LineClip Class Reference

Line clipper. More...

#include <lineclip.hpp>

Public Member Functions
	LineClip (cairo_t *cairo)
	Construct line clipper. More...
	~LineClip ()
	Destructor. More...
void	set (double xmin, double ymin, double xmax, double ymax)
	Set clipping area. More...
void	reset ()
	Reset clip. More...
void	move_to (double x, double y)
	Move to (x,y) More...
void	line_to (double x, double y)
	Line to (x,y) More...
void	curve_to (double x1, double y1, double x2, double y2, double x3, double y3)
	Curve to (x,y) More...
void	close_path ()
	Close path. More...
void	fill ()
	Close path and fill enclosed area. More...

Detailed Description

Line clipper.

Cairo graphics coordinates are internally handled using fixed point algebra for speed. This causes problems in clipping algorithm when there are large scale differences in coordinates. This class is provided for the user to overcome this problem by using floating point algebra for line clipping.

Constructor & Destructor Documentation

LineClip()

LineClip::LineClip

(

cairo_t *

cairo

)

Construct line clipper.

~LineClip()

LineClip::~LineClip

(

)

Destructor.

Member Function Documentation

close_path()

void LineClip::close_path

(

)

Close path.

curve_to()

void LineClip::curve_to	(	double	x1,
		double	y1,
		double	x2,
		double	y2,
		double	x3,
		double	y3
	)

Curve to (x,y)

Curve is drawn with lines in cairo. Number is subdivisions is made large enough to contain the error at typically less than 1 pixel.

fill()

void LineClip::fill

(

)

Close path and fill enclosed area.

line_to()

void LineClip::line_to	(	double	x,
		double	y
	)

Line to (x,y)

move_to()

void LineClip::move_to	(	double	x,
		double	y
	)

Move to (x,y)

reset()

void LineClip::reset

(

)

Reset clip.

Sets clip limits to infinity and forgets last coordinate.

set()

void LineClip::set	(	double	xmin,
		double	ymin,
		double	xmax,
		double	ymax
	)

Set clipping area.

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The documentation for this class was generated from the following files:

• lineclip.hpp
• lineclip.cpp