rom/graphics/ispointinregion.c

   1 /*
   2     Copyright © 1995-2011, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc:
   6     Lang: english
   7 */
   8
   9 #include "graphics_intern.h"
  10 #include <graphics/regions.h>
  11 #include "intregions.h"
  12
  13 /*****************************************************************************
  14
  15     NAME */
  16 #include <proto/graphics.h>
  17
  18         AROS_LH3(BOOL, IsPointInRegion,
  19
  20 /*  SYNOPSIS */
  21         AROS_LHA(struct Region *, Reg, A0),
  22         AROS_LHA(WORD,            x,   D0),
  23         AROS_LHA(WORD,            y,   D1),
  24
  25 /*  LOCATION */
  26         struct GfxBase *, GfxBase, 184, Graphics)
  27
  28 /*  FUNCTION
  29         Checks if the point (x, y) is contained in the region Reg
  30
  31     INPUTS
  32         region1 - pointer to a region structure
  33         x       - The point's 'x' coordinate
  34         y       - The point's 'y' coordinate
  35
  36     RESULT
  37         TRUE if the point is contained, FALSE otherwise
  38
  39     NOTES
  40         This function isn't available in AmigaOS.
  41
  42     EXAMPLE
  43
  44     BUGS
  45
  46     SEE ALSO
  47         XorRegionRegion(), OrRegionRegion()
  48
  49     INTERNALS
  50
  51     HISTORY
  52
  53 *****************************************************************************/
  54 {
  55     AROS_LIBFUNC_INIT
  56
  57     struct RegionRectangle *rr;
  58
  59     if (!_IsPointInRect(Bounds(Reg), x, y))
  60         return FALSE;
  61
  62     x -= MinX(Reg);
  63     y -= MinY(Reg);
  64
  65     for
  66     (
  67         rr = Reg->RegionRectangle;
  68         rr;
  69         rr = rr->Next
  70     )
  71     {
  72         if (y > MaxY(rr)) continue;
  73         if (y < MinY(rr)) return FALSE;
  74         if (x < MinX(rr)) continue;
  75         if (x > MaxX(rr)) continue;
  76
  77         return TRUE;
  78     }
  79
  80     return FALSE;
  81
  82     AROS_LIBFUNC_EXIT
  83 }