rom/graphics/ispointinregion.c

   1 /*
   2     Copyright © 1995-2001, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc: Graphics function AndRegionRegion()
   6     Lang: english
   7 */
   8 #include "graphics_intern.h"
   9 #include <graphics/regions.h>
  10 #include "intregions.h"
  11
  12 /*****************************************************************************
  13
  14     NAME */
  15 #include <proto/graphics.h>
  16
  17         AROS_LH3(BOOL, IsPointInRegion,
  18
  19 /*  SYNOPSIS */
  20         AROS_LHA(struct Region *, Reg, A0),
  21         AROS_LHA(WORD,            x,   D0),
  22         AROS_LHA(WORD,            y,   D1),
  23
  24 /*  LOCATION */
  25         struct GfxBase *, GfxBase, 190, Graphics)
  26
  27 /*  FUNCTION
  28         Checks if the point (x, y) is contained in the region Reg
  29
  30     INPUTS
  31         region1 - pointer to a region structure
  32         x       - The point's 'x' coordinate
  33         y       - The point's 'y' coordinate
  34
  35     RESULT
  36         TRUE if the point is contained, FALSE otherwise
  37
  38     NOTES
  39         This function isn't available in AmigaOS.
  40
  41     EXAMPLE
  42
  43     BUGS
  44
  45     SEE ALSO
  46         XorRegionRegion(), OrRegionRegion()
  47
  48     INTERNALS
  49
  50     HISTORY
  51
  52 *****************************************************************************/
  53 {
  54     AROS_LIBFUNC_INIT
  55
  56     struct RegionRectangle *rr;
  57
  58     if (!_IsPointInRect(Bounds(Reg), x, y))
  59         return FALSE;
  60
  61     x -= MinX(Reg);
  62     y -= MinY(Reg);
  63
  64     for
  65     (
  66         rr = Reg->RegionRectangle;
  67         rr;
  68         rr = rr->Next
  69     )
  70     {
  71         if (y > MaxY(rr)) continue;
  72         if (y < MinY(rr)) return FALSE;
  73         if (x < MinX(rr)) continue;
  74         if (x > MaxX(rr)) continue;
  75
  76         return TRUE;
  77     }
  78
  79     return FALSE;
  80
  81     AROS_LIBFUNC_EXIT
  82 }