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 /* the goal here is that if the border is 1 pixel
92 * thick, it will precisely align with the corner
93 * coordinates of the rectangle. So if the rectangle
94 * has a left edge at 0 and a right edge at 10, then
95 * the left edge must span -0.5..+0.5, the right edge
96 * must span 9.5..10.5 (i.e. the single full color
97 * pixel is precisely aligned with 0 and 10
100 * we have to shift left/up in all cases, which means
101 * subtraction along both axes (i.e. edge at
102 * N, outline must start at N-0.5).
104 * see the cairo FAQ on single pixel lines to see why we do
105 * the 0.5 pixel additions.
108 self = self.translate (Duple (-0.5, -0.5));
110 std::cerr << "Outline using " << self << " from " << _rect << std::endl;
112 if (_outline_what == What (LEFT|RIGHT|BOTTOM|TOP)) {
114 context->rectangle (self.x0, self.y0, self.width(), self.height());
118 if (_outline_what & LEFT) {
119 context->move_to (self.x0, self.y0);
120 context->line_to (self.x0, self.y1);
123 if (_outline_what & TOP) {
124 context->move_to (self.x0, self.y0);
125 context->line_to (self.x1, self.y0);
128 if (_outline_what & BOTTOM) {
129 context->move_to (self.x0, self.y1);
130 context->line_to (self.x1, self.y1);
133 if (_outline_what & RIGHT) {
134 context->move_to (self.x1, self.y0);
135 context->line_to (self.x1, self.y1);
144 Rectangle::compute_bounding_box () const
146 if (!_rect.empty()) {
147 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
158 _bounding_box_dirty = false;
162 Rectangle::set (Rect const & r)
164 /* We don't update the bounding box here; it's just
165 as cheap to do it when asked.
174 _bounding_box_dirty = true;
180 Rectangle::set_x0 (Coord x0)
182 if (x0 != _rect.x0) {
187 _bounding_box_dirty = true;
193 Rectangle::set_y0 (Coord y0)
195 if (y0 != _rect.y0) {
200 _bounding_box_dirty = true;
206 Rectangle::set_x1 (Coord x1)
208 if (x1 != _rect.x1) {
213 _bounding_box_dirty = true;
219 Rectangle::set_y1 (Coord y1)
221 if (y1 != _rect.y1) {
226 _bounding_box_dirty = true;
232 Rectangle::set_outline_what (What what)
234 if (what != _outline_what) {
235 begin_visual_change ();
236 _outline_what = what;
237 end_visual_change ();