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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <AK/Function.h>
#include <AK/HashTable.h>
#include <AK/QuickSort.h>
#include <AK/StringBuilder.h>
#include <LibGfx/Painter.h>
#include <LibGfx/Path.h>
namespace Gfx {
void Path::close()
{
if (m_segments.size() <= 1)
return;
invalidate_split_lines();
auto& last_point = m_segments.last().point();
for (ssize_t i = m_segments.size() - 1; i >= 0; --i) {
auto& segment = m_segments[i];
if (segment.type() == Segment::Type::MoveTo) {
if (last_point == segment.point())
return;
append_segment<LineSegment>(segment.point());
return;
}
}
}
void Path::close_all_subpaths()
{
if (m_segments.size() <= 1)
return;
invalidate_split_lines();
Optional<FloatPoint> cursor, start_of_subpath;
bool is_first_point_in_subpath { false };
for (auto& segment : m_segments) {
switch (segment.type()) {
case Segment::Type::MoveTo: {
if (cursor.has_value() && !is_first_point_in_subpath) {
// This is a move from a subpath to another
// connect the two ends of this subpath before
// moving on to the next one
VERIFY(start_of_subpath.has_value());
append_segment<MoveSegment>(cursor.value());
append_segment<LineSegment>(start_of_subpath.value());
}
is_first_point_in_subpath = true;
cursor = segment.point();
break;
}
case Segment::Type::LineTo:
case Segment::Type::QuadraticBezierCurveTo:
case Segment::Type::EllipticalArcTo:
if (is_first_point_in_subpath) {
start_of_subpath = cursor;
is_first_point_in_subpath = false;
}
cursor = segment.point();
break;
case Segment::Type::Invalid:
VERIFY_NOT_REACHED();
break;
}
}
}
String Path::to_string() const
{
StringBuilder builder;
builder.append("Path { ");
for (auto& segment : m_segments) {
switch (segment.type()) {
case Segment::Type::MoveTo:
builder.append("MoveTo");
break;
case Segment::Type::LineTo:
builder.append("LineTo");
break;
case Segment::Type::QuadraticBezierCurveTo:
builder.append("QuadraticBezierCurveTo");
break;
case Segment::Type::EllipticalArcTo:
builder.append("EllipticalArcTo");
break;
case Segment::Type::Invalid:
builder.append("Invalid");
break;
}
builder.appendf("(%s", segment.point().to_string().characters());
switch (segment.type()) {
case Segment::Type::QuadraticBezierCurveTo:
builder.append(", ");
builder.append(static_cast<const QuadraticBezierCurveSegment&>(segment).through().to_string());
break;
case Segment::Type::EllipticalArcTo: {
auto& arc = static_cast<const EllipticalArcSegment&>(segment);
builder.appendf(", %s, %s, %f, %f, %f",
arc.radii().to_string().characters(),
arc.center().to_string().characters(),
arc.x_axis_rotation(),
arc.theta_1(),
arc.theta_delta());
break;
}
default:
break;
}
builder.append(") ");
}
builder.append("}");
return builder.to_string();
}
void Path::segmentize_path()
{
Vector<SplitLineSegment> segments;
float min_x = 0;
float min_y = 0;
float max_x = 0;
float max_y = 0;
auto add_point_to_bbox = [&](const Gfx::FloatPoint& point) {
float x = point.x();
float y = point.y();
min_x = min(min_x, x);
min_y = min(min_y, y);
max_x = max(max_x, x);
max_y = max(max_y, y);
};
auto add_line = [&](const auto& p0, const auto& p1) {
float ymax = p0.y(), ymin = p1.y(), x_of_ymin = p1.x(), x_of_ymax = p0.x();
auto slope = p0.x() == p1.x() ? 0 : ((float)(p0.y() - p1.y())) / ((float)(p0.x() - p1.x()));
if (p0.y() < p1.y()) {
swap(ymin, ymax);
swap(x_of_ymin, x_of_ymax);
}
segments.append({ FloatPoint(p0.x(), p0.y()),
FloatPoint(p1.x(), p1.y()),
slope == 0 ? 0 : 1 / slope,
x_of_ymin,
ymax, ymin, x_of_ymax });
add_point_to_bbox(p1);
};
FloatPoint cursor { 0, 0 };
bool first = true;
for (auto& segment : m_segments) {
switch (segment.type()) {
case Segment::Type::MoveTo:
if (first) {
min_x = segment.point().x();
min_y = segment.point().y();
max_x = segment.point().x();
max_y = segment.point().y();
} else {
add_point_to_bbox(segment.point());
}
cursor = segment.point();
break;
case Segment::Type::LineTo: {
add_line(cursor, segment.point());
cursor = segment.point();
break;
}
case Segment::Type::QuadraticBezierCurveTo: {
auto& control = static_cast<QuadraticBezierCurveSegment&>(segment).through();
Painter::for_each_line_segment_on_bezier_curve(control, cursor, segment.point(), [&](const FloatPoint& p0, const FloatPoint& p1) {
add_line(p0, p1);
});
cursor = segment.point();
break;
}
case Segment::Type::EllipticalArcTo: {
auto& arc = static_cast<EllipticalArcSegment&>(segment);
Painter::for_each_line_segment_on_elliptical_arc(cursor, arc.point(), arc.center(), arc.radii(), arc.x_axis_rotation(), arc.theta_1(), arc.theta_delta(), [&](const FloatPoint& p0, const FloatPoint& p1) {
add_line(p0, p1);
});
cursor = segment.point();
break;
}
case Segment::Type::Invalid:
VERIFY_NOT_REACHED();
}
first = false;
}
// sort segments by ymax
quick_sort(segments, [](const auto& line0, const auto& line1) {
return line1.maximum_y < line0.maximum_y;
});
m_split_lines = move(segments);
m_bounding_box = Gfx::FloatRect { min_x, min_y, max_x - min_x, max_y - min_y };
}
}
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