return "p2";

        else if ( pop <= 97228750 )  return "p3";

        else if ( pop <= 258833000 ) return "p4";

        else                         return "p5";

    }

)";

int main(int argc, char** argv)

{

    osgEarth::initialize();

    osg::ArgumentParser arguments(&argc, argv);

    bool useRaster = arguments.read("--rasterize");

    bool useMem = arguments.read("--mem");

    bool useLabels = arguments.read("--labels");

    bool useDraping = arguments.read("--drape");

    bool useClamping = arguments.read("--clamp");

    bool useScript = arguments.read("--script");

    std::string outfile;

    arguments.read("--out", outfile);

    osgViewer::Viewer viewer(arguments);

    osg::ref_ptr<Map> map = new Map();

    GDALImageLayer* basemap = new GDALImageLayer();

    basemap->setURL("world.tif");

    map->addLayer(basemap);

    // Next we add a layer to provide the feature data.

    OGRFeatureSource* features = new OGRFeatureSource();

    features->setName("vector-data");

    if (useMem)

    {

        // the --mem options tells us to just make an in-memory geometry:

        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));

        features->setGeometry(line);

    }

    else

    {

        features->setURL("world.shp");

    }

    map->addLayer(features);

    Style style;

    LineSymbol* ls = style.getOrCreateSymbol<LineSymbol>();

    ls->stroke()->color() = Color::Yellow;

    ls->stroke()->width() = 2.0f;

    ls->tessellationSize()->set(100, Units::KILOMETERS);

    if (useDraping)

    {

        AltitudeSymbol* alt = style.getOrCreate<AltitudeSymbol>();

        alt->clamping() = alt->CLAMP_TO_TERRAIN;

        alt->technique() = alt->TECHNIQUE_DRAPE;

    }

    else if (useClamping)

    {

        AltitudeSymbol* alt = style.getOrCreate<AltitudeSymbol>();

        alt->clamping() = alt->CLAMP_TO_TERRAIN;

        alt->technique() = alt->TECHNIQUE_GPU;

        ls->tessellationSize()->set(100, Units::KILOMETERS);

        RenderSymbol* render = style.getOrCreate<RenderSymbol>();

        render->depthOffset()->enabled() = true;

    }

    if (useRaster)

    {

        FeatureImageLayer* layer = new FeatureImageLayer();

        layer->setFeatureSource(features);

        StyleSheet* sheet = new StyleSheet();

        sheet->addStyle(style);

        layer->setStyleSheet(sheet);

        map->addLayer(layer);

    }

    else

    {

        FeatureModelLayer* layer = new FeatureModelLayer();

        layer->setFeatureSource(features);

        StyleSheet* styleSheet = new StyleSheet();

        if (useScript)

        {

            styleSheet->addStylesFromCSS(styles_css);

            styleSheet->setScript(new StyleSheet::ScriptDef(script_source));

            styleSheet->addSelector(StyleSelector("default", StringExpression("getStyleClass()")));

        }

        else

        {

            styleSheet->addStyle(style);

        }

        layer->setStyleSheet(styleSheet);

        map->addLayer(layer);

    }

    if (useLabels && !useRaster)

    {

        Style labelStyle;

        TextSymbol* text = labelStyle.getOrCreateSymbol<TextSymbol>();

        text->content() = StringExpression("[name]");

        text->priority() = NumericExpression("[pop]");

        text->size() = 16.0f;

        text->alignment() = TextSymbol::ALIGN_CENTER_CENTER;

        text->fill()->color() = Color::White;

        text->halo()->color() = Color::DarkGray;

        StyleSheet* sheet = new StyleSheet();

        sheet->addStyle(labelStyle);

        FeatureModelLayer* fml = new FeatureModelLayer();

        fml->setName("Labels");

        fml->setFeatureSource(features);

        fml->setStyleSheet(sheet);

        map->addLayer(fml);

    }

    LayerVector layers;

    map->getLayers(layers);

    for (LayerVector::const_iterator i = layers.begin(); i != layers.end(); ++i)

    {

        Layer* layer = i->get();

        if (layer->getStatus().isError() &&

            layer->getEnabled())

        {

            OE_WARN << layer->getName() << " : " << layer->getStatus().toString() << std::endl;

        }

    }

    MapNode* mapNode = new MapNode(map.get());

    if (!outfile.empty())

    {

        OE_NOTICE << "Writing to " << outfile << std::endl;

        osgDB::writeNodeFile(*mapNode, outfile);

    }

    else

    {

        viewer.setSceneData(mapNode);

        viewer.setCameraManipulator(new EarthManipulator());

        MapNodeHelper().configureView(&viewer);

        return viewer.run();

    }

}
 
 

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