Paul Davis
6473cc7cb4
Default implementation for Item still uses bounding box, but specializations for Arc (Circle), Polygon, Line and PolyLine have been added
113 lines
2.5 KiB
C++
113 lines
2.5 KiB
C++
/*
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Copyright (C) 2011-2013 Paul Davis
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Author: Carl Hetherington <cth@carlh.net>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "canvas/line_set.h"
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#include "canvas/utils.h"
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using namespace std;
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using namespace ArdourCanvas;
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/* XXX: hard-wired to horizontal only */
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class LineSorter {
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public:
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bool operator() (LineSet::Line& a, LineSet::Line& b) {
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return a.y < b.y;
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}
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};
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LineSet::LineSet (Group* parent)
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: Item (parent)
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, _height (0)
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{
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}
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void
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LineSet::compute_bounding_box () const
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{
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if (_lines.empty ()) {
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_bounding_box = boost::optional<Rect> ();
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} else {
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_bounding_box = Rect (0, _lines.front().y - (_lines.front().width/2.0), COORD_MAX, min (_height, _lines.back().y - (_lines.back().width/2.0)));
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}
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_bounding_box_dirty = false;
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}
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void
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LineSet::set_height (Distance height)
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{
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begin_change ();
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_height = height;
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_bounding_box_dirty = true;
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end_change ();
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}
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void
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LineSet::render (Rect const & area, Cairo::RefPtr<Cairo::Context> context) const
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{
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/* area is in window coordinates */
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for (list<Line>::const_iterator i = _lines.begin(); i != _lines.end(); ++i) {
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Rect self = item_to_window (Rect (0, i->y - (i->width/2.0), COORD_MAX, i->y + (i->width/2.0)));
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boost::optional<Rect> intersect = self.intersection (area);
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if (!intersect) {
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continue;
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}
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set_source_rgba (context, i->color);
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context->set_line_width (i->width);
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context->move_to (intersect->x0, self.y0 + ((self.y1 - self.y0)/2.0));
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context->line_to (intersect->x1, self.y0 + ((self.y1 - self.y0)/2.0));
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context->stroke ();
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}
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}
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void
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LineSet::add (Coord y, Distance width, Color color)
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{
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begin_change ();
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_lines.push_back (Line (y, width, color));
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_lines.sort (LineSorter ());
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_bounding_box_dirty = true;
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end_change ();
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}
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void
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LineSet::clear ()
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{
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begin_change ();
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_lines.clear ();
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_bounding_box_dirty = true;
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end_change ();
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}
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bool
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LineSet::covers (Duple const & /*point*/) const
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{
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return false;
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}
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