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

//----------------------------------------------------------------- 
// Background Object 
// C++ Source - Background.cpp 
//----------------------------------------------------------------- 
 
//----------------------------------------------------------------- 
// Include Files 
//----------------------------------------------------------------- 
#include "Background.h" 
 
//----------------------------------------------------------------- 
// Background Constructor(s)/Destructor 
//----------------------------------------------------------------- 
Background::Background(int iWidth, int iHeight, COLORREF crColor) 
{ 
  // Initialize the member variables 
  m_iWidth = iWidth; 
  m_iHeight = iHeight; 
  m_crColor = crColor; 
  m_pBitmap = NULL; 
} 
 
Background::Background(Bitmap* pBitmap) 
{ 
  // Initialize the member variables 
  m_crColor = 0; 
  m_pBitmap = pBitmap; 
  m_iWidth = pBitmap->GetWidth(); 
  m_iHeight = pBitmap->GetHeight(); 
} 
 
Background::~Background() 
{ 
} 
 
//----------------------------------------------------------------- 
// Background General Methods 
//----------------------------------------------------------------- 
void Background::Update() 
{ 
  // Do nothing since the basic background is not animated 
} 
 
void Background::Draw(HDC hDC) 
{ 
  // Draw the background 
  if (m_pBitmap != NULL) 
    m_pBitmap->Draw(hDC, 0, 0); 
  else 
  { 
    RECT    rect = { 0, 0, m_iWidth, m_iHeight }; 
    HBRUSH  hBrush = CreateSolidBrush(m_crColor); 
    FillRect(hDC, &rect, hBrush); 
    DeleteObject(hBrush); 
  } 
} 
 
//----------------------------------------------------------------- 
// StarryBackground Constructor 
//----------------------------------------------------------------- 
StarryBackground::StarryBackground(int iWidth, int iHeight, int iNumStars, 
  int iTwinkleDelay) : Background(iWidth, iHeight, 0) 
{ 
  // Initialize the member variables 
  m_iNumStars = min(iNumStars, 100); 
  m_iTwinkleDelay = iTwinkleDelay; 
 
  // Create the stars 
  for (int i = 0; i < iNumStars; i++) 
  { 
    m_ptStars[i].x = rand() % iWidth; 
    m_ptStars[i].y = rand() % iHeight; 
    m_crStarColors[i] = RGB(128, 128, 128); 
  } 
} 
 
StarryBackground::~StarryBackground() 
{ 
} 
 
//----------------------------------------------------------------- 
// StarryBackground General Methods 
//----------------------------------------------------------------- 
void StarryBackground::Update() 
{ 
  // Randomly change the shade of the stars so that they twinkle 
  int iRGB; 
  for (int i = 0; i < m_iNumStars; i++) 
    if ((rand() % m_iTwinkleDelay) == 0) 
    { 
      iRGB = rand() % 256; 
      m_crStarColors[i] = RGB(iRGB, iRGB, iRGB); 
    } 
} 
 
void StarryBackground::Draw(HDC hDC) 
{ 
  // Draw the solid black background 
  RECT    rect = { 0, 0, m_iWidth, m_iHeight }; 
  HBRUSH  hBrush = CreateSolidBrush(RGB(0, 0, 0)); 
  FillRect(hDC, &rect, hBrush); 
  DeleteObject(hBrush); 
 
  // Draw the stars 
  for (int i = 0; i < m_iNumStars; i++) 
    SetPixel(hDC, m_ptStars[i].x, m_ptStars[i].y, m_crStarColors[i]); 
}