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27a3e11f02
This gets: - CanvasRenderingContext2D.createLinearGradient() - CanvasRenderingContext2D.createConicGradient() - CanvasRenderingContext2D.createRadialGradient() Actually working as fill styles for paths and rectangles :^) Getting them working for strokes is left as an exercise is left as an exercise for the reader.
71 lines
3 KiB
C++
71 lines
3 KiB
C++
/*
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* Copyright (c) 2022, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2023, MacDue <macdue@dueutil.tech>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/QuickSort.h>
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#include <LibWeb/Bindings/Intrinsics.h>
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#include <LibWeb/HTML/CanvasGradient.h>
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#include <LibWeb/WebIDL/ExceptionOr.h>
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namespace Web::HTML {
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JS::NonnullGCPtr<CanvasGradient> CanvasGradient::create_radial(JS::Realm& realm, double x0, double y0, double r0, double x1, double y1, double r1)
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{
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auto radial_gradient = Gfx::CanvasRadialGradientPaintStyle::create(Gfx::FloatPoint { x0, y0 }, r0, Gfx::FloatPoint { x1, y1 }, r1);
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return realm.heap().allocate<CanvasGradient>(realm, realm, *radial_gradient);
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}
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JS::NonnullGCPtr<CanvasGradient> CanvasGradient::create_linear(JS::Realm& realm, double x0, double y0, double x1, double y1)
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{
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auto linear_gradient = Gfx::CanvasLinearGradientPaintStyle::create(Gfx::FloatPoint { x0, y0 }, Gfx::FloatPoint { x1, y1 });
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return realm.heap().allocate<CanvasGradient>(realm, realm, *linear_gradient);
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}
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JS::NonnullGCPtr<CanvasGradient> CanvasGradient::create_conic(JS::Realm& realm, double start_angle, double x, double y)
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{
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auto conic_gradient = Gfx::CanvasConicGradientPaintStyle::create(Gfx::FloatPoint { x, y }, start_angle);
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return realm.heap().allocate<CanvasGradient>(realm, realm, *conic_gradient);
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}
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CanvasGradient::CanvasGradient(JS::Realm& realm, Gfx::GradientPaintStyle& gradient)
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: PlatformObject(realm)
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, m_gradient(gradient)
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{
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}
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CanvasGradient::~CanvasGradient() = default;
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void CanvasGradient::initialize(JS::Realm& realm)
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{
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Base::initialize(realm);
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set_prototype(&Bindings::ensure_web_prototype<Bindings::CanvasGradientPrototype>(realm, "CanvasGradient"));
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}
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// https://html.spec.whatwg.org/multipage/canvas.html#dom-canvasgradient-addcolorstop
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WebIDL::ExceptionOr<void> CanvasGradient::add_color_stop(double offset, DeprecatedString const& color)
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{
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// 1. If the offset is less than 0 or greater than 1, then throw an "IndexSizeError" DOMException.
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if (offset < 0 || offset > 1)
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return WebIDL::IndexSizeError::create(realm(), "CanvasGradient color stop offset out of bounds");
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// 2. Let parsed color be the result of parsing color.
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auto parsed_color = Color::from_string(color);
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// 3. If parsed color is failure, throw a "SyntaxError" DOMException.
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if (!parsed_color.has_value())
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return WebIDL::SyntaxError::create(realm(), "Could not parse color for CanvasGradient");
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// 4. Place a new stop on the gradient, at offset offset relative to the whole gradient, and with the color parsed color.
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m_gradient->add_color_stop(offset, parsed_color.value());
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// FIXME: If multiple stops are added at the same offset on a gradient, then they must be placed in the order added,
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// with the first one closest to the start of the gradient, and each subsequent one infinitesimally further along
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// towards the end point (in effect causing all but the first and last stop added at each point to be ignored).
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return {};
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}
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}
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