# matplotlib.patches.ArrowStyle¶

class matplotlib.patches.ArrowStyle[source]

Bases: matplotlib.patches._Style

ArrowStyle is a container class which defines several arrowstyle classes, which is used to create an arrow path along a given path. These are mainly used with FancyArrowPatch.

A arrowstyle object can be either created as:

ArrowStyle.Fancy(head_length=.4, head_width=.4, tail_width=.4)


or:

ArrowStyle("Fancy", head_length=.4, head_width=.4, tail_width=.4)


or:

ArrowStyle("Fancy, head_length=.4, head_width=.4, tail_width=.4")


The following classes are defined

Class Name Attrs
Curve - None
CurveB -> head_length=0.4, head_width=0.2
BracketB -[ widthB=1.0, lengthB=0.2, angleB=None
CurveFilledB -|> head_length=0.4, head_width=0.2
CurveA <- head_length=0.4, head_width=0.2
CurveAB <-> head_length=0.4, head_width=0.2
CurveFilledA <|- head_length=0.4, head_width=0.2
CurveFilledAB <|-|> head_length=0.4, head_width=0.2
BracketA ]- widthA=1.0, lengthA=0.2, angleA=None
BracketAB ]-[ widthA=1.0, lengthA=0.2, angleA=None, widthB=1.0, lengthB=0.2, angleB=None
Fancy fancy head_length=0.4, head_width=0.4, tail_width=0.4
Simple simple head_length=0.5, head_width=0.5, tail_width=0.2
Wedge wedge tail_width=0.3, shrink_factor=0.5
BarAB |-| widthA=1.0, angleA=None, widthB=1.0, angleB=None

An instance of any arrow style class is a callable object, whose call signature is:

__call__(self, path, mutation_size, linewidth, aspect_ratio=1.)


and it returns a tuple of a Path instance and a boolean value. path is a Path instance along which the arrow will be drawn. mutation_size and aspect_ratio have the same meaning as in BoxStyle. linewidth is a line width to be stroked. This is meant to be used to correct the location of the head so that it does not overshoot the destination point, but not all classes support it.

return the instance of the subclass with the given style name.

class BarAB(widthA=1.0, angleA=None, widthB=1.0, angleB=None)[source]

Bases: matplotlib.patches._Bracket

An arrow with a bar(|) at both ends.

Parameters: widthA : float, optional, default Width of the bracket angleA : float, optional, default Angle between the bracket and the line widthB : float, optional, default Width of the bracket angleB : float, optional, default Angle between the bracket and the line
class BracketA(widthA=1.0, lengthA=0.2, angleA=None)[source]

Bases: matplotlib.patches._Bracket

An arrow with a bracket(]) at its end.

Parameters: widthA : float, optional, default Width of the bracket lengthA : float, optional, default Length of the bracket angleA : float, optional, default Angle between the bracket and the line
class BracketAB(widthA=1.0, lengthA=0.2, angleA=None, widthB=1.0, lengthB=0.2, angleB=None)[source]

Bases: matplotlib.patches._Bracket

An arrow with a bracket(]) at both ends.

Parameters: widthA : float, optional, default Width of the bracket lengthA : float, optional, default Length of the bracket angleA : float, optional, default Angle between the bracket and the line widthB : float, optional, default Width of the bracket lengthB : float, optional, default Length of the bracket angleB : float, optional, default Angle between the bracket and the line
class BracketB(widthB=1.0, lengthB=0.2, angleB=None)[source]

Bases: matplotlib.patches._Bracket

An arrow with a bracket([) at its end.

Parameters: widthB : float, optional, default Width of the bracket lengthB : float, optional, default Length of the bracket angleB : float, optional, default Angle between the bracket and the line
class Curve[source]

Bases: matplotlib.patches._Curve

A simple curve without any arrow head.

class CurveA(head_length=0.4, head_width=0.2)[source]

Bases: matplotlib.patches._Curve

An arrow with a head at its begin point.

class CurveAB(head_length=0.4, head_width=0.2)[source]

Bases: matplotlib.patches._Curve

An arrow with heads both at the begin and the end point.

class CurveB(head_length=0.4, head_width=0.2)[source]

Bases: matplotlib.patches._Curve

An arrow with a head at its end point.

class CurveFilledA(head_length=0.4, head_width=0.2)[source]

Bases: matplotlib.patches._Curve

An arrow with filled triangle head at the begin.

class CurveFilledAB(head_length=0.4, head_width=0.2)[source]

Bases: matplotlib.patches._Curve

An arrow with filled triangle heads at both ends.

class CurveFilledB(head_length=0.4, head_width=0.2)[source]

Bases: matplotlib.patches._Curve

An arrow with filled triangle head at the end.

class Fancy(head_length=0.4, head_width=0.4, tail_width=0.4)[source]

Bases: matplotlib.patches._Base

A fancy arrow. Only works with a quadratic Bezier curve.

Parameters: head_length : float, optional, default Length of the arrow head head_width : float, optional, default Width of the arrow head tail_width : float, optional, default Width of the arrow tail
transmute(self, path, mutation_size, linewidth)[source]

The transmute method is the very core of the ArrowStyle class and must be overridden in the subclasses. It receives the path object along which the arrow will be drawn, and the mutation_size, with which the arrow head etc. will be scaled. The linewidth may be used to adjust the path so that it does not pass beyond the given points. It returns a tuple of a Path instance and a boolean. The boolean value indicate whether the path can be filled or not. The return value can also be a list of paths and list of booleans of a same length.

class Simple(head_length=0.5, head_width=0.5, tail_width=0.2)[source]

Bases: matplotlib.patches._Base

A simple arrow. Only works with a quadratic Bezier curve.

Parameters: head_length : float, optional, default Length of the arrow head head_width : float, optional, default Width of the arrow head tail_width : float, optional, default Width of the arrow tail
transmute(self, path, mutation_size, linewidth)[source]

The transmute method is the very core of the ArrowStyle class and must be overridden in the subclasses. It receives the path object along which the arrow will be drawn, and the mutation_size, with which the arrow head etc. will be scaled. The linewidth may be used to adjust the path so that it does not pass beyond the given points. It returns a tuple of a Path instance and a boolean. The boolean value indicate whether the path can be filled or not. The return value can also be a list of paths and list of booleans of a same length.

class Wedge(tail_width=0.3, shrink_factor=0.5)[source]

Bases: matplotlib.patches._Base

Wedge(?) shape. Only works with a quadratic Bezier curve. The begin point has a width of the tail_width and the end point has a width of 0. At the middle, the width is shrink_factor*tail_width.

Parameters: tail_width : float, optional, default Width of the tail shrink_factor : float, optional, default Fraction of the arrow width at the middle point
transmute(self, path, mutation_size, linewidth)[source]

The transmute method is the very core of the ArrowStyle class and must be overridden in the subclasses. It receives the path object along which the arrow will be drawn, and the mutation_size, with which the arrow head etc. will be scaled. The linewidth may be used to adjust the path so that it does not pass beyond the given points. It returns a tuple of a Path instance and a boolean. The boolean value indicate whether the path can be filled or not. The return value can also be a list of paths and list of booleans of a same length.