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livetrax/libs/canvas/poly_item.cc

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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 <algorithm>
#include "pbd/compose.h"
#include "canvas/poly_item.h"
#include "canvas/canvas.h"
using namespace std;
using namespace ArdourCanvas;
PolyItem::PolyItem (Canvas* c)
: Item (c)
{
}
PolyItem::PolyItem (Item* parent)
: Item (parent)
{
}
void
PolyItem::compute_bounding_box () const
{
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if (!_points.empty()) {
Rect bbox;
Points::const_iterator i = _points.begin();
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bbox.x0 = bbox.x1 = i->x;
bbox.y0 = bbox.y1 = i->y;
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++i;
while (i != _points.end()) {
bbox.x0 = min (bbox.x0, i->x);
bbox.y0 = min (bbox.y0, i->y);
bbox.x1 = max (bbox.x1, i->x);
bbox.y1 = max (bbox.y1, i->y);
++i;
}
_bounding_box = bbox.expand (_outline_width + 0.5);
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} else {
_bounding_box = boost::optional<Rect> ();
}
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_bounding_box_dirty = false;
}
void
PolyItem::render_path (Rect const & /* area */, Cairo::RefPtr<Cairo::Context> context) const
{
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if (_points.size() < 2) {
return;
}
Points::const_iterator i = _points.begin();
Duple c (item_to_window (Duple (i->x, i->y)));
const double pixel_adjust = (_outline_width == 1.0 ? 0.5 : 0.0);
context->move_to (c.x + pixel_adjust, c.y + pixel_adjust);
++i;
while (i != _points.end()) {
c = item_to_window (Duple (i->x, i->y));
context->line_to (c.x + pixel_adjust, c.y + pixel_adjust);
++i;
}
}
void
PolyItem::render_curve (Rect const & area, Cairo::RefPtr<Cairo::Context> context, Points const & first_control_points, Points const & second_control_points) const
{
if (_points.size() <= 2) {
render_path (area, context);
return;
}
Points::const_iterator cp1 = first_control_points.begin();
Points::const_iterator cp2 = second_control_points.begin();
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Points::const_iterator p = _points.begin();
const double pixel_adjust = (_outline_width == 1.0 ? 0.5 : 0.0);
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Duple c = item_to_window (Duple (p->x, p->y));
context->move_to (c.x + pixel_adjust, c.y + pixel_adjust);
++p;
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while (p != _points.end()) {
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Duple c1 = item_to_window (Duple (cp1->x, cp1->y));
Duple c2 = item_to_window (Duple (cp2->x, cp2->y));
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c = item_to_window (Duple (p->x, p->y));
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context->curve_to (c1.x + pixel_adjust,
c1.y + pixel_adjust,
c2.x + pixel_adjust,
c2.y + pixel_adjust,
c.x + pixel_adjust,
c.y + pixel_adjust);
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++cp1;
++cp2;
++p;
}
}
void
PolyItem::set (Points const & points)
{
if (_points != points) {
begin_change ();
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_points = points;
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_bounding_box_dirty = true;
end_change ();
}
}
Points const &
PolyItem::get () const
{
return _points;
}
void
PolyItem::dump (ostream& o) const
{
Item::dump (o);
o << _canvas->indent() << '\t' << _points.size() << " points" << endl;
for (Points::const_iterator i = _points.begin(); i != _points.end(); ++i) {
o << _canvas->indent() << "\t\t" << i->x << ", " << i->y << endl;
}
}