a2dArcSegment Class Reference
[vector path a2dCanvasObject plus segment classes]

Arc Segment in a2dVertexList. More...

#include <polyver.h>

Inheritance diagram for a2dArcSegment:

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Collaboration diagram for a2dArcSegment:

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List of all members.

Public Member Functions
	a2dArcSegment (double x1=0, double y1=0, double x2=0, double y2=0)
	create arc segment
	a2dArcSegment (const a2dLineSegment &prev, double xc, double yc, double angle)
	create arc segment
	a2dArcSegment (const a2dLineSegment &prev, double xc, double yc, double x1, double y1, double x2, double y2)
	create arc segment
	a2dArcSegment (const a2dArcSegment &other)
	copy constructor
	~a2dArcSegment ()
	destructor
virtual a2dLineSegment *	Clone ()
	create exact copy
bool	CalcR (const a2dLineSegment &prev, double &radius, double &center_x, double &center_y, double &beginrad, double &midrad, double &endrad, double &phit) const
	Calculation of center for the Arc.
virtual double	Length (const a2dLineSegment &prev)
	calculate length
void	CalcMidPoint (const a2dLineSegment &prev, double center_x, double center_y, double radius, bool clockwise)
	calculate new mid point bsed on prev segment radius and center.
a2dPoint2D	GetMidPoint () const
	get middle on arc segment between end and start
void	SetMidPoint (const a2dLineSegment &prev, double xm, double ym)
	set middle point of arc segment
double	GetOx (const a2dLineSegment &prev) const
	Get origin X of arc.
double	GetOy (const a2dLineSegment &prev) const
	Get origin Y of arc.
a2dPoint2D	GetOrigin (const a2dLineSegment &prev) const
	Get origin of arc.
a2dBoundingBox	GetBbox (const a2dLineSegment &prev, const a2dAffineMatrix &lworld=a2dIDENTITY_MATRIX) const
	Get bounding box of arc.
Public Attributes
double	m_x2
	x2 x of arc midpoint
double	m_y2
	y2 y of arc midpoint

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Detailed Description

Arc Segment in a2dVertexList.

Create an circular Arc segment. From the previous segment to this segment position, create an arc passing through a thrid point. The Third point defines the Arc segment going clockwise or anticlockwise from begin to end point.

Definition at line 366 of file polyver.h.

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Constructor & Destructor Documentation

a2dArcSegment::a2dArcSegment	(	double	x1 = 0,
		double	y1 = 0,
		double	x2 = 0,
		double	y2 = 0
	)

create arc segment

Begin point of arc is position/endpoint of previous segment

Parameters:

	x1	x of arc endpoint
	y1	y of arc endpoint
	x2	x of arc midpoint
	y2	y of arc midpoint

Definition at line 299 of file polyver.cpp.

a2dArcSegment::a2dArcSegment	(	const a2dLineSegment &	prev,
		double	xc,
		double	yc,
		double	angle
	)

create arc segment

Begin point of arc is position/endpoint of previous segment

Parameters:

	prev	previous segment
	xc	x of arc center
	yc	y of arc center
	angle	angle of arc in degrees relative from the previous segment endpoint (negatif for clockwise)

Definition at line 307 of file polyver.cpp.

a2dArcSegment::a2dArcSegment	(	const a2dLineSegment &	prev,
		double	xc,
		double	yc,
		double	x1,
		double	y1,
		double	x2,
		double	y2
	)

create arc segment

Begin point of arc is position/endpoint of previous segment

Parameters:

	prev	previous segment
	xc	x of arc center
	yc	y of arc center
	x1	x of arc endpoint
	y1	y of arc endpoint
	x2	x (xc,yc) ( x2,y2) define a line which the arc will cross
	y2	y (xc,yc) ( x2,y2) define a line which the arc will cross

Remarks:

radius is defined by prev segment endpoint and (xc,yc), x1,y1 is adjusted to fit radius.

Definition at line 325 of file polyver.cpp.

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Member Function Documentation

bool a2dArcSegment::CalcR	(	const a2dLineSegment &	prev,
		double &	radius,
		double &	center_x,
		double &	center_y,
		double &	beginrad,
		double &	midrad,
		double &	endrad,
		double &	phit
	)			const

Calculation of center for the Arc.

output :

Parameters:

	prev	the previous segment, to get start point of arc.
	radius	radius of the circle calculated
	center_x	x of the center calculated
	center_y	y of the center calculated
	beginrad	calculated starting angle in radians
	midrad	calculated middle angle in radians
	endrad	calculated end angle in radians
	phit	total calculated in radians (AntiClockwise positif, else negatif )

Returns:

true if the arc is indeed an Arc if a straight line return false.

Definition at line 408 of file polyver.cpp.

void a2dArcSegment::CalcMidPoint	(	const a2dLineSegment &	prev,
		double	center_x,
		double	center_y,
		double	radius,
		bool	clockwise
	)

calculate new mid point bsed on prev segment radius and center.

Parameters:

	prev	the previous segment, to get start point of arc.
	radius	radius of the circle calculated
	center_x	x of the center calculated
	center_y	y of the center calculated
	clockwise	if true a clockwise arc segment is assumed for creating the mid point

Definition at line 386 of file polyver.cpp.

void a2dArcSegment::SetMidPoint	(	const a2dLineSegment &	prev,
		double	xm,
		double	ym
	)

set middle point of arc segment

Parameters:

	prev	the previous segment, to get start point of arc.
	xm	x of middle point
	ym	y of middle point

Definition at line 359 of file polyver.cpp.

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

• polyver.h
• polyver.cpp