2.OsgEarth封装-编程知识

2.OsgEarth封装

环境：Osg3.6.5 OsgEarth3.2 Qt5.15.2

基于qt将osgEarth封装，在Qt中作为GLWidget进行呈现。

1.Earth类的封装

基于地球的初始化顺序进行了封装，并暴露出了一些必要的属性，类似viwer、map、mapNode等。最为重要的是widght属性，它是放置在qt中的重要承载物。

#pragma once#include "../osgqt/GraphicsWindowQt.h"#include <osgViewer/Viewer>
#include <osgDB/Registry>
#include <osgGA/StateSetManipulator> 
#include <osg/MatrixTransform>#include <osgEarth/Map> 
#include <osgEarth/GDAL> 
#include <osgEarth/MapNode> 
#include <osgEarth/EarthManipulator>
#include <osgEarth/Ephemeris>
#include <osgEarth/Sky> 
#include <osgEarth/XYZ>  #include <ctime>#include <QTimer>
#include <qobject.h>namespace Cv {class CvEarth{public:CvEarth();~CvEarth();osg::ref_ptr<osgViewer::Viewer> viewer;osg::ref_ptr<osg::Group> root;osg::ref_ptr<osg::Camera> camera;osg::ref_ptr<osgEarth::Map> map;osg::ref_ptr<osgEarth::MapNode> mapNode;osg::ref_ptr <osg::MatrixTransform> earthForm;osg::ref_ptr<osgEarth::EarthManipulator> em;osgQt::GLWidget* widget;private:void InitOSG();// 初始化设置osgvoid InitOsgearth();//初始化osgearthvoid InitSky();//天空初始化void InitUI();//界面初始化 time_t now_time;tm* t_tm;osg::ref_ptr<osgEarth::SkyNode> m_pSkyNode;//天空盒子节点};}

#include "CvEarth.h"Cv::CvEarth::CvEarth()
{InitOSG();InitOsgearth();InitUI();
}Cv::CvEarth::~CvEarth()
{
}void Cv::CvEarth::InitOSG()
{osgDB::Registry::instance()->addMimeTypeExtensionMapping("image/jpg;charset=utf8", "jpg");osgDB::Registry::instance()->addMimeTypeExtensionMapping("image/jpeg;charset=utf8", "jpg");osgDB::Registry::instance()->addMimeTypeExtensionMapping("image/png", "png");viewer = new osgViewer::Viewer;// 设置模型root = new osg::Group;//获取屏幕分辨率 长宽osg::GraphicsContext::WindowingSystemInterface* wsi = osg::GraphicsContext::getWindowingSystemInterface();if (!wsi)return;unsigned int width, height;wsi->getScreenResolution(osg::GraphicsContext::ScreenIdentifier(0), width, height);//设置图形环境特性osg::ref_ptr<osg::GraphicsContext::Traits> traits = new osg::GraphicsContext::Traits;traits->windowDecoration = false;//声明是否显示窗口的描述traits->x = 0;traits->y = 0;traits->width = width;traits->height = height;traits->doubleBuffer = true;//创建图形窗口是否使用双缓存//设置照相机camera = new osg::Camera;camera->setGraphicsContext(new osgQt::GraphicsWindowQt(traits.get()));camera->setClearColor(osg::Vec4(0.2, 0.2, 0.6, 1.0));camera->setViewport(new osg::Viewport(0, 0, width, height));camera->setProjectionMatrixAsPerspective(30.0f, (double(traits->width)) / (double(traits->height)), 1.0f, 10000.0f);//设置渲染器viewer->setCamera(camera);viewer->setSceneData(root);viewer->setThreadingModel(osgViewer::Viewer::SingleThreaded);//创建为单线程viewer->addEventHandler(new osgGA::StateSetManipulator(viewer->getCamera()->getOrCreateStateSet()));
}void Cv::CvEarth::InitOsgearth()
{map = new osgEarth::Map();mapNode = new  osgEarth::MapNode(map.get());earthForm = new osg::MatrixTransform;//osgearth操作器 用来设置osgearhem = new osgEarth::Util::EarthManipulator;if (mapNode.valid()){em->setNode(mapNode);}em->getSettings()->setArcViewpointTransitions(true);//设置osg渲染窗口viewer->setCameraManipulator(em);//初始化天空InitSky();
}void Cv::CvEarth::InitSky()
{//获取当前时间 初始化天空now_time = time(0);t_tm = localtime(&now_time);osgEarth::DateTime cur_date_time(now_time);osgEarth::Ephemeris* ephemeris = new osgEarth::Ephemeris;//设置黑夜明暗程度osgEarth::Util::SkyOptions skyOptions;skyOptions.ambient() = 0.3;m_pSkyNode = osgEarth::SkyNode::create(skyOptions);m_pSkyNode->setName("SkyNode");m_pSkyNode->setEphemeris(ephemeris);m_pSkyNode->setDateTime(cur_date_time);viewer->setLightingMode(osg::View::SKY_LIGHT);m_pSkyNode->attach(viewer, 0);m_pSkyNode->setLighting(true);m_pSkyNode->addChild(mapNode);root->addChild(m_pSkyNode);
}void Cv::CvEarth::InitUI()
{// ui布局osgQt::GraphicsWindowQt* gw = dynamic_cast<osgQt::GraphicsWindowQt*>(camera->getGraphicsContext());widget = (gw->getGLWidget());}

2.窗体中的使用

将封装的CvEarth引用进来，并添加到对应的布局中。

#include "MainForm.h"MainForm::MainForm(QWidget* parent): QMainWindow(parent)
{ui.setupUi(this);cvEarth = new Cv::CvEarth();//ui布局ui.mainLyt->addWidget(cvEarth->widget);_timer = new QTimer;QObject::connect(_timer, SIGNAL(timeout()), this, SLOT(updateFrame()));_timer->start(10);//窗口最大化this->setWindowState(Qt::WindowMaximized);this->setWindowTitle(QString::fromLocal8Bit("CvEarth")); }MainForm::~MainForm()
{}void MainForm::updateFrame()
{cvEarth->viewer->frame();
}