rom/graphics/areadraw.c

   1 /*
   2     Copyright © 1995-2001, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc: Graphics function AreaDraw()
   6     Lang: english
   7 */
   8 #include <exec/types.h>
   9 #include <graphics/rastport.h>
  10 #include "graphics_intern.h"
  11 #include "gfxfuncsupport.h"
  12
  13 /*****************************************************************************
  14
  15     NAME */
  16 #include <proto/graphics.h>
  17
  18         AROS_LH3(ULONG, AreaDraw,
  19
  20 /*  SYNOPSIS */
  21         AROS_LHA(struct RastPort *, rp, A1),
  22         AROS_LHA(WORD             , x , D0),
  23         AROS_LHA(WORD             , y , D1),
  24
  25 /*  LOCATION */
  26         struct GfxBase *, GfxBase, 43, Graphics)
  27
  28 /*  FUNCTION
  29         Add a point to the vector buffer.
  30
  31     INPUTS
  32         rp - pointer to a valid RastPort structure with a pointer to
  33              the previously initialized AreaInfo structure.
  34         x  - x-coordinate of the point in the raster
  35         y  - y-coordinate of the point in the raster
  36
  37     RESULT
  38         error -  0 for success
  39                 -1 if the vector collection matrix is full
  40
  41     NOTES
  42
  43     EXAMPLE
  44
  45     BUGS
  46
  47     SEE ALSO
  48         InitArea() AreaMove() AreaEllipse() AreaCircle() graphics/rastport.h
  49
  50     INTERNALS
  51
  52     HISTORY
  53
  54 *****************************************************************************/
  55 {
  56     AROS_LIBFUNC_INIT
  57     AROS_LIBBASE_EXT_DECL(struct GfxBase *,GfxBase)
  58
  59     struct AreaInfo * areainfo = rp->AreaInfo;
  60
  61     /* Is there still enough storage area in the areainfo-buffer?
  62      * We only need on vector to store here.
  63      */
  64
  65     if (areainfo->Count + 1 <= areainfo->MaxCount)
  66     {
  67         FIX_GFXCOORD(x);
  68         FIX_GFXCOORD(y);
  69
  70         /* increment counter */
  71
  72         areainfo->Count++;
  73         areainfo->VctrPtr[0] = x;
  74         areainfo->VctrPtr[1] = y;
  75         areainfo->FlagPtr[0] = AREAINFOFLAG_DRAW;
  76
  77         areainfo->VctrPtr    = &areainfo->VctrPtr[2];
  78         areainfo->FlagPtr++;
  79
  80         return 0;
  81     }
  82
  83     return -1;
  84
  85     AROS_LIBFUNC_EXIT
  86
  87 } /* AreaDraw */