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122 lines
2.7 KiB
122 lines
2.7 KiB
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//
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// Gradient.cc
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//
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// Copyright (c) 2010 LearnBoost <tj@learnboost.com>
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//
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#include "color.h"
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#include "Canvas.h"
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#include "CanvasGradient.h"
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Nan::Persistent<FunctionTemplate> Gradient::constructor;
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/*
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* Initialize CanvasGradient.
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*/
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void
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Gradient::Initialize(Nan::ADDON_REGISTER_FUNCTION_ARGS_TYPE target) {
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Nan::HandleScope scope;
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// Constructor
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Local<FunctionTemplate> ctor = Nan::New<FunctionTemplate>(Gradient::New);
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constructor.Reset(ctor);
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ctor->InstanceTemplate()->SetInternalFieldCount(1);
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ctor->SetClassName(Nan::New("CanvasGradient").ToLocalChecked());
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// Prototype
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Nan::SetPrototypeMethod(ctor, "addColorStop", AddColorStop);
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Nan::Set(target, Nan::New("CanvasGradient").ToLocalChecked(), ctor->GetFunction());
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}
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/*
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* Initialize a new CanvasGradient.
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*/
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NAN_METHOD(Gradient::New) {
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if (!info.IsConstructCall()) {
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return Nan::ThrowTypeError("Class constructors cannot be invoked without 'new'");
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}
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// Linear
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if (4 == info.Length()) {
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Gradient *grad = new Gradient(
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info[0]->NumberValue()
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, info[1]->NumberValue()
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, info[2]->NumberValue()
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, info[3]->NumberValue());
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grad->Wrap(info.This());
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info.GetReturnValue().Set(info.This());
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return;
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}
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// Radial
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if (6 == info.Length()) {
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Gradient *grad = new Gradient(
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info[0]->NumberValue()
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, info[1]->NumberValue()
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, info[2]->NumberValue()
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, info[3]->NumberValue()
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, info[4]->NumberValue()
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, info[5]->NumberValue());
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grad->Wrap(info.This());
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info.GetReturnValue().Set(info.This());
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return;
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}
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return Nan::ThrowTypeError("invalid arguments");
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}
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/*
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* Add color stop.
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*/
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NAN_METHOD(Gradient::AddColorStop) {
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if (!info[0]->IsNumber())
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return Nan::ThrowTypeError("offset required");
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if (!info[1]->IsString())
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return Nan::ThrowTypeError("color string required");
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Gradient *grad = Nan::ObjectWrap::Unwrap<Gradient>(info.This());
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short ok;
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String::Utf8Value str(info[1]);
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uint32_t rgba = rgba_from_string(*str, &ok);
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if (ok) {
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rgba_t color = rgba_create(rgba);
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cairo_pattern_add_color_stop_rgba(
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grad->pattern()
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, info[0]->NumberValue()
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, color.r
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, color.g
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, color.b
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, color.a);
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} else {
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return Nan::ThrowTypeError("parse color failed");
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}
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}
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/*
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* Initialize linear gradient.
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*/
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Gradient::Gradient(double x0, double y0, double x1, double y1) {
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_pattern = cairo_pattern_create_linear(x0, y0, x1, y1);
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}
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/*
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* Initialize radial gradient.
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*/
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Gradient::Gradient(double x0, double y0, double r0, double x1, double y1, double r1) {
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_pattern = cairo_pattern_create_radial(x0, y0, r0, x1, y1, r1);
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}
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/*
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* Destroy the pattern.
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*/
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Gradient::~Gradient() {
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cairo_pattern_destroy(_pattern);
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}
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