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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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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(Handle<Object> target) {
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HandleScope scope;
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// Constructor
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constructor = Persistent<FunctionTemplate>::New(FunctionTemplate::New(Gradient::New));
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constructor->InstanceTemplate()->SetInternalFieldCount(1);
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constructor->SetClassName(String::NewSymbol("CanvasGradient"));
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// Prototype
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NODE_SET_PROTOTYPE_METHOD(constructor, "addColorStop", AddColorStop);
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target->Set(String::NewSymbol("CanvasGradient"), constructor->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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Handle<Value>
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Gradient::New(const Arguments &args) {
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HandleScope scope;
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// Linear
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if (4 == args.Length()) {
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Gradient *grad = new Gradient(
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args[0]->NumberValue()
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, args[1]->NumberValue()
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, args[2]->NumberValue()
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, args[3]->NumberValue());
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grad->Wrap(args.This());
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return args.This();
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}
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// Radial
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if (6 == args.Length()) {
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Gradient *grad = new Gradient(
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args[0]->NumberValue()
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, args[1]->NumberValue()
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, args[2]->NumberValue()
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, args[3]->NumberValue()
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, args[4]->NumberValue()
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, args[5]->NumberValue());
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grad->Wrap(args.This());
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return args.This();
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}
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return ThrowException(Exception::TypeError(String::New("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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Handle<Value>
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Gradient::AddColorStop(const Arguments &args) {
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HandleScope scope;
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if (!args[0]->IsNumber())
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return ThrowException(Exception::TypeError(String::New("offset required")));
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if (!args[1]->IsString())
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return ThrowException(Exception::TypeError(String::New("color string required")));
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Gradient *grad = ObjectWrap::Unwrap<Gradient>(args.This());
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short ok;
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String::AsciiValue str(args[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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, args[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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}
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return Undefined();
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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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_x0(x0), _y0(y0), _x1(x1), _y1(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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_x0(x0), _y0(y0), _x1(x1), _y1(y1), _r0(r0), _r1(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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