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https://github.com/RGBCube/serenity
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78 lines
2.4 KiB
C++
78 lines
2.4 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 "SVGEllipseElement.h"
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#include <LibWeb/SVG/AttributeNames.h>
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#include <LibWeb/SVG/AttributeParser.h>
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namespace Web::SVG {
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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::parse_attribute(FlyString const& name, String const& value)
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{
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SVGGeometryElement::parse_attribute(name, value);
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if (name == SVG::AttributeNames::cx) {
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m_center_x = AttributeParser::parse_coordinate(value);
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m_path.clear();
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} else if (name == SVG::AttributeNames::cy) {
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m_center_y = AttributeParser::parse_coordinate(value);
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m_path.clear();
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} else if (name == SVG::AttributeNames::rx) {
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m_radius_x = AttributeParser::parse_positive_length(value);
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m_path.clear();
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} else if (name == SVG::AttributeNames::ry) {
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m_radius_y = AttributeParser::parse_positive_length(value);
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m_path.clear();
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}
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}
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Gfx::Path& SVGEllipseElement::get_path()
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{
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if (m_path.has_value())
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return m_path.value();
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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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m_path = move(path);
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return m_path.value();
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}
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Gfx::FloatPoint 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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m_path = move(path);
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return m_path.value();
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}
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}
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