Ipelib: ipe::Path Class Reference

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Public Member Functions | Static Public Member Functions | List of all members
ipe::Path Class Reference
Ipe Objects

`#include <ipepath.h>`

Inherits ipe::Object.

## Public Member Functions
| Path (const AllAttributes &attr, const Shape &shape, bool withArrows=false)
virtual Object * | clone () const
virtual Path * | asPath ()
virtual Type | type () const
void | setPathMode (TPathMode pm)
void | setStroke (Attribute stroke)
void | setFill (Attribute fill)
void | setPen (Attribute pen)
void | setDashStyle (Attribute dash)
void | setLineCap (TLineCap s)
void | setLineJoin (TLineJoin s)
void | setFillRule (TFillRule s)
void | setOpacity (Attribute opaq)
void | setTiling (Attribute a)
void | setGradient (Attribute a)
Attribute | opacity () const
Attribute | tiling () const
Attribute | gradient () const
TPathMode | pathMode () const
Attribute | stroke () const
Attribute | fill () const
Attribute | pen () const
Attribute | dashStyle () const
TLineCap | lineCap () const
TLineJoin | lineJoin () const
TFillRule | fillRule () const
virtual void | saveAsXml (Stream &stream, String layer) const
virtual void | draw (Painter &painter) const
virtual void | drawSimple (Painter &painter) const
virtual void | accept (Visitor &visitor) 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) const
virtual void | snapCtl (const Vector &mouse, const Matrix &m, Vector &pos, double &bound) const
virtual void | snapBnd (const Vector &mouse, const Matrix &m, Vector &pos, double &bound) const
virtual void | checkStyle (const Cascade *sheet, AttributeSeq &seq) const
virtual bool | setAttribute (Property prop, Attribute value)
virtual Attribute | getAttribute (Property prop) const noexcept
bool | arrow () const
bool | rArrow () const
Attribute | arrowShape () const
Attribute | rArrowShape () const
Attribute | arrowSize () const
Attribute | rArrowSize () const
void | setArrow (bool arrow, Attribute shape, Attribute size)
void | setRarrow (bool arrow, Attribute shape, Attribute size)
const Shape & | shape () const
void | setShape (const Shape &shape)
Public Member Functions inherited from ipe::Object
virtual | ~Object ()=0
virtual Group * | asGroup ()
virtual const Group * | asGroup () const
virtual Text * | asText ()
virtual Image * | asImage ()
virtual Reference * | asReference ()
virtual TPinned | pinned () const
void | setPinned (TPinned pin)
TTransformations | transformations () const
void | setTransformations (TTransformations trans)
void | setMatrix (const Matrix &matrix)
const Matrix & | matrix () const

## Static Public Member Functions
static Path * | create (const XmlAttributes &attr, String data)
static void | drawArrow (Painter &painter, Vector pos, Angle alpha, Attribute shape, Attribute size, double radius)

## Additional Inherited Members
Public Types inherited from ipe::Object
enum | Type { EGroup, EPath, EText, EImage, EReference }
Protected Member Functions inherited from ipe::Object
| Object ()
| Object (const AllAttributes &attr)
| Object (const Object &rhs)
| Object (const XmlAttributes &attr)
void | saveAttributesAsXml (Stream &stream, String layer) const
Static Protected Member Functions inherited from ipe::Object
static void | checkSymbol (Kind kind, Attribute attr, const Cascade *sheet, AttributeSeq &seq)
Protected Attributes inherited from ipe::Object
Matrix | iMatrix
TPinned | iPinned: 8
TTransformations | iTransformations: 8

## Detailed Description

The path object (polylines, polygons, and generalizations).

This object represents any vector graphics. The geometry is contained in a Shape.

The filling algorithm is the even-odd rule of PDF: To determine whether a point lies inside the filled shape, draw a ray from that point in any direction, and count the number of path segments that cross the ray. If this number is odd, the point is inside; if even, the point is outside. (Path objects can also render using the winding fill rule by setting the fillRule attribute. This isn't really supported by the Ipe user interface, which doesn't show the orientation of paths.)

If the path consists of a single line segment and is filled only, then it is not drawn at all. This can be used to draw arrow heads without bodies. The fill color is used to draw the arrows in this case.

## Constructor & Destructor Documentation

Path::Path | ( | const AllAttributes & | attr,
|  | const Shape & | shape,
|  | bool | withArrows = `false`
| ) |  |
| explicit

Create for given shape.

Referenced by clone(), and shape().

## Member Function Documentation

Path * Path::create | ( | const XmlAttributes & | attr,
|  | String | data
| ) |  |
| static

Construct from XML data.

Object * Path::clone | ( |  | ) | const
| virtual

Return a clone (constant-time).

Implements ipe::Object.

References ipe::SubPath::asCurve(), ipe::SubPath::closed(), ipe::CurveSegment::countCP(), ipe::Shape::countSubPaths(), ipe::CurveSegment::cp(), ipe::CurveSegment::EArc, ipe::Matrix::inverse(), ipe::CurveSegment::last(), ipe::Matrix::linear(), ipe::CurveSegment::matrix(), Path(), ipe::Curve::segment(), ipe::Shape::subPath(), and ipe::CurveSegment::type().

Path * Path::asPath | ( |  | ) |
| virtual

Return pointer to this object.

Reimplemented from ipe::Object.

Object::Type Path::type | ( |  | ) | const
| virtual

Implements ipe::Object.

References ipe::Object::EPath.

void Path::setPathMode | ( | TPathMode | pm | ) |

Set whether object will be stroked and filled.

Referenced by setAttribute().

void Path::setStroke | ( | Attribute | stroke | ) |

Set stroke color.

References stroke().

Referenced by setAttribute().

void Path::setFill | ( | Attribute | fill | ) |

Set fill color.

References fill().

Referenced by setAttribute().

void Path::setPen | ( | Attribute | pen | ) |

Set pen.

References pen().

Referenced by setAttribute().

void Path::setDashStyle | ( | Attribute | dash | ) |

Set dash style.

Referenced by setAttribute().

void Path::setLineCap | ( | TLineCap | s | ) |

Set line cap style.

void Path::setLineJoin | ( | TLineJoin | s | ) |

Set line join style.

void Path::setFillRule | ( | TFillRule | s | ) |

Set fill rule.

void Path::setOpacity | ( | Attribute | opaq | ) |

Set opacity of the object.

Referenced by setAttribute().

void Path::setTiling | ( | Attribute | til | ) |

Set tiling pattern of the object.

Resets gradient fill.

References ipe::Attribute::NORMAL().

Referenced by setAttribute().

void Path::setGradient | ( | Attribute | grad | ) |

Set gradient fill of the object.

Resets tiling pattern.

References ipe::Attribute::NORMAL().

Referenced by setAttribute().

Attribute ipe::Path::opacity | ( |  | ) | const
| inline

Return opacity of the opject.

Referenced by getAttribute(), and setAttribute().

Attribute ipe::Path::tiling | ( |  | ) | const
| inline

Return tiling pattern.

Referenced by getAttribute(), and setAttribute().

Attribute ipe::Path::gradient | ( |  | ) | const
| inline

Return gradient fill.

References accept(), addToBBox(), arrow(), arrowShape(), arrowSize(), checkStyle(), dashStyle(), distance(), draw(), drawArrow(), drawSimple(), fill(), fillRule(), getAttribute(), lineCap(), lineJoin(), pathMode(), pen(), rArrow(), rArrowShape(), rArrowSize(), saveAsXml(), setArrow(), setAttribute(), setRarrow(), snapBnd(), snapCtl(), snapVtx(), and stroke().

Referenced by getAttribute(), and setAttribute().

TPathMode ipe::Path::pathMode | ( |  | ) | const
| inline

Is the object stroked and filled?

Referenced by gradient(), and setAttribute().

Attribute ipe::Path::stroke | ( |  | ) | const
| inline

Return stroke color.

Referenced by getAttribute(), gradient(), setAttribute(), and setStroke().

Attribute ipe::Path::fill | ( |  | ) | const
| inline

Return object fill color.

Referenced by getAttribute(), gradient(), setAttribute(), and setFill().

Attribute ipe::Path::pen | ( |  | ) | const
| inline

Return object pen.

Referenced by getAttribute(), gradient(), setAttribute(), and setPen().

Attribute ipe::Path::dashStyle | ( |  | ) | const
| inline

Return object line style.

Referenced by getAttribute(), gradient(), and setAttribute().

TLineCap ipe::Path::lineCap | ( |  | ) | const
| inline

Return line cap style.

Referenced by draw(), and gradient().

TLineJoin ipe::Path::lineJoin | ( |  | ) | const
| inline

Return line join style.

Referenced by draw(), and gradient().

TFillRule ipe::Path::fillRule | ( |  | ) | const
| inline

Return fill rule.

Referenced by draw(), and gradient().

void Path::saveAsXml | ( | Stream & | stream,
|  | String | layer
| ) |  | const
| virtual

Save the object in XML format.

Implements ipe::Object.

References ipe::EDefaultCap, ipe::EDefaultJoin, ipe::EEvenOddRule, ipe::EStrokedAndFilled, ipe::EWindRule, ipe::Attribute::isNormal(), ipe::Attribute::OPAQUE(), ipe::Shape::save(), ipe::Object::saveAttributesAsXml(), ipe::String::size(), ipe::Attribute::string(), and ipe::String::substr().

Referenced by gradient().

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

Draw the object.

Implements ipe::Object.

References ipe::Attribute::ARROW_ARC(), ipe::Attribute::ARROW_FARC(), ipe::SubPath::asCurve(), ipe::Shape::draw(), drawArrow(), ipe::Painter::drawPath(), ipe::EFilledOnly, ipe::EStrokedAndFilled, ipe::EStrokedOnly, fillRule(), ipe::Attribute::isArcArrow(), ipe::Attribute::isNormal(), ipe::Shape::isSegment(), ipe::Matrix::linear(), lineCap(), lineJoin(), ipe::CurveSegment::matrix(), ipe::Object::matrix(), ipe::Painter::matrix(), ipe::Painter::newPath(), ipe::Painter::pop(), ipe::Painter::popMatrix(), ipe::Painter::push(), ipe::Painter::pushMatrix(), ipe::Curve::segment(), ipe::Painter::setDashStyle(), ipe::Painter::setFill(), ipe::Painter::setFillRule(), ipe::Painter::setGradient(), ipe::Painter::setLineCap(), ipe::Painter::setLineJoin(), ipe::Painter::setOpacity(), ipe::Painter::setPen(), ipe::Painter::setStroke(), ipe::Painter::setTiling(), ipe::Shape::subPath(), ipe::Painter::transform(), ipe::Object::transformations(), ipe::Matrix::translation(), and ipe::Painter::untransform().

Referenced by gradient().

void Path::drawSimple | ( | Painter & | painter | ) | const
| virtual

Draw simple version for selecting and transforming.

Implements ipe::Object.

References ipe::Shape::draw(), ipe::Painter::drawPath(), ipe::EStrokedOnly, ipe::Object::matrix(), ipe::Painter::newPath(), ipe::Painter::popMatrix(), ipe::Painter::pushMatrix(), ipe::Painter::transform(), ipe::Object::transformations(), and ipe::Painter::untransform().

Referenced by gradient().

void Path::accept | ( | Visitor & | visitor | ) | const
| virtual

Call visitPath of visitor.

Implements ipe::Object.

References ipe::Visitor::visitPath().

Referenced by gradient().

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

Extend box to include the object transformed by m.

For objects in a page, don't call this directly. The Page caches the bounding box of each object, so it is far more efficient to call Page::bbox.

Control points that lie outside the visual object are included if cp is true.

If called with an empty box and cp == `false`, the result of this function is a tight bounding box for the object, with a little leeway in case the boundary is determined by a spline (it has to be approximated to perform this operation).

Implements ipe::Object.

References ipe::Shape::addToBBox(), and ipe::Object::matrix().

Referenced by gradient().

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

Return distance of transformed object to point v. If larger than bound, can just return bound.

Implements ipe::Object.

References ipe::Shape::distance(), and ipe::Object::matrix().

Referenced by gradient().

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

Compute vertex snapping position for transformed object.

Looks only for positions closer than bound. If successful, modify pos and bound. The default implementation does nothing.

Reimplemented from ipe::Object.

References ipe::Object::matrix(), and ipe::Shape::snapVtx().

Referenced by gradient().

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

Compute control point snapping position for transformed object.

Looks only for positions closer than bound. If successful, modify pos and bound. The default implementation does nothing.

Reimplemented from ipe::Object.

References ipe::Object::matrix(), and ipe::Shape::snapVtx().

Referenced by gradient().

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

Compute boundary snapping position for transformed object.

Looks only for positions closer than bound. If successful, modify pos and bound. The default implementation does nothing.

Reimplemented from ipe::Object.

References ipe::Object::matrix(), and ipe::Shape::snapBnd().

Referenced by gradient().

void Path::checkStyle | ( | const Cascade * | sheet,
|  | AttributeSeq & | seq
| ) |  | const
| virtual

Check all symbolic attributes.

Reimplemented from ipe::Object.

References ipe::Object::checkSymbol(), ipe::EArrowSize, ipe::EColor, ipe::EDashStyle, ipe::EGradient, ipe::EOpacity, ipe::EPen, ipe::ESymbol, ipe::ETiling, and ipe::Attribute::isNormal().

Referenced by gradient().

bool Path::setAttribute | ( | Property | prop,
|  | Attribute | value
| ) |  |
| virtual

Set an attribute on this object.

Returns true if an attribute was actually changed.

Reimplemented from ipe::Object.

References ipe::Attribute::boolean(), dashStyle(), ipe::EPropDashStyle, ipe::EPropFArrow, ipe::EPropFArrowShape, ipe::EPropFArrowSize, ipe::EPropFillColor, ipe::EPropFillRule, ipe::EPropGradient, ipe::EPropLineCap, ipe::EPropLineJoin, ipe::EPropOpacity, ipe::EPropPathMode, ipe::EPropPen, ipe::EPropRArrow, ipe::EPropRArrowShape, ipe::EPropRArrowSize, ipe::EPropStrokeColor, ipe::EPropTiling, fill(), ipe::Attribute::fillRule(), gradient(), ipe::Attribute::isEnum(), ipe::Attribute::lineCap(), ipe::Attribute::lineJoin(), opacity(), pathMode(), ipe::Attribute::pathMode(), pen(), ipe::Object::setAttribute(), setDashStyle(), setFill(), setGradient(), setOpacity(), setPathMode(), setPen(), setStroke(), setTiling(), stroke(), and tiling().

Referenced by gradient().

Attribute Path::getAttribute | ( | Property | prop | ) | const
| virtualnoexcept

Get setting of an attribute of this object.

If object does not have this attribute, returnes "undefined" attribute.

Reimplemented from ipe::Object.

References ipe::Attribute::Boolean(), dashStyle(), ipe::EPropDashStyle, ipe::EPropFArrow, ipe::EPropFArrowShape, ipe::EPropFArrowSize, ipe::EPropFillColor, ipe::EPropFillRule, ipe::EPropGradient, ipe::EPropLineCap, ipe::EPropLineJoin, ipe::EPropOpacity, ipe::EPropPathMode, ipe::EPropPen, ipe::EPropRArrow, ipe::EPropRArrowShape, ipe::EPropRArrowSize, ipe::EPropStrokeColor, ipe::EPropTiling, fill(), ipe::Object::getAttribute(), gradient(), opacity(), pen(), stroke(), and tiling().

Referenced by gradient().

bool ipe::Path::arrow | ( |  | ) | const
| inline

Does object have an arrow?

Referenced by gradient(), setArrow(), and setRarrow().

bool ipe::Path::rArrow | ( |  | ) | const
| inline

Does object have a reverse arrow?

Referenced by gradient().

Attribute ipe::Path::arrowShape | ( |  | ) | const
| inline

Return shape of arrow.

Referenced by gradient().

Attribute ipe::Path::rArrowShape | ( |  | ) | const
| inline

Return shape of reverse arrow.

Referenced by gradient().

Attribute ipe::Path::arrowSize | ( |  | ) | const
| inline

Return size of arrow.

Referenced by gradient().

Attribute ipe::Path::rArrowSize | ( |  | ) | const
| inline

Return size of reverse arrow.

Referenced by gradient().

void Path::setArrow | ( | bool | arrow,
|  | Attribute | shape,
|  | Attribute | size
| ) |  |

Set forward arrow.

References arrow(), and shape().

Referenced by gradient().

void Path::setRarrow | ( | bool | arrow,
|  | Attribute | shape,
|  | Attribute | size
| ) |  |

Set backward arrow (if the object can take it).

References arrow(), and shape().

Referenced by gradient().

void Path::drawArrow | ( | Painter & | painter,
|  | Vector | pos,
|  | Angle | angle,
|  | Attribute | shape,
|  | Attribute | size,
|  | double | radius
| ) |  |
| static

Draw an arrow of size with tip at pos directed in direction angle.

References ipe::Attribute::ARROW_FARC(), ipe::Attribute::ARROW_FPTARC(), ipe::Attribute::ARROW_PTARC(), ipe::Arc::beginp(), ipe::Painter::cascade(), ipe::Painter::closePath(), ipe::Object::draw(), ipe::Painter::drawArc(), ipe::Painter::drawPath(), ipe::EArrowSize, ipe::Arc::endp(), ipe::EStrokedAndFilled, ipe::ETransformationsRigidMotions, ipe::Cascade::find(), ipe::Cascade::findSymbol(), ipe::Symbol::iObject, ipe::Attribute::isArcArrow(), ipe::Painter::lineTo(), ipe::Painter::moveTo(), ipe::Painter::newPath(), ipe::Attribute::number(), ipe::Painter::pen(), ipe::Painter::pop(), ipe::Painter::popMatrix(), ipe::Painter::push(), ipe::Painter::pushMatrix(), ipe::Painter::setFill(), ipe::Painter::setStroke(), ipe::Painter::setSymFill(), ipe::Painter::setSymPen(), ipe::Painter::setSymStroke(), ipe::Painter::stroke(), ipe::Fixed::toDouble(), ipe::Painter::transform(), ipe::Painter::translate(), and ipe::Painter::untransform().

Referenced by draw(), and gradient().

const Shape& ipe::Path::shape | ( |  | ) | const
| inline

Return shape of the path object.

References Path(), and setShape().

Referenced by setArrow(), setRarrow(), and setShape().

void Path::setShape | ( | const Shape & | shape | ) |

References shape().

Referenced by shape().

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

- ipepath.h
- ipepath.cpp