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IpeBezier Class Reference
[Ipe Geometry]

A cubic Bezier spline. More...

List of all members.

Public Member Functions

Static Public Member Functions

Public Attributes


Detailed Description

A cubic Bezier spline.


Constructor & Destructor Documentation

IpeBezier::IpeBezier  )  [inline]
 

Default constructor, uninitialized curve.

IpeBezier::IpeBezier const IpeVector p0,
const IpeVector p1,
const IpeVector p2,
const IpeVector p3
[inline]
 

Constructor with four control points.


Member Function Documentation

IpeVector IpeBezier::Point double  t  )  const
 

Return point on curve with parameter t (from 0.0 to 1.0).

double IpeBezier::Distance const IpeVector v,
double  bound
 

Return distance to Bezier spline.

But may just return bound if actual distance is larger.

bool IpeBezier::Straight double  precision  )  const
 

Returns true if the Bezier curve is nearly identical to the line segment iV[0]..iV[3].

void IpeBezier::Subdivide IpeBezier l,
IpeBezier r
const
 

Subdivide this Bezier curve in the middle.

void IpeBezier::Approximate double  precision,
std::vector< IpeVector > &  result
const
 

Approximate by a polygonal chain.

result must be empty when calling this.

IpeRect IpeBezier::BBox  )  const
 

Return a tight bounding box (accurate to within 0.5).

IpeBezier IpeBezier::QuadBezier const IpeVector p0,
const IpeVector p1,
const IpeVector p2
[static]
 

Convert a quadratic Bezier-spline to a cubic one.

The quadratic Bezier-spline with control points p0, p1, p2 is identical to the cubic Bezier-spline with control points q0 = p0, q1 = (2p1 + p0)/3, q2 = (2p1 + p2)/3, q3 = p2.

void IpeBezier::Spline int  n,
const IpeVector v,
std::vector< IpeBezier > &  result
[static]
 

Convert a uniform cubic B-spline to a series of Bezier splines.

First and last control point are given multiplicity 3. Bezier splines are appended to result.

void IpeBezier::ClosedSpline int  n,
const IpeVector v,
std::vector< IpeBezier > &  result
[static]
 

Convert a closed uniform cubic B-spline to a series of Bezier splines.

Bezier splines are appended to result.


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