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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
use cssparser::RGBA;
use canvas_traits::{CanvasGradientStop, FillOrStrokeStyle, LinearGradientStyle, RadialGradientStyle};
use dom::bindings::cell::DOMRefCell;
use dom::bindings::codegen::Bindings::CanvasGradientBinding;
use dom::bindings::codegen::Bindings::CanvasGradientBinding::CanvasGradientMethods;
use dom::bindings::global::GlobalRef;
use dom::bindings::js::{JSRef, Temporary};
use dom::bindings::num::Finite;
use dom::bindings::utils::{Reflector, reflect_dom_object};
use dom::canvasrenderingcontext2d::parse_color;
// https://html.spec.whatwg.org/multipage/#canvasgradient
#[dom_struct]
pub struct CanvasGradient {
reflector_: Reflector,
style: CanvasGradientStyle,
stops: DOMRefCell<Vec<CanvasGradientStop>>,
}
#[jstraceable]
#[derive(Clone)]
pub enum CanvasGradientStyle {
Linear(LinearGradientStyle),
Radial(RadialGradientStyle),
}
impl CanvasGradient {
fn new_inherited(style: CanvasGradientStyle) -> CanvasGradient {
CanvasGradient {
reflector_: Reflector::new(),
style: style,
stops: DOMRefCell::new(Vec::new()),
}
}
pub fn new(global: GlobalRef, style: CanvasGradientStyle) -> Temporary<CanvasGradient> {
reflect_dom_object(box CanvasGradient::new_inherited(style),
global, CanvasGradientBinding::Wrap)
}
}
impl<'a> CanvasGradientMethods for JSRef<'a, CanvasGradient> {
// https://html.spec.whatwg.org/multipage/#dom-canvasgradient-addcolorstop
fn AddColorStop(self, offset: Finite<f64>, color: String) {
let default_black = RGBA {
red: 0.0,
green: 0.0,
blue: 0.0,
alpha: 1.0,
};
self.stops.borrow_mut().push(CanvasGradientStop {
offset: (*offset) as f64,
color: parse_color(&color).unwrap_or(default_black),
});
}
}
pub trait ToFillOrStrokeStyle {
fn to_fill_or_stroke_style(&self) -> FillOrStrokeStyle;
}
impl<'a> ToFillOrStrokeStyle for JSRef<'a, CanvasGradient> {
fn to_fill_or_stroke_style(&self) -> FillOrStrokeStyle {
let gradient_stops = self.stops.borrow().clone();
match self.style {
CanvasGradientStyle::Linear(ref gradient) => {
FillOrStrokeStyle::LinearGradient(
LinearGradientStyle::new(gradient.x0, gradient.y0,
gradient.x1, gradient.y1,
gradient_stops))
},
CanvasGradientStyle::Radial(ref gradient) => {
FillOrStrokeStyle::RadialGradient(
RadialGradientStyle::new(gradient.x0, gradient.y0, gradient.r0,
gradient.x1, gradient.y1, gradient.r1,
gradient_stops))
}
}
}
}
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