osgkeyboard例子详解

技术2022-05-18 13

osgkeyboard例子中包含的内容:

(1)显示文本osgText.

(2)在viewer中添加事件处理:GUIEventHandler.

解析如下:

class KeyboardModel : public osg::Referenced{public:

KeyboardModel() { createKeyboard(); } osg::Group* getScene() { return _scene.get(); } void keyChange(int key,int value);//每当用户按下或松开按钮时调用 protected: ~KeyboardModel() {}

osg::Switch* addKey(osg::Vec3& pos, int key,const std::string& text,float width, float height); osg::Switch* addKey(int key,osg::Switch* sw);

void createKeyboard();//构造函数中调用

typedef std::map<int, osg::ref_ptr<osg::Switch> > KeyModelMap; osg::ref_ptr<osg::Group> _scene;//场景节点 KeyModelMap _keyModelMap;//map(字符ID,开关节点),如_keyModelMap["P"] = switch osg::ref_ptr<osgText::Text> _inputText;//显示的文本(会随着按键而改变)

};

void KeyboardModel::keyChange(int key,int value){ // toggle the keys graphical representation on or off via osg::Swithc KeyModelMap::iterator itr = _keyModelMap.find(key); if (itr!=_keyModelMap.end()) { itr->second->setSingleChildOn(value); //itr->second即找到的switch,例_keyModelMap["P"] = switch,则switch只打开一个(setSingleChildOn()), //当按下"P"时,由于KeyboardEventHandler::handle()中_keyboardModel->keyChange(ea.getKey(),1);表示显示 //的索引值是1(即第2个红色的),否则如果按键松开,则显示的索引值是0(第一个白色的). } if (value)//只有当用户按下某个键时,value=1. { // when a key is pressed add the new data to the text field if (key>0 && key<256) { // just add ascii characters right now... _inputText->getText().push_back(key);//直接将输入的字符添加,会显示出来 _inputText->update(); } else if (key==osgGA::GUIEventAdapter::KEY_Return) { _inputText->getText().push_back('/n');//换行 _inputText->update(); } else if (key==osgGA::GUIEventAdapter::KEY_BackSpace || key==osgGA::GUIEventAdapter::KEY_Delete) { if (!_inputText->getText().empty()) { _inputText->getText().pop_back();//删除 _inputText->update(); } } } }

osg::Switch* KeyboardModel::addKey(osg::Vec3& pos, int key,const std::string& text,float width, float height){

osg::Geode* geodeUp = new osg::Geode;//第1个字符(白色) { osgText::Text* textUp = new osgText::Text; textUp->setFont("fonts/arial.ttf"); textUp->setColor(osg::Vec4(1.0f,1.0f,1.0f,1.0f));//(白色) textUp->setCharacterSize(height); textUp->setPosition(pos); textUp->setDrawMode(osgText::Text::TEXT/*|osgText::Text::BOUNDINGBOX*/); textUp->setAlignment(osgText::Text::LEFT_CENTER); textUp->setAxisAlignment(osgText::Text::XZ_PLANE); textUp->setText(text); geodeUp->addDrawable(textUp); } osg::Geode* geodeDown = new osg::Geode;//第2个字符(红色) { osgText::Text* textDown = new osgText::Text; textDown->setFont("fonts/arial.ttf"); textDown->setColor(osg::Vec4(1.0f,0.0f,1.0f,1.0f));//(红色) textDown->setCharacterSize(height); textDown->setPosition(pos); textDown->setDrawMode(osgText::Text::TEXT/*||osgText::Text::BOUNDINGBOX*/); textDown->setAlignment(osgText::Text::LEFT_CENTER); textDown->setAxisAlignment(osgText::Text::XZ_PLANE); textDown->setText(text); geodeDown->addDrawable(textDown); }

osg::Switch* model = new osg::Switch;//开关节点,添加2个Geode,且每次只能一个打开,即只显示一个 model->addChild(geodeUp,true); model->addChild(geodeDown,false); _scene->addChild(model);//加入_scene

_keyModelMap[key] = model;//例_keyModelMap["P"] = model pos.x() += width; return model; }

osg::Switch* KeyboardModel::addKey(int key,osg::Switch* sw){ _keyModelMap[key] = sw;//例_keyModelMap["p"]= _keyModelMap["P"] = switch return sw;}

void KeyboardModel::createKeyboard(){ _scene = new osg::Group; osg::Vec3 origin(0.0f,0.0f,0.0f); osg::Vec3 pos=origin; addKey(pos,osgGA::GUIEventAdapter::KEY_Control_L,"Ctrl",2.0f,0.5f); ...... addKey('P',addKey(pos,'p',"P",1.0f,1.0f)); //括号里的addKey()表示,对于"p",显示为"P",然后括号外的addKey(),第二个参数使用同样的switch, //即大小写P都用同一个switch,且_keyModelMap["p"]= _keyModelMap["P"] = switch ... pos.x() = 0.0f; pos.z() += 1.0f; ...... }

class KeyboardEventHandler : public osgGA::GUIEventHandler{public: KeyboardEventHandler(KeyboardModel* keyboardModel): _keyboardModel(keyboardModel) {} virtual bool handle(const osgGA::GUIEventAdapter& ea,osgGA::GUIActionAdapter&) {

...... switch(ea.getEventType()) { case(osgGA::GUIEventAdapter::KEYDOWN): { //keyChange()第二个参数:0表示第一个显示字符(绿色),1表示第二个显示字符(红色). //switch开关使红色字符显示 _keyboardModel->keyChange(ea.getKey(),1); return true;//返回true后,别的EventHandler不会处理了,该按键事件处理完毕 } case(osgGA::GUIEventAdapter::KEYUP): { _keyboardModel->keyChange(ea.getKey(),0); return true; }

default: return false; } } osg::ref_ptr<KeyboardModel> _keyboardModel;//数据成员,以便处理按键时能找到对象指针() };

int main(int , char **){ osgViewer::Viewer viewer;

osg::ref_ptr<KeyboardModel> keyboardModel = new KeyboardModel;

...... viewer.addEventHandler(new KeyboardEventHandler(keyboardModel.get())); viewer.setSceneData( keyboardModel->getScene() );

return viewer.run();}

========================

完整的osgkeyboard代码如下:

#include <osgViewer/Viewer>#include <osgViewer/ViewerEventHandlers>#include <osg/io_utils>

#include <osg/MatrixTransform>#include <osg/Geode>#include <osg/Group>#include <osg/Switch>#include <osg/Notify>#include <osg/Geometry>

#include <osgText/Text>

#include <osgDB/Registry>#include <osgDB/ReadFile>#include <osgDB/WriteFile>

class KeyboardModel : public osg::Referenced{public:

KeyboardModel() { createKeyboard(); } osg::Group* getScene() { return _scene.get(); } void keyChange(int key,int value); protected: ~KeyboardModel() {}

osg::Switch* addKey(osg::Vec3& pos, int key,const std::string& text,float width, float height); osg::Switch* addKey(int key,osg::Switch* sw);

void createKeyboard();

typedef std::map<int, osg::ref_ptr<osg::Switch> > KeyModelMap; osg::ref_ptr<osg::Group> _scene; KeyModelMap _keyModelMap; osg::ref_ptr<osgText::Text> _inputText;

};

void KeyboardModel::keyChange(int key,int value){ osg::notify(osg::INFO) << "key value change, code="<<std::hex << key << "/t value="<< value << std::dec << std::endl;

// toggle the keys graphical representation on or off via osg::Swithc KeyModelMap::iterator itr = _keyModelMap.find(key); if (itr!=_keyModelMap.end()) { itr->second->setSingleChildOn(value); } if (value) { // when a key is pressed add the new data to the text field if (key>0 && key<256) { // just add ascii characters right now... _inputText->getText().push_back(key); _inputText->update(); } else if (key==osgGA::GUIEventAdapter::KEY_Return) { _inputText->getText().push_back('/n'); _inputText->update(); } else if (key==osgGA::GUIEventAdapter::KEY_BackSpace || key==osgGA::GUIEventAdapter::KEY_Delete) { if (!_inputText->getText().empty()) { _inputText->getText().pop_back(); _inputText->update(); } } } }

osg::Switch* KeyboardModel::addKey(osg::Vec3& pos, int key,const std::string& text,float width, float height){

osg::Geode* geodeUp = new osg::Geode; { osgText::Text* textUp = new osgText::Text; textUp->setFont("fonts/arial.ttf"); textUp->setColor(osg::Vec4(1.0f,1.0f,1.0f,1.0f)); textUp->setCharacterSize(height); textUp->setPosition(pos); textUp->setDrawMode(osgText::Text::TEXT/*|osgText::Text::BOUNDINGBOX*/); textUp->setAlignment(osgText::Text::LEFT_CENTER); textUp->setAxisAlignment(osgText::Text::XZ_PLANE); textUp->setText(text); geodeUp->addDrawable(textUp); } osg::Geode* geodeDown = new osg::Geode; { osgText::Text* textDown = new osgText::Text; textDown->setFont("fonts/arial.ttf"); textDown->setColor(osg::Vec4(1.0f,0.0f,1.0f,1.0f)); textDown->setCharacterSize(height); textDown->setPosition(pos); textDown->setDrawMode(osgText::Text::TEXT/*||osgText::Text::BOUNDINGBOX*/); textDown->setAlignment(osgText::Text::LEFT_CENTER); textDown->setAxisAlignment(osgText::Text::XZ_PLANE); textDown->setText(text); geodeDown->addDrawable(textDown); }

osg::Switch* model = new osg::Switch; model->addChild(geodeUp,true); model->addChild(geodeDown,false); _scene->addChild(model);

_keyModelMap[key] = model; pos.x() += width; return model; }

osg::Switch* KeyboardModel::addKey(int key,osg::Switch* sw){ _keyModelMap[key] = sw; return sw;}

void KeyboardModel::createKeyboard(){ _scene = new osg::Group; osg::Vec3 origin(0.0f,0.0f,0.0f); osg::Vec3 pos=origin; addKey(pos,osgGA::GUIEventAdapter::KEY_Control_L,"Ctrl",2.0f,0.5f); addKey(pos,osgGA::GUIEventAdapter::KEY_Super_L,"Super",2.0f,0.5f); addKey(pos,osgGA::GUIEventAdapter::KEY_Alt_L,"Alt",2.0f,0.5f); addKey(pos,osgGA::GUIEventAdapter::KEY_Space,"Space",3.0f,1.0f); addKey(pos,osgGA::GUIEventAdapter::KEY_Mode_switch,"Switch",2.0f,0.5f); addKey(pos,osgGA::GUIEventAdapter::KEY_Super_R,"Super",2.0f,0.5f); addKey(pos,osgGA::GUIEventAdapter::KEY_Menu,"Menu",2.0f,0.5f); addKey(pos,osgGA::GUIEventAdapter::KEY_Control_R,"Ctrl",2.0f,0.5f);

osg::Vec3 middle(pos.x()+1.0f,0.0f,0.0f); pos.x() = 0.0f; pos.z() += 1.0f;

addKey(pos,osgGA::GUIEventAdapter::KEY_Shift_L,"Shift",2.0f,0.5f); addKey(pos,'//',"//",1.0f,1.0f); addKey('Z',addKey(pos,'z',"Z",1.0f,1.0f)); addKey('X',addKey(pos,'x',"X",1.0f,1.0f)); addKey('C',addKey(pos,'c',"C",1.0f,1.0f)); addKey('V',addKey(pos,'v',"V",1.0f,1.0f)); addKey('B',addKey(pos,'b',"B",1.0f,1.0f)); addKey('N',addKey(pos,'n',"N",1.0f,1.0f)); addKey('M',addKey(pos,'m',"M",1.0f,1.0f)); addKey('<',addKey(pos,',',",",1.0f,1.0f)); addKey('>',addKey(pos,'.',".",1.0f,1.0f)); addKey('?',addKey(pos,'/',"/",1.0f,1.0f)); addKey(pos,osgGA::GUIEventAdapter::KEY_Shift_R,"Shift",2.0f,0.5f);

pos.x() = 0.0f; pos.z() += 1.0f; addKey(pos,osgGA::GUIEventAdapter::KEY_Caps_Lock,"Caps",2.0f,0.5f); addKey('A',addKey(pos,'a',"A",1.0f,1.0f)); addKey('S',addKey(pos,'s',"S",1.0f,1.0f)); addKey('D',addKey(pos,'d',"D",1.0f,1.0f)); addKey('F',addKey(pos,'f',"F",1.0f,1.0f)); addKey('G',addKey(pos,'g',"G",1.0f,1.0f)); addKey('H',addKey(pos,'h',"H",1.0f,1.0f)); addKey('J',addKey(pos,'j',"J",1.0f,1.0f)); addKey('K',addKey(pos,'k',"K",1.0f,1.0f)); addKey('L',addKey(pos,'l',"L",1.0f,1.0f)); addKey(':',addKey(pos,';',";",1.0f,1.0f)); addKey('@',addKey(pos,'/'',"'",1.0f,1.0f)); addKey('~',addKey(pos,'#',"#",1.0f,1.0f)); addKey(pos,osgGA::GUIEventAdapter::KEY_Return,"Return",4.0f,0.5f);

pos.x() = 0.0f; pos.z() += 1.0f; addKey(pos,osgGA::GUIEventAdapter::KEY_Tab,"Tab",2.0f,0.5f); addKey('Q',addKey(pos,'q',"Q",1.0f,1.0f)); addKey('W',addKey(pos,'w',"W",1.0f,1.0f)); addKey('E',addKey(pos,'e',"E",1.0f,1.0f)); addKey('R',addKey(pos,'r',"R",1.0f,1.0f)); addKey('T',addKey(pos,'t',"T",1.0f,1.0f)); addKey('Y',addKey(pos,'y',"Y",1.0f,1.0f)); addKey('U',addKey(pos,'u',"U",1.0f,1.0f)); addKey('I',addKey(pos,'i',"I",1.0f,1.0f)); addKey('O',addKey(pos,'o',"O",1.0f,1.0f)); addKey('P',addKey(pos,'p',"P",1.0f,1.0f)); addKey('{',addKey(pos,'[',"[",1.0f,1.0f)); addKey('}',addKey(pos,']',"]",1.0f,1.0f));

pos.x() = 0.0f; pos.z() += 1.0f; addKey(pos,'`',"`",1.0f,1.0f); addKey(pos,'1',"1",1.0f,1.0f); addKey(pos,'2',"2",1.0f,1.0f); addKey(pos,'3',"3",1.0f,1.0f); addKey(pos,'4',"4",1.0f,1.0f); addKey(pos,'5',"5",1.0f,1.0f); addKey(pos,'6',"6",1.0f,1.0f); addKey(pos,'7',"7",1.0f,1.0f); addKey(pos,'8',"8",1.0f,1.0f); addKey(pos,'9',"9",1.0f,1.0f); addKey(pos,'0',"0",1.0f,1.0f); addKey(pos,'-',"-",1.0f,1.0f); addKey(pos,'=',"=",1.0f,1.0f); addKey(pos,osgGA::GUIEventAdapter::KEY_BackSpace,"Backspace",3.0f,0.5f);

pos.x() = 0.0f; pos.z() += 1.5f; float F_height = 0.5f; addKey(pos,osgGA::GUIEventAdapter::KEY_Escape,"Esc",2.0f,F_height); addKey(pos,osgGA::GUIEventAdapter::KEY_F1,"F1",1.0f,F_height); addKey(pos,osgGA::GUIEventAdapter::KEY_F2,"F2",1.0f,F_height); addKey(pos,osgGA::GUIEventAdapter::KEY_F3,"F3",1.0f,F_height); addKey(pos,osgGA::GUIEventAdapter::KEY_F4,"F4",1.0f,F_height); addKey(pos,osgGA::GUIEventAdapter::KEY_F5,"F5",1.0f,F_height); addKey(pos,osgGA::GUIEventAdapter::KEY_F6,"F6",1.0f,F_height); addKey(pos,osgGA::GUIEventAdapter::KEY_F7,"F7",1.0f,F_height); addKey(pos,osgGA::GUIEventAdapter::KEY_F8,"F8",1.0f,F_height); addKey(pos,osgGA::GUIEventAdapter::KEY_F9,"F9",1.0f,F_height); addKey(pos,osgGA::GUIEventAdapter::KEY_F10,"F10",1.0f,F_height); addKey(pos,osgGA::GUIEventAdapter::KEY_F11,"F11",1.0f,F_height); addKey(pos,osgGA::GUIEventAdapter::KEY_F12,"F12",1.0f,F_height);

float cursorMoveHeight=0.35f;

pos = middle; addKey(pos,osgGA::GUIEventAdapter::KEY_Left,"Left",1.0f,cursorMoveHeight); osg::Vec3 down = pos; addKey(pos,osgGA::GUIEventAdapter::KEY_Down,"Down",1.0f,cursorMoveHeight); addKey(pos,osgGA::GUIEventAdapter::KEY_Right,"Right",1.0f,cursorMoveHeight); osg::Vec3 keypad = pos; keypad.x()+=1.0f;

pos = down; pos.z() += 1.0f; addKey(pos,osgGA::GUIEventAdapter::KEY_Up,"Up",1.0f,cursorMoveHeight);

float homeHeight = 0.35f; pos = middle; pos.z() += 3.0; addKey(pos,osgGA::GUIEventAdapter::KEY_Delete,"Delete",1.0f,homeHeight); addKey(pos,osgGA::GUIEventAdapter::KEY_End,"End",1.0f,homeHeight); addKey(pos,osgGA::GUIEventAdapter::KEY_Page_Down,"Page/nDown",1.0f,homeHeight); pos = middle; pos.z() += 4.0; addKey(pos,osgGA::GUIEventAdapter::KEY_Insert,"Insert",1.0f,homeHeight); addKey(pos,osgGA::GUIEventAdapter::KEY_Home,"Home",1.0f,homeHeight); addKey(pos,osgGA::GUIEventAdapter::KEY_Page_Up,"Page/nUp",1.0f,homeHeight);

pos = middle; pos.z() += 5.5; addKey(pos,osgGA::GUIEventAdapter::KEY_Print,"PrtScrn/nSysRq",1.0f,homeHeight); addKey(pos,osgGA::GUIEventAdapter::KEY_Scroll_Lock,"ScrLk",1.0f,homeHeight); addKey(pos,osgGA::GUIEventAdapter::KEY_Pause,"Pause/nBreak",1.0f,homeHeight);

pos = keypad; addKey(pos,osgGA::GUIEventAdapter::KEY_KP_Insert,"0",2.0f,1.0f); addKey(pos,osgGA::GUIEventAdapter::KEY_KP_Delete,".",1.0f,1.0f); addKey(pos,osgGA::GUIEventAdapter::KEY_KP_Enter,"Enter",1.0f,homeHeight); pos = keypad; pos.z() += 1.0f; addKey(pos,osgGA::GUIEventAdapter::KEY_KP_End,"1",1.0f,1.0f); addKey(pos,osgGA::GUIEventAdapter::KEY_KP_Down,"2",1.0f,1.0f); addKey(pos,osgGA::GUIEventAdapter::KEY_KP_Page_Down,"3",1.0f,1.0f);

pos = keypad; pos.z() += 2.0f; addKey(pos,osgGA::GUIEventAdapter::KEY_KP_Left,"4",1.0f,1.0f); addKey(pos,osgGA::GUIEventAdapter::KEY_KP_Begin,"5",1.0f,1.0f); addKey(pos,osgGA::GUIEventAdapter::KEY_KP_Right,"6",1.0f,1.0f); addKey(pos,osgGA::GUIEventAdapter::KEY_KP_Add,"+",1.0f,1.0f);

pos = keypad; pos.z() += 3.0f; addKey(pos,osgGA::GUIEventAdapter::KEY_KP_Home,"7",1.0f,1.0f); addKey(pos,osgGA::GUIEventAdapter::KEY_KP_Up,"8",1.0f,1.0f); addKey(pos,osgGA::GUIEventAdapter::KEY_KP_Page_Up,"9",1.0f,1.0f);

pos = keypad; pos.z() += 4.0f; addKey(pos,osgGA::GUIEventAdapter::KEY_Num_Lock,"Num/nLock",1.0f,0.3f); addKey(pos,osgGA::GUIEventAdapter::KEY_KP_Divide,"/",1.0f,1.0f); addKey(pos,osgGA::GUIEventAdapter::KEY_KP_Multiply,"*",1.0f,1.0f); addKey(pos,osgGA::GUIEventAdapter::KEY_KP_Subtract,"-",1.0f,1.0f); float totalWidth = pos.x()-origin.x(); pos = origin; pos.z() += -1.5f;

osg::Geode* geodeInput = new osg::Geode; { _inputText = new osgText::Text; _inputText->setFont("fonts/arial.ttf"); _inputText->setColor(osg::Vec4(1.0f,1.0f,0.0f,1.0f)); _inputText->setCharacterSize(1.0f); _inputText->setMaximumWidth(totalWidth); _inputText->setPosition(pos); _inputText->setDrawMode(osgText::Text::TEXT/*||osgText::Text::BOUNDINGBOX*/); _inputText->setAlignment(osgText::Text::BASE_LINE); _inputText->setAxisAlignment(osgText::Text::XZ_PLANE); _inputText->setDataVariance(osg::Object::DYNAMIC); _inputText->setText("Press some keys..."); geodeInput->addDrawable(_inputText.get()); _scene->addChild(geodeInput); }

}

#if 1

// osg::notify(osg::NOTICE)<<"Mouse "<<ea.getButtonMask()<<std::endl;

#define PRINT(mask) osg::notify(osg::NOTICE)<<#mask<<" ="<<(ea.getModKeyMask() & mask)<<std::endl; switch(ea.getEventType()) { case(osgGA::GUIEventAdapter::KEYDOWN): case(osgGA::GUIEventAdapter::KEYUP): { osg::notify(osg::NOTICE)<<std::endl; PRINT(osgGA::GUIEventAdapter::MODKEY_LEFT_SHIFT); PRINT(osgGA::GUIEventAdapter::MODKEY_RIGHT_SHIFT); PRINT(osgGA::GUIEventAdapter::MODKEY_LEFT_ALT); PRINT(osgGA::GUIEventAdapter::MODKEY_RIGHT_ALT); PRINT(osgGA::GUIEventAdapter::MODKEY_LEFT_CTRL); PRINT(osgGA::GUIEventAdapter::MODKEY_RIGHT_CTRL); PRINT(osgGA::GUIEventAdapter::MODKEY_LEFT_META); PRINT(osgGA::GUIEventAdapter::MODKEY_RIGHT_META); PRINT(osgGA::GUIEventAdapter::MODKEY_LEFT_SUPER); PRINT(osgGA::GUIEventAdapter::MODKEY_RIGHT_SUPER); PRINT(osgGA::GUIEventAdapter::MODKEY_LEFT_HYPER); PRINT(osgGA::GUIEventAdapter::MODKEY_RIGHT_HYPER); PRINT(osgGA::GUIEventAdapter::MODKEY_NUM_LOCK); PRINT(osgGA::GUIEventAdapter::MODKEY_CAPS_LOCK); break; } default: break; }#endif switch(ea.getEventType()) { case(osgGA::GUIEventAdapter::KEYDOWN): { _keyboardModel->keyChange(ea.getKey(),1); return true; } case(osgGA::GUIEventAdapter::KEYUP): { _keyboardModel->keyChange(ea.getKey(),0); return true; }

default: return false; } } osg::ref_ptr<KeyboardModel> _keyboardModel; };

int main(int , char **){ osgViewer::Viewer viewer;

osg::ref_ptr<KeyboardModel> keyboardModel = new KeyboardModel;

viewer.addEventHandler(new osgViewer::StatsHandler); viewer.addEventHandler(new osgViewer::WindowSizeHandler()); viewer.addEventHandler(new KeyboardEventHandler(keyboardModel.get())); viewer.setSceneData( keyboardModel->getScene() );

return viewer.run();}

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