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livetrax/libs/canvas/fill.cc

109 lines
2.5 KiB
C++

/*
Copyright (C) 2011-2013 Paul Davis
Author: Carl Hetherington <cth@carlh.net>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "ardour/utils.h"
#include "pbd/compose.h"
#include "pbd/convert.h"
#include "canvas/fill.h"
#include "canvas/utils.h"
using namespace std;
using namespace ArdourCanvas;
Fill::Fill (Group* parent)
: Item (parent)
, _fill_color (0x000000ff)
, _fill (true)
, _transparent (false)
{
}
void
Fill::set_fill_color (Color color)
{
if (_fill_color != color) {
begin_visual_change ();
_fill_color = color;
double r, g, b, a;
color_to_rgba (color, r, g, b, a);
if (a == 0.0) {
_transparent = true;
} else {
_transparent = false;
}
end_visual_change ();
}
}
void
Fill::set_fill (bool fill)
{
if (_fill != fill) {
begin_visual_change ();
_fill = fill;
end_visual_change ();
}
}
void
Fill::setup_fill_context (Cairo::RefPtr<Cairo::Context> context) const
{
set_source_rgba (context, _fill_color);
}
void
Fill::setup_gradient_context (Cairo::RefPtr<Cairo::Context> context, Rect const & self, Duple const & draw_origin) const
{
Cairo::RefPtr<Cairo::LinearGradient> _gradient;
if (_vertical_gradient) {
_gradient = Cairo::LinearGradient::create (draw_origin.x, self.y0, draw_origin.x, self.y1);
} else {
_gradient = Cairo::LinearGradient::create (self.x0, draw_origin.y, self.x1, draw_origin.y);
}
for (StopList::const_iterator s = _stops.begin(); s != _stops.end(); ++s) {
double r, g, b, a;
color_to_rgba (s->second, r, g, b, a);
_gradient->add_color_stop_rgba (s->first, r, g, b, a);
}
context->set_source (_gradient);
}
void
Fill::set_gradient (StopList const & stops, bool vertical)
{
begin_visual_change ();
if (stops.empty()) {
_stops.clear ();
} else {
_stops = stops;
_vertical_gradient = vertical;
}
end_visual_change ();
}