157 lines
3.2 KiB
C++
157 lines
3.2 KiB
C++
/*
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* Copyright (C) 2012 Carl Hetherington <carl@carlh.net>
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* Copyright (C) 2013-2014 Paul Davis <paul@linuxaudiosystems.com>
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*
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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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*
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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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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <algorithm>
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#include <cairomm/context.h>
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#include "pbd/compose.h"
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#include "canvas/lollipop.h"
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#include "canvas/types.h"
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#include "canvas/debug.h"
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#include "canvas/utils.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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Lollipop::Lollipop (Canvas* c)
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: Item (c)
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, _radius (8)
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, _length (0)
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{
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}
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Lollipop::Lollipop (Item* parent)
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: Item (parent)
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, _radius (8)
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, _length (0)
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{
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}
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void
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Lollipop::compute_bounding_box () const
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{
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_bounding_box = Rect (-_radius, -_radius, _radius, _length + _radius).expand (0.5 + (_outline_width / 2));
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set_bbox_clean ();
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}
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void
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Lollipop::render (Rect const & area, Cairo::RefPtr<Cairo::Context> context) const
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{
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setup_outline_context (context);
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Duple p = _parent->item_to_window (Duple (_position.x, _position.y));
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if (_outline_width <= 1.0) {
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/* See Cairo FAQ on single pixel lines to understand why we add 0.5
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*/
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const Duple half_a_pixel (0.5, 0.5);
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p = p.translate (half_a_pixel);
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}
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/* the line */
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context->move_to (p.x, p.y + _radius);
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context->line_to (p.x, p.y + _length - _radius);
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context->stroke ();
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/* the circle */
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context->arc (p.x, p.y, _radius, 0.0 * (M_PI/180.0), 360.0 * (M_PI/180.0));
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if (fill()) {
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setup_fill_context (context);
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if (outline()) {
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context->fill_preserve ();
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} else {
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context->fill ();
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}
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}
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if (outline()) {
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setup_outline_context (context);
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context->stroke ();
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}
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render_children (area, context);
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}
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void
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Lollipop::set_radius (Coord r)
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{
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if (_radius != r) {
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begin_change ();
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_radius = r;
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set_bbox_dirty ();
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end_change ();
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}
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}
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void
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Lollipop::set_x (Coord x)
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{
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if (x != _position.x) {
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begin_change ();
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_position.x = x;
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set_bbox_dirty ();
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end_change ();
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}
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}
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void
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Lollipop::set_length (Coord len)
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{
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if (_length != len) {
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begin_change ();
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_length = len;
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set_bbox_dirty ();
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end_change ();
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}
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}
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void
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Lollipop::set (Duple const & d, Coord l, Coord r)
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{
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begin_change ();
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_radius = r;
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_length = l;
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_position = d;
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set_bbox_dirty ();
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end_change ();
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}
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bool
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Lollipop::covers (Duple const & point) const
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{
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const Duple p = _parent->window_to_item (point);
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static const Distance threshold = 2.0;
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/* only the circle is considered as "covering" */
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if (((fabs (_position.x - p.x)) <= (_radius + threshold)) &&
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((fabs (_position.y - p.y)) <= (_radius + threshold))) {
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/* inside circle */
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return true;
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}
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return false;
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}
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