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mapnik/src/map.cpp
Dane Springmeyer 6ffd0e9bc2 map size calculations: be explicit about types
2013-11-03 23:07:02 -08:00

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/*****************************************************************************
*
* This file is part of Mapnik (c++ mapping toolkit)
*
* Copyright (C) 2011 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/rule.hpp>
#include <mapnik/color.hpp>
#include <mapnik/font_set.hpp>
#include <mapnik/enumeration.hpp>
#include <mapnik/layer.hpp>
#include <mapnik/feature_type_style.hpp>
#include <mapnik/debug.hpp>
#include <mapnik/map.hpp>
#include <mapnik/datasource.hpp>
#include <mapnik/projection.hpp>
#include <mapnik/proj_transform.hpp>
#include <mapnik/ctrans.hpp>
#include <mapnik/filter_featureset.hpp>
#include <mapnik/hit_test_filter.hpp>
#include <mapnik/scale_denominator.hpp>
#include <mapnik/config_error.hpp>
#include <mapnik/config.hpp> // for PROJ_ENVELOPE_POINTS
// boost
#include <boost/make_shared.hpp>
// stl
#include <stdexcept>
namespace mapnik
{
static const char * aspect_fix_mode_strings[] = {
"GROW_BBOX",
"GROW_CANVAS",
"SHRINK_BBOX",
"SHRINK_CANVAS",
"ADJUST_BBOX_WIDTH",
"ADJUST_BBOX_HEIGHT",
"ADJUST_CANVAS_WIDTH",
"ADJUST_CANVAS_HEIGHT",
""
};
IMPLEMENT_ENUM( aspect_fix_mode_e, aspect_fix_mode_strings )
Map::Map()
: width_(400),
height_(400),
srs_(MAPNIK_LONGLAT_PROJ),
buffer_size_(0),
background_image_comp_op_(src_over),
background_image_opacity_(1.0),
aspectFixMode_(GROW_BBOX),
base_path_("") {}
Map::Map(int width,int height, std::string const& srs)
: width_(width),
height_(height),
srs_(srs),
buffer_size_(0),
background_image_comp_op_(src_over),
background_image_opacity_(1.0),
aspectFixMode_(GROW_BBOX),
base_path_("") {}
Map::Map(Map const& rhs)
: width_(rhs.width_),
height_(rhs.height_),
srs_(rhs.srs_),
buffer_size_(rhs.buffer_size_),
background_(rhs.background_),
background_image_(rhs.background_image_),
background_image_comp_op_(rhs.background_image_comp_op_),
background_image_opacity_(rhs.background_image_opacity_),
styles_(rhs.styles_),
fontsets_(rhs.fontsets_),
layers_(rhs.layers_),
aspectFixMode_(rhs.aspectFixMode_),
current_extent_(rhs.current_extent_),
maximum_extent_(rhs.maximum_extent_),
base_path_(rhs.base_path_),
extra_params_(rhs.extra_params_) {}
Map::~Map() {}
Map& Map::operator=(Map const& rhs)
{
if (this==&rhs) return *this;
width_=rhs.width_;
height_=rhs.height_;
srs_=rhs.srs_;
buffer_size_ = rhs.buffer_size_;
background_=rhs.background_;
background_image_=rhs.background_image_;
background_image_comp_op_=rhs.background_image_comp_op_;
background_image_opacity_=rhs.background_image_opacity_;
styles_=rhs.styles_;
fontsets_ = rhs.fontsets_;
layers_=rhs.layers_;
aspectFixMode_=rhs.aspectFixMode_;
maximum_extent_=rhs.maximum_extent_;
base_path_=rhs.base_path_;
extra_params_=rhs.extra_params_;
return *this;
}
std::map<std::string,feature_type_style> const& Map::styles() const
{
return styles_;
}
std::map<std::string,feature_type_style> & Map::styles()
{
return styles_;
}
Map::style_iterator Map::begin_styles()
{
return styles_.begin();
}
Map::style_iterator Map::end_styles()
{
return styles_.end();
}
Map::const_style_iterator Map::begin_styles() const
{
return styles_.begin();
}
Map::const_style_iterator Map::end_styles() const
{
return styles_.end();
}
bool Map::insert_style(std::string const& name,feature_type_style const& style)
{
return styles_.insert(make_pair(name,style)).second;
}
void Map::remove_style(std::string const& name)
{
styles_.erase(name);
}
boost::optional<feature_type_style const&> Map::find_style(std::string const& name) const
{
std::map<std::string,feature_type_style>::const_iterator itr = styles_.find(name);
if (itr != styles_.end())
return boost::optional<feature_type_style const&>(itr->second);
else
return boost::optional<feature_type_style const&>() ;
}
bool Map::insert_fontset(std::string const& name, font_set const& fontset)
{
if (fontset.get_name() != name)
{
throw mapnik::config_error("Fontset name must match the name used to reference it on the map");
}
return fontsets_.insert(make_pair(name, fontset)).second;
}
boost::optional<font_set const&> Map::find_fontset(std::string const& name) const
{
std::map<std::string,font_set>::const_iterator itr = fontsets_.find(name);
if (itr != fontsets_.end())
return boost::optional<font_set const&>(itr->second);
else
return boost::optional<font_set const&>() ;
}
std::map<std::string,font_set> const& Map::fontsets() const
{
return fontsets_;
}
std::map<std::string,font_set> & Map::fontsets()
{
return fontsets_;
}
size_t Map::layer_count() const
{
return layers_.size();
}
void Map::addLayer(layer const& l)
{
layers_.push_back(l);
}
void Map::removeLayer(size_t index)
{
layers_.erase(layers_.begin()+index);
}
void Map::remove_all()
{
layers_.clear();
styles_.clear();
}
layer const& Map::getLayer(size_t index) const
{
return layers_[index];
}
layer& Map::getLayer(size_t index)
{
return layers_[index];
}
std::vector<layer> const& Map::layers() const
{
return layers_;
}
std::vector<layer> & Map::layers()
{
return layers_;
}
unsigned Map::width() const
{
return width_;
}
unsigned Map::height() const
{
return height_;
}
void Map::set_width(unsigned width)
{
if (width != width_ &&
width >= MIN_MAPSIZE &&
width <= MAX_MAPSIZE)
{
width_=width;
fixAspectRatio();
}
}
void Map::set_height(unsigned height)
{
if (height != height_ &&
height >= MIN_MAPSIZE &&
height <= MAX_MAPSIZE)
{
height_=height;
fixAspectRatio();
}
}
void Map::resize(unsigned width,unsigned height)
{
if ((width != width_ ||
height != height_) &&
width >= MIN_MAPSIZE &&
width <= MAX_MAPSIZE &&
height >= MIN_MAPSIZE &&
height <= MAX_MAPSIZE)
{
width_=width;
height_=height;
fixAspectRatio();
}
}
std::string const& Map::srs() const
{
return srs_;
}
void Map::set_srs(std::string const& srs)
{
srs_ = srs;
}
void Map::set_buffer_size( int buffer_size)
{
buffer_size_ = buffer_size;
}
int Map::buffer_size() const
{
return buffer_size_;
}
boost::optional<color> const& Map::background() const
{
return background_;
}
void Map::set_background(color const& c)
{
background_ = c;
}
boost::optional<std::string> const& Map::background_image() const
{
return background_image_;
}
void Map::set_background_image(std::string const& image_filename)
{
background_image_ = image_filename;
}
composite_mode_e Map::background_image_comp_op() const
{
return background_image_comp_op_;
}
void Map::set_background_image_comp_op(composite_mode_e comp_op)
{
background_image_comp_op_ = comp_op;
}
float Map::background_image_opacity() const
{
return background_image_opacity_;
}
void Map::set_background_image_opacity(float opacity)
{
background_image_opacity_ = opacity;
}
void Map::set_maximum_extent(box2d<double> const& box)
{
maximum_extent_.reset(box);
}
boost::optional<box2d<double> > const& Map::maximum_extent() const
{
return maximum_extent_;
}
void Map::reset_maximum_extent()
{
maximum_extent_.reset();
}
std::string const& Map::base_path() const
{
return base_path_;
}
void Map::set_base_path(std::string const& base)
{
base_path_ = base;
}
void Map::zoom(double factor)
{
coord2d center = current_extent_.center();
double w = factor * current_extent_.width();
double h = factor * current_extent_.height();
current_extent_ = box2d<double>(center.x - 0.5 * w,
center.y - 0.5 * h,
center.x + 0.5 * w,
center.y + 0.5 * h);
fixAspectRatio();
}
void Map::zoom_all()
{
try
{
if (layers_.empty())
{
return;
}
projection proj0(srs_);
box2d<double> ext;
bool success = false;
bool first = true;
std::vector<layer>::const_iterator itr = layers_.begin();
std::vector<layer>::const_iterator end = layers_.end();
while (itr != end)
{
if (itr->active())
{
std::string const& layer_srs = itr->srs();
projection proj1(layer_srs);
proj_transform prj_trans(proj0,proj1);
box2d<double> layer_ext = itr->envelope();
if (prj_trans.backward(layer_ext, PROJ_ENVELOPE_POINTS))
{
success = true;
MAPNIK_LOG_DEBUG(map) << "map: Layer " << itr->name() << " original ext=" << itr->envelope();
MAPNIK_LOG_DEBUG(map) << "map: Layer " << itr->name() << " transformed to map srs=" << layer_ext;
if (first)
{
ext = layer_ext;
first = false;
}
else
{
ext.expand_to_include(layer_ext);
}
}
}
++itr;
}
if (success)
{
if (maximum_extent_) {
ext.clip(*maximum_extent_);
}
zoom_to_box(ext);
}
else
{
if (maximum_extent_)
{
MAPNIK_LOG_ERROR(map) << "could not zoom to combined layer extents"
<< " so falling back to maximum-extent for zoom_all result";
zoom_to_box(*maximum_extent_);
}
else
{
std::ostringstream s;
s << "could not zoom to combined layer extents "
<< "using zoom_all because proj4 could not "
<< "back project any layer extents into the map srs "
<< "(set map 'maximum-extent' to override layer extents)";
throw std::runtime_error(s.str());
}
}
}
catch (proj_init_error const& ex)
{
throw mapnik::config_error(std::string("Projection error during map.zoom_all: ") + ex.what());
}
}
void Map::zoom_to_box(box2d<double> const& box)
{
current_extent_=box;
fixAspectRatio();
}
void Map::fixAspectRatio()
{
if (current_extent_.width() > 0 && current_extent_.height() > 0)
{
double ratio1 = static_cast<double>(width_) / static_cast<double>(height_);
double ratio2 = current_extent_.width() / current_extent_.height();
if (ratio1 == ratio2) return;
switch(aspectFixMode_)
{
case ADJUST_BBOX_HEIGHT:
current_extent_.height(current_extent_.width() / ratio1);
break;
case ADJUST_BBOX_WIDTH:
current_extent_.width(current_extent_.height() * ratio1);
break;
case ADJUST_CANVAS_HEIGHT:
height_ = static_cast<unsigned>(std::floor(static_cast<double>(width_) / ratio2 + 0.5));
break;
case ADJUST_CANVAS_WIDTH:
width_ = static_cast<unsigned>(std::floor(static_cast<double>(height_) * ratio2 + 0.5));
break;
case GROW_BBOX:
if (ratio2 > ratio1)
current_extent_.height(current_extent_.width() / ratio1);
else
current_extent_.width(current_extent_.height() * ratio1);
break;
case SHRINK_BBOX:
if (ratio2 < ratio1)
current_extent_.height(current_extent_.width() / ratio1);
else
current_extent_.width(current_extent_.height() * ratio1);
break;
case GROW_CANVAS:
if (ratio2 > ratio1)
width_ = static_cast<unsigned>(std::floor(static_cast<double>(height_) * ratio2 + 0.5));
else
height_ = static_cast<unsigned>(std::floor(static_cast<double>(width_) / ratio2 + 0.5));
break;
case SHRINK_CANVAS:
if (ratio2 > ratio1)
height_ = static_cast<unsigned>(std::floor(static_cast<double>(width_) / ratio2 + 0.5));
else
width_ = static_cast<unsigned>(std::floor(static_cast<double>(height_) * ratio2 + 0.5));
break;
default:
if (ratio2 > ratio1)
current_extent_.height(current_extent_.width() / ratio1);
else
current_extent_.width(current_extent_.height() * ratio1);
break;
}
}
}
box2d<double> const& Map::get_current_extent() const
{
return current_extent_;
}
box2d<double> Map::get_buffered_extent() const
{
double extra = 2.0 * scale() * buffer_size_;
box2d<double> ext(current_extent_);
ext.width(current_extent_.width() + extra);
ext.height(current_extent_.height() + extra);
return ext;
}
void Map::pan(int x,int y)
{
int dx = x - int(0.5 * width_);
int dy = int(0.5 * height_) - y;
double s = static_cast<double>(width_)/current_extent_.width();
double minx = current_extent_.minx() + dx/s;
double maxx = current_extent_.maxx() + dx/s;
double miny = current_extent_.miny() + dy/s;
double maxy = current_extent_.maxy() + dy/s;
current_extent_.init(minx,miny,maxx,maxy);
}
void Map::pan_and_zoom(int x,int y,double factor)
{
pan(x,y);
zoom(factor);
}
double Map::scale() const
{
if (width_>0)
return current_extent_.width()/static_cast<double>(width_);
return current_extent_.width();
}
double Map::scale_denominator() const
{
projection map_proj(srs_);
return mapnik::scale_denominator( scale(), map_proj.is_geographic());
}
CoordTransform Map::view_transform() const
{
return CoordTransform(width_,height_,current_extent_);
}
featureset_ptr Map::query_point(unsigned index, double x, double y) const
{
if (!current_extent_.valid())
{
throw std::runtime_error("query_point: map extent is not intialized, you need to set a valid extent before querying");
}
if (!current_extent_.intersects(x,y))
{
throw std::runtime_error("query_point: x,y coords do not intersect map extent");
}
if (index < layers_.size())
{
mapnik::layer const& layer = layers_[index];
mapnik::datasource_ptr ds = layer.datasource();
if (ds)
{
mapnik::projection dest(srs_);
mapnik::projection source(layer.srs());
proj_transform prj_trans(source,dest);
double z = 0;
if (!prj_trans.equal() && !prj_trans.backward(x,y,z))
{
throw std::runtime_error("query_point: could not project x,y into layer srs");
}
// calculate default tolerance
mapnik::box2d<double> map_ex = current_extent_;
if (maximum_extent_)
{
map_ex.clip(*maximum_extent_);
}
if (!prj_trans.backward(map_ex,PROJ_ENVELOPE_POINTS))
{
std::ostringstream s;
s << "query_point: could not project map extent '" << map_ex
<< "' into layer srs for tolerance calculation";
throw std::runtime_error(s.str());
}
double tol = (map_ex.maxx() - map_ex.minx()) / static_cast<double>(width_) * 3;
featureset_ptr fs = ds->features_at_point(mapnik::coord2d(x,y), tol);
MAPNIK_LOG_DEBUG(map) << "map: Query at point tol=" << tol << "(" << x << "," << y << ")";
if (fs)
{
return boost::make_shared<filter_featureset<hit_test_filter> >(fs,
hit_test_filter(x,y,tol));
}
}
}
else
{
std::ostringstream s;
s << "Invalid layer index passed to query_point: '" << index << "'";
if (!layers_.empty()) s << " for map with " << layers_.size() << " layers(s)";
else s << " (map has no layers)";
throw std::out_of_range(s.str());
}
return featureset_ptr();
}
featureset_ptr Map::query_map_point(unsigned index, double x, double y) const
{
CoordTransform tr = view_transform();
tr.backward(&x,&y);
return query_point(index,x,y);
}
parameters const& Map::get_extra_parameters() const
{
return extra_params_;
}
parameters& Map::get_extra_parameters()
{
return extra_params_;
}
void Map::set_extra_parameters(parameters& params)
{
extra_params_ = params;
}
}
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