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ipe::Curve Class Reference
Ipe Geometry

`#include <ipeshape.h>`

Inherits ipe::SubPath.

## Public Member Functions
| Curve ()
virtual Type | type () const
virtual bool | closed () const
virtual const Curve * | asCurve () const
virtual void | save (Stream &stream) const
virtual void | draw (Painter &painter) const
virtual void | addToBBox (Rect &box, const Matrix &m, bool cp) const
virtual double | distance (const Vector &v, const Matrix &m, double bound) const
virtual void | snapVtx (const Vector &mouse, const Matrix &m, Vector &pos, double &bound, bool cp) const
virtual void | snapBnd (const Vector &mouse, const Matrix &m, Vector &pos, double &bound) const
int | countSegments () const
int | countSegmentsClosing () const
CurveSegment | segment (int i) const
CurveSegment | closingSegment () const
void | appendSegment (const Vector &v0, const Vector &v1)
void | appendArc (const Matrix &m, const Vector &v0, const Vector &v1)
void | appendSpline (const std::vector< Vector > &v)
void | appendOldSpline (const std::vector< Vector > &v)
void | appendCardinalSpline (const std::vector< Vector > &v, float tension)
void | appendSpiroSpline (const std::vector< Vector > &v)
void | appendSpiroSplinePrecomputed (const std::vector< Vector > &v, int sep)
void | setClosed (bool closed)
Public Member Functions inherited from ipe::SubPath
virtual | ~SubPath ()=0
virtual const Ellipse * | asEllipse () const
virtual const ClosedSpline * | asClosedSpline () const

## Friends
class | CurveSegment

## Additional Inherited Members
Public Types inherited from ipe::SubPath
enum | Type { ECurve , EEllipse , EClosedSpline }

## Detailed Description

Subpath consisting of a sequence of CurveSegment's.

## Constructor & Destructor Documentation

## ◆ Curve()

Curve::Curve | ( |  | ) |

Create an empty, open subpath.

## Member Function Documentation

## ◆ type()

SubPath::Type Curve::type | ( |  | ) | const
| virtual

Return type of this subpath.

Implements ipe::SubPath.

References ipe::SubPath::ECurve.

## ◆ closed()

virtual bool ipe::Curve::closed | ( |  | ) | const
| inline virtual

Is this subpath closed?

Default implementation returns `true`.

Reimplemented from ipe::SubPath.

Referenced by draw(), save(), setClosed(), and snapVtx().

## ◆ asCurve()

const Curve * Curve::asCurve | ( |  | ) | const
| virtual

Return this object as an Curve, or else nullptr.

Reimplemented from ipe::SubPath.

## ◆ save()

void Curve::save | ( | Stream & | stream | ) | const
| virtual

Save subpath to XML stream.

Implements ipe::SubPath.

References closed(), ipe::CurveSegment::EArc, ipe::CurveSegment::ECardinalSpline, ipe::CurveSegment::EOldSpline, ipe::CurveSegment::ESegment, ipe::CurveSegment::ESpiroSpline, and ipe::CurveSegment::ESpline.

## ◆ draw()

void Curve::draw | ( | Painter & | painter | ) | const
| virtual

Draw subpath (does not call drawPath()).

Implements ipe::SubPath.

References closed(), ipe::Painter::closePath(), countSegments(), ipe::CurveSegment::draw(), ipe::Painter::moveTo(), and segment().

## ◆ addToBBox()

void Curve::addToBBox | ( | Rect & | box,
|  | const Matrix & | m,
|  | bool | cp
| ) |  | const
| virtual

Add subpath to box.

Implements ipe::SubPath.

References ipe::CurveSegment::addToBBox(), countSegments(), and segment().

## ◆ distance()

double Curve::distance | ( | const Vector & | v,
|  | const Matrix & | m,
|  | double | bound
| ) |  | const
| virtual

Return distance from v to subpath transformed by m.

Implements ipe::SubPath.

References countSegmentsClosing(), ipe::CurveSegment::distance(), and segment().

## ◆ snapVtx()

void Curve::snapVtx | ( | const Vector & | mouse,
|  | const Matrix & | m,
|  | Vector & | pos,
|  | double & | bound,
|  | bool | cp
| ) |  | const
| virtual

Snap to vertex.

Implements ipe::SubPath.

References closed(), closingSegment(), countSegments(), segment(), and ipe::CurveSegment::snapVtx().

## ◆ snapBnd()

void Curve::snapBnd | ( | const Vector & | mouse,
|  | const Matrix & | m,
|  | Vector & | pos,
|  | double & | bound
| ) |  | const
| virtual

Snap to boundary of subpath.

Implements ipe::SubPath.

References countSegmentsClosing(), segment(), and ipe::CurveSegment::snapBnd().

## ◆ countSegments()

int ipe::Curve::countSegments | ( |  | ) | const
| inline

Return number of segments. This does not include the closing segment for a closed path.

Referenced by addToBBox(), draw(), ipe::Shape::isSegment(), ipe::Shape::load(), and snapVtx().

## ◆ countSegmentsClosing()

int ipe::Curve::countSegmentsClosing | ( |  | ) | const
| inline

Return number of segments including the closing segment.

Referenced by distance(), and snapBnd().

## ◆ segment()

CurveSegment Curve::segment | ( | int | i | ) | const

Return segment.

If i is negative, elements from the end are returned. If i == countSegments(), the closing segment of a closed path is returned.

References CurveSegment.

Referenced by addToBBox(), distance(), draw(), ipe::Path::draw(), ipe::Shape::isSegment(), snapBnd(), and snapVtx().

## ◆ closingSegment()

CurveSegment Curve::closingSegment | ( |  | ) | const

Returns the closing segment of a closed path.

This method panics if the Curve is not closed.

References CurveSegment.

Referenced by snapVtx().

## ◆ appendSegment()

void Curve::appendSegment | ( | const Vector & | v0,
|  | const Vector & | v1
| ) |  |

Append a straight segment to the subpath.

References ipe::CurveSegment::ESegment.

Referenced by ipe::Shape::load(), setClosed(), and ipe::Shape::Shape().

## ◆ appendArc()

void Curve::appendArc | ( | const Matrix & | m,
|  | const Vector & | v0,
|  | const Vector & | v1
| ) |  |

Append elliptic arc to the subpath.

References ipe::CurveSegment::EArc.

Referenced by ipe::Shape::load(), and ipe::Shape::Shape().

## ◆ appendSpline()

void ipe::Curve::appendSpline | ( | const std::vector< Vector > & | v | ) |
| inline

References ipe::CurveSegment::ESpline.

Referenced by appendCardinalSpline(), appendOldSpline(), and ipe::Shape::load().

## ◆ appendOldSpline()

void ipe::Curve::appendOldSpline | ( | const std::vector< Vector > & | v | ) |
| inline

References appendSpline(), and ipe::CurveSegment::EOldSpline.

Referenced by ipe::Shape::load().

## ◆ appendCardinalSpline()

void Curve::appendCardinalSpline | ( | const std::vector< Vector > & | v,
|  | float | tension
| ) |  |

Append a cardinal spline curve.

References appendSpline(), and ipe::CurveSegment::ECardinalSpline.

Referenced by ipe::Shape::load().

## ◆ appendSpiroSpline()

void Curve::appendSpiroSpline | ( | const std::vector< Vector > & | v | ) |

Append a spiro spline curve.

References ipe::CurveSegment::ESpiroSpline, ipe::size(), and ipe::Bezier::spiroSpline().

Referenced by ipe::Shape::load().

## ◆ appendSpiroSplinePrecomputed()

void Curve::appendSpiroSplinePrecomputed | ( | const std::vector< Vector > & | v,
|  | int | sep
| ) |  |

Append a spiro spline curve with precomputed Bezier control points.

References ipe::CurveSegment::ESpiroSpline, and ipe::size().

Referenced by ipe::Shape::load().

## ◆ setClosed()

void Curve::setClosed | ( | bool | closed | ) |

Set whether subpath is closed or not.

Must be called after all segments have been added to the path.

References appendSegment(), and closed().

Referenced by ipe::Shape::load(), and ipe::Shape::Shape().

## Friends And Related Function Documentation

## ◆ CurveSegment

friend class CurveSegment
| friend

Referenced by closingSegment(), and segment().

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

- ipeshape.h
- ipeshape.cpp