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Bullet.cpp
资源名称：tanksrc.zip　[点击查看]
上传用户：royluo
上传日期：2007-01-05
资源大小：1584k
文件大小：5k
源码类别：

游戏

开发平台：

Visual C++

Bullet.cpp：源码内容
  1. /*****************************************************************************
  2. *                                                                             
  3. *   Bullet.cpp                                                            
  4. *                                                                             
  5. *   Electrical Engineering Faculty - Software Lab                             
  6. *   Spring semester 1998                                                      
  7. *                                                                             
  8. *   Tanks game                                                                
  9. *                                                                             
  10. *   Module description: Implements the bullet object.
  11. *                       
  12. *                                                                             
  13. *   Authors: Eran Yariv - 28484475                                           
  14. *            Moshe Zur  - 24070856                                           
  15. *                                                                            
  16. *                                                                            
  17. *   Date: 23/09/98                                                           
  18. *                                                                            
  19. ******************************************************************************/
  20. #include <stdafx.h>
  21. #include <Bullet.h>
  23. CBullet::CBullet (UINT uXPos, UINT uYPos, UINT uDirectionIndex, UINT uParentTankID) :
  24.     CMovingGameObject (uXPos, uYPos, BULLET_WIDTH, BULLET_HEIGHT, 
  25.                        uDirectionIndex, BULLET_SPEED),
  26.     m_Death (DEATH_NOTDEAD),
  27.     m_bExplodedOnTank (FALSE),
  28.     m_uParentTankID (uParentTankID),
  29.     m_uWaitToTellTank (0)
  30. {
  31.     m_himgBullet = m_GlobalImageManager.GetImage (CImageManager::IMG_BULLET);
  32.     m_Origin = m_Pos;
  33. }
  35. StateType 
  36. CBullet::CalcState (DWORD dwCurTime)
  37. {
  38.     m_bImageChanged = FALSE;    // Assume no change since last CalcState
  39.     if (m_Death != DEATH_NOTDEAD &&     // Bullet is dead and
  40.         m_Death != DEATH_HITTANK)       // not waiting to tell that to any tank
  41.     {
  42.         return STATE_DEAD;
  43.     }
  44.     if (DEATH_HITTANK == m_Death)
  45.     {   // We are dead because we hit a tank
  46.         if (m_bExplodedOnTank)
  47.         {   // and he knows it
  48.             return STATE_DEAD;
  49.         }
  50.         else
  51.         {   // He doesn't know it yet...
  52.             if (m_uWaitToTellTank++ < (DEFAULT_RENDER_FREQ / 2))
  53.             {   // If less than half a second passed and the tank
  54.                 // still doesn't know it was hit, wait on
  55.                 return STATE_ALIVE;
  56.             }
  57.             else
  58.             {   // Otherwise, we can't just hang in one spot.
  59.                 // Kill the bullet.
  60.                 return STATE_DEAD;
  61.             }
  62.         }
  63.     }
  64.     // We're still alive here....
  66.     // Try to advance...
  67.     int iDistSqr = CalcNewPos (dwCurTime);
  68.     if (iDistSqr < 0) 
  69.     {   // Out of map situation
  70.         m_Death = DEATH_OUTOFSCREEN;
  71.         return STATE_DEAD;
  72.     }
  74.     // Recalc iDistSqr to be distance from point of fire
  75.     int iXDist = m_Origin.x - m_Pos.x,
  76.         iYDist = m_Origin.y - m_Pos.y;
  77.     iDistSqr = iXDist * iXDist + iYDist * iYDist;
  79.     if (BULLET_DISTANCE_SQR <= iDistSqr)
  80.     {   // Distance expired situation
  81.         m_Death = DEATH_OUTOFRANGE;
  82.         return STATE_DEAD;
  83.     }
  85.     // See what the rest of the world thinks about our movement
  86.     CReaction react = m_GlobalObjsList.GetGameReaction (this);
  87.     TerrainType ter = react.GetTerrainDifficulty();
  89.     if ((ter < TERR_BLOCKED) ||  
  90.             // Cool - didn't hit a thing or ...
  91.         ((HIT_TANK == ter) && (react.GetTankID() == m_uParentTankID)))
  92.             // Hit a tank but it's our father
  93.     {
  94.         m_bImageChanged = TRUE; // We moved a bit
  95.         return STATE_ALIVE;
  96.     }
  97.     if (ter == TERR_BLOCKED)
  98.     {   // Hit a wall
  99.         m_Death = DEATH_HITWALL;
  100.         return STATE_DEAD;
  101.     }
  102.     // Now we're in the (ter == HIT_TANK) situation
  103.     m_Death = DEATH_HITTANK;
  104.     m_uHitTankID = react.GetTankID();   // Store the tank ID we hit
  105.     return STATE_ALIVE; // We can't die until the tank get notified we hit it.
  106. }
  107.         
  108. CReaction
  109. CBullet::React(CGameObject *pTo)
  110. {
  111.     if ((m_Death == DEATH_NOTDEAD) ||   // Either we're still flying
  112.         (pTo->GetType() != TANK)   ||   // or we're not reacting to tanks
  113.         m_bExplodedOnTank)              // or we already exploded
  114.         return CReaction(); // empty reaction
  116.     // Otherwise, we're in STATE_ALIVE and DEATH_HITTANK and this is a tank
  117.     ASSERT (DEATH_HITTANK == m_Death);
  118.     ASSERT (m_uHitTankID < MAX_TANKS);
  120.     if ((TANK == pTo->GetType()) &&     // We're being asked to react to a tank and
  121.         (pTo->GetID() == m_uHitTankID)) // this tank is the tank we hit
  122.     {   // Now, this is the tank we're hitting
  123.         m_bExplodedOnTank = TRUE;   // Finally !!!
  124.         return CReaction (BULLET_INTENSITY);
  125.     }
  127.     return CReaction ();    // This is not the tank we're hitting
  128. }