166 lines
5.2 KiB
C++
166 lines
5.2 KiB
C++
/*****************************************************************************
|
|
*
|
|
* This file is part of Mapnik (c++ mapping toolkit)
|
|
*
|
|
* Copyright (C) 2006 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
|
|
*
|
|
*****************************************************************************/
|
|
|
|
//$Id$
|
|
|
|
#ifndef MARKERS_CONVERTER_HPP
|
|
#define MARKERS_CONVERTER_HPP
|
|
|
|
#include "agg_basics.h"
|
|
#include "agg_trans_affine.h"
|
|
#include <boost/utility.hpp>
|
|
|
|
namespace mapnik {
|
|
template <typename Locator, typename Shape, typename Detector>
|
|
class markers_converter : boost::noncopyable
|
|
{
|
|
public:
|
|
markers_converter(Locator & locator,Shape & shape, Detector & detector);
|
|
void rewind(unsigned path_id);
|
|
unsigned vertex(double * x, double * y);
|
|
private:
|
|
enum status_e
|
|
{
|
|
initial,
|
|
markers,
|
|
polygon,
|
|
stop
|
|
};
|
|
|
|
Locator & locator_;
|
|
Shape & shape_;
|
|
Detector & detector_;
|
|
status_e status_;
|
|
agg::trans_affine transform_;
|
|
agg::trans_affine mtx_;
|
|
unsigned num_markers_;
|
|
unsigned marker_;
|
|
};
|
|
|
|
template <typename Locator,typename Shape,typename Detector>
|
|
markers_converter<Locator,Shape,Detector>::markers_converter(Locator & locator,Shape & shape,
|
|
Detector & detector)
|
|
: locator_(locator),
|
|
shape_(shape),
|
|
detector_(detector),
|
|
status_(initial),
|
|
num_markers_(1),
|
|
marker_(0) {}
|
|
|
|
template <typename Locator, typename Shape,typename Detector>
|
|
void markers_converter<Locator,Shape,Detector>::rewind(unsigned path_id)
|
|
{
|
|
status_ = initial;
|
|
marker_ = 0;
|
|
num_markers_ = 1;
|
|
}
|
|
|
|
template <typename Locator, typename Shape, typename Detector>
|
|
unsigned markers_converter<Locator,Shape,Detector>::vertex( double * x, double * y)
|
|
{
|
|
unsigned cmd = agg::path_cmd_move_to;
|
|
|
|
double x1, y1, x2, y2;
|
|
while (!agg::is_stop(cmd))
|
|
{
|
|
switch (status_)
|
|
{
|
|
case initial:
|
|
if (num_markers_ == 0 )
|
|
{
|
|
cmd = agg::path_cmd_stop;
|
|
break;
|
|
}
|
|
locator_.rewind(marker_++);
|
|
status_ = markers;
|
|
num_markers_ = 0;
|
|
break;
|
|
case markers:
|
|
{
|
|
unsigned cmd1;
|
|
while (agg::is_move_to(cmd1 = locator_.vertex(&x1,&y1)));
|
|
if (agg::is_stop(cmd1))
|
|
{
|
|
status_ = stop;
|
|
break;
|
|
}
|
|
unsigned cmd2 = locator_.vertex(&x2,&y2);
|
|
if (agg::is_stop(cmd2))
|
|
{
|
|
status_ = stop;
|
|
break;
|
|
}
|
|
|
|
|
|
++num_markers_;
|
|
double dx = x2 - x1;
|
|
double dy = y2 - y1;
|
|
double d = ::sqrt(dx * dx + dy * dy);
|
|
Envelope<double> ext = shape_.extent();
|
|
if (d > ext.width())
|
|
{
|
|
mtx_ = transform_;
|
|
mtx_ *= agg::trans_affine_rotation(::atan2(dy,dx));
|
|
double marker_x = x1 + dx * 0.5;
|
|
double marker_y = y1 + dy * 0.5;
|
|
|
|
mtx_ *= agg::trans_affine_translation(marker_x,marker_y);
|
|
|
|
double minx = ext.minx();
|
|
double miny = ext.miny();
|
|
double maxx = ext.maxx();
|
|
double maxy = ext.maxy();
|
|
mtx_.transform(&minx,&miny);
|
|
mtx_.transform(&maxx,&maxy);
|
|
|
|
Envelope<double> e0(minx,miny,maxx,maxy);
|
|
|
|
if (detector_.has_placement(e0))
|
|
{
|
|
shape_.rewind(0);
|
|
status_ = polygon;
|
|
detector_.insert(ext);
|
|
}
|
|
}
|
|
|
|
break;
|
|
}
|
|
case polygon:
|
|
cmd = shape_.vertex(x,y);
|
|
if (agg::is_stop(cmd))
|
|
{
|
|
cmd = agg::path_cmd_move_to;
|
|
status_ = markers;
|
|
break;
|
|
}
|
|
mtx_.transform(x,y);
|
|
return cmd;
|
|
case stop:
|
|
cmd = agg::path_cmd_stop;
|
|
break;
|
|
}
|
|
}
|
|
return cmd;
|
|
}
|
|
}
|
|
|
|
#endif // MARKERS_CONVERTER_HPP
|