◄Function Group►  ◄Overview►                          ◄Up► ◄Next► ◄Previous►
────────────────────────────────────────────────────────────────────────────
 
#define INCL_GPIPRIMITIVES
 
BOOL GpiBeginArea(hps, flOptions)
HPS hps;            /* presentation-space handle */
ULONG flOptions;    /* area-option flag          */
 
The GpiBeginArea function starts an area bracket, that is, it starts a
sequence of functions that define the shape of an area. All subsequent
drawing functions, up to the next GpiEndArea function, apply to the new
area. The flOptions parameter specifies whether the figures in the area have
boundary lines and which filling mode to use for constructing the interior
of the area.
 
Parameter  Description
────────────────────────────────────────────────────────────────────────────
 
hps        Identifies the presentation space.
 
flOptions  Specifies the area options. It can be any combination of the
           following values:
 
           Value          Meaning
           ─────────────────────────────────────────────────────────────────
           BA_ALTERNATE   Constructs the interior in alternate mode
                          (default).
 
           BA_BOUNDARY    Boundary lines are drawn.
 
           BA_NOBOUNDARY  Boundary lines are not drawn (default).
 
           BA_WINDING     Constructs the interior in winding mode.
 
Return Value
 
The return value is GPI_OK or GPI_ERROR if an error occurred.
 
Errors
 
Use the WinGetLastError function to retrieve the error value, which may be
one of the following:
 
     PMERR_ALREADY_IN_AREA
     PMERR_INV_AREA_CONTROL
     PMERR_INV_HPS
     PMERR_INV_IN_PATH
     PMERR_PS_BUSY
 
Example
 
This example uses the GpiBeginArea function to draw an area. The area, an
isosceles triangle, is drawn with boundary lines and filled using the
alternate filling mode.
 
HPS hps;
POINTL ptlStart = { 0, 0 };
POINTL ptlTriangle[] = { 100, 100, 200, 0, 0, 0 };
GpiMove(hps, &ptlStart);    /* move to starting point (0, 0)     */
GpiBeginArea(hps,           /* start the area bracket            */
    BA_BOUNDARY |           /* draw boundary lines               */
    BA_ALTERNATE);          /* fill interior with alternate mode */
GpiPolyLine(hps, 3L, ptlTriangle);       /* draw the triangle    */
GpiEndArea(hps);                         /* end the area bracket */
                                         /* and fill the area    */
 
See Also
 
GpiEndArea, WinGetLastError
 
                                      ♦