关于OSG显示变化的数字的问题

zlulu2006

最近写OSG代码发现一个很奇怪的问题：其中主要代码如下

1. #include <osgDB/ReadFile>
   
2. #include <osgViewer/Viewer>
   
3. #include <osg/Node>
   
4. #include <osg/MatrixTransform>
   
5. #include <osgGA/MatrixManipulator>
   
6. 
   
7. #include <osg/Geode>
   
8. #include <osgText/Text>
   
9. #include <osgViewer/Viewer>
   
10. #include <osgDB/ReadFile>
    
11. #include <osgText/Font>
    
12. 
    
13. osgText::Text* t = new osgText::Text;
    
14. 
    
15. /*******************************************************************************/
    
16. //创建平面文字，即文字不随着场景的变化，一直显示在屏幕上
    
17. void createHUDText(osg::Camera* ca,osgText::Text* text)
    
18. {
    
19. osg::Group* rootNode = new osg::Group;//新建Group节点
    
20. 
    
21. osgText::Font* font = osgText::readFontFile("fonts/arial.ttf");//读取字体文件
    
22. 
    
23. osg::Geode* geode = new osg::Geode;//新建Geode节点
    
24. 
    
25. rootNode->addChild(geode);
    
26. 
    
27. float layoutCharacterSize = 50.0; //文字的大小
    
28. 
    
29. osg::Vec4 layoutColor(0.0f,1.0f,0.0f,1.0f);
    
30. text->setFont(font);
    
31. text->setColor(layoutColor);
    
32. text->setCharacterSize(150);
    
33. text->setPosition(osg::Vec3(800,0,0.0f));
    
34. text->setLayout(osgText::Text::LEFT_TO_RIGHT);
    
35. text->setDataVariance(osg::Object::DYNAMIC);
    
36. 
    
37. geode->addDrawable(text);
    
38. 
    
39. ca->addChild(rootNode);
    
40. }
    
41. 
    
42. 
    
43. class UseEventHandler : public osgGA::GUIEventHandler
    
44. {
    
45. public:
    
46. UseEventHandler()
    
47. {
    
48. btnLEFT=false;
    
49. btnRIGHT=false;
    
50. }
    
51. virtual bool handle(const osgGA::GUIEventAdapter & ea,osgGA::GUIActionAdapter & aa)
    
52. {
    
53. switch (ea.getEventType())
    
54. {
    
55. case osgGA::GUIEventAdapter::KEYDOWN:
    
56. {
    
57. if (ea.getKey() == 0xFF51 ||ea.getKey () == 0x41||ea.getKey () == 0x61) //A0x61
    
58. {
    
59. btnLEFT=true;
    
60. return true;
    
61. }
    
62. 
    
63. if (ea.getKey() == 0xFF53 ||ea.getKey () == 0x44||ea.getKey () == 0x64)//D
    
64. {
    
65. btnRIGHT=true;
    
66. return true;
    
67. }
    
68. return false;
    
69. case osgGA::GUIEventAdapter::KEYUP:
    
70. if (ea.getKey() == 0xFF51 ||ea.getKey () == 0x41||ea.getKey () == 0x61) //A
    
71. {
    
72. btnLEFT=false;
    
73. return true;
    
74. }
    
75. 
    
76. if (ea.getKey() == 0xFF53 ||ea.getKey () == 0x44||ea.getKey () == 0x64)//D
    
77. {
    
78. btnRIGHT=false;
    
79. return true;
    
80. }
    
81. }
    
82. break;
    
83. default:
    
84. break;
    
85. }
    
86. 
    
87. if (btnLEFT) //A
    
88. t->setText("1234");
    
89. 
    
90. if (btnRIGHT)//D
    
91. t->setText("5678");
    
92. }
    
93. 
    
94. };
    
95. 
    
96. void main()
    
97. {
    
98. osgViewer::Viewer viewer;
    
99. 
    
100. osg::ref_ptr<osg::Group> root = new osg::Group;
     
101. 
     
102. osg::ref_ptr<osg::Node> tank = new osg::Node;
     
103. 
     
104. osg::ref_ptr<osg::Node> terrain = new osg::Node;
     
105. 
     
106. osg::Camera* camera = new osg::Camera;//新建Camera相机节点，用于显示静态的文字，不跟随场景变动
     
107. 
     
108. camera->setReferenceFrame(osg::Transform::ABSOLUTE_RF);
     
109. camera->setProjectionMatrixAsOrtho2D(0,1440,0,900);
     
110. camera->setViewMatrix(osg::Matrix::identity());
     
111. camera->setClearMask(GL_DEPTH_BUFFER_BIT);
     
112. camera->getOrCreateStateSet()->setMode(GL_LIGHTING,osg::StateAttribute::OFF);
     
113. 
     
114. t->setText("radar");
     
115. createHUDText(camera,t);
     
116. 
     
117. root->addChild(camera);//将相机节点关联至场景的组节点
     
118. 
     
119. terrain = osgDB::readNodeFile("simple.osg");
     
120. 
     
121. tank = osgDB::readNodeFile("t72-tank_des.flt");
     
122. 
     
123. root->addChild(tank);
     
124. root->addChild(terrain);
     
125. 
     
126. viewer.setSceneData(root.get());
     
127. viewer.addEventHandler(new UseEventHandler());
     
128. viewer.realize();
     
129. viewer.run();
     
130. }

复制代码

编译运行后没有错误，但是在操作时，如果长时间按  A  D 按键（程序中设置的按键），会出现错误，自动退出程序，一直没有明白这是个什么问题

我用的是VS2008  OSG包是2.8.3
希望有人能解答下，小生谢谢了

array

我按照您说的方式运行了一段时间，没有出现问题

gis_wudi

运行操作后没出现问题