Inkscape: Geom::CairoPathSink Class Reference

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Output paths to a Cairo drawing context. More...

#include <cairo-path-sink.h>

Inheritance diagram for Geom::CairoPathSink:

Public Member Functions
	CairoPathSink (cairo_t *cr)

void	moveTo (Point const &p) override
	Move to a different point without creating a segment.

void	lineTo (Point const &p) override
	Output a line segment.

void	curveTo (Point const &c0, Point const &c1, Point const &p) override
	Output a quadratic Bezier segment.

void	quadTo (Point const &c, Point const &p) override
	Output a cubic Bezier segment.

void	arcTo (Coord rx, Coord ry, Coord angle, bool large_arc, bool sweep, Point const &p) override
	Output an elliptical arc segment.

void	closePath () override
	Close the current path with a line segment.

void	flush () override
	Flush any internal state of the generator.

Public Member Functions inherited from Geom::PathSink
virtual bool	backspace ()
	Undo the last segment.

virtual void	feed (Curve const &c, bool moveto_initial=true)

virtual void	feed (Path const &p)
	Output a subpath.

virtual void	feed (PathVector const &v)
	Output a path.

virtual void	feed (Rect const &)
	Output an axis-aligned rectangle, using moveTo, lineTo and closePath.

virtual void	feed (Circle const &e)
	Output a circle as two elliptical arcs.

virtual void	feed (Ellipse const &e)
	Output an ellipse as two elliptical arcs.

virtual	~PathSink ()

Private Attributes
cairo_t *	_cr

Point	_current_point

Detailed Description

Output paths to a Cairo drawing context.

This class converts from 2Geom path representation to the Cairo representation. Use it to simplify visualizing the results of 2Geom operations with the Cairo library, for example:

CairoPathSink sink(cr);
sink.feed(pv);
cairo_stroke(cr);

Currently the flush method is a no-op, but this is not guaranteed to hold forever.

Definition at line 57 of file cairo-path-sink.h.

Constructor & Destructor Documentation

◆ CairoPathSink()

Geom::CairoPathSink::CairoPathSink ( cairo_t * cr )

Definition at line 40 of file cairo-path-sink.cpp.

Member Function Documentation

◆ arcTo()

void Geom::CairoPathSink::arcTo	(	Coord	rx,
		Coord	ry,
		Coord	angle,
		bool	large_arc,
		bool	sweep,
		Point const &	p
	)

overridevirtual

Output an elliptical arc segment.

See the EllipticalArc class for the documentation of parameters.

Implements Geom::PathSink.

Definition at line 73 of file cairo-path-sink.cpp.

References _cr, _current_point, Geom::EllipticalArc::finalAngle(), Geom::EllipticalArc::initialAngle(), and Geom::EllipticalArc::unitCircleTransform().

◆ closePath()

void Geom::CairoPathSink::closePath ( )

overridevirtual

Close the current path with a line segment.

Implements Geom::PathSink.

Definition at line 107 of file cairo-path-sink.cpp.

References _cr.

◆ curveTo()

void Geom::CairoPathSink::curveTo	(	Point const &	c0,
		Point const &	c1,
		Point const &	p
	)

overridevirtual

Output a quadratic Bezier segment.

Implements Geom::PathSink.

Definition at line 56 of file cairo-path-sink.cpp.

References _cr, _current_point, cairo_curve_to(), Geom::X, and Geom::Y.

◆ flush()

void Geom::CairoPathSink::flush ( )

overridevirtual

Flush any internal state of the generator.

This call should implicitly finish the current subpath. Calling this method should be idempotent, because the default implementations of path() and pathvector() will call it multiple times in a row.

Implements Geom::PathSink.

Definition at line 112 of file cairo-path-sink.cpp.