1 /* GDK - The GIMP Drawing Kit
2 * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
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.
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.
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.
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/.
32 * gdk_rectangle_union:
33 * @src1: a #GdkRectangle
34 * @src2: a #GdkRectangle
35 * @dest: return location for the union of @src1 and @src2
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.
43 gdk_rectangle_union (const GdkRectangle *src1,
44 const GdkRectangle *src2,
49 g_return_if_fail (src1 != NULL);
50 g_return_if_fail (src2 != NULL);
51 g_return_if_fail (dest != NULL);
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;
62 * gdk_rectangle_intersect:
63 * @src1: a #GdkRectangle
64 * @src2: a #GdkRectangle
65 * @dest: (allow-none): return location for the intersection of @src1 and @src2, or %NULL
67 * Calculates the intersection of two rectangles. It is allowed for
68 * @dest to be the same as either @src1 or @src2. If the rectangles
69 * do not intersect, @dest's width and height is set to 0 and its x
70 * and y values are undefined. If you are only interested in whether
71 * the rectangles intersect, but not in the intersecting area itself,
72 * pass %NULL for @dest.
74 * Returns: %TRUE if the rectangles intersect.
77 gdk_rectangle_intersect (const GdkRectangle *src1,
78 const GdkRectangle *src2,
82 gint dest_x2, dest_y2;
85 g_return_val_if_fail (src1 != NULL, FALSE);
86 g_return_val_if_fail (src2 != NULL, FALSE);
90 dest_x = MAX (src1->x, src2->x);
91 dest_y = MAX (src1->y, src2->y);
92 dest_x2 = MIN (src1->x + src1->width, src2->x + src2->width);
93 dest_y2 = MIN (src1->y + src1->height, src2->y + src2->height);
95 if (dest_x2 > dest_x && dest_y2 > dest_y)
101 dest->width = dest_x2 - dest_x;
102 dest->height = dest_y2 - dest_y;
115 static GdkRectangle *
116 gdk_rectangle_copy (const GdkRectangle *rectangle)
118 GdkRectangle *result = g_new (GdkRectangle, 1);
119 *result = *rectangle;
125 gdk_rectangle_get_type (void)
127 static GType our_type = 0;
130 our_type = g_boxed_type_register_static (g_intern_static_string ("GdkRectangle"),
131 (GBoxedCopyFunc)gdk_rectangle_copy,
132 (GBoxedFreeFunc)g_free);