2 Copyright (C) 2011-2013 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.
22 #include "canvas/poly_line.h"
23 #include "canvas/canvas.h"
24 #include "canvas/utils.h"
26 using namespace ArdourCanvas;
28 PolyLine::PolyLine (Group* parent)
37 PolyLine::render (Rect const & area, Cairo::RefPtr<Cairo::Context> context) const
40 setup_outline_context (context);
41 render_path (area, context);
47 PolyLine::covers (Duple const & point) const
49 Duple p = window_to_item (point);
51 const Points::size_type npoints = _points.size();
60 /* repeat for each line segment */
62 const Rect visible (window_to_item (_canvas->visible_area()));
64 for (i = 1, j = 0; i < npoints; ++i, ++j) {
72 Clamp the line endpoints to the visible area of the canvas. If we do
73 not do this, we may have a line segment extending to COORD_MAX and our
77 a.x = std::min (a.x, visible.x1);
78 a.y = std::min (a.y, visible.y1);
79 b.x = std::min (b.x, visible.x1);
80 b.y = std::min (b.y, visible.y1);
82 double d = distance_to_segment_squared (p, a, b, t, at);
84 if (t < 0.0 || t > 1.0) {
88 if (d < _threshold + _outline_width) {
98 PolyLine::set_covers_threshold (double t)