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