1 /* GDK - The GIMP Drawing Kit
2 * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
3 *
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
8 *
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with this library; if not, write to the
16 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 * Boston, MA 02111-1307, USA.
18 */
19
20 /*
21 * Modified by the GTK+ Team and others 1997-2000. See the AUTHORS
22 * file for a list of people on the GTK+ Team. See the ChangeLog
23 * files for a list of changes. These files are distributed with
24 * GTK+ at ftp://ftp.gtk.org/pub/gtk/.
25 */
26
27 #include "config.h"
28 #include <gdk/gdk.h>
29 #include "gdkalias.h"
30
31 /**
32 * gdk_rectangle_union:
33 * @src1: a #GdkRectangle
34 * @src2: a #GdkRectangle
35 * @dest: (out): return location for the union of @src1 and @src2
36 *
37 * Calculates the union of two rectangles.
38 * The union of rectangles @src1 and @src2 is the smallest rectangle which
39 * includes both @src1 and @src2 within it.
40 * It is allowed for @dest to be the same as either @src1 or @src2.
41 */
42 void
gdk_rectangle_union(const GdkRectangle * src1,const GdkRectangle * src2,GdkRectangle * dest)43 gdk_rectangle_union (const GdkRectangle *src1,
44 const GdkRectangle *src2,
45 GdkRectangle *dest)
46 {
47 gint dest_x, dest_y;
48
49 g_return_if_fail (src1 != NULL);
50 g_return_if_fail (src2 != NULL);
51 g_return_if_fail (dest != NULL);
52
53 dest_x = MIN (src1->x, src2->x);
54 dest_y = MIN (src1->y, src2->y);
55 dest->width = MAX (src1->x + src1->width, src2->x + src2->width) - dest_x;
56 dest->height = MAX (src1->y + src1->height, src2->y + src2->height) - dest_y;
57 dest->x = dest_x;
58 dest->y = dest_y;
59 }
60
61 /**
62 * gdk_rectangle_intersect:
63 * @src1: a #GdkRectangle
64 * @src2: a #GdkRectangle
65 * @dest: (out caller-allocates) (allow-none): return location for the
66 * intersection of @src1 and @src2, or %NULL
67 *
68 * Calculates the intersection of two rectangles. It is allowed for
69 * @dest to be the same as either @src1 or @src2. If the rectangles
70 * do not intersect, @dest's width and height is set to 0 and its x
71 * and y values are undefined. If you are only interested in whether
72 * the rectangles intersect, but not in the intersecting area itself,
73 * pass %NULL for @dest.
74 *
75 * Returns: %TRUE if the rectangles intersect.
76 */
77 gboolean
gdk_rectangle_intersect(const GdkRectangle * src1,const GdkRectangle * src2,GdkRectangle * dest)78 gdk_rectangle_intersect (const GdkRectangle *src1,
79 const GdkRectangle *src2,
80 GdkRectangle *dest)
81 {
82 gint dest_x, dest_y;
83 gint dest_x2, dest_y2;
84 gint return_val;
85
86 g_return_val_if_fail (src1 != NULL, FALSE);
87 g_return_val_if_fail (src2 != NULL, FALSE);
88
89 return_val = FALSE;
90
91 dest_x = MAX (src1->x, src2->x);
92 dest_y = MAX (src1->y, src2->y);
93 dest_x2 = MIN (src1->x + src1->width, src2->x + src2->width);
94 dest_y2 = MIN (src1->y + src1->height, src2->y + src2->height);
95
96 if (dest_x2 > dest_x && dest_y2 > dest_y)
97 {
98 if (dest)
99 {
100 dest->x = dest_x;
101 dest->y = dest_y;
102 dest->width = dest_x2 - dest_x;
103 dest->height = dest_y2 - dest_y;
104 }
105 return_val = TRUE;
106 }
107 else if (dest)
108 {
109 dest->width = 0;
110 dest->height = 0;
111 }
112
113 return return_val;
114 }
115
116 static GdkRectangle *
gdk_rectangle_copy(const GdkRectangle * rectangle)117 gdk_rectangle_copy (const GdkRectangle *rectangle)
118 {
119 GdkRectangle *result = g_new (GdkRectangle, 1);
120 *result = *rectangle;
121
122 return result;
123 }
124
125 GType
gdk_rectangle_get_type(void)126 gdk_rectangle_get_type (void)
127 {
128 static GType our_type = 0;
129
130 if (our_type == 0)
131 our_type = g_boxed_type_register_static (g_intern_static_string ("GdkRectangle"),
132 (GBoxedCopyFunc)gdk_rectangle_copy,
133 (GBoxedFreeFunc)g_free);
134 return our_type;
135 }
136
137
138 #define __GDK_RECTANGLE_C__
139 #include "gdkaliasdef.c"
140