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/*****************************************************************************
 *
 * This file is part of Mapnik (c++ mapping toolkit)
 *
 * Copyright (C) 2011 Artem Pavlenko
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 *****************************************************************************/

#ifndef MAPNIK_GRADIENT_HPP
#define MAPNIK_GRADIENT_HPP

// agg
#include <agg_trans_affine.h>

// mapnik
#include <mapnik/color.hpp>
#include <mapnik/enumeration.hpp>

// stl
#include <vector>

namespace mapnik
{

typedef std::pair<double, mapnik::color> stop_pair;
typedef std::vector<stop_pair > stop_array;

enum gradient_enum
{
    NO_GRADIENT,
    LINEAR,
    RADIAL,
    gradient_enum_MAX
};

DEFINE_ENUM( gradient_e, gradient_enum );

enum gradient_unit_enum
{
    USER_SPACE_ON_USE,
    USER_SPACE_ON_USE_BOUNDING_BOX, // used to indicate % age values were specified. This are % of the svg image extent.
    OBJECT_BOUNDING_BOX, //  (i.e., the abstract coordinate system where (0,0) is at the top/left of the object bounding box and (1,1) is at the bottom/right of the object bounding box)
    gradient_unit_enum_MAX
};

DEFINE_ENUM( gradient_unit_e, gradient_unit_enum );

class MAPNIK_DECL gradient
{
    gradient_e gradient_type_;
    stop_array stops_;
    // control points for the gradient, x1/y1 is the start point, x2/y2 the stop point.
    double x1_;
    double y1_;
    double x2_;
    double y2_;
    // for radial gradients r specifies the radius of the stop circle centered on x2/y2
    double r_;

    // units for the coordinates
    gradient_unit_e units_;

    // transform
    agg::trans_affine transform_;
public:
    gradient();
    gradient(gradient const& other);
    gradient& operator=(const gradient& rhs);

    void set_gradient_type(gradient_e grad);
    gradient_e get_gradient_type() const;

    void set_transform(agg::trans_affine const& transform);
    agg::trans_affine const&  get_transform() const;

    void set_units(gradient_unit_e units);
    gradient_unit_e get_units() const;

    void add_stop(double offset, color const& c);
    bool has_stop() const;

    stop_array const& get_stop_array() const;

    void set_control_points(double x1, double y1, double x2, double y2, double r=0);
    void get_control_points(double &x1, double &y1, double &x2, double &y2, double &r) const;
    void get_control_points(double &x1, double &y1, double &x2, double &y2) const;

private:
    void swap(const gradient& other) throw();
};
}

#endif // MAPNIK_GRADIENT_HPP