VOID CALLBACK LineDDAProc(
int X, // x-coordinate of point
int Y, // y-coordinate of point
LPARAM lpData // application-defined data
);
BOOL LineDDA(
int nXStart, // x-coordinate of starting point
int nYStart, // y-coordinate of starting point
int nXEnd, // x-coordinate of ending point
int nYEnd, // y-coordinate of ending point
LINEDDAPROC lpLineFunc, // callback function
LPARAM lpData // application-defined data
);