LocalWeather class

  public:
 LocalWeather( void ) { cellArray = NULL; };
 ~LocalWeather( void ) { if (cellArray) Cleanup(); };

 void Setup( float visRange, ObjectDisplayList* objList );
 void Cleanup( void );
 void Update( Tpoint *position, DWORD currentTime );

 float GetAreaFloor( void )  { return cloudBase; };
 float GetAreaCeiling( void ) { return cloudTops; };

 float LineOfSight( Tpoint *p1, Tpoint *p2 );

 float GetMaxRange( void )  { return range; };

  protected:
 void UpdateForDrift( void );
 void SlideLocalCellsVertical( int vx );
 void SlideLocalCellsHorizontal( int vy );
 void RebuildList( void );
 void ComputeAreaFloorAndCeiling( void );

 BOOL horizontalEdgeTest( int row, int col, float x, float y, float z, BOOL downward );
 BOOL verticalEdgeTest( int row, int col, float x, float y, float z, BOOL downward );
 float LineSquareIntersection( int row, int col, float x1, float y1, float z1, float dx, float dy, float dz, BOOL downward );
 WeatherCell *GetLocalCell( int r, int c ) { if (abs(r)>cellRange)  return NULL;
             if (abs(c)>cellRange)  return NULL;
             return cellArray + (r+cellRange)*rowLen + c+cellRange; };
 
  protected:
 ObjectDisplayList* objMgr; // Object list which will sort and draw cloud objects
 
 float centerX, centerY; // What is our current center point (world space)
 int  cellRow, cellCol; // What is our current center point (cell coordinates)

 int  rowShiftHistory; // Checked against TheWeather to detect map shifts
 int  colShiftHistory; // Checked against TheWeather to detect map shifts

 float range;    // How far away can clouds be seen
 int  cellRange;   // How many weather cells into the distance do we need
 int  rowLen;    // How many cells accross (and high) is the cell array

 float cloudBase;   // Z value at base of local clouds (-Z is up)
 float cloudTops;   // Z value at tops of local clouds (-Z is up)

 WeatherCell *cellArray;  // ROWxCOL array of local cells