gdkrectangle.c 3.72 KB
Newer Older
Elliot Lee's avatar
Elliot Lee committed
1 2 3 4
/* GDK - The GIMP Drawing Kit
 * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
 *
 * This library is free software; you can redistribute it and/or
5
 * modify it under the terms of the GNU Lesser General Public
Elliot Lee's avatar
Elliot Lee committed
6 7 8 9 10 11
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12
 * Lesser General Public License for more details.
Elliot Lee's avatar
Elliot Lee committed
13
 *
14
 * You should have received a copy of the GNU Lesser General Public
15 16 17
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
Elliot Lee's avatar
Elliot Lee committed
18
 */
19 20

/*
21
 * Modified by the GTK+ Team and others 1997-2000.  See the AUTHORS
22 23 24 25 26
 * file for a list of people on the GTK+ Team.  See the ChangeLog
 * files for a list of changes.  These files are distributed with
 * GTK+ at ftp://ftp.gtk.org/pub/gtk/. 
 */

27
#include <config.h>
28
#include <gdk/gdk.h>
29
#include "gdkalias.h"
Elliot Lee's avatar
Elliot Lee committed
30

Matthias Clasen's avatar
Matthias Clasen committed
31 32 33 34 35 36 37 38 39
/**
 * gdk_rectangle_union:
 * @src1: a #GdkRectangle
 * @src2: a #GdkRectangle
 * @dest: return location for the union of @src1 and @src2
 *
 * Calculates the union of two rectangles.
 * The union of rectangles @src1 and @src2 is the smallest rectangle which
 * includes both @src1 and @src2 within it.
40
 * It is allowed for @dest to be the same as either @src1 or @src2.
Matthias Clasen's avatar
Matthias Clasen committed
41
 */
42 43 44 45 46
void
gdk_rectangle_union (GdkRectangle *src1,
		     GdkRectangle *src2,
		     GdkRectangle *dest)
{
47 48
  gint dest_x, dest_y;
  
49 50 51 52
  g_return_if_fail (src1 != NULL);
  g_return_if_fail (src2 != NULL);
  g_return_if_fail (dest != NULL);

53 54 55 56 57 58
  dest_x = MIN (src1->x, src2->x);
  dest_y = MIN (src1->y, src2->y);
  dest->width = MAX (src1->x + src1->width, src2->x + src2->width) - dest_x;
  dest->height = MAX (src1->y + src1->height, src2->y + src2->height) - dest_y;
  dest->x = dest_x;
  dest->y = dest_y;
59 60
}

Matthias Clasen's avatar
Matthias Clasen committed
61 62 63 64 65 66
/**
 * gdk_rectangle_intersect:
 * @src1: a #GdkRectangle
 * @src2: a #GdkRectangle
 * @dest: return location for the intersection of @src1 and @src2
 *
67 68 69 70
 * Calculates the intersection of two rectangles. It is allowed for
 * @dest to be the same as either @src1 or @src2. If the rectangles
 * doesn't intersect, @dest's width and height is set to 0 and its x
 * and y values are undefined.
Matthias Clasen's avatar
Matthias Clasen committed
71 72 73
 *
 * Returns: %TRUE if the rectangles intersect.
 */
Owen Taylor's avatar
Owen Taylor committed
74
gboolean
Elliot Lee's avatar
Elliot Lee committed
75 76 77 78
gdk_rectangle_intersect (GdkRectangle *src1,
			 GdkRectangle *src2,
			 GdkRectangle *dest)
{
79 80
  gint dest_x, dest_y;
  gint dest_w, dest_h;
Elliot Lee's avatar
Elliot Lee committed
81 82 83 84 85 86 87 88
  gint return_val;

  g_return_val_if_fail (src1 != NULL, FALSE);
  g_return_val_if_fail (src2 != NULL, FALSE);
  g_return_val_if_fail (dest != NULL, FALSE);

  return_val = FALSE;

89 90 91 92
  dest_x = MAX (src1->x, src2->x);
  dest_y = MAX (src1->y, src2->y);
  dest_w = MIN (src1->x + src1->width, src2->x + src2->width) - dest_x;
  dest_h = MIN (src1->y + src1->height, src2->y + src2->height) - dest_y;
Elliot Lee's avatar
Elliot Lee committed
93

94
  if (dest_w > 0 && dest_h > 0)
Elliot Lee's avatar
Elliot Lee committed
95
    {
96 97 98 99 100
      dest->x = dest_x;
      dest->y = dest_y;
      dest->width = dest_w;
      dest->height = dest_h;
      return_val = TRUE;
Elliot Lee's avatar
Elliot Lee committed
101
    }
102
  else
103 104 105 106 107
    {
      dest->width = 0;
      dest->height = 0;
    }

Elliot Lee's avatar
Elliot Lee committed
108 109
  return return_val;
}
Owen Taylor's avatar
Owen Taylor committed
110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125

static GdkRectangle *
gdk_rectangle_copy (const GdkRectangle *rectangle)
{
  GdkRectangle *result = g_new (GdkRectangle, 1);
  *result = *rectangle;

  return result;
}

GType
gdk_rectangle_get_type (void)
{
  static GType our_type = 0;
  
  if (our_type == 0)
126
    our_type = g_boxed_type_register_static (g_intern_static_string ("GdkRectangle"),
Owen Taylor's avatar
Owen Taylor committed
127
					     (GBoxedCopyFunc)gdk_rectangle_copy,
128
					     (GBoxedFreeFunc)g_free);
Owen Taylor's avatar
Owen Taylor committed
129 130 131
  return our_type;
}

132 133 134

#define __GDK_RECTANGLE_C__
#include "gdkaliasdef.c"