165 lines
3.7 KiB
C++
165 lines
3.7 KiB
C++
/*
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* Copyright (C) 2012 Carl Hetherington <carl@carlh.net>
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* Copyright (C) 2013-2017 Paul Davis <paul@linuxaudiosystems.com>
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* Copyright (C) 2015-2017 Robin Gareus <robin@gareus.org>
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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 "canvas/line_set.h"
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using namespace std;
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using namespace ArdourCanvas;
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class LineSorter {
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public:
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bool operator() (LineSet::Line const & a, LineSet::Line const & b) {
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return a.pos < b.pos;
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}
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};
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LineSet::LineSet (Canvas* c, Orientation o)
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: Item (c)
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, _extent (0)
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, _orientation (o)
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{
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}
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LineSet::LineSet (Item* parent, Orientation o)
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: Item (parent)
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, _extent (0)
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, _orientation (o)
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{
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}
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void
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LineSet::compute_bounding_box () const
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{
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if (_lines.empty ()) {
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_bounding_box = Rect ();
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} else {
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if (_orientation == Horizontal) {
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_bounding_box = Rect (0, /* x0 */
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_lines.front().pos - (_lines.front().width/2.0), /* y0 */
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_extent, /* x1 */
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_lines.back().pos - (_lines.back().width/2.0) /* y1 */
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);
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} else {
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_bounding_box = Rect (_lines.front().pos - _lines.front().width/2.0, /* x0 */
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0, /* y0 */
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_lines.back().pos + _lines.back().width/2.0, /* x1 */
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_extent /* y1 */
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);
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}
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}
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bb_clean ();
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}
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void
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LineSet::set_extent (Distance e)
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{
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begin_change ();
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_extent = e;
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_bounding_box_dirty = true;
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end_change ();
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}
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void
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LineSet::render (Rect const & area, Cairo::RefPtr<Cairo::Context> context) const
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{
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/* area is in window coordinates */
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for (vector<Line>::const_iterator i = _lines.begin(); i != _lines.end(); ++i) {
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Rect self;
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if (_orientation == Horizontal) {
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self = item_to_window (Rect (0, i->pos - (i->width/2.0), _extent, i->pos + (i->width/2.0)));
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} else {
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self = item_to_window (Rect (i->pos - (i->width/2.0), 0, i->pos + (i->width/2.0), _extent));
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}
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Rect isect = self.intersection (area);
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if (!isect) {
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continue;
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}
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Rect intersection (isect);
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Gtkmm2ext::set_source_rgba (context, i->color);
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context->set_line_width (i->width);
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/* Not 100% sure that the computation of the invariant
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* positions (y and x) below work correctly if the line width
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* is not 1.0, but visual inspection suggests it is OK.
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*/
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if (_orientation == Horizontal) {
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double y = self.y0 + ((self.y1 - self.y0)/2.0);
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context->move_to (intersection.x0, y);
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context->line_to (intersection.x1, y);
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} else {
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double x = self.x0 + ((self.x1 - self.x0)/2.0);
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context->move_to (x, intersection.y0);
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context->line_to (x, intersection.y1);
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}
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context->stroke ();
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}
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}
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void
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LineSet::add_coord (Coord y, Distance width, Gtkmm2ext::Color color)
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{
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begin_change ();
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_lines.push_back (Line (y, width, color));
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sort (_lines.begin(), _lines.end(), LineSorter());
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_bounding_box_dirty = true;
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end_change ();
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}
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void
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LineSet::clear ()
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{
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begin_change ();
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_lines.clear ();
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_bounding_box_dirty = true;
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end_change ();
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}
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bool
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LineSet::covers (Duple const & /*point*/) const
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{
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/* lines are ordered by position along primary axis, so binary search
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* to find the place to start looking.
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*
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* XXX but not yet.
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*/
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return false;
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}
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