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