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refactor markers placements

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This commit is contained in:
Jiri Drbalek 2014-07-28 15:05:51 +00:00
parent e525ca28b5
commit 2940de0b0b
8 changed files with 713 additions and 576 deletions
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15
include/build.py
View file

@ -25,7 +25,20 @@ from glob import glob
Import('env')
base = './mapnik/'
subdirs = ['','svg','wkt','cairo','grid','json','util','group','text','text/placements','text/formatting']
subdirs = [
'',
'svg',
'wkt',
'cairo',
'grid',
'json',
'util',
'group',
'text',
'text/placements',
'text/formatting',
'markers_placements'
]
if env['SVG_RENDERER']:
subdirs.append('svg/output')

112
include/mapnik/grid/grid_marker_helpers.hpp
View file

@ -80,62 +80,20 @@ struct raster_markers_rasterizer_dispatch_grid : mapnik::noncopyable
marker_placement_enum placement_method = get<marker_placement_enum>(sym_, keys::markers_placement_type, feature_, vars_, MARKER_POINT_PLACEMENT);
bool ignore_placement = get<bool>(sym_, keys::ignore_placement, feature_, vars_, false);
bool allow_overlap = get<bool>(sym_, keys::allow_overlap, feature_, vars_, false);
box2d<double> bbox(0,0, src_.width(), src_.height());
if (placement_method != MARKER_LINE_PLACEMENT ||
path.type() == geometry_type::types::Point)
{
double x = 0;
double y = 0;
if (path.type() == geometry_type::types::LineString)
{
if (!label::middle_point(path, x, y))
{
return;
}
}
else if (placement_method == MARKER_INTERIOR_PLACEMENT)
{
if (!label::interior_position(path, x, y))
{
return;
}
}
else
{
if (!label::centroid(path, x, y))
{
return;
}
}
agg::trans_affine matrix = marker_trans_;
matrix.translate(x,y);
box2d<double> transformed_bbox = bbox * matrix;
if (allow_overlap ||
detector_.has_placement(transformed_bbox))
{
render_raster_marker(matrix);
if (!ignore_placement)
{
detector_.insert(transformed_bbox);
}
if (!placed_)
{
pixmap_.add_feature(feature_);
placed_ = true;
}
}
}
else
{
double spacing = get<double>(sym_, keys::spacing, feature_, vars_, 100.0);
double max_error = get<double>(sym_, keys::max_error, feature_, vars_, 0.2);
markers_placement<T, label_collision_detector4> placement(path, bbox, marker_trans_, detector_,
markers_placement_finder<T, label_collision_detector4> placement_finder(
placement_method,
path,
bbox,
marker_trans_,
detector_,
spacing * scale_factor_,
max_error,
allow_overlap);
double x, y, angle;
while (placement.get_point(x, y, angle, ignore_placement))
double x, y, angle = .0;
while (placement_finder.get_point(x, y, angle, ignore_placement))
{
agg::trans_affine matrix = marker_trans_;
matrix.rotate(angle);
@ -148,7 +106,6 @@ struct raster_markers_rasterizer_dispatch_grid : mapnik::noncopyable
}
}
}
}
void render_raster_marker(agg::trans_affine const& marker_tr)
{
@ -239,56 +196,21 @@ struct vector_markers_rasterizer_dispatch_grid : mapnik::noncopyable
bool ignore_placement = get<bool>(sym_, keys::ignore_placement, feature_, vars_, false);
double opacity = get<double>(sym_,keys::opacity, feature_, vars_, 1.0);
bool allow_overlap = get<bool>(sym_, keys::allow_overlap, feature_, vars_, false);
coord2d center = bbox_.center();
agg::trans_affine_translation recenter(-center.x, -center.y);
if (placement_method != MARKER_LINE_PLACEMENT ||
path.type() == geometry_type::types::Point)
{
double x = 0;
double y = 0;
if (path.type() == geometry_type::types::LineString)
{
if (!label::middle_point(path, x, y)) return;
}
else if (placement_method == MARKER_INTERIOR_PLACEMENT)
{
if (!label::interior_position(path, x, y)) return;
}
else
{
if (!label::centroid(path, x, y)) return;
}
agg::trans_affine matrix = recenter * marker_trans_;
matrix.translate(x,y);
box2d<double> transformed_bbox = bbox_ * matrix;
if (allow_overlap ||
detector_.has_placement(transformed_bbox))
{
svg_renderer_.render_id(ras_, sl_, renb_, feature_.id(), matrix, opacity, bbox_);
if (!ignore_placement)
{
detector_.insert(transformed_bbox);
}
if (!placed_)
{
pixmap_.add_feature(feature_);
placed_ = true;
}
}
}
else
{
double spacing = get<double>(sym_, keys::spacing, feature_, vars_, 100.0);
double max_error = get<double>(sym_, keys::max_error, feature_, vars_, 0.2);
markers_placement<T, Detector> placement(path, bbox_, marker_trans_, detector_,
markers_placement_finder<T, Detector> placement_finder(
placement_method,
path,
bbox_,
marker_trans_,
detector_,
spacing * scale_factor_,
max_error,
allow_overlap);
double x, y, angle;
while (placement.get_point(x, y, angle, ignore_placement))
double x, y, angle = .0;
while (placement_finder.get_point(x, y, angle, ignore_placement))
{
agg::trans_affine matrix = recenter * marker_trans_;
matrix.rotate(angle);
@ -301,7 +223,7 @@ struct vector_markers_rasterizer_dispatch_grid : mapnik::noncopyable
}
}
}
}
private:
BufferType & buf_;
pixfmt_type pixf_;

112
include/mapnik/marker_helpers.hpp
View file

@ -36,6 +36,8 @@
#include <mapnik/markers_placement.hpp>
#include <mapnik/attribute.hpp>
#include <mapnik/box2d.hpp>
#include <mapnik/vertex_converters.hpp>
#include <mapnik/label_collision_detector.hpp>
// agg
#include "agg_ellipse.h"
@ -111,28 +113,24 @@ struct vector_markers_rasterizer_dispatch : mapnik::noncopyable
bool ignore_placement = get<bool>(sym_, keys::ignore_placement, feature_, vars_, false);
bool allow_overlap = get<bool>(sym_, keys::allow_overlap, feature_, vars_, false);
double opacity = get<double>(sym_,keys::opacity, feature_, vars_, 1.0);
coord2d center = bbox_.center();
agg::trans_affine_translation recenter(-center.x, -center.y);
if (placement_method != MARKER_LINE_PLACEMENT ||
path.type() == mapnik::geometry_type::types::Point)
double spacing = get<double>(sym_, keys::spacing, feature_, vars_, 100.0);
double max_error = get<double>(sym_, keys::max_error, feature_, vars_, 0.2);
markers_placement_finder<T, Detector> placement_finder(
placement_method,
path,
bbox_,
marker_trans_,
detector_,
spacing * scale_factor_,
max_error,
allow_overlap);
double x, y, angle = .0;
while (placement_finder.get_point(x, y, angle, ignore_placement))
{
double x = 0;
double y = 0;
if (path.type() == mapnik::geometry_type::types::LineString)
{
if (!label::middle_point(path, x, y)) return;
}
else if (placement_method == MARKER_INTERIOR_PLACEMENT)
{
if (!label::interior_position(path, x, y)) return;
}
else
{
if (!label::centroid(path, x, y)) return;
}
agg::trans_affine matrix = recenter * marker_trans_;
matrix.rotate(angle);
matrix.translate(x, y);
if (snap_to_pixels_)
{
@ -140,40 +138,10 @@ struct vector_markers_rasterizer_dispatch : mapnik::noncopyable
matrix.tx = std::floor(matrix.tx + .5);
matrix.ty = std::floor(matrix.ty + .5);
}
// TODO https://github.com/mapnik/mapnik/issues/1754
box2d<double> transformed_bbox = bbox_ * matrix;
if (allow_overlap ||
detector_.has_placement(transformed_bbox))
{
svg_renderer_.render(ras_, sl_, renb_, matrix, opacity, bbox_);
if (!ignore_placement)
{
detector_.insert(transformed_bbox);
}
}
}
else
{
double spacing = get<double>(sym_, keys::spacing, feature_, vars_, 100.0);
double max_error = get<double>(sym_, keys::max_error, feature_, vars_, 0.2);
markers_placement<T, Detector> placement(path, bbox_, marker_trans_, detector_,
spacing * scale_factor_,
max_error,
allow_overlap);
double x = 0;
double y = 0;
double angle = 0;
while (placement.get_point(x, y, angle, ignore_placement))
{
agg::trans_affine matrix = recenter * marker_trans_;
matrix.rotate(angle);
matrix.translate(x, y);
svg_renderer_.render(ras_, sl_, renb_, matrix, opacity, bbox_);
}
}
}
private:
BufferType & buf_;
pixfmt_type pixf_;
@ -236,48 +204,19 @@ struct raster_markers_rasterizer_dispatch : mapnik::noncopyable
box2d<double> bbox_(0,0, src_.width(),src_.height());
double opacity = get<double>(sym_, keys::opacity, feature_, vars_, 1.0);
bool ignore_placement = get<bool>(sym_, keys::ignore_placement, feature_, vars_, false);
if (placement_method != MARKER_LINE_PLACEMENT ||
path.type() == mapnik::geometry_type::types::Point)
{
double x = 0;
double y = 0;
if (path.type() == mapnik::geometry_type::types::LineString)
{
if (!label::middle_point(path, x, y)) return;
}
else if (placement_method == MARKER_INTERIOR_PLACEMENT)
{
if (!label::interior_position(path, x, y)) return;
}
else
{
if (!label::centroid(path, x, y)) return;
}
agg::trans_affine matrix = marker_trans_;
matrix.translate(x,y);
box2d<double> transformed_bbox = bbox_ * matrix;
if (allow_overlap ||
detector_.has_placement(transformed_bbox))
{
render_raster_marker(matrix, opacity);
if (!ignore_placement)
{
detector_.insert(transformed_bbox);
}
}
}
else
{
double spacing = get<double>(sym_, keys::spacing, feature_, vars_, 100.0);
double max_error = get<double>(sym_, keys::max_error, feature_, vars_, 0.2);
markers_placement<T, label_collision_detector4> placement(path, bbox_, marker_trans_, detector_,
markers_placement_finder<T, label_collision_detector4> placement_finder(
placement_method,
path,
bbox_,
marker_trans_,
detector_,
spacing * scale_factor_,
max_error,
allow_overlap);
double x, y, angle;
while (placement.get_point(x, y, angle, ignore_placement))
double x, y, angle = .0;
while (placement_finder.get_point(x, y, angle, ignore_placement))
{
agg::trans_affine matrix = marker_trans_;
matrix.rotate(angle);
@ -285,7 +224,6 @@ struct raster_markers_rasterizer_dispatch : mapnik::noncopyable
render_raster_marker(matrix, opacity);
}
}
}
void render_raster_marker(agg::trans_affine const& marker_tr,
double opacity)

296
include/mapnik/markers_placement.hpp
View file

@ -23,83 +23,55 @@
#ifndef MAPNIK_MARKERS_PLACEMENT_HPP
#define MAPNIK_MARKERS_PLACEMENT_HPP
// mapnik
#include <mapnik/ctrans.hpp>
#include <mapnik/debug.hpp>
#include <mapnik/label_collision_detector.hpp>
#include <mapnik/global.hpp> //round
#include <mapnik/box2d.hpp>
#include <mapnik/noncopyable.hpp>
#include <mapnik/markers_placements/line.hpp>
#include <mapnik/markers_placements/point.hpp>
#include <mapnik/markers_placements/interior.hpp>
#include <mapnik/symbolizer_enumerations.hpp>
// agg
#include "agg_basics.h"
#include "agg_trans_affine.h"
#include <boost/variant.hpp>
#include <boost/functional/value_factory.hpp>
#include <boost/function.hpp>
// stl
#include <cmath>
namespace mapnik {
namespace mapnik
{
template <typename Locator, typename Detector>
class markers_placement : mapnik::noncopyable
class markers_placement_finder : mapnik::noncopyable
{
public:
/** Constructor for markers_placement object.
* \param locator Path along which markers are placed (type: vertex source)
* \param size Size of the marker
* \param tr Affine transform
* \param detector Collision detection
* \param spacing Distance between markers. If the value is negative it is
* converted to a positive value with similar magnitude, but
* choosen to optimize marker placement. 0 = no markers
*/
markers_placement(Locator &locator,
using markers_placement = boost::variant<markers_point_placement<Locator, Detector>,
markers_line_placement<Locator, Detector>,
markers_interior_placement<Locator, Detector>>;
class get_point_visitor : public boost::static_visitor<bool>
{
public:
get_point_visitor(double &x, double &y, double &angle, bool ignore_placement)
: x_(x), y_(y), angle_(angle), ignore_placement_(ignore_placement)
{
}
template <typename T>
bool operator()(T &placement) const
{
return placement.get_point(x_, y_, angle_, ignore_placement_);
}
private:
double &x_, &y_, &angle_;
bool ignore_placement_;
};
markers_placement_finder(marker_placement_e placement_type,
Locator &locator,
box2d<double> const& size,
agg::trans_affine const& tr,
Detector &detector,
double spacing,
double max_error,
bool allow_overlap)
: locator_(locator),
size_(size),
tr_(tr),
detector_(detector),
max_error_(max_error),
allow_overlap_(allow_overlap),
marker_width_((size_ * tr_).width()),
done_(false),
last_x(0.0),
last_y(0.0),
next_x(0.0),
next_y(0.0),
error_(0.0),
spacing_left_(0.0),
marker_nr_(0)
: placement_(create(placement_type, locator, size, tr, detector, spacing, max_error, allow_overlap))
{
if (spacing >= 1)
{
spacing_ = spacing;
}
else
{
spacing_ = 100;
}
rewind();
}
/** Start again at first marker.
* \note Returns the same list of markers only works when they were NOT added
* to the detector.
*/
void rewind()
{
locator_.rewind(0);
//Get first point
done_ = agg::is_stop(locator_.vertex(&next_x, &next_y));
last_x = next_x;
last_y = next_y; // Force request of new segment
error_ = 0.0;
marker_nr_ = 0;
}
/** Get a point where the marker should be placed.
@ -112,182 +84,38 @@ public:
*/
bool get_point(double &x, double &y, double &angle, bool ignore_placement)
{
if (done_)
{
return false;
}
unsigned cmd;
/* This functions starts at the position of the previous marker,
walks along the path, counting how far it has to go in spacing_left.
If one marker can't be placed at the position it should go to it is
moved a bit. The error is compensated for in the next call to this
function.
error > 0: Marker too near to the end of the path.
error = 0: Perfect position.
error < 0: Marker too near to the beginning of the path.
*/
if (marker_nr_ == 0)
{
//First marker
marker_nr_++;
spacing_left_ = spacing_ / 2;
}
else
{
spacing_left_ = spacing_;
}
spacing_left_ -= error_;
error_ = 0.0;
double max_err_allowed = max_error_ * spacing_;
// Loop exits when a position is found or when no more segments are available
while (true)
{
// Do not place markers too close to the beginning of a segment
if (spacing_left_ < marker_width_/2)
{
set_spacing_left(marker_width_/2); //Only moves forward
}
// Error for this marker is too large. Skip to the next position.
if (std::fabs(error_) > max_err_allowed)
{
if (error_ > spacing_)
{
error_ = spacing_; // Avoid moving backwards
}
spacing_left_ += spacing_ - error_;
error_ = 0.0;
}
double dx = next_x - last_x;
double dy = next_y - last_y;
double segment_length = std::sqrt(dx * dx + dy * dy);
if (segment_length <= spacing_left_)
{
//Segment is too short to place marker. Find next segment
spacing_left_ -= segment_length;
last_x = next_x;
last_y = next_y;
while (agg::is_move_to(cmd = locator_.vertex(&next_x, &next_y)))
{
//Skip over "move" commands
last_x = next_x;
last_y = next_y;
}
if (agg::is_stop(cmd) || cmd == SEG_CLOSE)
{
done_ = true;
return false;
}
continue; //Try again
}
/* At this point we know the following things:
- segment_length > spacing_left
- error is small enough
- at least half a marker fits into this segment
*/
//Check if marker really fits in this segment
if (segment_length < marker_width_)
{
//Segment to short => Skip this segment
set_spacing_left(segment_length + marker_width_/2); //Only moves forward
continue;
}
else if (segment_length - spacing_left_ < marker_width_/2)
{
//Segment is long enough, but we are to close to the end
//Note: This function moves backwards. This could lead to an infinite
// loop when another function adds a positive offset. Therefore we
// only move backwards when there is no offset
if (error_ == 0)
{
set_spacing_left(segment_length - marker_width_/2, true);
}
else
{
//Skip this segment
set_spacing_left(segment_length + marker_width_/2); //Only moves forward
}
continue; //Force checking of max_error constraint
}
angle = std::atan2(dy, dx);
x = last_x + dx * (spacing_left_ / segment_length);
y = last_y + dy * (spacing_left_ / segment_length);
box2d<double> box = perform_transform(angle, x, y);
if (!allow_overlap_ && !detector_.has_placement(box))
{
//10.0 is the approximate number of positions tried and choosen arbitrarily
set_spacing_left(spacing_left_ + spacing_ * max_error_ / 10.0); //Only moves forward
continue;
}
if (!ignore_placement)
{
detector_.insert(box);
}
last_x = x;
last_y = y;
return true;
}
return boost::apply_visitor(get_point_visitor(x, y, angle, ignore_placement), placement_);
}
private:
Locator &locator_;
box2d<double> size_;
agg::trans_affine tr_;
Detector &detector_;
double spacing_;
double max_error_;
bool allow_overlap_;
double marker_width_;
bool done_;
double last_x;
double last_y;
double next_x;
double next_y;
/** If a marker could not be placed at the exact point where it should
* go the next marker's distance will be a bit lower. */
double error_;
double spacing_left_;
unsigned marker_nr_;
/** Rotates the size_ box and translates the position. */
box2d<double> perform_transform(double angle, double dx, double dy)
/** Factory function for particular placement implementations.
*/
static markers_placement create(marker_placement_e placement_type,
Locator &locator,
box2d<double> const& size,
agg::trans_affine const& tr,
Detector &detector,
double spacing,
double max_error,
bool allow_overlap)
{
double x1 = size_.minx();
double x2 = size_.maxx();
double y1 = size_.miny();
double y2 = size_.maxy();
agg::trans_affine tr = tr_ * agg::trans_affine_rotation(angle).translate(dx, dy);
double xA = x1, yA = y1, xB = x2, yB = y1, xC = x2, yC = y2, xD = x1, yD = y2;
tr.transform(&xA, &yA);
tr.transform(&xB, &yB);
tr.transform(&xC, &yC);
tr.transform(&xD, &yD);
box2d<double> result(xA, yA, xC, yC);
result.expand_to_include(xB, yB);
result.expand_to_include(xD, yD);
return result;
}
/** Set spacing_left_, adjusts error_ and performs sanity checks. */
void set_spacing_left(double sl, bool allow_negative=false)
{
double delta_error = sl - spacing_left_;
if (!allow_negative && delta_error < 0)
{
MAPNIK_LOG_WARN(markers_placement) << "Unexpected negative error in markers_placement. Please file a bug report.";
return;
}
#ifdef MAPNIK_DEBUG
if (delta_error == 0.0)
{
MAPNIK_LOG_WARN(markers_placement) << "Not moving at all in set_spacing_left()! Please file a bug report.";
}
#endif
error_ += delta_error;
spacing_left_ = sl;
static const std::map<marker_placement_e, boost::function<markers_placement(
Locator &locator,
box2d<double> const& size,
agg::trans_affine const& tr,
Detector &detector,
double spacing,
double max_error,
bool allow_overlap)>> factories =
{
{ MARKER_POINT_PLACEMENT, boost::value_factory<markers_point_placement<Locator, Detector>>() },
{ MARKER_INTERIOR_PLACEMENT, boost::value_factory<markers_interior_placement<Locator, Detector>>() },
{ MARKER_LINE_PLACEMENT, boost::value_factory<markers_line_placement<Locator, Detector>>() }
};
return factories.at(placement_type)(locator, size, tr, detector, spacing, max_error, allow_overlap);
}
markers_placement placement_;
};
}

99
include/mapnik/markers_placements/interior.hpp Normal file
View file

@ -0,0 +1,99 @@
/*****************************************************************************
*
* This file is part of Mapnik (c++ mapping toolkit)
*
* Copyright (C) 2014 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_INTERIOR_HPP
#define MAPNIK_MARKERS_PLACEMENTS_INTERIOR_HPP
#include <mapnik/markers_placements/point.hpp>
#include <mapnik/geom_util.hpp>
namespace mapnik {
template <typename Locator, typename Detector>
class markers_interior_placement : public markers_point_placement<Locator, Detector>
{
public:
markers_interior_placement(
Locator &locator,
box2d<double> const& size,
agg::trans_affine const& tr,
Detector &detector,
double spacing,
double max_error,
bool allow_overlap)
: markers_point_placement<Locator, Detector>(
locator, size, tr, detector,
spacing, max_error, allow_overlap)
{
}
bool get_point(double &x, double &y, double &angle, bool ignore_placement)
{
if (this->done_)
{
return false;
}
if (this->locator_.type() == mapnik::geometry_type::types::Point)
{
return markers_point_placement<Locator, Detector>::get_point(x, y, angle, ignore_placement);
}
if (this->locator_.type() == mapnik::geometry_type::types::LineString)
{
if (!label::middle_point(this->locator_, x, y))
{
this->done_ = true;
return false;
}
}
else
{
if (!label::interior_position(this->locator_, x, y))
{
this->done_ = true;
return false;
}
}
angle = 0;
box2d<double> box = this->perform_transform(angle, x, y);
if (!this->allow_overlap_ && !this->detector_.has_placement(box))
{
return false;
}
if (!ignore_placement)
{
this->detector_.insert(box);
}
this->done_ = true;
return true;
}
};
}
#endif // MAPNIK_MARKERS_PLACEMENTS_INTERIOR_HPP

241
include/mapnik/markers_placements/line.hpp Normal file
View file

@ -0,0 +1,241 @@
/*****************************************************************************
*
* This file is part of Mapnik (c++ mapping toolkit)
*
* Copyright (C) 2014 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_LINE_HPP
#define MAPNIK_MARKERS_PLACEMENTS_LINE_HPP
#include <mapnik/markers_placements/point.hpp>
#include <mapnik/ctrans.hpp>
#include <mapnik/debug.hpp>
#include <mapnik/global.hpp> //round
#include <cmath>
namespace mapnik {
template <typename Locator, typename Detector>
class markers_line_placement : public markers_point_placement<Locator, Detector>
{
public:
markers_line_placement(Locator &locator,
box2d<double> const& size,
agg::trans_affine const& tr,
Detector &detector,
double spacing,
double max_error,
bool allow_overlap)
: markers_point_placement<Locator, Detector>(
locator, size, tr, detector,
spacing, max_error, allow_overlap),
last_x(0.0),
last_y(0.0),
next_x(0.0),
next_y(0.0),
error_(0.0),
spacing_left_(0.0),
marker_nr_(0)
{
if (spacing >= 1)
{
this->spacing_ = spacing;
}
else
{
this->spacing_ = 100;
}
rewind();
}
void rewind()
{
this->locator_.rewind(0);
//Get first point
this->done_ = agg::is_stop(this->locator_.vertex(&next_x, &next_y));
last_x = next_x;
last_y = next_y; // Force request of new segment
error_ = 0.0;
marker_nr_ = 0;
}
bool get_point(double &x, double &y, double &angle, bool ignore_placement)
{
if (this->done_)
{
return false;
}
if (this->locator_.type() == mapnik::geometry_type::types::Point)
{
return markers_point_placement<Locator, Detector>::get_point(x, y, angle, ignore_placement);
}
unsigned cmd;
/* This functions starts at the position of the previous marker,
walks along the path, counting how far it has to go in spacing_left.
If one marker can't be placed at the position it should go to it is
moved a bit. The error is compensated for in the next call to this
function.
error > 0: Marker too near to the end of the path.
error = 0: Perfect position.
error < 0: Marker too near to the beginning of the path.
*/
if (marker_nr_ == 0)
{
//First marker
marker_nr_++;
this->spacing_left_ = this->spacing_ / 2;
}
else
{
this->spacing_left_ = this->spacing_;
}
spacing_left_ -= error_;
error_ = 0.0;
double max_err_allowed = this->max_error_ * this->spacing_;
//Loop exits when a position is found or when no more segments are available
while (true)
{
//Do not place markers too close to the beginning of a segment
if (spacing_left_ < this->marker_width_/2)
{
set_spacing_left(this->marker_width_/2); //Only moves forward
}
//Error for this marker is too large. Skip to the next position.
if (std::fabs(error_) > max_err_allowed)
{
while (this->error_ > this->spacing_)
{
error_ -= this->spacing_; //Avoid moving backwards
}
spacing_left_ += this->spacing_ - this->error_;
error_ = 0.0;
}
double dx = next_x - last_x;
double dy = next_y - last_y;
double segment_length = std::sqrt(dx * dx + dy * dy);
if (segment_length <= spacing_left_)
{
//Segment is too short to place marker. Find next segment
spacing_left_ -= segment_length;
last_x = next_x;
last_y = next_y;
while (agg::is_move_to(cmd = this->locator_.vertex(&next_x, &next_y)))
{
//Skip over "move" commands
last_x = next_x;
last_y = next_y;
}
if (agg::is_stop(cmd) || cmd == SEG_CLOSE)
{
this->done_ = true;
return false;
}
continue; //Try again
}
/* At this point we know the following things:
- segment_length > spacing_left
- error is small enough
- at least half a marker fits into this segment
*/
//Check if marker really fits in this segment
if (segment_length < this->marker_width_)
{
//Segment to short => Skip this segment
set_spacing_left(segment_length + this->marker_width_/2); //Only moves forward
continue;
}
else if (segment_length - spacing_left_ < this->marker_width_/2)
{
//Segment is long enough, but we are to close to the end
//Note: This function moves backwards. This could lead to an infinite
// loop when another function adds a positive offset. Therefore we
// only move backwards when there is no offset
if (error_ == 0)
{
set_spacing_left(segment_length - this->marker_width_/2, true);
}
else
{
//Skip this segment
set_spacing_left(segment_length + this->marker_width_/2); //Only moves forward
}
continue; //Force checking of max_error constraint
}
angle = std::atan2(dy, dx);
x = last_x + dx * (spacing_left_ / segment_length);
y = last_y + dy * (spacing_left_ / segment_length);
box2d<double> box = this->perform_transform(angle, x, y);
if (!this->allow_overlap_ && !this->detector_.has_placement(box))
{
//10.0 is the approxmiate number of positions tried and choosen arbitrarily
set_spacing_left(spacing_left_ + this->spacing_ * this->max_error_ / 10.0); //Only moves forward
continue;
}
if (!ignore_placement)
{
this->detector_.insert(box);
}
last_x = x;
last_y = y;
return true;
}
}
private:
double last_x;
double last_y;
double next_x;
double next_y;
/** If a marker could not be placed at the exact point where it should
* go the next marker's distance will be a bit lower. */
double error_;
double spacing_left_;
unsigned marker_nr_;
/** Set spacing_left_, adjusts error_ and performs sanity checks. */
void set_spacing_left(double sl, bool allow_negative=false)
{
double delta_error = sl - spacing_left_;
if (!allow_negative && delta_error < 0)
{
MAPNIK_LOG_WARN(markers_line_placement)
<< "Unexpected negative error in markers_line_placement. "
"Please file a bug report.";
return;
}
#ifdef MAPNIK_DEBUG
if (delta_error == 0.0)
{
MAPNIK_LOG_WARN(markers_line_placement)
<< "Not moving at all in set_spacing_left()! "
"Please file a bug report.";
}
#endif
error_ += delta_error;
spacing_left_ = sl;
}
};
}
#endif // MAPNIK_MARKERS_PLACEMENTS_LINE_HPP

157
include/mapnik/markers_placements/point.hpp Normal file
View file

@ -0,0 +1,157 @@
/*****************************************************************************
*
* This file is part of Mapnik (c++ mapping toolkit)
*
* Copyright (C) 2014 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/markers_placements/point.hpp>
#include <mapnik/geom_util.hpp>
#include "agg_basics.h"
#include "agg_trans_affine.h"
namespace mapnik {
template <typename Locator, typename Detector>
class markers_point_placement
{
public:
markers_point_placement(
Locator &locator,
box2d<double> const& size,
agg::trans_affine const& tr,
Detector &detector,
double spacing,
double max_error,
bool allow_overlap)
: locator_(locator),
size_(size),
tr_(tr),
detector_(detector),
spacing_(spacing),
max_error_(max_error),
allow_overlap_(allow_overlap),
marker_width_((size_ * tr_).width()),
done_(false)
{
rewind();
}
/** Start again at first marker.
* \note Returns the same list of markers only works when they were NOT added
* to the detector.
*/
virtual void rewind()
{
locator_.rewind(0);
done_ = false;
}
/** Get a point where the marker should be placed.
* Each time this function is called a new point is returned.
* \param x Return value for x position
* \param y Return value for x position
* \param angle Return value for rotation angle
* \param ignore_placement Whether to add selected position to detector
* \return True if a place is found, false if none is found.
*/
virtual bool get_point(double &x, double &y, double &angle, bool ignore_placement)
{
if (done_)
{
return false;
}
if (locator_.type() == mapnik::geometry_type::types::LineString)
{
if (!label::middle_point(locator_, x, y))
{
done_ = true;
return false;
}
}
else
{
if (!label::centroid(locator_, x, y))
{
done_ = true;
return false;
}
}
angle = 0;
box2d<double> box = perform_transform(angle, x, y);
if (!allow_overlap_ && !detector_.has_placement(box))
{
return false;
}
if (!ignore_placement)
{
detector_.insert(box);
}
done_ = true;
return true;
}
protected:
Locator &locator_;
box2d<double> size_;
agg::trans_affine tr_;
Detector &detector_;
double spacing_;
double max_error_;
bool allow_overlap_;
double marker_width_;
bool done_;
/** Rotates the size_ box and translates the position. */
box2d<double> perform_transform(double angle, double dx, double dy)
{
double x1 = size_.minx();
double x2 = size_.maxx();
double y1 = size_.miny();
double y2 = size_.maxy();
agg::trans_affine tr = tr_ * agg::trans_affine_rotation(angle)
.translate(dx, dy);
double xA = x1, yA = y1,
xB = x2, yB = y1,
xC = x2, yC = y2,
xD = x1, yD = y2;
tr.transform(&xA, &yA);
tr.transform(&xB, &yB);
tr.transform(&xC, &yC);
tr.transform(&xD, &yD);
box2d<double> result(xA, yA, xC, yC);
result.expand_to_include(xB, yB);
result.expand_to_include(xD, yD);
return result;
}
};
}
#endif // MAPNIK_MARKERS_PLACEMENTS_POINT_HPP

119
src/cairo/cairo_renderer.cpp
View file

@ -798,62 +798,36 @@ struct markers_dispatch : mapnik::noncopyable
template <typename T>
void add_path(T & path)
{
marker_placement_enum placement_method = get<marker_placement_enum>(sym_, keys::markers_placement_type, feature_, vars_, MARKER_POINT_PLACEMENT);
marker_placement_enum placement_method = get<marker_placement_enum>(
sym_, keys::markers_placement_type, feature_, vars_, MARKER_POINT_PLACEMENT);
bool ignore_placement = get<bool>(sym_, keys::ignore_placement, feature_, vars_, false);
bool allow_overlap = get<bool>(sym_, keys::allow_overlap, feature_, vars_, false);
double opacity = get<double>(sym_, keys::opacity, feature_, vars_, 1.0);
double spacing = get<double>(sym_, keys::spacing, feature_, vars_, 100.0);
double max_error = get<double>(sym_, keys::max_error, feature_, vars_, 0.2);
if (placement_method != MARKER_LINE_PLACEMENT ||
path.type() == geometry_type::types::Point)
{
double x = 0;
double y = 0;
if (path.type() == geometry_type::types::LineString)
{
if (!label::middle_point(path, x, y)) return;
}
else if (placement_method == MARKER_INTERIOR_PLACEMENT)
{
if (!label::interior_position(path, x, y)) return;
}
else
{
if (!label::centroid(path, x, y)) return;
}
coord2d center = bbox_.center();
agg::trans_affine matrix = agg::trans_affine_translation(-center.x, -center.y);
matrix *= marker_trans_;
matrix *=agg::trans_affine_translation(x, y);
box2d<double> transformed_bbox = bbox_ * matrix;
if (allow_overlap ||
detector_.has_placement(transformed_bbox))
{
render_vector_marker(ctx_, pixel_position(x,y), marker_, bbox_, attributes_, marker_trans_, opacity, true);
if (!ignore_placement)
{
detector_.insert(transformed_bbox);
}
}
}
else
{
markers_placement<T, label_collision_detector4> placement(path, bbox_, marker_trans_, detector_,
markers_placement_finder<T, label_collision_detector4> placement_finder(
placement_method,
path,
bbox_,
marker_trans_,
detector_,
spacing * scale_factor_,
max_error,
allow_overlap);
double x, y, angle;
while (placement.get_point(x, y, angle, ignore_placement))
double x, y, angle = .0;
while (placement_finder.get_point(x, y, angle, ignore_placement))
{
agg::trans_affine matrix = marker_trans_;
matrix.rotate(angle);
render_vector_marker(ctx_, pixel_position(x,y), marker_, bbox_, attributes_, matrix, opacity, true);
}
render_vector_marker(
ctx_,
pixel_position(x, y),
marker_,
bbox_,
attributes_,
matrix,
opacity,
true);
}
}
@ -899,62 +873,27 @@ struct raster_markers_dispatch : mapnik::noncopyable
double max_error = get<double>(sym_, keys::max_error, feature_, vars_, 0.2);
bool allow_overlap = get<bool>(sym_, keys::allow_overlap, feature_, vars_, false);
bool ignore_placement = get<bool>(sym_, keys::ignore_placement, feature_, vars_, false);
if (placement_method != MARKER_LINE_PLACEMENT ||
path.type() == geometry_type::types::Point)
{
double x = 0;
double y = 0;
if (path.type() == geometry_type::types::LineString)
{
if (!label::middle_point(path, x, y))
return;
}
else if (placement_method == MARKER_INTERIOR_PLACEMENT)
{
if (!label::interior_position(path, x, y))
return;
}
else
{
if (!label::centroid(path, x, y))
return;
}
coord2d center = bbox_.center();
agg::trans_affine matrix = agg::trans_affine_translation(-center.x, -center.y);
matrix *= marker_trans_;
matrix *=agg::trans_affine_translation(x, y);
box2d<double> transformed_bbox = bbox_ * matrix;
if (allow_overlap ||
detector_.has_placement(transformed_bbox))
{
ctx_.add_image(matrix, marker_, opacity);
if (!ignore_placement)
{
detector_.insert(transformed_bbox);
}
}
}
else
{
markers_placement<T, label_collision_detector4> placement(path, bbox_, marker_trans_, detector_,
markers_placement_finder<T, label_collision_detector4> placement_finder(
placement_method,
path,
bbox_,
marker_trans_,
detector_,
spacing * scale_factor_,
max_error,
allow_overlap);
double x, y, angle;
while (placement.get_point(x, y, angle, ignore_placement))
double x, y, angle = .0;
while (placement_finder.get_point(x, y, angle, ignore_placement))
{
coord2d center = bbox_.center();
agg::trans_affine matrix = agg::trans_affine_translation(-center.x, -center.y);
agg::trans_affine matrix = agg::trans_affine_translation(
-center.x, -center.y);
matrix *= marker_trans_;
matrix *= agg::trans_affine_rotation(angle);
matrix *= agg::trans_affine_translation(x, y);
ctx_.add_image(matrix, marker_, opacity);
}
}
}
ImageMarker & marker_;
Detector & detector_;