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.
106 lines
2.3 KiB
C++
106 lines
2.3 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 "canvas/poly_line.h"
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#include "canvas/canvas.h"
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#include "canvas/utils.h"
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using namespace ArdourCanvas;
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PolyLine::PolyLine (Canvas* c)
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: PolyItem (c)
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, _threshold (1.0)
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{
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}
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PolyLine::PolyLine (Group* g)
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: PolyItem (g)
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, _threshold (1.0)
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{
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}
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void
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PolyLine::render (Rect const & area, Cairo::RefPtr<Cairo::Context> context) const
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{
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if (_outline) {
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setup_outline_context (context);
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render_path (area, context);
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context->stroke ();
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}
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}
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bool
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PolyLine::covers (Duple const & point) const
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{
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Duple p = window_to_item (point);
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const Points::size_type npoints = _points.size();
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if (npoints < 2) {
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return false;
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}
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Points::size_type i;
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Points::size_type j;
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/* repeat for each line segment */
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const Rect visible (window_to_item (_canvas->visible_area()));
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for (i = 1, j = 0; i < npoints; ++i, ++j) {
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Duple at;
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double t;
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Duple a (_points[j]);
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Duple b (_points[i]);
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/*
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Clamp the line endpoints to the visible area of the canvas. If we do
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not do this, we may have a line segment extending to COORD_MAX and our
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math goes wrong.
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*/
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a.x = std::min (a.x, visible.x1);
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a.y = std::min (a.y, visible.y1);
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b.x = std::min (b.x, visible.x1);
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b.y = std::min (b.y, visible.y1);
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double d = distance_to_segment_squared (p, a, b, t, at);
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if (t < 0.0 || t > 1.0) {
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continue;
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}
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if (d < _threshold + _outline_width) {
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return true;
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}
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}
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return false;
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}
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void
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PolyLine::set_covers_threshold (double t)
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{
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_threshold = t;
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}
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