rom/graphics/newrectregion.c

   1 /*
   2     Copyright © 1995-2001, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc: (AROS only) Graphics function NewRectRegion()
   6     Lang: english
   7 */
   8 #include "graphics_intern.h"
   9 #include <graphics/regions.h>
  10 #include <clib/macros.h>
  11 #include "intregions.h"
  12
  13 /*****************************************************************************
  14
  15     NAME */
  16 #include <proto/graphics.h>
  17
  18         AROS_LH4(struct Region *, NewRectRegion,
  19
  20 /*  SYNOPSIS */
  21         AROS_LHA(WORD, MinX, D0),
  22         AROS_LHA(WORD, MinY, D1),
  23         AROS_LHA(WORD, MaxX, D2),
  24         AROS_LHA(WORD, MaxY, D3),
  25
  26 /*  LOCATION */
  27         struct GfxBase *, GfxBase, 194, Graphics)
  28
  29 /*  FUNCTION
  30         Creates a new rectangular Region
  31
  32     INPUTS
  33         MinX, MinY, MaxX, MaxY - The extent of the Rect
  34
  35     RESULT
  36         Pointer to the newly created Region. NULL on failure.
  37
  38     NOTES
  39         This function does not exist in AmigaOS.
  40         It does basically the same as:
  41
  42             struct Rectangle rect;
  43             struct Region *region;
  44
  45             rect.MinX = MinX;
  46             rect.MinY = MinY;
  47             rect.MaxX = MaxX;
  48             rect.MaxY = MaxY;
  49
  50             region = NewRegion();
  51             OrRectRegion(region, &rect);
  52
  53     EXAMPLE
  54
  55     BUGS
  56
  57     SEE ALSO
  58         NewRegion(), OrRectRegion()
  59
  60     INTERNALS
  61
  62     HISTORY
  63         15-12-2000  stegerg implemented
  64
  65 *****************************************************************************/
  66 {
  67     AROS_LIBFUNC_INIT
  68
  69     struct Region           *region;
  70     struct RegionRectangle  *rr;
  71
  72     if ((region = NewRegion()))
  73     {
  74         struct RegionRectangle *last = NULL;
  75
  76         if (ARE_COORDS_EVIL(MinX, MinY, MaxX, MaxY))
  77         {
  78             /* Just create an empty region */
  79         }
  80         else if ((rr = _NewRegionRectangle(&last, GfxBase)))
  81         {
  82             region->bounds.MinX = MinX;
  83             region->bounds.MinY = MinY;
  84             region->bounds.MaxX = MaxX;
  85             region->bounds.MaxY = MaxY;
  86
  87             rr->bounds.MinX = 0;
  88             rr->bounds.MinY = 0;
  89             rr->bounds.MaxX = MaxX - MinX;
  90             rr->bounds.MaxY = MaxY - MinY;
  91
  92             region->RegionRectangle = rr;
  93         }
  94         else
  95         {
  96             DisposeRegion(region);
  97             region = NULL;
  98         }
  99     }
 100
 101     return region;
 102
 103     AROS_LIBFUNC_EXIT
 104
 105 } /* NewRectRegion */