Paul Davis
57ff5e3198
note: the solution is non-obvious, but the obvious one of applying a translational Cairo::Matrix to the gradient caused an exception to be thrown because of a non-invertible matrix.
97 lines
2.1 KiB
C++
97 lines
2.1 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 "ardour/utils.h"
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#include "pbd/compose.h"
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#include "pbd/convert.h"
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#include "canvas/fill.h"
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#include "canvas/utils.h"
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using namespace std;
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using namespace ArdourCanvas;
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Fill::Fill (Group* parent)
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: Item (parent)
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, _fill_color (0x000000ff)
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, _fill (true)
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{
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}
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void
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Fill::set_fill_color (Color color)
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{
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if (_fill_color != color) {
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begin_visual_change ();
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_fill_color = color;
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end_visual_change ();
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}
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}
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void
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Fill::set_fill (bool fill)
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{
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if (_fill != fill) {
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begin_visual_change ();
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_fill = fill;
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end_visual_change ();
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}
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}
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void
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Fill::setup_fill_context (Cairo::RefPtr<Cairo::Context> context) const
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{
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if (_gradient) {
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Cairo::Matrix m;
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Duple origin = item_to_window (Duple (0, 0));
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context->translate (origin.x, origin.y);
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context->set_source (_gradient);
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context->translate (-origin.x, -origin.y);
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} else {
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set_source_rgba (context, _fill_color);
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}
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}
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void
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Fill::set_gradient (StopList const & stops, double height)
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{
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begin_visual_change ();
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if (stops.empty()) {
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_gradient.clear();
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} else {
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double r, g, b, a;
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_gradient = Cairo::LinearGradient::create (0, 0, 0, height);
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for (StopList::const_iterator s = stops.begin(); s != stops.end(); ++s) {
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color_to_rgba (s->second, r, g, b, a);
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_gradient->add_color_stop_rgba (s->first, r, g, b, a);
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}
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}
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end_visual_change ();
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}
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