2 Copyright (C) 2011 Paul Davis
3 Author: Carl Hetherington <cth@carlh.net>
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 /** @file canvas/arrow.h
22 * @brief Declaration of the Arrow canvas object.
25 #ifndef __CANVAS_ARROW_H__
26 #define __CANVAS_ARROW_H__
28 #include "canvas/visibility.h"
30 #include "canvas/group.h"
32 namespace ArdourCanvas {
38 /** A composite item which draws a line with arrow heads
39 * at either or both ends.
41 * The arrow heads are identified by the indices 0 and 1;
42 * head 0 is at the (x0, y0) end of the line, and head 1
43 * at the (x1, y1) end.
45 * @todo Draws vertical lines only; could be generalised
46 * to draw lines at any angle.
49 class LIBCANVAS_API Arrow : public Group
55 void set_show_head (int, bool);
56 void set_head_outward (int, bool);
57 void set_head_height (int, Distance);
58 void set_head_width (int, Distance);
59 void set_outline_width (Distance);
60 void set_color (Color);
69 bool covers (Duple const &) const;
72 void setup_polygon (int);
75 /** Representation of a single arrow head */
77 Polygon* polygon; ///< the polygon which represents its shape
78 bool outward; ///< true if this head points out from the line
79 Distance height; ///< the height of the head
80 Distance width; ///< the maximum width of the head
83 /** our arrow heads; _heads[0] is at the (x0, y0) end of the line,
84 * and _heads[1] at the (x1, y1) end.