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676f5837b3
An SVGLength can be read-only, e.g. all animVal values cannot be modified. Implement this for all instantiations of SVGLength. While we're here, add `fake_animated_length_fixme()` so we can easily find all sites where we need to improve our animated length game.
119 lines
4.9 KiB
C++
119 lines
4.9 KiB
C++
/*
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* Copyright (c) 2022, Sam Atkins <atkinssj@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibGfx/Path.h>
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#include <LibWeb/Bindings/SVGEllipseElementPrototype.h>
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#include <LibWeb/HTML/Window.h>
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#include <LibWeb/SVG/AttributeNames.h>
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#include <LibWeb/SVG/AttributeParser.h>
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#include <LibWeb/SVG/SVGEllipseElement.h>
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namespace Web::SVG {
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GC_DEFINE_ALLOCATOR(SVGEllipseElement);
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SVGEllipseElement::SVGEllipseElement(DOM::Document& document, DOM::QualifiedName qualified_name)
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: SVGGeometryElement(document, qualified_name)
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{
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}
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void SVGEllipseElement::initialize(JS::Realm& realm)
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{
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WEB_SET_PROTOTYPE_FOR_INTERFACE(SVGEllipseElement);
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Base::initialize(realm);
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}
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void SVGEllipseElement::attribute_changed(FlyString const& name, Optional<String> const& old_value, Optional<String> const& value, Optional<FlyString> const& namespace_)
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{
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Base::attribute_changed(name, old_value, value, namespace_);
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if (name == SVG::AttributeNames::cx) {
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m_center_x = AttributeParser::parse_coordinate(value.value_or(String {}));
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} else if (name == SVG::AttributeNames::cy) {
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m_center_y = AttributeParser::parse_coordinate(value.value_or(String {}));
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} else if (name == SVG::AttributeNames::rx) {
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m_radius_x = AttributeParser::parse_positive_length(value.value_or(String {}));
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} else if (name == SVG::AttributeNames::ry) {
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m_radius_y = AttributeParser::parse_positive_length(value.value_or(String {}));
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}
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}
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Gfx::Path SVGEllipseElement::get_path(CSSPixelSize)
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{
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float rx = m_radius_x.value_or(0);
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float ry = m_radius_y.value_or(0);
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float cx = m_center_x.value_or(0);
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float cy = m_center_y.value_or(0);
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Gfx::Path path;
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// A computed value of zero for either dimension, or a computed value of auto for both dimensions, disables rendering of the element.
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if (rx == 0 || ry == 0)
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return path;
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Gfx::FloatSize radii = { rx, ry };
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double x_axis_rotation = 0;
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bool large_arc = false;
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bool sweep = true; // Note: Spec says it should be false, but it's wrong. https://github.com/w3c/svgwg/issues/765
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// 1. A move-to command to the point cx+rx,cy;
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path.move_to({ cx + rx, cy });
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// 2. arc to cx,cy+ry;
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path.elliptical_arc_to({ cx, cy + ry }, radii, x_axis_rotation, large_arc, sweep);
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// 3. arc to cx-rx,cy;
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path.elliptical_arc_to({ cx - rx, cy }, radii, x_axis_rotation, large_arc, sweep);
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// 4. arc to cx,cy-ry;
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path.elliptical_arc_to({ cx, cy - ry }, radii, x_axis_rotation, large_arc, sweep);
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// 5. arc with a segment-completing close path operation.
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path.elliptical_arc_to({ cx + rx, cy }, radii, x_axis_rotation, large_arc, sweep);
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return path;
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}
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// https://www.w3.org/TR/SVG11/shapes.html#EllipseElementCXAttribute
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GC::Ref<SVGAnimatedLength> SVGEllipseElement::cx() const
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{
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// FIXME: Populate the unit type when it is parsed (0 here is "unknown").
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// FIXME: Create a proper animated value when animations are supported.
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auto base_length = SVGLength::create(realm(), 0, m_center_x.value_or(0), SVGLength::ReadOnly::No);
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auto anim_length = SVGLength::create(realm(), 0, m_center_x.value_or(0), SVGLength::ReadOnly::Yes);
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return SVGAnimatedLength::create(realm(), base_length, anim_length);
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}
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// https://www.w3.org/TR/SVG11/shapes.html#EllipseElementCYAttribute
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GC::Ref<SVGAnimatedLength> SVGEllipseElement::cy() const
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{
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// FIXME: Populate the unit type when it is parsed (0 here is "unknown").
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// FIXME: Create a proper animated value when animations are supported.
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auto base_length = SVGLength::create(realm(), 0, m_center_y.value_or(0), SVGLength::ReadOnly::No);
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auto anim_length = SVGLength::create(realm(), 0, m_center_y.value_or(0), SVGLength::ReadOnly::Yes);
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return SVGAnimatedLength::create(realm(), base_length, anim_length);
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}
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// https://www.w3.org/TR/SVG11/shapes.html#EllipseElementRXAttribute
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GC::Ref<SVGAnimatedLength> SVGEllipseElement::rx() const
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{
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// FIXME: Populate the unit type when it is parsed (0 here is "unknown").
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// FIXME: Create a proper animated value when animations are supported.
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auto base_length = SVGLength::create(realm(), 0, m_radius_x.value_or(0), SVGLength::ReadOnly::No);
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auto anim_length = SVGLength::create(realm(), 0, m_radius_x.value_or(0), SVGLength::ReadOnly::Yes);
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return SVGAnimatedLength::create(realm(), base_length, anim_length);
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}
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// https://www.w3.org/TR/SVG11/shapes.html#EllipseElementRYAttribute
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GC::Ref<SVGAnimatedLength> SVGEllipseElement::ry() const
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{
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// FIXME: Populate the unit type when it is parsed (0 here is "unknown").
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// FIXME: Create a proper animated value when animations are supported.
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auto base_length = SVGLength::create(realm(), 0, m_radius_y.value_or(0), SVGLength::ReadOnly::No);
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auto anim_length = SVGLength::create(realm(), 0, m_radius_y.value_or(0), SVGLength::ReadOnly::Yes);
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return SVGAnimatedLength::create(realm(), base_length, anim_length);
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}
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}
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