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.
21 #include <cairomm/context.h>
22 #include "pbd/stacktrace.h"
23 #include "pbd/compose.h"
25 #include "canvas/canvas.h"
26 #include "canvas/rectangle.h"
27 #include "canvas/debug.h"
28 #include "canvas/utils.h"
31 using namespace ArdourCanvas;
33 Rectangle::Rectangle (Canvas* c)
35 , _outline_what ((What) (LEFT | RIGHT | TOP | BOTTOM))
39 Rectangle::Rectangle (Canvas* c, Rect const & rect)
42 , _outline_what ((What) (LEFT | RIGHT | TOP | BOTTOM))
46 Rectangle::Rectangle (Item* parent)
48 , _outline_what ((What) (LEFT | RIGHT | TOP | BOTTOM))
52 Rectangle::Rectangle (Item* parent, Rect const & rect)
55 , _outline_what ((What) (LEFT | RIGHT | TOP | BOTTOM))
60 Rectangle::render (Rect const & area, Cairo::RefPtr<Cairo::Context> context) const
62 /* In general, a Rectangle will have a _position of (0,0) within its
63 parent, and its extent is actually defined by _rect. But in the
64 unusual case that _position is set to something other than (0,0),
65 we should take that into account when rendering.
67 Rect self = item_to_window (_rect.translate (_position));
68 boost::optional<Rect> r = self.intersection (area);
76 if (_fill && !_transparent) {
78 setup_fill_context (context);
80 setup_gradient_context (context, self, Duple (draw.x0, draw.y0));
83 context->rectangle (draw.x0, draw.y0, draw.width(), draw.height());
89 setup_outline_context (context);
91 if (_outline_what == What (LEFT|RIGHT|BOTTOM|TOP)) {
93 context->rectangle (self.x0 + 0.5, self.y0 + 0.5, self.width() - 1.0, self.height() - 1.0);
97 /* the goal here is that if the border is 1 pixel
98 * thick, it will precisely align with the corner
99 * coordinates of the rectangle. So if the rectangle
100 * has a left edge at 0 and a right edge at 10, then
101 * the left edge must span -0.5..+0.5, the right edge
102 * must span 9.5..10.5 (i.e. the single full color
103 * pixel is precisely aligned with 0 and 10
106 * we have to shift left/up in all cases, which means
107 * subtraction along both axes (i.e. edge at
108 * N, outline must start at N-0.5).
110 * see the cairo FAQ on single pixel lines to see why we do
111 * the 0.5 pixel additions.
114 if (_outline_what & LEFT) {
115 /* vertical line: move x-coordinate left by 0.5 pixels */
116 context->move_to (self.x0 - 0.5, self.y0);
117 context->line_to (self.x0 - 0.5, self.y1);
120 if (_outline_what & TOP) {
121 /* horizontal line: move y-coordinate up by 0.5 pixels */
122 context->move_to (self.x0, self.y0 - 0.5);
123 context->line_to (self.x1, self.y0 - 0.5);
126 if (_outline_what & BOTTOM) {
127 /* horizontal line: move y-coordinate up by 0.5 pixels */
128 context->move_to (self.x0, self.y1 - 0.5);
129 context->line_to (self.x1, self.y1 - 0.5);
132 if (_outline_what & RIGHT) {
133 /* vertical line: move x-coordinate left by 0.5 pixels */
134 context->move_to (self.x1 - 0.5, self.y0);
135 context->line_to (self.x1 - 0.5, self.y1);
145 Rectangle::compute_bounding_box () const
147 if (!_rect.empty()) {
148 Rect r = _rect.fix ();
149 /* take into acount the 0.5 addition to the bounding
150 box for the right and bottom edges, see ::render() above
153 r.x1 += 1.0; // XXX this makes no sense but is necessary
159 _bounding_box_dirty = false;
163 Rectangle::set (Rect const & r)
165 /* We don't update the bounding box here; it's just
166 as cheap to do it when asked.
175 _bounding_box_dirty = true;
181 Rectangle::set_x0 (Coord x0)
183 if (x0 != _rect.x0) {
188 _bounding_box_dirty = true;
194 Rectangle::set_y0 (Coord y0)
196 if (y0 != _rect.y0) {
201 _bounding_box_dirty = true;
207 Rectangle::set_x1 (Coord x1)
209 if (x1 != _rect.x1) {
214 _bounding_box_dirty = true;
220 Rectangle::set_y1 (Coord y1)
222 if (y1 != _rect.y1) {
227 _bounding_box_dirty = true;
233 Rectangle::set_outline_what (What what)
235 if (what != _outline_what) {
236 begin_visual_change ();
237 _outline_what = what;
238 end_visual_change ();