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LibGfx: Implement filling paths

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There are some imperfections with intersecting edges (because the main
algorithm used is scanline, and that is not geared towards drawing
complex shapes), however, it behaves mostly fine for normal use :^)
This commit is contained in:
AnotherTest 2020-05-06 11:55:12 +04:30 • committed by Andreas Kling
parent 4d20cf57db
commit f54b41f748
5 changed files with 274 additions and 8 deletions
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24
Libraries/LibGfx/Path.h
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@ -57,21 +57,45 @@ public:
void line_to(const FloatPoint& point)
{
m_segments.append({ Segment::Type::LineTo, point });
invalidate_split_lines();
}
void quadratic_bezier_curve_to(const FloatPoint& through, const FloatPoint& point)
{
m_segments.append({ Segment::Type::QuadraticBezierCurveTo, point, through });
invalidate_split_lines();
}
void close();
const Vector<Segment>& segments() const { return m_segments; }
const auto& split_lines()
{
if (m_split_lines.has_value())
return m_split_lines.value();
segmentize_path();
ASSERT(m_split_lines.has_value());
return m_split_lines.value();
}
String to_string() const;
struct LineSegment {
Point from, to;
float inverse_slope;
float x_of_minimum_y;
float maximum_y;
float minimum_y;
float x;
};
private:
void invalidate_split_lines() { m_split_lines.clear(); }
void segmentize_path();
Vector<Segment> m_segments;
Optional<Vector<LineSegment>> m_split_lines {};
};
inline const LogStream& operator<<(const LogStream& stream, const Path& path)