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mapnik_map.cpp
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949 lines (872 loc) · 29.2 KB
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#include "mapnik_map.hpp"
#include "utils.hpp"
#include "mapnik_color.hpp" // for Color, Color::constructor
#include "mapnik_image.hpp" // for Image, Image::constructor
#include "mapnik_layer.hpp" // for Layer, Layer::constructor
#include "mapnik_palette.hpp" // for palette_ptr, Palette, etc
// mapnik
#include <mapnik/map.hpp>
#include <mapnik/layer.hpp> // for layer
#include <mapnik/save_map.hpp> // for save_map, etc
// stl
#include <sstream> // for basic_ostringstream, etc
#include <cmath>
#include <limits>
Napi::FunctionReference Map::constructor;
Napi::Object Map::Initialize(Napi::Env env, Napi::Object exports, napi_property_attributes prop_attr)
{
// clang-format off
Napi::Function func = DefineClass(env, "Map", {
InstanceMethod<&Map::fonts>("fonts", prop_attr),
InstanceMethod<&Map::fontFiles>("fontFiles", prop_attr),
InstanceMethod<&Map::fontDirectory>("fontDirectory", prop_attr),
InstanceMethod<&Map::memoryFonts>("memoryFonts", prop_attr),
InstanceMethod<&Map::registerFonts>("registerFonts", prop_attr),
InstanceMethod<&Map::loadFonts>("loadFonts", prop_attr),
InstanceMethod<&Map::load>("load", prop_attr),
InstanceMethod<&Map::loadSync>("loadSync", prop_attr),
InstanceMethod<&Map::fromStringSync>("fromStringSync", prop_attr),
InstanceMethod<&Map::fromString>("fromString", prop_attr),
InstanceMethod<&Map::clone>("clone", prop_attr),
InstanceMethod<&Map::save>("save", prop_attr),
InstanceMethod<&Map::clear>("clear", prop_attr),
InstanceMethod<&Map::toXML>("toXML", prop_attr),
InstanceMethod<&Map::resize>("resize", prop_attr),
InstanceMethod<&Map::render>("render", prop_attr),
InstanceMethod<&Map::renderSync>("renderSync", prop_attr),
InstanceMethod<&Map::renderFile>("renderFile", prop_attr),
InstanceMethod<&Map::renderFileSync>("renderFileSync", prop_attr),
InstanceMethod<&Map::zoomAll>("zoomAll", prop_attr),
InstanceMethod<&Map::zoomToBox>("zoomToBox", prop_attr),
InstanceMethod<&Map::scale>("scale", prop_attr),
InstanceMethod<&Map::scaleDenominator>("scaleDenominator", prop_attr),
InstanceMethod<&Map::queryPoint>("queryPoint", prop_attr),
InstanceMethod<&Map::queryMapPoint>("queryMapPoint", prop_attr),
InstanceMethod<&Map::add_layer>("add_layer", prop_attr),
InstanceMethod<&Map::remove_layer>("remove_layer", prop_attr),
InstanceMethod<&Map::get_layer>("get_layer", prop_attr),
InstanceMethod<&Map::layers>("layers", prop_attr),
// accessors
InstanceAccessor<&Map::srs, &Map::srs>("srs", prop_attr),
InstanceAccessor<&Map::width, &Map::width>("width", prop_attr),
InstanceAccessor<&Map::height, &Map::height>("height", prop_attr),
InstanceAccessor<&Map::bufferSize, &Map::bufferSize>("bufferSize", prop_attr),
InstanceAccessor<&Map::extent, &Map::extent>("extent", prop_attr),
InstanceAccessor<&Map::bufferedExtent>("bufferedExtent", prop_attr),
InstanceAccessor<&Map::maximumExtent, &Map::maximumExtent>("maximumExtent", prop_attr),
InstanceAccessor<&Map::background, &Map::background>("background", prop_attr),
InstanceAccessor<&Map::parameters, &Map::parameters>("parameters", prop_attr),
InstanceAccessor<&Map::aspect_fix_mode, &Map::aspect_fix_mode>("aspect_fix_mode", prop_attr)
});
// clang-format on
func.Set("ASPECT_GROW_BBOX", Napi::Number::New(env, mapnik::Map::GROW_BBOX));
func.Set("ASPECT_GROW_CANVAS", Napi::Number::New(env, mapnik::Map::GROW_CANVAS));
func.Set("ASPECT_SHRINK_BBOX", Napi::Number::New(env, mapnik::Map::SHRINK_BBOX));
func.Set("ASPECT_SHRINK_CANVAS", Napi::Number::New(env, mapnik::Map::SHRINK_CANVAS));
func.Set("ASPECT_ADJUST_BBOX_WIDTH", Napi::Number::New(env, mapnik::Map::ADJUST_BBOX_WIDTH));
func.Set("ASPECT_ADJUST_BBOX_HEIGHT", Napi::Number::New(env, mapnik::Map::ADJUST_BBOX_HEIGHT));
func.Set("ASPECT_ADJUST_CANVAS_WIDTH", Napi::Number::New(env, mapnik::Map::ADJUST_CANVAS_WIDTH));
func.Set("ASPECT_ADJUST_CANVAS_HEIGHT", Napi::Number::New(env, mapnik::Map::ADJUST_CANVAS_HEIGHT));
func.Set("ASPECT_RESPECT", Napi::Number::New(env, mapnik::Map::RESPECT));
constructor = Napi::Persistent(func);
constructor.SuppressDestruct();
exports.Set("Map", func);
return exports;
}
/**
* **`mapnik.Map`**
*
* A map in mapnik is an object that combines data sources and styles in
* a way that lets you produce styled cartographic output.
*
* @class Map
* @param {int} width in pixels
* @param {int} height in pixels
* @param {string} [projection='+proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs'] projection as a proj4 code
* typically used with 'epsg:3857'
* @property {string} src
* @property {number} width
* @property {number} height
* @property {number} bufferSize
* @property {Array<number>} extent - extent of the map as an array `[ minx, miny, maxx, maxy ]`
* @property {Array<number>} bufferedExtent - extent of the map's buffer `[ minx, miny, maxx, maxy ]`
* @property {Array<number>} maximumExtent - combination of extent and bufferedExtent `[ minx, miny, maxx, maxy ]`
* @property {mapnik.Color} background - background color as a {@link mapnik.Color} object
* @property {} parameters
* @property {} aspect_fix_mode
* @example
* var map = new mapnik.Map(600, 400, 'epsg:3857');
* console.log(map);
* // {
* // aspect_fix_mode: 0,
* // parameters: {},
* // background: undefined,
* // maximumExtent: undefined,
* // bufferedExtent: [ NaN, NaN, NaN, NaN ],
* // extent:
* // [ 1.7976931348623157e+308,
* // 1.7976931348623157e+308,
* // -1.7976931348623157e+308,
* // -1.7976931348623157e+308 ],
* // bufferSize: 0,
* // height: 400,
* // width: 600,
* // srs: 'epsg:3857'
* // }
*/
Map::Map(Napi::CallbackInfo const& info)
: Napi::ObjectWrap<Map>(info)
{
Napi::Env env = info.Env();
if (info.Length() == 1 && info[0].IsExternal())
{
auto ext = info[0].As<Napi::External<map_ptr>>();
if (ext) map_ = *ext.Data();
return;
}
if (info.Length() > 1 && info.Length() < 4 )
{
if (info[0].IsNumber() && info[1].IsNumber())
{
std::int32_t width = info[0].As<Napi::Number>().Int32Value();
std::int32_t height = info[1].As<Napi::Number>().Int32Value();
if (width > 0 && width <= std::numeric_limits<std::int32_t>::max()
&& height > 0 && height <= std::numeric_limits<std::int32_t>::max())
{
if (info.Length() == 3)
{
if (!info[2].IsString())
{
Napi::Error::New(env, "'srs' value must be a string").ThrowAsJavaScriptException();
return;
}
map_ = std::make_shared<mapnik::Map>(width, height, info[2].As<Napi::String>());
}
else
{
map_ = std::make_shared<mapnik::Map>(width, height);
}
}
else
{
Napi::TypeError::New(env, "'width' and 'height' must be positive finite numbers").ThrowAsJavaScriptException();
return;
}
}
else
{
Napi::TypeError::New(env, "'width' and 'height' must positive finite numbers").ThrowAsJavaScriptException();
return;
}
}
else
{
Napi::Error::New(env, "please provide Map width, height and optional srs").ThrowAsJavaScriptException();
}
}
// accessors
// srs
Napi::Value Map::srs(Napi::CallbackInfo const& info)
{
Napi::Env env = info.Env();
return Napi::String::New(env, map_->srs());
}
void Map::srs(Napi::CallbackInfo const& info, Napi::Value const& value)
{
Napi::Env env = info.Env();
if (!value.IsString())
{
Napi::TypeError::New(env, "'srs' must be a string").ThrowAsJavaScriptException();
return;
}
map_->set_srs(value.As<Napi::String>());
}
// extent
Napi::Value Map::extent(Napi::CallbackInfo const& info)
{
Napi::Env env = info.Env();
Napi::EscapableHandleScope scope(env);
mapnik::box2d<double> const& e = map_->get_current_extent();
Napi::Array arr = Napi::Array::New(env, 4u);
arr.Set(0u, Napi::Number::New(env, e.minx()));
arr.Set(1u, Napi::Number::New(env, e.miny()));
arr.Set(2u, Napi::Number::New(env, e.maxx()));
arr.Set(3u, Napi::Number::New(env, e.maxy()));
return scope.Escape(arr);
}
void Map::extent(Napi::CallbackInfo const& info, Napi::Value const& value)
{
Napi::Env env = info.Env();
if (!value.IsArray())
{
Napi::Error::New(env, "Must provide an array of: [minx,miny,maxx,maxy]").ThrowAsJavaScriptException();
return;
}
Napi::Array arr = value.As<Napi::Array>();
double minx = arr.Get(0u).As<Napi::Number>().DoubleValue();
double miny = arr.Get(1u).As<Napi::Number>().DoubleValue();
double maxx = arr.Get(2u).As<Napi::Number>().DoubleValue();
double maxy = arr.Get(3u).As<Napi::Number>().DoubleValue();
mapnik::box2d<double> box{minx, miny, maxx, maxy};
map_->zoom_to_box(box);
}
// maximumExtent
Napi::Value Map::maximumExtent(Napi::CallbackInfo const& info)
{
Napi::Env env = info.Env();
Napi::EscapableHandleScope scope(env);
auto const& e = map_->maximum_extent();
if (!e) return env.Undefined();
Napi::Array arr = Napi::Array::New(env, 4u);
arr.Set(0u, Napi::Number::New(env, e->minx()));
arr.Set(1u, Napi::Number::New(env, e->miny()));
arr.Set(2u, Napi::Number::New(env, e->maxx()));
arr.Set(3u, Napi::Number::New(env, e->maxy()));
return scope.Escape(arr);
}
void Map::maximumExtent(Napi::CallbackInfo const& info, Napi::Value const& value)
{
Napi::Env env = info.Env();
if (!value.IsArray())
{
Napi::Error::New(env, "Must provide an array of: [minx,miny,maxx,maxy]").ThrowAsJavaScriptException();
return;
}
Napi::Array arr = value.As<Napi::Array>();
double minx = arr.Get(0u).As<Napi::Number>().DoubleValue();
double miny = arr.Get(1u).As<Napi::Number>().DoubleValue();
double maxx = arr.Get(2u).As<Napi::Number>().DoubleValue();
double maxy = arr.Get(3u).As<Napi::Number>().DoubleValue();
mapnik::box2d<double> box{minx, miny, maxx, maxy};
map_->set_maximum_extent(box);
}
// bufferedExtent
Napi::Value Map::bufferedExtent(Napi::CallbackInfo const& info)
{
Napi::Env env = info.Env();
Napi::EscapableHandleScope scope(env);
auto e = map_->get_buffered_extent();
Napi::Array arr = Napi::Array::New(env, 4u);
arr.Set(0u, Napi::Number::New(env, e.minx()));
arr.Set(1u, Napi::Number::New(env, e.miny()));
arr.Set(2u, Napi::Number::New(env, e.maxx()));
arr.Set(3u, Napi::Number::New(env, e.maxy()));
return scope.Escape(arr);
}
// width
Napi::Value Map::width(Napi::CallbackInfo const& info)
{
Napi::Env env = info.Env();
return Napi::Number::New(env, map_->width());
}
void Map::width(Napi::CallbackInfo const& info, Napi::Value const& value)
{
Napi::Env env = info.Env();
if (!value.IsNumber())
{
Napi::TypeError::New(env, "Must provide an integer width").ThrowAsJavaScriptException();
return;
}
map_->set_width(value.As<Napi::Number>().Int32Value());
}
// height
Napi::Value Map::height(Napi::CallbackInfo const& info)
{
Napi::Env env = info.Env();
return Napi::Number::New(env, map_->height());
}
void Map::height(Napi::CallbackInfo const& info, Napi::Value const& value)
{
Napi::Env env = info.Env();
if (!value.IsNumber())
{
Napi::TypeError::New(env, "Must provide an integer height").ThrowAsJavaScriptException();
return;
}
map_->set_height(value.As<Napi::Number>().Int32Value());
}
// aspect_fix_mode
Napi::Value Map::aspect_fix_mode(Napi::CallbackInfo const& info)
{
Napi::Env env = info.Env();
return Napi::Number::New(env, map_->get_aspect_fix_mode());
}
void Map::aspect_fix_mode(Napi::CallbackInfo const& info, Napi::Value const& value)
{
Napi::Env env = info.Env();
if (!value.IsNumber())
{
Napi::TypeError::New(env, "'aspect_fix_mode' must be a constant (number)").ThrowAsJavaScriptException();
return;
}
int val = value.As<Napi::Number>().Int32Value();
if (val < mapnik::Map::aspect_fix_mode_MAX && val >= 0)
{
map_->set_aspect_fix_mode(static_cast<mapnik::Map::aspect_fix_mode>(val));
}
else
{
Napi::Error::New(env, "'aspect_fix_mode' value is invalid").ThrowAsJavaScriptException();
}
}
// bufferSize
Napi::Value Map::bufferSize(Napi::CallbackInfo const& info)
{
Napi::Env env = info.Env();
return Napi::Number::New(env, map_->buffer_size());
}
void Map::bufferSize(Napi::CallbackInfo const& info, Napi::Value const& value)
{
Napi::Env env = info.Env();
if (!value.IsNumber())
{
Napi::TypeError::New(env, "Must provide an integer bufferSize").ThrowAsJavaScriptException();
return;
}
map_->set_buffer_size(value.As<Napi::Number>().Int32Value());
}
// background
Napi::Value Map::background(Napi::CallbackInfo const& info)
{
Napi::Env env = info.Env();
Napi::EscapableHandleScope scope(env);
auto col = map_->background();
if (col)
{
Napi::Value arg = Napi::External<mapnik::color>::New(env, &(*col));
Napi::Object obj = Color::constructor.New({arg});
return scope.Escape(obj);
}
return env.Undefined();
}
void Map::background(Napi::CallbackInfo const& info, Napi::Value const& value)
{
Napi::Env env = info.Env();
if (!value.IsObject())
{
Napi::TypeError::New(env, "mapnik.Color expected").ThrowAsJavaScriptException();
return;
}
Napi::Object obj = value.As<Napi::Object>();
if (!obj.InstanceOf(Color::constructor.Value()))
{
Napi::TypeError::New(env, "Must provide an integer height").ThrowAsJavaScriptException();
return;
}
Color* c = Napi::ObjectWrap<Color>::Unwrap(obj);
map_->set_background(c->color_);
}
// parameters
Napi::Value Map::parameters(Napi::CallbackInfo const& info)
{
Napi::Env env = info.Env();
Napi::EscapableHandleScope scope(env);
Napi::Object obj = Napi::Object::New(env);
mapnik::parameters const& params = map_->get_extra_parameters();
for (auto const& p : params)
{
node_mapnik::params_to_object(env, obj, p.first, p.second);
}
return scope.Escape(obj);
}
void Map::parameters(Napi::CallbackInfo const& info, Napi::Value const& value)
{
Napi::Env env = info.Env();
if (!value.IsObject())
{
Napi::TypeError::New(env, "object expected for map.parameters").ThrowAsJavaScriptException();
return;
}
mapnik::parameters params;
Napi::Object obj = value.As<Napi::Object>();
Napi::Array names = obj.GetPropertyNames();
std::size_t length = names.Length();
for (std::size_t index = 0; index < length; ++index)
{
std::string name = names.Get(index).ToString();
Napi::Value val = obj.Get(name);
if (val.IsString())
{
params[name] = val.As<Napi::String>().Utf8Value();
}
else if (val.IsNumber())
{
double num = val.As<Napi::Number>().DoubleValue();
// todo - round
if (num == val.As<Napi::Number>().Int32Value())
{
params[name] = static_cast<node_mapnik::value_integer>(num);
}
else
{
params[name] = num;
}
}
else if (val.IsBoolean())
{
params[name] = val.As<Napi::Boolean>().Value();
}
}
map_->set_extra_parameters(params);
}
/**
* Load fonts from local or external source
*
* @name loadFonts
* @memberof Map
* @instance
*
*/
Napi::Value Map::loadFonts(Napi::CallbackInfo const& info)
{
return Napi::Boolean::New(info.Env(), map_->load_fonts());
}
Napi::Value Map::memoryFonts(Napi::CallbackInfo const& info)
{
Napi::Env env = info.Env();
Napi::EscapableHandleScope scope(env);
auto const& font_cache = map_->get_font_memory_cache();
Napi::Array arr = Napi::Array::New(env, font_cache.size());
std::size_t index = 0u;
for (auto const& kv : font_cache)
{
arr.Set(index++, kv.first);
}
return scope.Escape(arr);
}
Napi::Value Map::registerFonts(Napi::CallbackInfo const& info)
{
Napi::Env env = info.Env();
if (info.Length() == 0 || !info[0].IsString())
{
Napi::TypeError::New(env, "first argument must be a path to a directory of fonts")
.ThrowAsJavaScriptException();
return env.Undefined();
}
bool recurse = false;
if (info.Length() >= 2)
{
if (!info[1].IsObject())
{
Napi::TypeError::New(env, "second argument is optional, but if provided must be an object, eg. { recurse: true }")
.ThrowAsJavaScriptException();
return env.Undefined();
}
Napi::Object options = info[1].As<Napi::Object>();
if (options.Has("recurse"))
{
Napi::Value recurse_opt = options.Get("recurse");
if (!recurse_opt.IsBoolean())
{
Napi::TypeError::New(env, "'recurse' must be a Boolean").ThrowAsJavaScriptException();
return env.Undefined();
}
recurse = recurse_opt.As<Napi::Boolean>();
}
}
std::string path = info[0].As<Napi::String>();
return Napi::Boolean::New(env, map_->register_fonts(path, recurse));
}
/**
* Get all of the fonts currently registered as part of this map
* @memberof Map
* @instance
* @name font
* @returns {Array<string>} fonts
*/
Napi::Value Map::fonts(Napi::CallbackInfo const& info)
{
Napi::Env env = info.Env();
Napi::EscapableHandleScope scope(env);
auto const& mapping = map_->get_font_file_mapping();
Napi::Array arr = Napi::Array::New(env, mapping.size());
std::size_t index = 0u;
for (auto const& kv : mapping)
{
arr.Set(index++, kv.first);
}
return scope.Escape(arr);
}
/**
* Get all of the fonts currently registered as part of this map, as a mapping
* from font to font file
* @memberof Map
* @instance
* @name fontFiles
* @returns {Object} fonts
*/
Napi::Value Map::fontFiles(Napi::CallbackInfo const& info)
{
Napi::Env env = info.Env();
Napi::EscapableHandleScope scope(env);
auto const& mapping = map_->get_font_file_mapping();
Napi::Object obj = Napi::Object::New(env);
for (auto const& kv : mapping)
{
obj.Set(kv.first, kv.second.second);
}
return scope.Escape(obj);
}
/**
* Get the currently-registered font directory, if any
* @memberof Map
* @instance
* @name fontDirectory
* @returns {string|undefined} fonts
*/
Napi::Value Map::fontDirectory(Napi::CallbackInfo const& info)
{
Napi::Env env = info.Env();
auto font_dir = map_->font_directory();
if (font_dir)
{
return Napi::String::New(env, *font_dir);
}
return env.Undefined();
}
/**
* Get the map's scale factor. This is the ratio between pixels and geographical
* units like meters.
* @memberof Map
* @instance
* @name scale
* @returns {number} scale
*/
Napi::Value Map::scale(Napi::CallbackInfo const& info)
{
return Napi::Number::New(info.Env(), map_->scale());
}
/**
* Get the map's scale denominator.
*
* @memberof Map
* @instance
* @name scaleDenominator
* @returns {number} scale denominator
*/
Napi::Value Map::scaleDenominator(Napi::CallbackInfo const& info)
{
return Napi::Number::New(info.Env(), map_->scale_denominator());
}
/**
* Get all of the currently-added layers in this map
*
* @memberof Map
* @instance
* @name layers
* @returns {Array<mapnik.Layer>} layers
*/
Napi::Value Map::layers(Napi::CallbackInfo const& info)
{
Napi::Env env = info.Env();
Napi::EscapableHandleScope scope(env);
std::vector<mapnik::layer> const& layers = map_->layers();
std::size_t size = layers.size();
Napi::Array arr = Napi::Array::New(env, size);
for (std::size_t index = 0; index < size; ++index)
{
auto layer = std::make_shared<mapnik::layer>(layers[index]);
Napi::Value arg = Napi::External<layer_ptr>::New(env, &layer);
Napi::Object obj = Layer::constructor.New({arg});
arr.Set(index, obj);
}
return scope.Escape(arr);
}
/**
* Add a new layer to this map
*
* @memberof Map
* @instance
* @name add_layer
* @param {mapnik.Layer} new layer
*/
Napi::Value Map::add_layer(Napi::CallbackInfo const& info)
{
Napi::Env env = info.Env();
if (!info[0].IsObject())
{
Napi::TypeError::New(env, "mapnik.Layer expected").ThrowAsJavaScriptException();
return env.Undefined();
}
Napi::Object obj = info[0].As<Napi::Object>();
if (!obj.InstanceOf(Layer::constructor.Value()))
{
Napi::TypeError::New(env, "mapnik.Layer expected").ThrowAsJavaScriptException();
return env.Undefined();
}
Layer* layer = Napi::ObjectWrap<Layer>::Unwrap(obj);
map_->add_layer(*layer->impl());
return Napi::Boolean::New(env, true);
}
/**
* Remove layer from this map
*
* @memberof Map
* @instance
* @name remove_layer
* @param {number} layer index
*/
Napi::Value Map::remove_layer(Napi::CallbackInfo const& info)
{
Napi::Env env = info.Env();
if (info.Length() != 1)
{
Napi::Error::New(env, "Please provide layer index").ThrowAsJavaScriptException();
return env.Undefined();
}
if (!info[0].IsNumber())
{
Napi::TypeError::New(env, "index must be number").ThrowAsJavaScriptException();
return env.Undefined();
}
std::vector<mapnik::layer> const& layers = map_->layers();
unsigned int index = info[0].As<Napi::Number>().Int32Value();
if (index < layers.size())
{
map_->remove_layer(index);
return Napi::Boolean::New(env, true);
}
Napi::TypeError::New(env, "invalid layer index").ThrowAsJavaScriptException();
return env.Undefined();
}
/**
* Get a layer out of this map, given a name or index
*
* @memberof Map
* @instance
* @name get_layer
* @param {string|number} layer name or index
* @returns {mapnik.Layer} the layer
* @throws {Error} if index is incorrect or layer is not found
*/
Napi::Value Map::get_layer(Napi::CallbackInfo const& info)
{
Napi::Env env = info.Env();
Napi::EscapableHandleScope scope(env);
if (info.Length() != 1)
{
Napi::Error::New(env, "Please provide layer name or index").ThrowAsJavaScriptException();
return env.Undefined();
}
std::vector<mapnik::layer> const& layers = map_->layers();
Napi::Value key = info[0];
if (key.IsNumber())
{
unsigned int index = key.As<Napi::Number>().Int32Value();
if (index < layers.size())
{
auto layer = std::make_shared<mapnik::layer>(layers[index]);
Napi::Value arg = Napi::External<layer_ptr>::New(env, &layer);
Napi::Object obj = Layer::constructor.New({arg});
return scope.Escape(obj);
}
else
{
Napi::TypeError::New(env, "invalid layer index").ThrowAsJavaScriptException();
return env.Undefined();
}
}
else if (key.IsString())
{
std::string layer_name = key.As<Napi::String>();
std::size_t index = 0;
for (mapnik::layer const& lyr : layers)
{
if (lyr.name() == layer_name)
{
auto layer = std::make_shared<mapnik::layer>(layers[index]);
Napi::Value arg = Napi::External<layer_ptr>::New(env, &layer);
Napi::Object obj = Layer::constructor.New({arg});
return scope.Escape(obj);
}
++index;
}
std::ostringstream s;
s << "Layer name '" << layer_name << "' not found";
Napi::TypeError::New(env, s.str()).ThrowAsJavaScriptException();
return env.Undefined();
}
Napi::TypeError::New(env, "first argument must be either a layer name(string) or layer index (integer)")
.ThrowAsJavaScriptException();
return env.Undefined();
}
/**
* Remove all layers and styles from this map
*
* @memberof Map
* @instance
* @name clear
*/
Napi::Value Map::clear(Napi::CallbackInfo const& info)
{
map_->remove_all();
return info.Env().Undefined();
}
/**
* Give this map new dimensions
*
* @memberof Map
* @instance
* @name resize
* @param {number} width
* @param {number} height
*/
Napi::Value Map::resize(Napi::CallbackInfo const& info)
{
Napi::Env env = info.Env();
if (info.Length() != 2)
{
Napi::Error::New(env, "Please provide width and height").ThrowAsJavaScriptException();
return env.Undefined();
}
if (!info[0].IsNumber() || !info[1].IsNumber())
{
Napi::TypeError::New(env, "width and height must be integers").ThrowAsJavaScriptException();
return env.Undefined();
}
map_->resize(info[0].As<Napi::Number>().Int32Value(), info[1].As<Napi::Number>().Int32Value());
return env.Undefined();
}
/**
* Clone this map object, returning a value which can be changed
* without mutating the original
*
* @instance
* @name clone
* @memberof Map
* @returns {mapnik.Map} clone
*/
Napi::Value Map::clone(Napi::CallbackInfo const& info)
{
Napi::Env env = info.Env();
Napi::EscapableHandleScope scope(env);
try
{
auto map = std::make_shared<mapnik::Map>(*map_);
Napi::Value arg = Napi::External<map_ptr>::New(env, &map);
Napi::Object obj = Map::constructor.New({arg});
return scope.Escape(obj);
}
catch (...)
{
Napi::Error::New(env, "Could not create new Map instance").ThrowAsJavaScriptException();
}
return env.Undefined();
}
/**
* Writes the map to an xml file
*
* @memberof Map
* @instance
* @name save
* @param {string} file path
* @example
* map.save("path/to/map.xml");
*/
Napi::Value Map::save(Napi::CallbackInfo const& info)
{
Napi::Env env = info.Env();
if (info.Length() != 1 || !info[0].IsString())
{
Napi::TypeError::New(env, "first argument must be a path to map.xml to save").ThrowAsJavaScriptException();
return env.Undefined();
}
std::string filename = info[0].As<Napi::String>();
bool explicit_defaults = false;
try
{
mapnik::save_map(*map_, filename, explicit_defaults);
return Napi::Boolean::New(env, true);
}
catch (...)
{
}
return Napi::Boolean::New(env, false);
}
/**
* Converts the map to an XML string
*
* @memberof Map
* @instance
* @name toXML
* @example
* var xml = map.toXML();
*/
Napi::Value Map::toXML(Napi::CallbackInfo const& info)
{
Napi::Env env = info.Env();
bool explicit_defaults = false;
try
{
std::string map_string = mapnik::save_map_to_string(*map_, explicit_defaults);
return Napi::String::New(env, map_string);
}
catch (...)
{
}
Napi::TypeError::New(env, "Failed to export to XML").ThrowAsJavaScriptException();
return env.Undefined();
}
Napi::Value Map::zoomAll(Napi::CallbackInfo const& info)
{
Napi::Env env = info.Env();
try
{
map_->zoom_all();
}
catch (std::exception const& ex)
{
Napi::Error::New(env, ex.what()).ThrowAsJavaScriptException();
}
return env.Undefined();
}
Napi::Value Map::zoomToBox(Napi::CallbackInfo const& info)
{
Napi::Env env = info.Env();
double minx;
double miny;
double maxx;
double maxy;
if (info.Length() == 1)
{
if (!info[0].IsArray())
{
Napi::Error::New(env, "Must provide an array of: [minx,miny,maxx,maxy]").ThrowAsJavaScriptException();
return env.Undefined();
}
Napi::Array arr = info[0].As<Napi::Array>();
if (arr.Length() != 4 || !arr.Get(0u).IsNumber() || !arr.Get(1u).IsNumber() || !arr.Get(2u).IsNumber() || !arr.Get(3u).IsNumber())
{
Napi::Error::New(env, "Must provide an array of: [minx,miny,maxx,maxy]").ThrowAsJavaScriptException();
return env.Undefined();
}
minx = arr.Get(0u).As<Napi::Number>().DoubleValue();
miny = arr.Get(1u).As<Napi::Number>().DoubleValue();
maxx = arr.Get(2u).As<Napi::Number>().DoubleValue();
maxy = arr.Get(3u).As<Napi::Number>().DoubleValue();
}
else if (info.Length() != 4)
{
Napi::Error::New(env, "Must provide 4 arguments: minx,miny,maxx,maxy").ThrowAsJavaScriptException();
return env.Undefined();
}
else if (info[0].IsNumber() &&
info[1].IsNumber() &&
info[2].IsNumber() &&
info[3].IsNumber())
{
minx = info[0].As<Napi::Number>().DoubleValue();
miny = info[1].As<Napi::Number>().DoubleValue();
maxx = info[2].As<Napi::Number>().DoubleValue();
maxy = info[3].As<Napi::Number>().DoubleValue();
}
else
{
Napi::Error::New(env, "If you are providing 4 arguments: minx,miny,maxx,maxy - they must be all numbers")
.ThrowAsJavaScriptException();
return env.Undefined();
}
mapnik::box2d<double> box{minx, miny, maxx, maxy};
map_->zoom_to_box(box);
return env.Undefined();
}