a2dVpathQBCurveSegment Class Reference
[vector path a2dCanvasObject plus segment classes]

Quadratic Bezier curve. More...

#include <polyver.h>

Inheritance diagram for a2dVpathQBCurveSegment:

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Collaboration diagram for a2dVpathQBCurveSegment:

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List of all members.

Public Member Functions
	a2dVpathQBCurveSegment (double x1, double y1, double x2, double y2, a2dPATHSEG type=a2dPATHSEG_QBCURVETO, a2dPATHSEG_END close=a2dPATHSEG_END_OPEN)
	constructor
	a2dVpathQBCurveSegment (const a2dVpathSegment &prev, double x1, double y1, a2dPATHSEG type=a2dPATHSEG_QBCURVETO, a2dPATHSEG_END close=a2dPATHSEG_END_OPEN)
	constructor
	a2dVpathQBCurveSegment (const a2dVpathQBCurveSegment &other)
	copy constructor
	~a2dVpathQBCurveSegment ()
	destructor
virtual a2dVpathSegment *	Clone ()
	create exact copy
virtual double	Length (const a2dVpathSegment &prev)
	calculate length
void	PositionAt (const a2dVpathSegment &prev, double t, double &xt, double &yt)
	calculate position at t, used for length
Public Attributes
double	m_x2
	control point
double	m_y2
	control point

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Detailed Description

Quadratic Bezier curve.

Create a curved segment based on qaudratic 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 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)^2*P0 + 2*t*(1-t)*P1 + t^2*P2

Definition at line 941 of file polyver.h.

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Constructor & Destructor Documentation

a2dVpathQBCurveSegment::a2dVpathQBCurveSegment	(	double	x1,
		double	y1,
		double	x2,
		double	y2,
		a2dPATHSEG	type = a2dPATHSEG_QBCURVETO,
		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
	type	draw or move towards point
	close	if true close this path with the last move command/segment

Definition at line 3549 of file polyver.cpp.

a2dVpathQBCurveSegment::a2dVpathQBCurveSegment	(	const a2dVpathSegment &	prev,
		double	x1,
		double	y1,
		a2dPATHSEG	type = a2dPATHSEG_QBCURVETO,
		a2dPATHSEG_END	close = a2dPATHSEG_END_OPEN
	)

constructor

Parameters:

	prev	previous segment
	x1	endpoint of curve
	y1	endpoint of curve
	type	draw or move towards point
	close	if true close this path with the last move command/segment

Definition at line 3561 of file polyver.cpp.

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

• polyver.h
• polyver.cpp