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mapnik_map.cpp
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mapnik_map.cpp
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#include <node_buffer.h>
// mapnik
// mapnik renderers
#include <mapnik/agg_renderer.hpp>
#include <mapnik/grid/grid_renderer.hpp>
#if defined(HAVE_CAIRO)
#include <mapnik/cairo_renderer.hpp>
#endif
#include <mapnik/version.hpp>
#include <mapnik/feature_type_style.hpp>
#include <mapnik/map.hpp>
#include <mapnik/projection.hpp>
#include <mapnik/layer.hpp>
#if MAPNIK_VERSION >= 200100
#include <mapnik/expression.hpp>
#else
#include <mapnik/filter_factory.hpp>
#endif
#include <mapnik/image_util.hpp>
#include <mapnik/config_error.hpp>
#include <mapnik/load_map.hpp>
#include <mapnik/save_map.hpp>
#include <mapnik/query.hpp>
#include <mapnik/ctrans.hpp>
// stl
#include <exception>
#include <set>
// boost
#include <boost/foreach.hpp>
#include <boost/make_shared.hpp>
#include <boost/optional/optional.hpp>
#include "utils.hpp"
#include "js_grid_utils.hpp"
#include "mapnik_map.hpp"
#include "mapnik_layer.hpp"
#include "mapnik_featureset.hpp"
#include "mapnik_image.hpp"
#include "mapnik_grid.hpp"
#include "mapnik_palette.hpp"
#include "mapnik_color.hpp"
#if MAPNIK_VERSION < 200100
#define key_name get_key
#endif
Persistent<FunctionTemplate> Map::constructor;
void Map::Initialize(Handle<Object> target) {
HandleScope scope;
constructor = Persistent<FunctionTemplate>::New(FunctionTemplate::New(Map::New));
constructor->InstanceTemplate()->SetInternalFieldCount(1);
constructor->SetClassName(String::NewSymbol("Map"));
NODE_SET_PROTOTYPE_METHOD(constructor, "load", load);
NODE_SET_PROTOTYPE_METHOD(constructor, "loadSync", loadSync);
NODE_SET_PROTOTYPE_METHOD(constructor, "fromStringSync", fromStringSync);
NODE_SET_PROTOTYPE_METHOD(constructor, "fromString", fromString);
NODE_SET_PROTOTYPE_METHOD(constructor, "save", save);
NODE_SET_PROTOTYPE_METHOD(constructor, "clear", clear);
NODE_SET_PROTOTYPE_METHOD(constructor, "toXML", to_string);
NODE_SET_PROTOTYPE_METHOD(constructor, "resize", resize);
NODE_SET_PROTOTYPE_METHOD(constructor, "render", render);
NODE_SET_PROTOTYPE_METHOD(constructor, "renderSync", renderSync);
NODE_SET_PROTOTYPE_METHOD(constructor, "renderFile", renderFile);
NODE_SET_PROTOTYPE_METHOD(constructor, "renderFileSync", renderFileSync);
NODE_SET_PROTOTYPE_METHOD(constructor, "zoomAll", zoomAll);
NODE_SET_PROTOTYPE_METHOD(constructor, "zoomToBox", zoomToBox); //setExtent
NODE_SET_PROTOTYPE_METHOD(constructor, "scaleDenominator", scaleDenominator);
NODE_SET_PROTOTYPE_METHOD(constructor, "queryPoint", queryPoint);
NODE_SET_PROTOTYPE_METHOD(constructor, "queryMapPoint", queryMapPoint);
// layer access
NODE_SET_PROTOTYPE_METHOD(constructor, "add_layer", add_layer);
NODE_SET_PROTOTYPE_METHOD(constructor, "get_layer", get_layer);
NODE_SET_PROTOTYPE_METHOD(constructor, "layers", layers);
// properties
ATTR(constructor, "srs", get_prop, set_prop);
ATTR(constructor, "width", get_prop, set_prop);
ATTR(constructor, "height", get_prop, set_prop);
ATTR(constructor, "bufferSize", get_prop, set_prop);
ATTR(constructor, "extent", get_prop, set_prop);
ATTR(constructor, "maximumExtent", get_prop, set_prop);
ATTR(constructor, "background", get_prop, set_prop);
ATTR(constructor, "parameters", get_prop, set_prop);
NODE_SET_PROTOTYPE_METHOD(constructor, "size", size);
target->Set(String::NewSymbol("Map"),constructor->GetFunction());
}
Map::Map(int width, int height) :
ObjectWrap(),
map_(boost::make_shared<mapnik::Map>(width,height)),
in_use_(0),
estimated_size_(0) {}
Map::Map(int width, int height, std::string const& srs) :
ObjectWrap(),
map_(boost::make_shared<mapnik::Map>(width,height,srs)),
in_use_(0),
estimated_size_(0) {}
Map::~Map()
{
if (estimated_size_ > 0)
{
V8::AdjustAmountOfExternalAllocatedMemory(-estimated_size_);
}
}
void Map::acquire() {
++in_use_;
}
void Map::release() {
--in_use_;
}
int Map::active() const {
return in_use_;
}
Handle<Value> Map::New(const Arguments& args)
{
HandleScope scope;
if (!args.IsConstructCall())
return ThrowException(String::New("Cannot call constructor as function, you need to use 'new' keyword"));
// accept a reference or v8:External?
if (args[0]->IsExternal())
{
return ThrowException(String::New("No support yet for passing v8:External wrapper around C++ void*"));
}
if (args.Length() == 2)
{
if (!args[0]->IsNumber() || !args[1]->IsNumber())
return ThrowException(Exception::Error(
String::New("'width' and 'height' must be a integers")));
Map* m = new Map(args[0]->IntegerValue(),args[1]->IntegerValue());
m->Wrap(args.This());
return args.This();
}
else if (args.Length() == 3)
{
if (!args[0]->IsNumber() || !args[1]->IsNumber())
return ThrowException(Exception::Error(
String::New("'width' and 'height' must be a integers")));
if (!args[2]->IsString())
return ThrowException(Exception::Error(
String::New("'srs' value must be a string")));
Map* m = new Map(args[0]->IntegerValue(),args[1]->IntegerValue(),TOSTR(args[2]));
m->Wrap(args.This());
return args.This();
}
else
{
return ThrowException(Exception::Error(
String::New("please provide Map width and height and optional srs")));
}
return Undefined();
}
class sizeof_symbolizer : public boost::static_visitor<>
{
public:
sizeof_symbolizer( int * usage):
usage_(usage),
factor_(21 /*arbitrary*/) {}
void operator () ( mapnik::point_symbolizer const& sym )
{
*usage_ += (sizeof(sym)*factor_);
}
void operator () ( mapnik::line_symbolizer const& sym )
{
*usage_ += (sizeof(sym)*factor_);
}
void operator () ( mapnik::line_pattern_symbolizer const& sym )
{
*usage_ += (sizeof(sym)*factor_);
}
void operator () ( mapnik::polygon_symbolizer const& sym )
{
*usage_ += (sizeof(sym)*factor_);
}
void operator () ( mapnik::polygon_pattern_symbolizer const& sym )
{
*usage_ += (sizeof(sym)*factor_);
}
void operator () ( mapnik::raster_symbolizer const& sym )
{
*usage_ += (sizeof(sym)*factor_);
}
void operator () ( mapnik::shield_symbolizer const& sym )
{
*usage_ += (sizeof(sym)*factor_);
}
void operator () ( mapnik::text_symbolizer const& sym )
{
*usage_ += (sizeof(sym)*factor_);
}
void operator () ( mapnik::building_symbolizer const& sym )
{
*usage_ += (sizeof(sym)*factor_);
}
void operator () ( mapnik::markers_symbolizer const& sym)
{
*usage_ += (sizeof(sym)*factor_);
}
#if MAPNIK_VERSION < 200100
void operator () ( mapnik::glyph_symbolizer const& sym)
{
*usage_ += (sizeof(sym)*factor_);
}
#endif
void operator () ( mapnik::symbolizer const& sym )
{
*usage_ += (sizeof(sym)*factor_);
}
int * usage_;
int factor_;
};
int Map::estimate_map_size()
{
// very rough estimate of memory usage of a map
int mem_usage = 0;
mapnik::Map::const_style_iterator sty_itr = map_->styles().begin();
for (; sty_itr != map_->styles().end(); ++sty_itr)
{
mapnik::feature_type_style const& style = sty_itr->second;
mapnik::rules::const_iterator rule_itr = style.get_rules().begin();
for (; rule_itr != style.get_rules().end(); ++rule_itr)
{
mapnik::rule::symbolizers::const_iterator begin = rule_itr->get_symbolizers().begin();
mapnik::rule::symbolizers::const_iterator end = rule_itr->get_symbolizers().end();
sizeof_symbolizer detector( &mem_usage);
std::for_each( begin, end , boost::apply_visitor( detector ));
}
}
estimated_size_ = mem_usage;
return mem_usage;
}
Handle<Value> Map::size(const Arguments& args)
{
HandleScope scope;
Map* m = ObjectWrap::Unwrap<Map>(args.This());
return scope.Close(Integer::New(m->estimate_map_size()));
}
Handle<Value> Map::get_prop(Local<String> property,
const AccessorInfo& info)
{
HandleScope scope;
Map* m = ObjectWrap::Unwrap<Map>(info.This());
std::string a = TOSTR(property);
if(a == "extent") {
Local<Array> a = Array::New(4);
mapnik::box2d<double> const& e = m->map_->get_current_extent();
a->Set(0, Number::New(e.minx()));
a->Set(1, Number::New(e.miny()));
a->Set(2, Number::New(e.maxx()));
a->Set(3, Number::New(e.maxy()));
return scope.Close(a);
}
else if(a == "maximumExtent") {
Local<Array> a = Array::New(4);
boost::optional<mapnik::box2d<double> > const& e = m->map_->maximum_extent();
if (!e)
return Undefined();
a->Set(0, Number::New(e->minx()));
a->Set(1, Number::New(e->miny()));
a->Set(2, Number::New(e->maxx()));
a->Set(3, Number::New(e->maxy()));
return scope.Close(a);
}
else if(a == "width")
return scope.Close(Integer::New(m->map_->width()));
else if(a == "height")
return scope.Close(Integer::New(m->map_->height()));
else if (a == "srs")
return scope.Close(String::New(m->map_->srs().c_str()));
else if(a == "bufferSize")
return scope.Close(Integer::New(m->map_->buffer_size()));
else if (a == "background") {
boost::optional<mapnik::color> c = m->map_->background();
if (c)
return scope.Close(Color::New(*c));
else
return Undefined();
}
else if (a == "parameters") {
Local<Object> ds = Object::New();
#if MAPNIK_VERSION >= 200100
mapnik::parameters const& params = m->map_->get_extra_parameters();
mapnik::parameters::const_iterator it = params.begin();
mapnik::parameters::const_iterator end = params.end();
for (; it != end; ++it)
{
node_mapnik::params_to_object serializer( ds , it->first);
boost::apply_visitor( serializer, it->second );
}
#endif
return scope.Close(ds);
}
return Undefined();
}
void Map::set_prop(Local<String> property,
Local<Value> value,
const AccessorInfo& info)
{
HandleScope scope;
Map* m = ObjectWrap::Unwrap<Map>(info.Holder());
std::string a = TOSTR(property);
if(a == "extent" || a == "maximumExtent") {
if (!value->IsArray()) {
ThrowException(Exception::Error(
String::New("Must provide an array of: [minx,miny,maxx,maxy]")));
} else {
Local<Array> arr = Local<Array>::Cast(value);
if (!arr->Length() == 4) {
ThrowException(Exception::Error(
String::New("Must provide an array of: [minx,miny,maxx,maxy]")));
} else {
double minx = arr->Get(0)->NumberValue();
double miny = arr->Get(1)->NumberValue();
double maxx = arr->Get(2)->NumberValue();
double maxy = arr->Get(3)->NumberValue();
mapnik::box2d<double> box(minx,miny,maxx,maxy);
if(a == "extent")
m->map_->zoom_to_box(box);
else
m->map_->set_maximum_extent(box);
}
}
}
else if (a == "srs")
{
if (!value->IsString()) {
ThrowException(Exception::Error(
String::New("'srs' must be a string")));
} else {
m->map_->set_srs(TOSTR(value));
}
}
else if (a == "bufferSize") {
if (!value->IsNumber()) {
ThrowException(Exception::Error(
String::New("Must provide an integer bufferSize")));
} else {
m->map_->set_buffer_size(value->IntegerValue());
}
}
else if (a == "width") {
if (!value->IsNumber()) {
ThrowException(Exception::Error(
String::New("Must provide an integer width")));
} else {
m->map_->set_width(value->IntegerValue());
}
}
else if (a == "height") {
if (!value->IsNumber()) {
ThrowException(Exception::Error(
String::New("Must provide an integer height")));
} else {
m->map_->set_height(value->IntegerValue());
}
}
else if (a == "background") {
if (!value->IsObject())
ThrowException(Exception::TypeError(
String::New("mapnik.Color expected")));
Local<Object> obj = value->ToObject();
if (obj->IsNull() || obj->IsUndefined() || !Color::constructor->HasInstance(obj))
ThrowException(Exception::TypeError(String::New("mapnik.Color expected")));
Color *c = ObjectWrap::Unwrap<Color>(obj);
m->map_->set_background(*c->get());
}
else if (a == "parameters") {
#if MAPNIK_VERSION >= 200100
if (!value->IsObject())
ThrowException(Exception::TypeError(
String::New("object expected for map.parameters")));
Local<Object> obj = value->ToObject();
if (obj->IsNull() || obj->IsUndefined())
ThrowException(Exception::TypeError(String::New("object expected for map.parameters, cannot be null/undefined")));
mapnik::parameters params;
Local<Array> names = obj->GetPropertyNames();
uint32_t i = 0;
uint32_t a_length = names->Length();
while (i < a_length) {
Local<Value> name = names->Get(i)->ToString();
Local<Value> value = obj->Get(name);
if (value->IsString()) {
params[TOSTR(name)] = TOSTR(value);
} else if (value->IsNumber()) {
double num = value->NumberValue();
// todo - round
if (num == value->IntegerValue()) {
int integer = value->IntegerValue();
params[TOSTR(name)] = integer;
} else {
double dub_val = value->NumberValue();
params[TOSTR(name)] = dub_val;
}
} else {
std::clog << "unhandled type for property: " << TOSTR(name) << "\n";
}
i++;
}
m->map_->set_extra_parameters(params);
#endif
}
}
Handle<Value> Map::scaleDenominator(const Arguments& args)
{
HandleScope scope;
Map* m = ObjectWrap::Unwrap<Map>(args.This());
return scope.Close(Number::New(m->map_->scale_denominator()));
}
typedef struct {
uv_work_t request;
Map *m;
std::map<std::string,mapnik::featureset_ptr> featuresets;
int layer_idx;
bool geo_coords;
double x;
double y;
bool error;
std::string error_name;
Persistent<Function> cb;
} query_map_baton_t;
Handle<Value> Map::queryMapPoint(const Arguments& args)
{
HandleScope scope;
abstractQueryPoint(args,false);
return Undefined();
}
Handle<Value> Map::queryPoint(const Arguments& args)
{
HandleScope scope;
abstractQueryPoint(args,true);
return Undefined();
}
Handle<Value> Map::abstractQueryPoint(const Arguments& args, bool geo_coords)
{
HandleScope scope;
if (!args.Length() >= 3)
{
return ThrowException(Exception::TypeError(
String::New("requires at least three arguments, a x,y query and a callback")));
}
double x,y;
if (!args[0]->IsNumber() || !args[1]->IsNumber())
{
return ThrowException(Exception::TypeError(
String::New("x,y arguments must be numbers")));
}
else
{
x = args[0]->NumberValue();
y = args[1]->NumberValue();
}
Map* m = ObjectWrap::Unwrap<Map>(args.This());
Local<Object> options = Object::New();
int layer_idx = -1;
if (args.Length() > 3)
{
// options object
if (!args[2]->IsObject())
return ThrowException(Exception::TypeError(
String::New("optional third argument must be an options object")));
options = args[2]->ToObject();
if (options->Has(String::New("layer")))
{
std::vector<mapnik::layer> const& layers = m->map_->layers();
Local<Value> layer_id = options->Get(String::New("layer"));
if (! (layer_id->IsString() || layer_id->IsNumber()) )
return ThrowException(Exception::TypeError(
String::New("'layer' option required for map query and must be either a layer name(string) or layer index (integer)")));
if (layer_id->IsString()) {
bool found = false;
unsigned int idx(0);
std::string const & layer_name = TOSTR(layer_id);
BOOST_FOREACH ( mapnik::layer const& lyr, layers )
{
if (lyr.name() == layer_name)
{
found = true;
layer_idx = idx;
break;
}
++idx;
}
if (!found)
{
std::ostringstream s;
s << "Layer name '" << layer_name << "' not found";
return ThrowException(Exception::TypeError(String::New(s.str().c_str())));
}
}
else if (layer_id->IsNumber())
{
layer_idx = layer_id->IntegerValue();
std::size_t layer_num = layers.size();
if (layer_idx < 0) {
std::ostringstream s;
s << "Zero-based layer index '" << layer_idx << "' not valid"
<< " must be a positive integer";
if (layer_num > 0)
{
s << "only '" << layers.size() << "' layers exist in map";
}
else
{
s << "no layers found in map";
}
return ThrowException(Exception::TypeError(String::New(s.str().c_str())));
} else if (layer_idx >= static_cast<int>(layer_num)) {
std::ostringstream s;
s << "Zero-based layer index '" << layer_idx << "' not valid, ";
if (layer_num > 0)
{
s << "only '" << layers.size() << "' layers exist in map";
}
else
{
s << "no layers found in map";
}
return ThrowException(Exception::TypeError(String::New(s.str().c_str())));
}
} else {
return ThrowException(Exception::TypeError(String::New("layer id must be a string or index number")));
}
}
}
// ensure function callback
Local<Value> callback = args[args.Length()-1];
if (!callback->IsFunction())
return ThrowException(Exception::TypeError(
String::New("last argument must be a callback function")));
query_map_baton_t *closure = new query_map_baton_t();
closure->request.data = closure;
closure->m = m;
closure->x = x;
closure->y = y;
closure->layer_idx = static_cast<std::size_t>(layer_idx);
closure->geo_coords = geo_coords;
closure->error = false;
closure->cb = Persistent<Function>::New(Handle<Function>::Cast(callback));
uv_queue_work(uv_default_loop(), &closure->request, EIO_QueryMap, EIO_AfterQueryMap);
m->Ref();
return Undefined();
}
void Map::EIO_QueryMap(uv_work_t* req)
{
query_map_baton_t *closure = static_cast<query_map_baton_t *>(req->data);
try
{
std::vector<mapnik::layer> const& layers = closure->m->map_->layers();
if (closure->layer_idx >= 0)
{
mapnik::featureset_ptr fs;
if (closure->geo_coords)
{
fs = closure->m->map_->query_point(closure->layer_idx,
closure->x,
closure->y);
}
else
{
fs = closure->m->map_->query_map_point(closure->layer_idx,
closure->x,
closure->y);
}
mapnik::layer const& lyr = layers[closure->layer_idx];
closure->featuresets.insert(std::make_pair(lyr.name(),fs));
}
else
{
// query all layers
unsigned idx = 0;
BOOST_FOREACH ( mapnik::layer const& lyr, layers )
{
mapnik::featureset_ptr fs;
if (closure->geo_coords)
{
fs = closure->m->map_->query_point(idx,
closure->x,
closure->y);
}
else
{
fs = closure->m->map_->query_map_point(idx,
closure->x,
closure->y);
}
closure->featuresets.insert(std::make_pair(lyr.name(),fs));
++idx;
}
}
}
catch (std::exception const& ex)
{
closure->error = true;
closure->error_name = ex.what();
}
catch (...)
{
closure->error = true;
closure->error_name = "unknown exception happened while rendering the map,\n this should not happen, please submit a bug report";
}
}
void Map::EIO_AfterQueryMap(uv_work_t* req)
{
HandleScope scope;
query_map_baton_t *closure = static_cast<query_map_baton_t *>(req->data);
TryCatch try_catch;
if (closure->error) {
Local<Value> argv[1] = { Exception::Error(String::New(closure->error_name.c_str())) };
closure->cb->Call(Context::GetCurrent()->Global(), 1, argv);
} else {
std::size_t num_result = closure->featuresets.size();
if (num_result >= 1)
{
Local<Array> a = Array::New(num_result);
typedef std::map<std::string,mapnik::featureset_ptr> fs_itr;
fs_itr::const_iterator it = closure->featuresets.begin();
fs_itr::const_iterator end = closure->featuresets.end();
unsigned idx = 0;
for (; it != end; ++it)
{
Local<Object> obj = Object::New();
obj->Set(String::NewSymbol("layer"), String::New(it->first.c_str()));
obj->Set(String::NewSymbol("featureset"), Featureset::New(it->second));
a->Set(idx, obj);
++idx;
}
closure->featuresets.clear();
Local<Value> argv[2] = { Local<Value>::New(Null()), a };
closure->cb->Call(Context::GetCurrent()->Global(), 2, argv);
}
else
{
Local<Value> argv[2] = { Local<Value>::New(Null()),
Local<Value>::New(Undefined()) };
closure->cb->Call(Context::GetCurrent()->Global(), 2, argv);
}
}
if (try_catch.HasCaught()) {
FatalException(try_catch);
}
closure->m->Unref();
closure->cb.Dispose();
delete closure;
}
Handle<Value> Map::layers(const Arguments& args)
{
HandleScope scope;
Map* m = ObjectWrap::Unwrap<Map>(args.This());
std::vector<mapnik::layer> const& layers = m->map_->layers();
Local<Array> a = Array::New(layers.size());
for (unsigned i = 0; i < layers.size(); ++i )
{
a->Set(i, Layer::New(layers[i]));
}
return scope.Close(a);
}
Handle<Value> Map::add_layer(const Arguments &args) {
HandleScope scope;
if (!args[0]->IsObject())
return ThrowException(Exception::TypeError(
String::New("mapnik.Layer expected")));
Local<Object> obj = args[0]->ToObject();
if (obj->IsNull() || obj->IsUndefined() || !Layer::constructor->HasInstance(obj))
return ThrowException(Exception::TypeError(String::New("mapnik.Layer expected")));
Layer *l = ObjectWrap::Unwrap<Layer>(obj);
Map* m = ObjectWrap::Unwrap<Map>(args.This());
// TODO - addLayer should be add_layer in mapnik
m->map_->addLayer(*l->get());
return Undefined();
}
Handle<Value> Map::get_layer(const Arguments& args)
{
HandleScope scope;
if (!args.Length() == 1)
return ThrowException(Exception::Error(
String::New("Please provide layer name or index")));
Map* m = ObjectWrap::Unwrap<Map>(args.This());
std::vector<mapnik::layer> const& layers = m->map_->layers();
Local<Value> layer = args[0];
if (layer->IsNumber())
{
unsigned int index = args[0]->IntegerValue();
if (index < layers.size())
{
return scope.Close(Layer::New(layers[index]));
}
else
{
return ThrowException(Exception::TypeError(
String::New("invalid layer index")));
}
}
else if (layer->IsString())
{
bool found = false;
unsigned int idx(0);
std::string const & layer_name = TOSTR(layer);
BOOST_FOREACH ( mapnik::layer const& lyr, layers )
{
if (lyr.name() == layer_name)
{
found = true;
return scope.Close(Layer::New(layers[idx]));
}
++idx;
}
if (!found)
{
std::ostringstream s;
s << "Layer name '" << layer_name << "' not found";
return ThrowException(Exception::TypeError(
String::New(s.str().c_str())));
}
}
else
{
return ThrowException(Exception::TypeError(
String::New("first argument must be either a layer name(string) or layer index (integer)")));
}
return Undefined();
}
Handle<Value> Map::clear(const Arguments& args)
{
HandleScope scope;
Map* m = ObjectWrap::Unwrap<Map>(args.This());
m->map_->remove_all();
return Undefined();
}
Handle<Value> Map::resize(const Arguments& args)
{
HandleScope scope;
if (!args.Length() == 2)
return ThrowException(Exception::Error(
String::New("Please provide width and height")));
if (!args[0]->IsNumber() || !args[1]->IsNumber())
return ThrowException(Exception::TypeError(
String::New("width and height must be integers")));
Map* m = ObjectWrap::Unwrap<Map>(args.This());
m->map_->resize(args[0]->IntegerValue(),args[1]->IntegerValue());
return Undefined();
}
typedef struct {
uv_work_t request;
Map *m;
std::string stylesheet;
bool strict;
bool error;
std::string error_name;
Persistent<Function> cb;
} load_image_baton_t;
Handle<Value> Map::load(const Arguments& args)
{
HandleScope scope;
if (!args.Length() >= 2)
return ThrowException(Exception::Error(
String::New("please provide a stylesheet path, options, and callback")));
// ensure stylesheet path is a string
Local<Value> stylesheet = args[0];
if (!stylesheet->IsString())
return ThrowException(Exception::TypeError(
String::New("first argument must be a path to a mapnik stylesheet")));
// ensure callback is a function
Local<Value> callback = args[args.Length()-1];
if (!callback->IsFunction())
return ThrowException(Exception::TypeError(
String::New("last argument must be a callback function")));
// ensure options object
if (!args[1]->IsObject())
return ThrowException(Exception::TypeError(
String::New("options must be an object, eg {strict: true}")));
Local<Object> options = args[1]->ToObject();
bool strict = false;
Local<String> param = String::New("strict");
if (options->Has(param))
{
Local<Value> param_val = options->Get(param);
if (!param_val->IsBoolean())
return ThrowException(Exception::TypeError(
String::New("'strict' must be a Boolean")));
strict = param_val->BooleanValue();
}
Map* m = ObjectWrap::Unwrap<Map>(args.This());
load_image_baton_t *closure = new load_image_baton_t();
closure->request.data = closure;
closure->stylesheet = TOSTR(stylesheet);
closure->m = m;
closure->strict = strict;
closure->error = false;
closure->cb = Persistent<Function>::New(Handle<Function>::Cast(callback));
uv_queue_work(uv_default_loop(), &closure->request, EIO_Load, EIO_AfterLoad);
m->Ref();
return Undefined();
}
void Map::EIO_Load(uv_work_t* req)
{
load_image_baton_t *closure = static_cast<load_image_baton_t *>(req->data);
try
{
mapnik::load_map(*closure->m->map_,closure->stylesheet,closure->strict);
}
catch (std::exception const& ex)
{
closure->error = true;
closure->error_name = ex.what();
}
catch (...)
{
closure->error = true;
closure->error_name = "unknown exception happened while rendering the map,\n this should not happen, please submit a bug report";
}
}
void Map::EIO_AfterLoad(uv_work_t* req)
{
HandleScope scope;
load_image_baton_t *closure = static_cast<load_image_baton_t *>(req->data);
TryCatch try_catch;
if (closure->error) {
Local<Value> argv[1] = { Exception::Error(String::New(closure->error_name.c_str())) };
closure->cb->Call(Context::GetCurrent()->Global(), 1, argv);
} else {
Local<Value> argv[2] = { Local<Value>::New(Null()), Local<Value>::New(closure->m->handle_) };
closure->cb->Call(Context::GetCurrent()->Global(), 2, argv);
V8::AdjustAmountOfExternalAllocatedMemory(closure->m->estimate_map_size());
}
if (try_catch.HasCaught()) {
FatalException(try_catch);
}
closure->m->Unref();
closure->cb.Dispose();
delete closure;
}
Handle<Value> Map::loadSync(const Arguments& args)
{
HandleScope scope;
if (!args[0]->IsString())
return ThrowException(Exception::TypeError(
String::New("first argument must be a path to a mapnik stylesheet")));
Map* m = ObjectWrap::Unwrap<Map>(args.This());
std::string stylesheet = TOSTR(args[0]);
bool strict = false;
if (args.Length() > 2)
{
return ThrowException(Exception::TypeError(
String::New("only accepts two arguments: a path to a mapnik stylesheet and an optional options object")));
}
else if (args.Length() == 2)
{
// ensure options object
if (!args[1]->IsObject())
return ThrowException(Exception::TypeError(
String::New("options must be an object, eg {strict: true}")));
Local<Object> options = args[1]->ToObject();
Local<String> param = String::New("strict");
if (options->Has(param))
{
Local<Value> param_val = options->Get(param);
if (!param_val->IsBoolean())
return ThrowException(Exception::TypeError(
String::New("'strict' must be a Boolean")));
strict = param_val->BooleanValue();
}
}
try
{
mapnik::load_map(*m->map_,stylesheet,strict);
}
catch (std::exception const& ex)
{
return ThrowException(Exception::Error(
String::New(ex.what())));
}
catch (...)
{
return ThrowException(Exception::TypeError(
String::New("something went wrong loading the map")));
}
V8::AdjustAmountOfExternalAllocatedMemory(m->estimate_map_size());
return Undefined();
}
Handle<Value> Map::fromStringSync(const Arguments& args)
{
HandleScope scope;
if (!args.Length() >= 1) {
return ThrowException(Exception::TypeError(
String::New("Accepts 2 arguments: stylesheet string and an optional options")));
}