www.pudn.com > StuntJumper.rar > MotorcycleSprite.cpp

//----------------------------------------------------------------- 
// Motorcycle Sprite Object 
// C++ Source - MotorcycleSprite.cpp 
//----------------------------------------------------------------- 
 
//----------------------------------------------------------------- 
// Include Files 
//----------------------------------------------------------------- 
#include "MotorcycleSprite.h" 
 
//----------------------------------------------------------------- 
// External Global Variables 
//----------------------------------------------------------------- 
extern HINSTANCE  g_hInstance; 
extern int        g_bGameOver; 
 
//----------------------------------------------------------------- 
// MotorcycleSprite Constructor(s)/Destructor 
//----------------------------------------------------------------- 
MotorcycleSprite::MotorcycleSprite(Bitmap* pBitmap, RECT& rcBounds, 
  BOUNDSACTION baBoundsAction) : Sprite(pBitmap, rcBounds, 
  baBoundsAction), m_iMINSPEED(1), m_iMAXSPEED(10), m_iHANGTIME(6) 
{ 
  // Initialize the motorcycle sprite variables 
  m_iCurFrame = 6;  // the frame where the motorcycle is level 
  m_bJumping = FALSE; 
  m_iJumpCounter = 0; 
  m_bLandedSafely = TRUE; 
} 
 
MotorcycleSprite::~MotorcycleSprite() 
{ 
} 
 
//----------------------------------------------------------------- 
// MotorcycleSprite Virtual Methods 
//----------------------------------------------------------------- 
void MotorcycleSprite::UpdateFrame() 
{ 
  if (m_bJumping) 
  { 
    // Start jumping 
    if (m_iJumpCounter-- >= 0) 
    { 
      // See if the motorcycle is on the way up 
      if (m_iJumpCounter > (m_ptVelocity.x * m_iHANGTIME / 2)) 
      { 
        // Change the frame to show the motorcycle tilt upward 
        m_iCurFrame = min(m_iCurFrame + 1, 12); 
 
        // Change the vertical velocity to cause the motorcycle to ascend 
        if (m_iJumpCounter % (m_iHANGTIME / 2) == 0) 
          m_ptVelocity.y++; 
      } 
      // See if the motorcycle is on the way down 
      else if (m_iJumpCounter <= (m_ptVelocity.x * m_iHANGTIME / 2)) 
      { 
        // Change the frame to show the motorcycle tilt downward 
        m_iCurFrame = max(m_iCurFrame - 1, 0); 
 
        // Change the vertical velocity to cause the motorcycle to descend 
        if (m_iJumpCounter % (m_iHANGTIME / 2) == 0) 
          m_ptVelocity.y++; 
      } 
    } 
    else 
    { 
      // Stop the jump and level the motorcycle 
      m_bJumping = FALSE; 
      m_iCurFrame = 6; 
      m_ptVelocity.y = 0; 
 
      // See if the motorcycle overshot the landing ramp 
      if (!m_bLandedSafely) 
      { 
        // Play the crash sound 
        PlaySound((LPCSTR)IDW_CRASH, g_hInstance, SND_ASYNC | 
          SND_RESOURCE); 
 
        // End the game 
        m_ptVelocity.x = 0; 
        g_bGameOver = TRUE; 
      } 
    } 
  } 
} 
 
//----------------------------------------------------------------- 
// MotorcycleSprite General Methods 
//----------------------------------------------------------------- 
void MotorcycleSprite::IncreaseSpeed() 
{ 
  if (!m_bJumping) 
    // Increase the horizontal speed of the motorcycle 
    m_ptVelocity.x = min(m_ptVelocity.x + 1, m_iMAXSPEED); 
} 
 
void MotorcycleSprite::DecreaseSpeed() 
{ 
  if (!m_bJumping) 
    // Decrease the horizontal speed of the motorcycle 
    m_ptVelocity.x = max(m_ptVelocity.x - 1, m_iMINSPEED); 
} 
 
void MotorcycleSprite::StartJumping() 
{ 
  if (!m_bJumping) 
  { 
    // Start the motorcycle jumping 
    m_iJumpCounter = m_ptVelocity.x * m_iHANGTIME; 
    m_ptVelocity.y = -m_ptVelocity.x; 
    m_bJumping = TRUE; 
    m_bLandedSafely = FALSE; 
  } 
} 
 
void MotorcycleSprite::LandedSafely() 
{ 
  // Flag the motorcycle as having landed safely (hit the landing ramp) 
  m_bLandedSafely = TRUE; 
}