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node-mapnik/src/mapnik_color.cpp
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#include "mapnik_color.hpp" | |
#include "utils.hpp" // for ATTR, TOSTR | |
// mapnik | |
#include <mapnik/color.hpp> // for color | |
// stl | |
#include <exception> // for exception | |
Nan::Persistent<v8::FunctionTemplate> Color::constructor; | |
/** | |
* **`mapnik.Color`** | |
* | |
* A `mapnik.Color` object used for handling and converting colors | |
* | |
* @class Color | |
* @param {string|number} value either an array of [r, g, b, a], | |
* a color keyword, or a CSS color in rgba() form. | |
* @param {number} r - red value between `0` and `255` | |
* @param {number} g - green value between `0` and `255` | |
* @param {number} b - blue value between `0` and `255` | |
* @param {boolean} pre - premultiplied, either `true` or `false` | |
* @throws {TypeError} if a `rgb` component is outside of the 0-255 range | |
* @example | |
* var c = new mapnik.Color('green'); | |
* var c = new mapnik.Color(0, 128, 0, 255); | |
* // premultiplied | |
* var c = new mapnik.Color(0, 128, 0, 255, true); | |
*/ | |
void Color::Initialize(v8::Local<v8::Object> target) { | |
Nan::HandleScope scope; | |
v8::Local<v8::FunctionTemplate> lcons = Nan::New<v8::FunctionTemplate>(Color::New); | |
lcons->InstanceTemplate()->SetInternalFieldCount(1); | |
lcons->SetClassName(Nan::New("Color").ToLocalChecked()); | |
// methods | |
Nan::SetPrototypeMethod(lcons, "hex", hex); | |
Nan::SetPrototypeMethod(lcons, "toString", toString); | |
// properties | |
ATTR(lcons, "r", get_prop, set_prop); | |
ATTR(lcons, "g", get_prop, set_prop); | |
ATTR(lcons, "b", get_prop, set_prop); | |
ATTR(lcons, "a", get_prop, set_prop); | |
ATTR(lcons, "premultiplied", get_premultiplied, set_premultiplied); | |
target->Set(Nan::New("Color").ToLocalChecked(), lcons->GetFunction()); | |
constructor.Reset(lcons); | |
} | |
Color::Color() : | |
Nan::ObjectWrap(), | |
this_() {} | |
Color::~Color() | |
{ | |
} | |
NAN_METHOD(Color::New) | |
{ | |
if (!info.IsConstructCall()) | |
{ | |
Nan::ThrowError("Cannot call constructor as function, you need to use 'new' keyword"); | |
return; | |
} | |
if (info[0]->IsExternal()) | |
{ | |
v8::Local<v8::External> ext = info[0].As<v8::External>(); | |
void* ptr = ext->Value(); | |
Color* c = static_cast<Color*>(ptr); | |
c->Wrap(info.This()); | |
info.GetReturnValue().Set(info.This()); | |
return; | |
} | |
color_ptr c_p; | |
try | |
{ | |
if (info.Length() == 1 && | |
info[0]->IsString()) | |
{ | |
c_p = std::make_shared<mapnik::color>(TOSTR(info[0])); | |
} | |
else if (info.Length() == 2 && | |
info[0]->IsString() && | |
info[1]->IsBoolean()) | |
{ | |
c_p = std::make_shared<mapnik::color>(TOSTR(info[0]),info[1]->BooleanValue()); | |
} | |
else if (info.Length() == 3 && | |
info[0]->IsNumber() && | |
info[1]->IsNumber() && | |
info[2]->IsNumber()) | |
{ | |
int r = info[0]->IntegerValue(); | |
int g = info[1]->IntegerValue(); | |
int b = info[2]->IntegerValue(); | |
if (r < 0 || r > 255 || g < 0 || g > 255 || b < 0 || b > 255) | |
{ | |
Nan::ThrowTypeError("color value out of range"); | |
return; | |
} | |
c_p = std::make_shared<mapnik::color>(r,g,b); | |
} | |
else if (info.Length() == 4 && | |
info[0]->IsNumber() && | |
info[1]->IsNumber() && | |
info[2]->IsNumber() && | |
info[3]->IsBoolean()) | |
{ | |
int r = info[0]->IntegerValue(); | |
int g = info[1]->IntegerValue(); | |
int b = info[2]->IntegerValue(); | |
if (r < 0 || r > 255 || g < 0 || g > 255 || b < 0 || b > 255) | |
{ | |
Nan::ThrowTypeError("color value out of range"); | |
return; | |
} | |
c_p = std::make_shared<mapnik::color>(r,g,b,255,info[3]->BooleanValue()); | |
} | |
else if (info.Length() == 4 && | |
info[0]->IsNumber() && | |
info[1]->IsNumber() && | |
info[2]->IsNumber() && | |
info[3]->IsNumber()) | |
{ | |
int r = info[0]->IntegerValue(); | |
int g = info[1]->IntegerValue(); | |
int b = info[2]->IntegerValue(); | |
int a = info[3]->IntegerValue(); | |
if (r < 0 || r > 255 || g < 0 || g > 255 || b < 0 || b > 255 || a < 0 || a > 255) | |
{ | |
Nan::ThrowTypeError("color value out of range"); | |
return; | |
} | |
c_p = std::make_shared<mapnik::color>(r,g,b,a); | |
} | |
else if (info.Length() == 5 && | |
info[0]->IsNumber() && | |
info[1]->IsNumber() && | |
info[2]->IsNumber() && | |
info[3]->IsNumber() && | |
info[4]->IsBoolean()) | |
{ | |
int r = info[0]->IntegerValue(); | |
int g = info[1]->IntegerValue(); | |
int b = info[2]->IntegerValue(); | |
int a = info[3]->IntegerValue(); | |
if (r < 0 || r > 255 || g < 0 || g > 255 || b < 0 || b > 255 || a < 0 || a > 255) | |
{ | |
Nan::ThrowTypeError("color value out of range"); | |
return; | |
} | |
c_p = std::make_shared<mapnik::color>(r,g,b,a,info[4]->BooleanValue()); | |
} | |
else | |
{ | |
Nan::ThrowTypeError("invalid arguments: colors can be created from a string, integer r,g,b values, or integer r,g,b,a values"); | |
return; | |
} | |
// todo allow int,int,int and int,int,int,int contructor | |
} | |
catch (std::exception const& ex) | |
{ | |
Nan::ThrowError(ex.what()); | |
return; | |
} | |
Color* c = new Color(); | |
c->Wrap(info.This()); | |
c->this_ = c_p; | |
info.GetReturnValue().Set(info.This()); | |
} | |
v8::Local<v8::Value> Color::NewInstance(mapnik::color const& color) { | |
Nan::EscapableHandleScope scope; | |
Color* c = new Color(); | |
c->this_ = std::make_shared<mapnik::color>(color); | |
v8::Local<v8::Value> ext = Nan::New<v8::External>(c); | |
Nan::MaybeLocal<v8::Object> maybe_local = Nan::NewInstance(Nan::New(constructor)->GetFunction(), 1, &ext); | |
if (maybe_local.IsEmpty()) Nan::ThrowError("Could not create new Color instance"); | |
return scope.Escape(maybe_local.ToLocalChecked()); | |
} | |
NAN_GETTER(Color::get_prop) | |
{ | |
Color* c = Nan::ObjectWrap::Unwrap<Color>(info.Holder()); | |
std::string a = TOSTR(property); | |
if (a == "a") | |
info.GetReturnValue().Set(Nan::New<v8::Integer>(c->get()->alpha())); | |
else if (a == "r") | |
info.GetReturnValue().Set(Nan::New<v8::Integer>(c->get()->red())); | |
else if (a == "g") | |
info.GetReturnValue().Set(Nan::New<v8::Integer>(c->get()->green())); | |
else //if (a == "b") | |
info.GetReturnValue().Set(Nan::New<v8::Integer>(c->get()->blue())); | |
} | |
NAN_SETTER(Color::set_prop) | |
{ | |
Color* c = Nan::ObjectWrap::Unwrap<Color>(info.Holder()); | |
std::string a = TOSTR(property); | |
if (!value->IsNumber()) | |
{ | |
Nan::ThrowTypeError("color channel value must be an integer"); | |
return; | |
} | |
int val = value->IntegerValue(); | |
if (val < 0 || val > 255) | |
{ | |
Nan::ThrowTypeError("Value out of range for color channel"); | |
return; | |
} | |
if (a == "a") { | |
c->get()->set_alpha(val); | |
} else if (a == "r") { | |
c->get()->set_red(val); | |
} else if (a == "g") { | |
c->get()->set_green(val); | |
} else if (a == "b") { | |
c->get()->set_blue(val); | |
} | |
} | |
/** | |
* Get whether this color is premultiplied | |
* | |
* @name get_premultiplied | |
* @memberof Color | |
* @instance | |
* @returns {boolean} premultiplied | |
*/ | |
NAN_GETTER(Color::get_premultiplied) | |
{ | |
Color* c = Nan::ObjectWrap::Unwrap<Color>(info.Holder()); | |
info.GetReturnValue().Set(Nan::New<v8::Boolean>(c->get()->get_premultiplied())); | |
return; | |
} | |
/** | |
* Set whether this color should be premultiplied | |
* | |
* @name set_premultiplied | |
* @memberof Color | |
* @instance | |
* @param {boolean} premultiplied | |
* @example | |
* var c = new mapnik.Color('green'); | |
* c.set_premultiplied(true); | |
* @throws {TypeError} given a non-boolean argument | |
*/ | |
NAN_SETTER(Color::set_premultiplied) | |
{ | |
Color* c = Nan::ObjectWrap::Unwrap<Color>(info.Holder()); | |
if (!value->IsBoolean()) | |
{ | |
Nan::ThrowTypeError("Value set to premultiplied must be a boolean"); | |
return; | |
} | |
c->get()->set_premultiplied(value->BooleanValue()); | |
} | |
/** | |
* Get this color's representation as a string | |
* | |
* @name toString | |
* @memberof Color | |
* @instance | |
* @returns {string} color as a string | |
* @example | |
* var green = new mapnik.Color('green'); | |
* green.toString() | |
* // 'rgb(0,128,0)' | |
*/ | |
NAN_METHOD(Color::toString) | |
{ | |
Color* c = Nan::ObjectWrap::Unwrap<Color>(info.Holder()); | |
info.GetReturnValue().Set(Nan::New<v8::String>(c->get()->to_string()).ToLocalChecked()); | |
} | |
/** | |
* Get this color represented as a hexademical string | |
* | |
* @name hex | |
* @memberof Color | |
* @instance | |
* @returns {string} hex representation | |
* @example | |
* var c = new mapnik.Color('green'); | |
* c.hex(); | |
* // '#008000' | |
*/ | |
NAN_METHOD(Color::hex) | |
{ | |
Color* c = Nan::ObjectWrap::Unwrap<Color>(info.Holder()); | |
std::string hex = c->get()->to_hex_string(); | |
info.GetReturnValue().Set(Nan::New<v8::String>(hex).ToLocalChecked()); | |
} |