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LibWeb: Add SVG <rect> element and test case :^)

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Sam Atkins 2022-02-11 15:52:42 +00:00 • committed by Andreas Kling
parent aa2f20fb60
commit 1dde6a0a2b
11 changed files with 225 additions and 1 deletions
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153
Userland/Libraries/LibWeb/SVG/SVGRectElement.cpp Normal file
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/*
* Copyright (c) 2022, Sam Atkins <atkinssj@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include "SVGRectElement.h"
#include <LibWeb/SVG/AttributeNames.h>
#include <LibWeb/SVG/AttributeParser.h>
namespace Web::SVG {
SVGRectElement::SVGRectElement(DOM::Document& document, QualifiedName qualified_name)
: SVGGeometryElement(document, qualified_name)
{
}
void SVGRectElement::parse_attribute(FlyString const& name, String const& value)
{
SVGGeometryElement::parse_attribute(name, value);
if (name == SVG::AttributeNames::x) {
m_x = AttributeParser::parse_coordinate(value);
m_path.clear();
} else if (name == SVG::AttributeNames::y) {
m_y = AttributeParser::parse_coordinate(value);
m_path.clear();
} else if (name == SVG::AttributeNames::width) {
m_width = AttributeParser::parse_positive_length(value);
m_path.clear();
} else if (name == SVG::AttributeNames::height) {
m_height = AttributeParser::parse_positive_length(value);
m_path.clear();
} else if (name == SVG::AttributeNames::rx) {
m_radius_x = AttributeParser::parse_length(value);
m_path.clear();
} else if (name == SVG::AttributeNames::ry) {
m_radius_y = AttributeParser::parse_length(value);
m_path.clear();
}
}
Gfx::Path& SVGRectElement::get_path()
{
if (m_path.has_value())
return m_path.value();
float width = m_width.value_or(0);
float height = m_height.value_or(0);
float x = m_x.value_or(0);
float y = m_y.value_or(0);
Gfx::Path path;
// If width or height is zero, rendering is disabled.
if (width == 0 && height == 0) {
m_path = move(path);
return m_path.value();
}
auto corner_radii = calculate_used_corner_radius_values();
float rx = corner_radii.x();
float ry = corner_radii.y();
// 1. perform an absolute moveto operation to location (x+rx,y);
path.move_to({ x + rx, y });
// 2, perform an absolute horizontal lineto with parameter x+width-rx;
path.horizontal_line_to(x + width - rx);
// 3. if both rx and ry are greater than zero,
// perform an absolute elliptical arc operation to coordinate (x+width,y+ry),
// where rx and ry are used as the equivalent parameters to the elliptical arc command,
// the x-axis-rotation and large-arc-flag are set to zero,
// the sweep-flag is set to one;
double x_axis_rotation = 0;
bool large_arc_flag = false;
bool sweep_flag = true;
if (rx > 0 && ry > 0)
path.elliptical_arc_to({ x + width, y + ry }, corner_radii, x_axis_rotation, large_arc_flag, sweep_flag);
// 4. perform an absolute vertical lineto parameter y+height-ry;
path.vertical_line_to(y + height - ry);
// 5. if both rx and ry are greater than zero,
// perform an absolute elliptical arc operation to coordinate (x+width-rx,y+height),
// using the same parameters as previously;
if (rx > 0 && ry > 0)
path.elliptical_arc_to({ x + width - rx, y + height }, corner_radii, x_axis_rotation, large_arc_flag, sweep_flag);
// 6. perform an absolute horizontal lineto parameter x+rx;
path.horizontal_line_to(x + rx);
// 7. if both rx and ry are greater than zero,
// perform an absolute elliptical arc operation to coordinate (x,y+height-ry),
// using the same parameters as previously;
if (rx > 0 && ry > 0)
path.elliptical_arc_to({ x, y + height - ry }, corner_radii, x_axis_rotation, large_arc_flag, sweep_flag);
// 8. perform an absolute vertical lineto parameter y+ry
path.vertical_line_to(y + ry);
// 9. if both rx and ry are greater than zero,
// perform an absolute elliptical arc operation with a segment-completing close path operation,
// using the same parameters as previously.
if (rx > 0 && ry > 0)
path.elliptical_arc_to({ x + rx, y }, corner_radii, x_axis_rotation, large_arc_flag, sweep_flag);
m_path = move(path);
return m_path.value();
}
Gfx::FloatPoint SVGRectElement::calculate_used_corner_radius_values()
{
// 1. Let rx and ry be length values.
float rx = 0;
float ry = 0;
// 2. If neither ‘rx’ nor ‘ry’ are properly specified, then set both rx and ry to 0. (This will result in square corners.)
if (!m_radius_x.has_value() && !m_radius_y.has_value()) {
rx = 0;
ry = 0;
}
// 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’.
else if (m_radius_x.has_value()) {
rx = m_radius_x.value();
ry = m_radius_x.value();
}
// 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’.
else if (m_radius_y.has_value()) {
rx = m_radius_y.value();
ry = m_radius_y.value();
}
// 5. Otherwise, both ‘rx’ and ‘ry’ were specified properly. Set rx to the value of ‘rx’ and ry to the value of ‘ry’.
else {
rx = m_radius_x.value();
ry = m_radius_y.value();
}
// 6. If rx is greater than half of ‘width’, then set rx to half of ‘width’.
auto half_width = m_width.value_or(0) / 2;
if (rx > half_width)
rx = half_width;
// 7. If ry is greater than half of ‘height’, then set ry to half of ‘height’.
auto half_height = m_height.value_or(0) / 2;
if (ry > half_height)
ry = half_height;
// 8. The effective values of ‘rx’ and ‘ry’ are rx and ry, respectively.
return Gfx::FloatPoint { rx, ry };
}
}