The POINTFLOAT structure contains the x and y coordinates of a point.
typedef struct _POINTFLOAT { // ptf   
    FLOAT      x; 
    FLOAT      y; 
} POINTFLOAT; 
 
  Windows NT:  Use version 4.0 and later.
  Windows:  Use Windows 95 OSR2 and later.
  Windows CE:  Unsupported.
  Header: Declared in wingdi.h.
OpenGL on Windows NT and Windows 95 Overview, Structures, GLYPHMETRICSFLOAT