Cubic Bezier curve. More...

#include <polyver.h>

Inheritance diagram for a2dVpathCBCurveSegment:

Collaboration diagram for a2dVpathCBCurveSegment:

Public Member Functions
	a2dVpathCBCurveSegment (double x1, double y1, double x2, double y2, double x3, double y3, a2dPATHSEG type=a2dPATHSEG_CBCURVETO, a2dPATHSEG_END close=a2dPATHSEG_END_OPEN)
	constructor More...

	a2dVpathCBCurveSegment (a2dVpathSegmentPtr prev, double x1, double y1, double x3, double y3, a2dPATHSEG type=a2dPATHSEG_CBCURVETO, a2dPATHSEG_END close=a2dPATHSEG_END_OPEN)
	constructor More...

	a2dVpathCBCurveSegment (const a2dVpathCBCurveSegment &other)
	copy constructor

	~a2dVpathCBCurveSegment ()
	destructor

virtual a2dVpathSegment *	Clone ()
	create exact copy

virtual double	Length (a2dVpathSegmentPtr prev)
	calculate length

void	PositionAt (a2dVpathSegmentPtr prev, double t, double &xt, double &yt)
	calculate position at t, used for length

Public Member Functions inherited from a2dVpathSegment
	a2dVpathSegment (double x, double y, a2dPATHSEG type=a2dPATHSEG_LINETO, a2dPATHSEG_END close=a2dPATHSEG_END_OPEN)
	constructor More...

	a2dVpathSegment (const a2dVpathSegment &other)
	constructor

virtual	~a2dVpathSegment ()
	destructor

a2dPATHSEG	GetType () const
	easy way to test type of segment

bool	GetBin () const
	used in processing

void	SetBin (bool bin)
	used in processing

a2dPATHSEG_END	GetClose () const
	is this segment the closing a part since the last move

void	SetClose (a2dPATHSEG_END close)
	set this segment is closing a part since the last move

Public Attributes
double	m_x2
	control point 1

double	m_y2
	control point 1

double	m_x3
	control point 2

double	m_y3
	control point 2

Public Attributes inherited from a2dVpathSegment
double	m_x1
	x endpoint of line

double	m_y1
	y endpoint of line

bool	m_bin: 1
	Marker for walking over the segments.

a2dPATHSEG	m_type: 5
	easy way to test type of segment

a2dPATHSEG_END	m_close: 3
	is the path closing here or not

Detailed Description

Cubic Bezier curve.

Create a curved segment based on Cubic Bezier spline let P0 be end point of previous segment let P1 be inbetween point of this segment (m_x2, m_y2) let P2 be second inbetween point of this segment (m_x3, m_y3) let P3 be end point of this segment (m_x1, m_y1)

Then the formula describing points on the curve are:

For ( 0 <= t <= 1 ) Point(t) = (1-t)^3*P0 + 3*t*(1-t)^2*P1 + 3*t^2*(1-t)*P2 + t^3*P3

Definition at line 1045 of file polyver.h.

Constructor & Destructor Documentation

a2dVpathCBCurveSegment::a2dVpathCBCurveSegment	(	double	x1,
		double	y1,
		double	x2,
		double	y2,
		double	x3,
		double	y3,
		a2dPATHSEG	type = `a2dPATHSEG_CBCURVETO`,
		a2dPATHSEG_END	close = `a2dPATHSEG_END_OPEN`
	)

constructor

Parameters

x1	endpoint of curve
y1	endpoint of curve
x2	first control point coming from previous segment in path
y2	first control point coming from previous segment in path
x3	second control point coming from previous segment in path
y3	second control point coming from previous segment in path
type	draw or move towards point
close	if true close this path with the last move command/segment

Definition at line 3647 of file polyver.cpp.

a2dVpathCBCurveSegment::a2dVpathCBCurveSegment	(	a2dVpathSegmentPtr	prev,
		double	x1,
		double	y1,
		double	x3,
		double	y3,
		a2dPATHSEG	type = `a2dPATHSEG_CBCURVETO`,
		a2dPATHSEG_END	close = `a2dPATHSEG_END_OPEN`
	)

constructor

Parameters

prev	previous segment
x1	endpoint of curve
y1	endpoint of curve
x3	second control point coming from previous segment in path
y3	second control point coming from previous segment in path
type	draw or move towards point
close	if true close this path with the last move command/segment

Remarks: x2 first control point is mirror of second control point of previous segment in path, if Cubic else last endpoint; y2 first control point is mirror of second control point of previous segment in path, if Cubic else last endpoint

Definition at line 3662 of file polyver.cpp.

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

Public Member Functions

Public Attributes

Detailed Description

Constructor & Destructor Documentation