一个有限状态机的例子

#include <GL/glut.h> #include <stdlib.h> #pragma warning(disable: 4786) #include <algorithm> #include "Bullet.h" #include "Ship.h" #include "Ast.h" #include "Exp.h" #include "Powerup.h" #include "GameSession.h" #include "utility.h" #include "HumanControl.h" #include "FSMAIControl.h" #define INITIAL_WORLD_SIZE 512 //--------------------------------------------------------- GameSession::GameSession() { m_AIOn = false; m_timeScale = 1; m_humanControl = new HumanControl(); m_AIControl = new FSMAIControl(); } //--------------------------------------------------------- void GameSession::Draw() { GameObjectList::iterator li; switch(m_state) { case STATE_STEPWAIT: case STATE_STEP: case STATE_PLAY: for(li=m_activeObj.begin();li!=m_activeObj.end();++li) { GameObj* temp = *li; GameObj* temp2; li++; if(li != m_activeObj.end()) { temp2 = *li; } li--; if((*li)->m_active) (*li)->Draw(); } glPrintf(COLOR_GREEN,5,Game.m_screenH-20,20,"Score: %d\n",m_score); DrawLives(); if(m_AIOn)//debug text drawing { glPrintf(COLOR_GREEN,5,20,20,"AI ON\n"); glPrintf(COLOR_GREEN,80,20,20,"%s\n",m_AIControl->m_debugTxt); m_AIControl->m_debugTxt = ""; } break; case STATE_PAUSE: glPrintf(COLOR_BLUE,30,Game.m_screenH-100,75,"Game Paused\n"); glPrintf(COLOR_BLUE,30,Game.m_screenH-200,75," Press p\n"); break; case STATE_GAMEOVER: glPrintf(COLOR_RED,30,Game.m_screenH-100,75,"Game Over\n"); glPrintf(COLOR_WHITE,30,Game.m_screenH-200,60,"Start Again(y/n)\n"); glPrintf(COLOR_GREEN,30,Game.m_screenH-300,40,"Final Score: %d\n",m_score); break; case STATE_NEXTWAVE: glPrintf(COLOR_RED,30,Game.m_screenH-100,70,"Wave Completed\n"); glPrintf(COLOR_WHITE,30,Game.m_screenH-200,60,"Press Space Bar\n"); if(m_AIOn) Game.StartNextWave(); break; default: break; } glFinish(); } //--------------------------------------------------------- void GameSession::DrawLives() { glPushMatrix(); glDisable(GL_LIGHTING); glRotatef(90.0f,0,0,1); if(m_numLives <= 10) { //life triangles Point3f location(m_screenW-15,-m_screenH + 10,0); glTranslate(location); glScalef(3,3,1); for(int i = 1;i< m_numLives;i++) { glBegin(GL_LINE_LOOP); glColor3f(.5,.5,.5); glVertex3f(-3,-2+(10*i),0); glVertex3f( 4, 0+(10*i),0); glVertex3f(-3, 2+(10*i),0); glEnd(); } } else//just put up a number for more then 10 extra lives { glPrintf(COLOR_GREEN,Game.m_screenW-30,Game.m_screenH-20,20,"%d\n",m_numLives-1); Point3f location(m_screenW-15,-m_screenH +40,0); glTranslate(location); glScalef(3,3,1); glBegin(GL_LINE_LOOP); glColor3f(.5,.5,.5); glVertex3f(-3,-2,0); glVertex3f( 4, 0,0); glVertex3f(-3, 2,0); glEnd(); } glEnable(GL_LIGHTING); glPopMatrix(); } //--------------------------------------------------------- void GameSession::Clip(Point3f &p) { if(p.x() > m_screenW) p.x() -=m_screenW; if(p.y() > m_screenH) p.y() -=m_screenH; if(p.x() < 0) p.x() +=m_screenW; if(p.y() < 0) p.y() +=m_screenH; } //--------------------------------------------------------- void GameSession::PostGameObj(GameObj *obj) { m_activeObj.push_back(obj); } //--------------------------------------------------------- bool RemoveNotActive(GameObj* obj) { if(!obj->m_active) { delete obj; return true; } return false; } //--------------------------------------------------------- void GameSession::Update(float dt) { GameObjectList::iterator list1; for(list1=m_activeObj.begin();list1!=m_activeObj.end();++list1) { GameObj* temp = *list1; //update logic and positions if((*list1)->m_active) { (*list1)->Update(dt); Clip((*list1)->m_position); } else continue; //check for collisions if((*list1)->m_collisionFlags != GameObj::OBJ_NONE) { GameObjectList::iterator list2; for(list2=m_activeObj.begin();list2!=m_activeObj.end();++list2) { //the first obj may have already collided with something, making it inactive if(!(*list1)->m_active) continue; //don't collide with yourself if(list1 == list2) continue; if((*list2)->m_active && ((*list1)->m_collisionFlags & (*list2)->m_type) && (*list1)->IsColliding(*list2)) { (*list1)->Explode(); (*list1)->DoCollision((*list2)); } } } if(list1==m_activeObj.end()) break; } //get rid of inactive objects GameObjectList::iterator end = m_activeObj.end(); GameObjectList::iterator newEnd = remove_if(m_activeObj.begin(),m_activeObj.end(),RemoveNotActive); if(newEnd != end) m_activeObj.erase(newEnd,end); //check for no main ship, respawn if(m_mainShip == NULL || m_respawnTimer>=0.0f) { m_respawnTimer-=dt; if(m_respawnTimer<0.0f) { m_mainShip = new Ship; if(m_mainShip) { PostGameObj(m_mainShip); m_humanControl->SetShip(m_mainShip); m_AIControl->SetShip(m_mainShip); } } } //occasionally spawn a powerup m_powerupTimer-=dt; if(m_powerupTimer <0.0f) { m_powerupTimer = randflt()*6.0f + 4.0f; Powerup* pow = new Powerup; if(pow) { pow->m_position.x()= randflt()*m_screenW; pow->m_position.y()= randflt()*m_screenH; pow->m_position.z()= 0; pow->m_velocity.x()= randflt()*40 - 20; pow->m_velocity.y()= randflt()*40 - 20; pow->m_velocity.z()= 0; PostGameObj(pow); } } //check for additional life bonus each 10K points if(m_score >= m_bonusScore) { m_numLives++; m_bonusScore += BONUS_LIFE_SCORE; } //check for finished wave if(!m_numAsteroids) { m_waveNumber++; WaveOver(); } //check for finished game, and reset if(!m_numLives) GameOver(); m_humanControl->Update(dt); //update AI control, if turned on if(m_AIOn) m_AIControl->Update(dt); } //--------------------------------------------------------- void GameSession::UseControl(int control) { if(!m_mainShip)// && !Game.m_AIOn) return; switch(control) { case CONTROL_THRUST_ON: m_mainShip->ThrustOn(); break; case CONTROL_THRUST_REVERSE: m_mainShip->ThrustReverse(); break; case CONTROL_THRUST_OFF: m_mainShip->ThrustOff(); break; case CONTROL_RIGHT_ON: m_mainShip->TurnRight(); break; case CONTROL_LEFT_ON: m_mainShip->TurnLeft(); break; case CONTROL_STOP_TURN: m_mainShip->StopTurn(); break; case CONTROL_STOP: m_mainShip->Stop(); break; case CONTROL_SHOOT: m_mainShip->Shoot(); break; case CONTROL_HYPERSPACE: m_mainShip->Hyperspace(); break; case CONTROL_PAUSE: if(m_state == STATE_PLAY) m_state = STATE_PAUSE; else m_state = STATE_PLAY; break; case CONTROL_STEP: if(m_state == STATE_STEPWAIT || m_state == STATE_STEP) m_state = STATE_PLAY; else m_state = STATE_STEP; break; case CONTROL_AI_ON: m_AIOn = true; break; case CONTROL_AI_OFF: m_AIOn = false; break; default: break; } } //--------------------------------------------------------- void GameSession::StartGame() { m_mainShip = NULL; m_powerupTimer = 0.2f; m_waveNumber = 1; m_numLives = 3; m_numAsteroids = 0; m_respawnTimer = -1; m_AIControl->Init(); ResetScore(); StartNextWave(); } //--------------------------------------------------------- void GameSession::StartNextWave() { m_state = STATE_PLAY; LaunchA