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+/*
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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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+
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+#include "SVGRectElement.h"
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+#include <LibWeb/SVG/AttributeNames.h>
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+#include <LibWeb/SVG/AttributeParser.h>
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+
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+namespace Web::SVG {
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+
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+SVGRectElement::SVGRectElement(DOM::Document& document, QualifiedName qualified_name)
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+ : SVGGeometryElement(document, qualified_name)
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+{
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+}
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+
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+void SVGRectElement::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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+
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+ if (name == SVG::AttributeNames::x) {
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+ m_x = AttributeParser::parse_coordinate(value);
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+ m_path.clear();
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+ } else if (name == SVG::AttributeNames::y) {
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+ m_y = AttributeParser::parse_coordinate(value);
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+ m_path.clear();
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+ } else if (name == SVG::AttributeNames::width) {
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+ m_width = AttributeParser::parse_positive_length(value);
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+ m_path.clear();
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+ } else if (name == SVG::AttributeNames::height) {
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+ m_height = AttributeParser::parse_positive_length(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_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_length(value);
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+ m_path.clear();
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+ }
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+}
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+
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+Gfx::Path& SVGRectElement::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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+
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+ float width = m_width.value_or(0);
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+ float height = m_height.value_or(0);
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+ float x = m_x.value_or(0);
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+ float y = m_y.value_or(0);
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+
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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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+ m_path = move(path);
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+ return m_path.value();
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+ }
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+
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+ auto corner_radii = calculate_used_corner_radius_values();
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+ float rx = corner_radii.x();
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+ float ry = corner_radii.y();
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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+Gfx::FloatPoint SVGRectElement::calculate_used_corner_radius_values()
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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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+
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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()) {
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+ rx = m_radius_x.value();
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+ ry = m_radius_x.value();
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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()) {
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+ rx = m_radius_y.value();
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+ ry = m_radius_y.value();
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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();
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+ ry = m_radius_y.value();
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+ }
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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(0) / 2;
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+ if (rx > half_width)
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+ rx = half_width;
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+
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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(0) / 2;
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+ if (ry > half_height)
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+ ry = half_height;
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+
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+ // 8. The effective values of ‘rx’ and ‘ry’ are rx and ry, respectively.
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+ return Gfx::FloatPoint { rx, ry };
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+}
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+
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+}
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Sam Atkins