源代码：中级教程2：射线场景查询及基础鼠标用法

 win32控制台项目

 

需要的lib有

OgreMain_d.lib
OIS_d.lib
OgreGUIRenderer_d.lib
CEGUIBase_d.lib

 

源代码如下：

#include <CEGUI/CEGUISystem.h>#include <CEGUI/CEGUISchemeManager.h>#include <OgreCEGUIRenderer.h>#include "ExampleApplication.h"//1.首先，我们想要将鼠标右键绑定到“鼠标观察”模式。不能使用鼠标四下看看是相当郁闷的，// 所以我们首先对程序增加鼠标控制（尽管只是在我们保持鼠标右键按下时）。//2.我们想要让镜头不会穿过地表。这会使它更接近我们期望的样子。//3.我们想要在地表上用鼠标左键点击一下，就在那里增加一个实体。//4.最后，我们想要能“拖拽”实体。即选中我们想要看到的实体，按住鼠标左键不放，将它移动// 到我们想要放置的地方。松开鼠标左键，就又会将它锁定在原地。 class MouseQueryListener : public ExampleFrameListener, public OIS::MouseListener{public:MouseQueryListener(RenderWindow* win, Camera* cam, SceneManager *sceneManager, CEGUI::Renderer *renderer): ExampleFrameListener(win, cam, false, true), mGUIRenderer(renderer){ //由于地形相当小，所以我们也要减少移动和旋转速度mCount = 0;mCurrentObject = NULL;mLMouseDown = false;mRMouseDown = false;mSceneMgr = sceneManager;// Reduce move speedmMoveSpeed = 50;mRotateSpeed /= 500; //为了MouseQueryListener能收到鼠标事件，我们必须把它注册为一个鼠标监听器mMouse->setEventCallback(this);//最后在构造函数中我们需要创建一个RaySceneQuery对象。用场景管理器的一个调用创建mRaySceneQuery = mSceneMgr->createRayQuery(Ray());} // MouseQueryListener~MouseQueryListener(){// We created the query, and we are also responsible for deleting it.mSceneMgr->destroyQuery(mRaySceneQuery);}bool frameStarted(const FrameEvent &evt){ // Process the base frame listener code. Since we are going to be// manipulating the translate vector, we need this to happen first.if (!ExampleFrameListener::frameStarted(evt))return false;// Setup the scene queryVector3 camPos = mCamera->getPosition();Ray cameraRay(Vector3(camPos.x, 5000.0f, camPos.z), Vector3::NEGATIVE_UNIT_Y);mRaySceneQuery->setRay(cameraRay);// Perform the scene queryRaySceneQueryResult &result = mRaySceneQuery->execute();RaySceneQueryResult::iterator itr = result.begin(); // Get the results, set the camera heightif (itr != result.end() && itr->worldFragment){Real terrainHeight = itr->worldFragment->singleIntersection.y;if ((terrainHeight + 10.0f) > camPos.y)mCamera->setPosition( camPos.x, terrainHeight + 10.0f, camPos.z );}return true;//return ExampleFrameListener::frameStarted(evt);}/* MouseListener callbacks. 当鼠标被移动时，更新CEGUI（以便光标也移动） 当鼠标右键被按下时，设置mRMouseButton为true. 当鼠标右键被松开时，设置mRMouseButton为false 当鼠标被“拖拽”时，改变视图 当鼠标被“拖拽”时，隐藏鼠标光标 找到MouseQueryListener::mouseMoved方法。*/bool mouseMoved(const OIS::MouseEvent &arg){// Update CEGUI with the mouse motionCEGUI::System::getSingleton().injectMouseMove(arg.state.X.rel, arg.state.Y.rel);if (mLMouseDown){CEGUI::Point mousePos = CEGUI::MouseCursor::getSingleton().getPosition();Ray mouseRay = mCamera->getCameraToViewportRay(mousePos.d_x/float(arg.state.width),mousePos.d_y/float(arg.state.height));mRaySceneQuery->setRay(mouseRay);RaySceneQueryResult &result = mRaySceneQuery->execute();RaySceneQueryResult::iterator itr = result.begin();if (itr != result.end() && itr->worldFragment)mCurrentObject->setPosition(itr->worldFragment->singleIntersection);} // if// If we are dragging the right mouse button.else if (mRMouseDown){mCamera->yaw(Degree(-arg.state.X.rel * mRotateSpeed));mCamera->pitch(Degree(-arg.state.Y.rel * mRotateSpeed));} // else ifreturn true;}bool mousePressed(const OIS::MouseEvent &arg, OIS::MouseButtonID id){ // Left mouse button downif (id == OIS::MB_Left){// Setup the ray scene query, use CEGUI's mouse positionCEGUI::Point mousePos = CEGUI::MouseCursor::getSingleton().getPosition();Ray mouseRay = mCamera->getCameraToViewportRay(mousePos.d_x/float(arg.state.width), mousePos.d_y/float(arg.state.height));mRaySceneQuery->setRay(mouseRay);// Execute queryRaySceneQueryResult &result = mRaySceneQuery->execute();RaySceneQueryResult::iterator itr = result.begin( );// Get results, create a node/entity on the positionif (itr != result.end() && itr->worldFragment){char name[16];sprintf( name, "Robot%d", mCount++ );Entity *ent = mSceneMgr->createEntity(name, "robot.mesh");mCurrentObject = mSceneMgr->getRootSceneNode()->createChildSceneNode(String(name) + "Node", itr->worldFragment->singleIntersection);mCurrentObject->attachObject(ent);mCurrentObject->setScale(0.1f, 0.1f, 0.1f);} // ifmLMouseDown = true;} // if// Right mouse button downelse if (id == OIS::MB_Right){CEGUI::MouseCursor::getSingleton().hide();mRMouseDown = true;} // else ifreturn true;}bool mouseReleased(const OIS::MouseEvent &arg, OIS::MouseButtonID id){ // Left mouse button upif (id == OIS::MB_Left){mLMouseDown = false;} // if// Right mouse button upelse if (id == OIS::MB_Right){CEGUI::MouseCursor::getSingleton().show();mRMouseDown = false;} // else ifreturn true;}protected:RaySceneQuery *mRaySceneQuery; // 射线场景查询指针 ----> 握有RaySceneQuery的一个拷贝，我们会它来寻找地面上的坐标。bool mLMouseDown, mRMouseDown; // 如果按下鼠标按钮,返回True ---->会追踪我们是否按下鼠标键int mCount; // 屏幕上机器人的数量 SceneManager *mSceneMgr; // 指向场景管理器的指针 ---->（我们将用这个“拖拽”实体）SceneNode *mCurrentObject; // 新创建的物休CEGUI::Renderer *mGUIRenderer; // CEGUI渲染器 ---->握有指向CEGUI Renderer的指针，我们将用它更新CEGUI};class MouseQueryApplication : public ExampleApplication{protected:CEGUI::OgreCEGUIRenderer *mGUIRenderer;CEGUI::System *mGUISystem; // cegui systempublic:MouseQueryApplication(){}~MouseQueryApplication(){}protected:void chooseSceneManager(void){// Use the terrain scene manager.mSceneMgr = mRoot->createSceneManager(ST_EXTERIOR_CLOSE);}void createScene(void){// Set ambient lightmSceneMgr->setAmbientLight(ColourValue(0.5, 0.5, 0.5));mSceneMgr->setSkyDome(true, "Examples/CloudySky", 5, 8);// World geometrymSceneMgr->setWorldGeometry("terrain.cfg");// Set camera look pointmCamera->setPosition(40, 100, 580);mCamera->pitch(Degree(-30));mCamera->yaw(Degree(-45));// CEGUI setupmGUIRenderer = new CEGUI::OgreCEGUIRenderer(mWindow, Ogre::RENDER_QUEUE_OVERLAY, false, 3000, mSceneMgr);mGUISystem = new CEGUI::System(mGUIRenderer);// MouseCEGUI::SchemeManager::getSingleton().loadScheme((CEGUI::utf8*)"TaharezLookSkin.scheme");CEGUI::MouseCursor::getSingleton().setImage("TaharezLook", "MouseArrow");}void createFrameListener(void){mFrameListener = new MouseQueryListener(mWindow, mCamera, mSceneMgr, mGUIRenderer);mFrameListener->showDebugOverlay(true);mRoot->addFrameListener(mFrameListener);}};////////////////////////////////////////////////////////////////////////////////////#include "windows.h"int main(int argc, char **argv){// Create application objectMouseQueryApplication app;try {app.go();} catch( Exception& e ) {#if OGRE_PLATFORM == PLATFORM_WIN32 || OGRE_PLATFORM == OGRE_PLATFORM_WIN32//MessageBox( NULL, e.getFullDescription().c_str(), "An exception has occured!", MB_OK | MB_ICONERROR | MB_TASKMODAL);#elsefprintf(stderr, "An exception has occured: %s/n",e.getFullDescription().c_str());#endif}return 0;}