141 lines
3.9 KiB
C++
141 lines
3.9 KiB
C++
/*****************************************************************************
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*
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* This file is part of Mapnik (c++ mapping toolkit)
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*
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* Copyright (C) 2012 Artem Pavlenko
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*****************************************************************************/
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// mapnik
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#include <mapnik/expression_string.hpp>
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#include <mapnik/transform_expression.hpp>
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// stl
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#include <sstream>
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namespace mapnik {
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struct transform_node_to_expression_string
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: public boost::static_visitor<void>
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{
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std::ostringstream& os_;
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transform_node_to_expression_string(std::ostringstream& os)
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: os_(os) {}
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void operator() (identity_node const& node) const
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{
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boost::ignore_unused_variable_warning(node);
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}
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void operator() (matrix_node const& node)
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{
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os_ << "matrix("
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<< to_expression_string(node.a_) << ", "
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<< to_expression_string(node.b_) << ", "
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<< to_expression_string(node.c_) << ", "
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<< to_expression_string(node.d_) << ", "
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<< to_expression_string(node.e_) << ", "
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<< to_expression_string(node.f_) << ")";
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}
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void operator() (translate_node const& node)
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{
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if (is_null(node.ty_))
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{
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os_ << "translate("
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<< to_expression_string(node.tx_) << ")";
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}
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else
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{
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os_ << "translate("
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<< to_expression_string(node.tx_) << ", "
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<< to_expression_string(node.ty_) << ")";
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}
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}
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void operator() (scale_node const& node)
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{
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if (is_null(node.sy_))
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{
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os_ << "scale("
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<< to_expression_string(node.sx_) << ")";
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}
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else
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{
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os_ << "scale("
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<< to_expression_string(node.sx_) << ", "
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<< to_expression_string(node.sy_) << ")";
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}
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}
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void operator() (rotate_node const& node)
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{
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if (is_null(node.cy_) || is_null(node.cy_))
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{
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os_ << "rotate("
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<< to_expression_string(node.angle_) << ")";
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}
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else
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{
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os_ << "rotate("
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<< to_expression_string(node.angle_) << ", "
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<< to_expression_string(node.cx_) << ", "
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<< to_expression_string(node.cy_) << ")";
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}
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}
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void operator() (skewX_node const& node)
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{
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os_ << "skewX("
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<< to_expression_string(node.angle_) << ")";
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}
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void operator() (skewY_node const& node)
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{
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os_ << "skewY("
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<< to_expression_string(node.angle_) << ")";
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}
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};
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std::string to_expression_string(transform_node const& node)
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{
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std::ostringstream os; // FIXME set precision?
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transform_node_to_expression_string to_string(os);
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boost::apply_visitor(to_string, *node);
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return os.str();
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}
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std::string to_expression_string(transform_list const& list)
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{
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std::ostringstream os; // FIXME set precision?
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std::streamsize first = 1;
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transform_node_to_expression_string to_string(os);
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for (transform_node const& node : list)
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{
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os.write(" ", first ? (first = 0) : 1);
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boost::apply_visitor(to_string, *node);
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}
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return os.str();
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}
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} // namespace mapnik
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