标签：addEventHandler viewer Util 获取 osgEarth new include osg

#include<Windows.h>
#include<osgViewer/Viewer>
#include<osgDB/ReadFile>
#include<osgViewer/ViewerEventHandlers>
#include<osgGA/StateSetManipulator>
#include <osgEarthUtil/EarthManipulator>
#include <osgEarthUtil/ExampleResources>


class GetFrameRate :public osgGA::GUIEventHandler
{
public:
	GetFrameRate(osgEarth::Util::LabelControl* fpsLabelContral):fpsLabel(fpsLabelContral)
	{
		curFrameNum = 0;
		curTime = 0;
		nextFrameNum = 0;
		nextTime = 0;
		fps = 0;
	}

	bool handle(const osgGA::GUIEventAdapter&ea, osgGA::GUIActionAdapter&aa)
	{
		osgViewer::Viewer *viewer = dynamic_cast<osgViewer::Viewer*>(&aa);
		//获取帧率
		osg::FrameStamp* FS = viewer->getViewerFrameStamp();
		curFrameNum = FS->getFrameNumber();
		curTime = FS->getSimulationTime();
		if ((curTime - nextTime)<=0.005)
		{
		}
		else
		{ 
			fps = 1 / ((curTime - nextTime)); 
			char wsrc[512];
			sprintf(wsrc, "%.2f", fps);
			fpsLabel->setText(wsrc);
			std::cout << fps << std::endl;
		}

		nextFrameNum = FS->getFrameNumber();
		nextTime = FS->getSimulationTime();
		return false;
	}
public:
	double curFrameNum, curTime, nextFrameNum, nextTime;
	double fps;
	osgEarth::Util::LabelControl* fpsLabel;
};




int main()
{
	osg::ref_ptr<osgViewer::Viewer>viewer = new osgViewer::Viewer;

	//添加状态事件，可以相应键盘和鼠标事件，响应L T B W
	viewer->addEventHandler(new osgGA::StateSetManipulator(viewer->getCamera()->getOrCreateStateSet()));
	//窗口大小变化，响应F
	viewer->addEventHandler(new osgViewer::WindowSizeHandler);
	//添加路径记录 Z
	viewer->addEventHandler(new osgViewer::RecordCameraPathHandler);
	//帮助文档显示H
	viewer->addEventHandler(new osgViewer::HelpHandler);
	//截屏 C
	viewer->addEventHandler(new osgViewer::ScreenCaptureHandler);
	//添加一些常用状态设置，响应S
	viewer->addEventHandler(new osgViewer::StatsHandler);


	osg::ref_ptr<osg::Group>root = new osg::Group;
	root->addChild(osgDB::readNodeFile("cow.osg"));
	viewer->setSceneData(root.get());

	//contralLable显示信息
	osgEarth::Util::Grid* grid = new osgEarth::Util::Grid();
	//设置几个Label文字控件显示在场景中
	grid->setControl(1, 1, new osgEarth::Util::LabelControl("FPS:  "));
	osgEarth::Util::LabelControl* fpsLabelContral = grid->setControl(2, 1, new osgEarth::Util::LabelControl("60.0"));
	grid->setPosition(0, 50);

	//控件绘制容器
	osgEarth::Util::ControlCanvas* fpsCanvas = new osgEarth::Util::ControlCanvas();
	//将要显示的控件加入到root组节点中去
	root->addChild(fpsCanvas);
	fpsCanvas->addControl(grid);
	fpsCanvas->setNodeMask(1);


	//获取帧率
	viewer->addEventHandler(new GetFrameRate(fpsLabelContral));

	viewer->run();
	return 0;
}

标签：addEventHandler,viewer,Util,获取,osgEarth,new,include,osg
来源： https://blog.csdn.net/ljjjjjjjjjjj/article/details/123598736

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