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/*****************************************************************************
*
* This file is part of Mapnik (c++ mapping toolkit)
*
* Copyright (C) 2012 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
*
*****************************************************************************/
// mapnik
#include <mapnik/expression_string.hpp>
#include <mapnik/transform_expression.hpp>
// boost
#include <boost/foreach.hpp>
// stl
#include <sstream>
namespace mapnik {
struct transform_node_to_expression_string
: public boost::static_visitor<void>
{
std::ostringstream& os_;
transform_node_to_expression_string(std::ostringstream& os)
: os_(os) {}
void operator() (identity_node const& node) const
{
boost::ignore_unused_variable_warning(node);
}
void operator() (matrix_node const& node)
{
os_ << "matrix("
<< to_expression_string(node.a_) << ", "
<< to_expression_string(node.b_) << ", "
<< to_expression_string(node.c_) << ", "
<< to_expression_string(node.d_) << ", "
<< to_expression_string(node.e_) << ", "
<< to_expression_string(node.f_) << ")";
}
void operator() (translate_node const& node)
{
if (is_null(node.ty_))
{
os_ << "translate("
<< to_expression_string(node.tx_) << ")";
}
else
{
os_ << "translate("
<< to_expression_string(node.tx_) << ", "
<< to_expression_string(node.ty_) << ")";
}
}
void operator() (scale_node const& node)
{
if (is_null(node.sy_))
{
os_ << "scale("
<< to_expression_string(node.sx_) << ")";
}
else
{
os_ << "scale("
<< to_expression_string(node.sx_) << ", "
<< to_expression_string(node.sy_) << ")";
}
}
void operator() (rotate_node const& node)
{
if (is_null(node.cy_) || is_null(node.cy_))
{
os_ << "rotate("
<< to_expression_string(node.angle_) << ")";
}
else
{
os_ << "rotate("
<< to_expression_string(node.angle_) << ", "
<< to_expression_string(node.cx_) << ", "
<< to_expression_string(node.cy_) << ")";
}
}
void operator() (skewX_node const& node)
{
os_ << "skewX("
<< to_expression_string(node.angle_) << ")";
}
void operator() (skewY_node const& node)
{
os_ << "skewY("
<< to_expression_string(node.angle_) << ")";
}
};
std::string to_expression_string(transform_node const& node)
{
std::ostringstream os; // FIXME set precision?
transform_node_to_expression_string to_string(os);
boost::apply_visitor(to_string, *node);
return os.str();
}
std::string to_expression_string(transform_list const& list)
{
std::ostringstream os; // FIXME set precision?
std::streamsize first = 1;
transform_node_to_expression_string to_string(os);
BOOST_FOREACH (transform_node const& node, list)
{
os.write(" ", first ? (first = 0) : 1);
boost::apply_visitor(to_string, *node);
}
return os.str();
}
} // namespace mapnik
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