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216 lines
11 KiB
C++
216 lines
11 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/Intrinsics.h>
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#include <LibWeb/Bindings/SVGRectElementPrototype.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/SVGAnimatedLength.h>
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#include <LibWeb/SVG/SVGLength.h>
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#include <LibWeb/SVG/SVGRectElement.h>
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namespace Web::SVG {
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GC_DEFINE_ALLOCATOR(SVGRectElement);
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SVGRectElement::SVGRectElement(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 SVGRectElement::initialize(JS::Realm& realm)
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{
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WEB_SET_PROTOTYPE_FOR_INTERFACE(SVGRectElement);
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Base::initialize(realm);
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}
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void SVGRectElement::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::x) {
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m_x = AttributeParser::parse_number_percentage(value.value_or(String {}));
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} else if (name == SVG::AttributeNames::y) {
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m_y = AttributeParser::parse_number_percentage(value.value_or(String {}));
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} else if (name == SVG::AttributeNames::width) {
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m_width = AttributeParser::parse_number_percentage(value.value_or(String {}));
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} else if (name == SVG::AttributeNames::height) {
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m_height = AttributeParser::parse_number_percentage(value.value_or(String {}));
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} else if (name == SVG::AttributeNames::rx) {
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m_radius_x = AttributeParser::parse_number_percentage(value.value_or(String {}));
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} else if (name == SVG::AttributeNames::ry) {
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m_radius_y = AttributeParser::parse_number_percentage(value.value_or(String {}));
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}
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}
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Gfx::Path SVGRectElement::get_path(CSSPixelSize viewport_size)
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{
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float width = m_width.value_or(NumberPercentage::create_number(0)).resolve_relative_to(viewport_size.width().to_float());
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float height = m_height.value_or(NumberPercentage::create_number(0)).resolve_relative_to(viewport_size.height().to_float());
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float x = m_x.value_or(NumberPercentage::create_number(0)).resolve_relative_to(viewport_size.width().to_float());
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float y = m_y.value_or(NumberPercentage::create_number(0)).resolve_relative_to(viewport_size.height().to_float());
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Gfx::Path path;
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// If width or height is zero, rendering is disabled.
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if (width == 0 || height == 0)
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return path;
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auto corner_radii = calculate_used_corner_radius_values(viewport_size);
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float rx = corner_radii.width();
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float ry = corner_radii.height();
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// 1. perform an absolute moveto operation to location (x+rx,y);
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path.move_to({ x + rx, y });
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// 2, perform an absolute horizontal lineto with parameter x+width-rx;
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path.horizontal_line_to(x + width - rx);
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// 3. if both rx and ry are greater than zero,
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// perform an absolute elliptical arc operation to coordinate (x+width,y+ry),
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// where rx and ry are used as the equivalent parameters to the elliptical arc command,
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// the x-axis-rotation and large-arc-flag are set to zero,
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// the sweep-flag is set to one;
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double x_axis_rotation = 0;
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bool large_arc_flag = false;
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bool sweep_flag = true;
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if (rx > 0 && ry > 0)
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path.elliptical_arc_to({ x + width, y + ry }, corner_radii, x_axis_rotation, large_arc_flag, sweep_flag);
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// 4. perform an absolute vertical lineto parameter y+height-ry;
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path.vertical_line_to(y + height - ry);
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// 5. if both rx and ry are greater than zero,
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// perform an absolute elliptical arc operation to coordinate (x+width-rx,y+height),
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// using the same parameters as previously;
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if (rx > 0 && ry > 0)
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path.elliptical_arc_to({ x + width - rx, y + height }, corner_radii, x_axis_rotation, large_arc_flag, sweep_flag);
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// 6. perform an absolute horizontal lineto parameter x+rx;
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path.horizontal_line_to(x + rx);
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// 7. if both rx and ry are greater than zero,
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// perform an absolute elliptical arc operation to coordinate (x,y+height-ry),
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// using the same parameters as previously;
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if (rx > 0 && ry > 0)
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path.elliptical_arc_to({ x, y + height - ry }, corner_radii, x_axis_rotation, large_arc_flag, sweep_flag);
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// 8. perform an absolute vertical lineto parameter y+ry
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path.vertical_line_to(y + ry);
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// 9. if both rx and ry are greater than zero,
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// perform an absolute elliptical arc operation with a segment-completing close path operation,
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// using the same parameters as previously.
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if (rx > 0 && ry > 0)
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path.elliptical_arc_to({ x + rx, y }, corner_radii, x_axis_rotation, large_arc_flag, sweep_flag);
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path.close();
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return path;
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}
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Gfx::FloatSize SVGRectElement::calculate_used_corner_radius_values(CSSPixelSize viewport_size) const
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{
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// 1. Let rx and ry be length values.
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float rx = 0;
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float ry = 0;
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// 2. If neither ‘rx’ nor ‘ry’ are properly specified, then set both rx and ry to 0. (This will result in square corners.)
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if (!m_radius_x.has_value() && !m_radius_y.has_value()) {
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rx = 0;
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ry = 0;
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}
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// 3. Otherwise, if a properly specified value is provided for ‘rx’, but not for ‘ry’, then set both rx and ry to the value of ‘rx’.
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else if (m_radius_x.has_value() && !m_radius_y.has_value()) {
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rx = m_radius_x.value().resolve_relative_to(viewport_size.width().to_float());
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ry = m_radius_x.value().resolve_relative_to(viewport_size.width().to_float());
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}
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// 4. Otherwise, if a properly specified value is provided for ‘ry’, but not for ‘rx’, then set both rx and ry to the value of ‘ry’.
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else if (m_radius_y.has_value() && !m_radius_x.has_value()) {
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rx = m_radius_y.value().resolve_relative_to(viewport_size.height().to_float());
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ry = m_radius_y.value().resolve_relative_to(viewport_size.height().to_float());
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}
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// 5. Otherwise, both ‘rx’ and ‘ry’ were specified properly. Set rx to the value of ‘rx’ and ry to the value of ‘ry’.
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else {
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rx = m_radius_x.value().resolve_relative_to(viewport_size.width().to_float());
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ry = m_radius_y.value().resolve_relative_to(viewport_size.height().to_float());
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}
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// 6. If rx is greater than half of ‘width’, then set rx to half of ‘width’.
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auto half_width = m_width.value_or(NumberPercentage::create_number(0)).resolve_relative_to(viewport_size.width().to_float()) / 2;
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if (rx > half_width)
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rx = half_width;
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// 7. If ry is greater than half of ‘height’, then set ry to half of ‘height’.
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auto half_height = m_height.value_or(NumberPercentage::create_number(0)).resolve_relative_to(viewport_size.height().to_float()) / 2;
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if (ry > half_height)
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ry = half_height;
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// 8. The effective values of ‘rx’ and ‘ry’ are rx and ry, respectively.
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return { rx, ry };
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}
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// https://www.w3.org/TR/SVG11/shapes.html#RectElementXAttribute
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GC::Ref<SVGAnimatedLength> SVGRectElement::x() 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_x.value_or(NumberPercentage::create_number(0)).value(), SVGLength::ReadOnly::No);
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auto anim_length = SVGLength::create(realm(), 0, m_x.value_or(NumberPercentage::create_number(0)).value(), 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#RectElementYAttribute
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GC::Ref<SVGAnimatedLength> SVGRectElement::y() 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_y.value_or(NumberPercentage::create_number(0)).value(), SVGLength::ReadOnly::No);
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auto anim_length = SVGLength::create(realm(), 0, m_y.value_or(NumberPercentage::create_number(0)).value(), 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#RectElementWidthAttribute
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GC::Ref<SVGAnimatedLength> SVGRectElement::width() 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_width.value_or(NumberPercentage::create_number(0)).value(), SVGLength::ReadOnly::No);
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auto anim_length = SVGLength::create(realm(), 0, m_width.value_or(NumberPercentage::create_number(0)).value(), 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#RectElementHeightAttribute
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GC::Ref<SVGAnimatedLength> SVGRectElement::height() 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_height.value_or(NumberPercentage::create_number(0)).value(), SVGLength::ReadOnly::No);
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auto anim_length = SVGLength::create(realm(), 0, m_height.value_or(NumberPercentage::create_number(0)).value(), 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#RectElementRXAttribute
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GC::Ref<SVGAnimatedLength> SVGRectElement::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(NumberPercentage::create_number(0)).value(), SVGLength::ReadOnly::No);
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auto anim_length = SVGLength::create(realm(), 0, m_radius_x.value_or(NumberPercentage::create_number(0)).value(), 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#RectElementRYAttribute
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GC::Ref<SVGAnimatedLength> SVGRectElement::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(NumberPercentage::create_number(0)).value(), SVGLength::ReadOnly::No);
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auto anim_length = SVGLength::create(realm(), 0, m_radius_y.value_or(NumberPercentage::create_number(0)).value(), 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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