mirror of
https://github.com/mapnik/mapnik.git
synced 2025-09-22 06:32:52 +02:00
129 lines
3.8 KiB
C++
Executable file
129 lines
3.8 KiB
C++
Executable file
/*****************************************************************************
|
|
*
|
|
* This file is part of Mapnik (c++ mapping toolkit)
|
|
*
|
|
* Copyright (C) 2021 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_MARKERS_PLACEMENTS_POINT_HPP
|
|
#define MAPNIK_MARKERS_PLACEMENTS_POINT_HPP
|
|
|
|
#include <mapnik/geom_util.hpp>
|
|
#include <mapnik/geometry/geometry_types.hpp>
|
|
#include <mapnik/markers_placements/basic.hpp>
|
|
|
|
namespace mapnik {
|
|
|
|
template <typename Locator, typename Detector>
|
|
class markers_point_placement : public markers_basic_placement
|
|
{
|
|
public:
|
|
markers_point_placement(Locator & locator, Detector & detector,
|
|
markers_placement_params const& params)
|
|
: markers_basic_placement(params),
|
|
locator_(locator),
|
|
detector_(detector),
|
|
done_(false),
|
|
use_angle_(false)
|
|
{
|
|
locator_.rewind(0);
|
|
}
|
|
|
|
// Use angle of line
|
|
void use_angle(bool enable)
|
|
{
|
|
use_angle_ = enable;
|
|
}
|
|
|
|
// Start again at first marker. Returns the same list of markers only works when they were NOT added to the detector.
|
|
void rewind()
|
|
{
|
|
locator_.rewind(0);
|
|
done_ = false;
|
|
}
|
|
|
|
// Get next point where the marker should be placed. Returns true if a place is found, false if none is found.
|
|
bool get_point(double &x, double &y, double &angle, bool ignore_placement)
|
|
{
|
|
if (this->done_)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
angle = 0;
|
|
|
|
if (this->locator_.type() == geometry::geometry_types::LineString)
|
|
{
|
|
if (!label::middle_point(this->locator_, x, y, use_angle_ ? boost::optional<double&>(angle) : boost::none))
|
|
{
|
|
this->done_ = true;
|
|
return false;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if (!label::centroid(this->locator_, x, y))
|
|
{
|
|
this->done_ = true;
|
|
return false;
|
|
}
|
|
}
|
|
|
|
if (!this->push_to_detector(x, y, angle, ignore_placement))
|
|
{
|
|
return false;
|
|
}
|
|
|
|
this->done_ = true;
|
|
return true;
|
|
}
|
|
|
|
protected:
|
|
Locator & locator_;
|
|
Detector & detector_;
|
|
bool done_;
|
|
bool use_angle_;
|
|
|
|
// Checks transformed box placement with collision detector.
|
|
// returns false if the box:
|
|
// - a) isn't wholly inside extent and avoid_edges == true
|
|
// - b) collides with something and allow_overlap == false
|
|
// otherwise returns true, and if ignore_placement == false,
|
|
// also adds the box to collision detector
|
|
bool push_to_detector(double x, double y, double angle, bool ignore_placement)
|
|
{
|
|
auto box = perform_transform(angle, x, y);
|
|
if (params_.avoid_edges && !detector_.extent().contains(box))
|
|
{
|
|
return false;
|
|
}
|
|
if (!params_.allow_overlap && !detector_.has_placement(box))
|
|
{
|
|
return false;
|
|
}
|
|
if (!ignore_placement)
|
|
{
|
|
detector_.insert(box);
|
|
}
|
|
return true;
|
|
}
|
|
};
|
|
|
|
}
|
|
|
|
#endif // MAPNIK_MARKERS_PLACEMENTS_POINT_HPP
|