livetrax/libs/canvas/fill.cc

/*
    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)
{

}

void
Fill::set_fill_color (Color color)
{
	begin_visual_change ();
	
	_fill_color = color;

	end_visual_change ();
}

void
Fill::set_fill (bool fill)
{
	begin_visual_change ();
	
	_fill = fill;

	end_visual_change ();
}

void
Fill::setup_fill_context (Cairo::RefPtr<Cairo::Context> context) const
{
	if (_gradient) {
		context->set_source (_gradient);
	} else {
		set_source_rgba (context, _fill_color);
	}
}

void
Fill::set_gradient (StopList const & stops, double height)
{
	begin_visual_change ();

	if (stops.empty()) {
		_gradient.clear();
	} else {

		double r, g, b, a;
		
		_gradient = Cairo::LinearGradient::create (0, 0, 0, height);
		
		for (StopList::const_iterator s = stops.begin(); s != stops.end(); ++s) {
			color_to_rgba (s->second, r, g, b, a);
			_gradient->add_color_stop_rgba (s->first, r, g, b, a);
		}
	}

	end_visual_change ();
}