Paul Davis
590882f3c8
Items no longer need a parent group (they require a Canvas pointer instead), so all constructors have been rationalized and have two variants, one with a parent and one with a canvas. All Items now inherit from Fill and Outline, to banish diagonal inheritance and virtual base classes and all that. There were zero changes to the Ardour GUI arising from these changes.
160 lines
3.5 KiB
C++
160 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 (Canvas* c)
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: Item (c)
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{
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}
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PolyItem::PolyItem (Group* g)
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: Item (g)
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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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