OSG学习：响应键盘鼠标示例

偏执的太偏执、 2022-06-13 08:20 268阅读 0赞

示例功能：示例里面有两个模型，一个是牛，另一个是飞机。鼠标右键时牛和飞机都隐藏，鼠标左键双击时牛和飞机都显示，按键盘上面的LEFT键，显示牛，按键盘上面的RIGHT键显示飞机。其中显示与隐藏节点使用的是setNodeMask(bool)。bool的值为0的时候是隐藏，1的时候是显示。

#include<osgDB\ReadFile>
    #include<osgViewer\Viewer>
    #include<osg\Node>
    
    class UseEventHandler :public osgGA::GUIEventHandler
    {
    public:
    	virtual bool handle(const osgGA::GUIEventAdapter& ea, osgGA::GUIActionAdapter& aa)
    	{
    		osgViewer::Viewer* viewer = dynamic_cast<osgViewer::Viewer*>(&aa);
    		if (!viewer)return false;
    
    		switch (ea.getEventType())
    		{
    		case osgGA::GUIEventAdapter::KEYDOWN:
    		{
    												if (ea.getKey() == 0xFF51)
    												{
    													viewer->getSceneData()->asGroup()->getChild(1)->setNodeMask(0);
    													viewer->getSceneData()->asGroup()->getChild(0)->setNodeMask(1);
    												}
    												if (ea.getKey() == 0xFF53)
    												{
    													viewer->getSceneData()->asGroup()->getChild(0)->setNodeMask(0);
    													viewer->getSceneData()->asGroup()->getChild(1)->setNodeMask(1);
    												}
    												break;
    		}
    		case osgGA::GUIEventAdapter::PUSH:
    			if (ea.getButton() == 4)
    			{
    				viewer->getSceneData()->asGroup()->getChild(0)->setNodeMask(0);
    				viewer->getSceneData()->asGroup()->getChild(1)->setNodeMask(0);
    			}
    			break;
    		case osgGA::GUIEventAdapter::DOUBLECLICK:
    			if (ea.getButton() == 1)
    			{
    				viewer->getSceneData()->asGroup()->getChild(0)->setNodeMask(1);
    				viewer->getSceneData()->asGroup()->getChild(1)->setNodeMask(1);
    			}
    			break;
    		default:
    			break;
    		}
    		return false;
    	}
    };
    
    void main()
    {
    	osgViewer::Viewer viewer;
    	osg::ref_ptr<osg::Group> root = new osg::Group();
    	root->addChild(osgDB::readNodeFile("cow.osg"));
    	root->addChild(osgDB::readNodeFile("glider.osg"));
    	viewer.setSceneData(root.get());
    	viewer.addEventHandler(new UseEventHandler);
    	viewer.realize();
    	viewer.run();
    }

结果图：

![Center][]

![Center 1][]

[Center]: /images/20220613/fd721d9dee104013909ca1826b05de41.png
[Center 1]: /images/20220613/85132f98e54949928161a792023e3005.png