matplotlib.patches.FancyArrowPatch#

class matplotlib.patches.FancyArrowPatch(posA=None, posB=None, *, path=None, arrowstyle='simple', connectionstyle='arc3', patchA=None, patchB=None, shrinkA=2, shrinkB=2, mutation_scale=1, mutation_aspect=1, **kwargs)[source]#

Bases: Patch

A fancy arrow patch.

It draws an arrow using the ArrowStyle. It is primarily used by the annotate method. For most purposes, use the annotate method for drawing arrows.

The head and tail positions are fixed at the specified start and end points of the arrow, but the size and shape (in display coordinates) of the arrow does not change when the axis is moved or zoomed.

Defining the arrow position and path

There are two ways to define the arrow position and path:

• Start, end and connection: The typical approach is to define the start and end points of the arrow using posA and posB. The curve between these two can further be configured using connectionstyle.

  If given, the arrow curve is clipped by patchA and patchB, allowing it to start/end at the border of these patches. Additionally, the arrow curve can be shortened by shrinkA and shrinkB to create a margin between start/end (after possible clipping) and the drawn arrow.

• path: Alternatively if path is provided, an arrow is drawn along this Path. In this case, connectionstyle, patchA, patchB, shrinkA, and shrinkB are ignored.

Styling

The arrowstyle defines the styling of the arrow head, tail and shaft. The resulting arrows can be styled further by setting the Patch properties such as linewidth, color, facecolor, edgecolor etc. via keyword arguments.

Parameters:

posA, posB(float, float), optional

(x, y) coordinates of start and end point of the arrow. The actually drawn start and end positions may be modified through patchA, patchB, shrinkA, and shrinkB.

posA, posB are exclusive of path.

pathPath, optional

If provided, an arrow is drawn along this path and patchA, patchB, shrinkA, and shrinkB are ignored.

path is exclusive of posA, posB.

arrowstylestr or ArrowStyle, default: 'simple'

The styling of arrow head, tail and shaft. This can be

• ArrowStyle or one of its subclasses

• The shorthand string name (e.g. "->") as given in the table below, optionally containing a comma-separated list of style parameters, e.g. "->, head_length=10, head_width=5".

The style parameters are scaled by mutation_scale.

The following arrow styles are available. See also Annotation arrow style reference.

Class	Name	Parameters
Curve	-	None
CurveA	<-	head_length=0.4, head_width=0.2, widthA=1.0, widthB=1.0, lengthA=0.2, lengthB=0.2, angleA=0, angleB=0, scaleA=None, scaleB=None
CurveB	->	head_length=0.4, head_width=0.2, widthA=1.0, widthB=1.0, lengthA=0.2, lengthB=0.2, angleA=0, angleB=0, scaleA=None, scaleB=None
CurveAB	<->	head_length=0.4, head_width=0.2, widthA=1.0, widthB=1.0, lengthA=0.2, lengthB=0.2, angleA=0, angleB=0, scaleA=None, scaleB=None
CurveFilledA	<|-	head_length=0.4, head_width=0.2, widthA=1.0, widthB=1.0, lengthA=0.2, lengthB=0.2, angleA=0, angleB=0, scaleA=None, scaleB=None
CurveFilledB	-|>	head_length=0.4, head_width=0.2, widthA=1.0, widthB=1.0, lengthA=0.2, lengthB=0.2, angleA=0, angleB=0, scaleA=None, scaleB=None
CurveFilledAB	<|-|>	head_length=0.4, head_width=0.2, widthA=1.0, widthB=1.0, lengthA=0.2, lengthB=0.2, angleA=0, angleB=0, scaleA=None, scaleB=None
BracketA	]-	widthA=1.0, lengthA=0.2, angleA=0
BracketB	-[	widthB=1.0, lengthB=0.2, angleB=0
BracketAB	]-[	widthA=1.0, lengthA=0.2, angleA=0, widthB=1.0, lengthB=0.2, angleB=0
BarAB	|-|	widthA=1.0, angleA=0, widthB=1.0, angleB=0
BracketCurve	]->	widthA=1.0, lengthA=0.2, angleA=None
CurveBracket	<-[	widthB=1.0, lengthB=0.2, angleB=None
Simple	simple	head_length=0.5, head_width=0.5, tail_width=0.2
Fancy	fancy	head_length=0.4, head_width=0.4, tail_width=0.4
Wedge	wedge	tail_width=0.3, shrink_factor=0.5

Only the styles <|-, -|>, <|-|> simple, fancy and wedge contain closed paths and can be filled.

connectionstylestr or ConnectionStyle or None, optional, default: 'arc3'

ConnectionStyle with which posA and posB are connected. This can be

• ConnectionStyle or one of its subclasses

• The shorthand string name as given in the table below, e.g. "arc3".

Class	Name	Parameters
Arc3	arc3	rad=0.0
Angle3	angle3	angleA=90, angleB=0
Angle	angle	angleA=90, angleB=0, rad=0.0
Arc	arc	angleA=0, angleB=0, armA=None, armB=None, rad=0.0
Bar	bar	armA=0.0, armB=0.0, fraction=0.3, angle=None

Ignored if path is provided.

patchA, patchBPatch, default: None

Optional Patches at posA and posB, respectively. If given, the arrow path is clipped by these patches such that head and tail are at the border of the patches.

Ignored if path is provided.

shrinkA, shrinkBfloat, default: 2

Shorten the arrow path at posA and posB by this amount in points. This allows to add a margin between the intended start/end points and the arrow.

Ignored if path is provided.

mutation_scalefloat, default: 1

Value with which attributes of arrowstyle (e.g., head_length) will be scaled.

mutation_aspectNone or float, default: None

The height of the rectangle will be squeezed by this value before the mutation and the mutated box will be stretched by the inverse of it.

Other Parameters:

**kwargsPatch properties, optional

Here is a list of available Patch properties:

Property	Description
agg_filter	a filter function, which takes a (m, n, 3) float array and a dpi value, and returns a (m, n, 3) array and two offsets from the bottom left corner of the image
alpha	unknown
animated	bool
antialiased or aa	bool or None
blend_mode	blend mode
capstyle	CapStyle or {'butt', 'projecting', 'round'}
clip_box	BboxBase or None
clip_on	bool
clip_path	Patch or (Path, Transform) or None
color	color
edgecolor or ec	color or None
edgegapcolor	color or None
facecolor or fc	color or None
figure	Figure or SubFigure
fill	bool
fill_rule	{'nonzero', 'evenodd'}
gid	str
hatch	{'/', '\', '|', '-', '+', 'x', 'o', 'O', '.', '*'}
hatch_linewidth	unknown
hatchcolor	color or 'edge' or None
in_layout	bool
joinstyle	JoinStyle or {'miter', 'round', 'bevel'}
label	object
linestyle or ls	linestyle
linewidth or lw	float or None
mouseover	bool
path_effects	list of AbstractPathEffect
picker	None or bool or float or callable
rasterized	bool
sketch_params	(scale: float, length: float, randomness: float)
snap	bool or None
transform	Transform
url	str
visible	bool
zorder	float

In contrast to other patches, the default capstyle and joinstyle for FancyArrowPatch are set to "round".

draw(renderer)[source]#

Draw the Artist (and its children) using the given renderer.

This has no effect if the artist is not visible (Artist.get_visible returns False).

Parameters:

rendererRendererBase subclass.

Notes

This method is overridden in the Artist subclasses.

get_arrowstyle()[source]#

Return the arrowstyle object.

get_connectionstyle()[source]#

Return the ConnectionStyle used.

get_mutation_aspect()[source]#

Return the aspect ratio of the bbox mutation.

get_mutation_scale()[source]#

Return the mutation scale.

Returns:

scalar

get_path()[source]#

Return the path of the arrow in the data coordinates.

set(*, agg_filter=<UNSET>, alpha=<UNSET>, animated=<UNSET>, antialiased=<UNSET>, arrowstyle=<UNSET>, blend_mode=<UNSET>, capstyle=<UNSET>, clip_box=<UNSET>, clip_on=<UNSET>, clip_path=<UNSET>, color=<UNSET>, connectionstyle=<UNSET>, edgecolor=<UNSET>, edgegapcolor=<UNSET>, facecolor=<UNSET>, fill=<UNSET>, fill_rule=<UNSET>, gid=<UNSET>, hatch=<UNSET>, hatch_linewidth=<UNSET>, hatchcolor=<UNSET>, in_layout=<UNSET>, joinstyle=<UNSET>, label=<UNSET>, linestyle=<UNSET>, linewidth=<UNSET>, mouseover=<UNSET>, mutation_aspect=<UNSET>, mutation_scale=<UNSET>, patchA=<UNSET>, patchB=<UNSET>, path_effects=<UNSET>, picker=<UNSET>, positions=<UNSET>, rasterized=<UNSET>, sketch_params=<UNSET>, snap=<UNSET>, transform=<UNSET>, url=<UNSET>, visible=<UNSET>, zorder=<UNSET>)[source]#

Set multiple properties at once.

a.set(a=A, b=B, c=C)

is equivalent to

a.set_a(A)
a.set_b(B)
a.set_c(C)

In addition to the full property names, aliases are also supported, e.g. set(lw=2) is equivalent to set(linewidth=2), but it is an error to pass both simultaneously.

The order of the individual setter calls matches the order of parameters in set(). However, most properties do not depend on each other so that order is rarely relevant.

Supported properties are

Property	Description
agg_filter	a filter function, which takes a (m, n, 3) float array and a dpi value, and returns a (m, n, 3) array and two offsets from the bottom left corner of the image
alpha	float or None
animated	bool
antialiased or aa	bool or None
arrowstyle	[ '-' | '<-' | '->' | '<->' | '<|-' | '-|>' | '<|-|>' | ']-' | '-[' | ']-[' | '|-|' | ']->' | '<-[' | 'simple' | 'fancy' | 'wedge' ]
blend_mode	blend mode
capstyle	CapStyle or {'butt', 'projecting', 'round'}
clip_box	BboxBase or None
clip_on	bool
clip_path	Patch or (Path, Transform) or None
color	color
connectionstyle	[ 'arc3' | 'angle3' | 'angle' | 'arc' | 'bar' ]
edgecolor or ec	color or None
edgegapcolor	color or None
facecolor or fc	color or None
figure	Figure or SubFigure
fill	bool
fill_rule	{'nonzero', 'evenodd'}
gid	str
hatch	{'/', '\', '|', '-', '+', 'x', 'o', 'O', '.', '*'}
hatch_linewidth	unknown
hatchcolor	color or 'edge' or None
in_layout	bool
joinstyle	JoinStyle or {'miter', 'round', 'bevel'}
label	object
linestyle or ls	linestyle
linewidth or lw	float or None
mouseover	bool
mutation_aspect	float
mutation_scale	float
patchA	patches.Patch
patchB	patches.Patch
path_effects	list of AbstractPathEffect
picker	None or bool or float or callable
positions	unknown
rasterized	bool
sketch_params	(scale: float, length: float, randomness: float)
snap	bool or None
transform	Transform
url	str
visible	bool
zorder	float

set_arrowstyle(arrowstyle=None, **kwargs)[source]#

Set the arrow style, possibly with further attributes.

Attributes from the previous arrow style are not reused.

Without argument (or with arrowstyle=None), the available box styles are returned as a human-readable string.

Parameters:

arrowstylestr or ArrowStyle

The style of the arrow: either a ArrowStyle instance, or a string, which is the style name and optionally comma separated attributes (e.g. "Fancy,head_length=0.2"). Such a string is used to construct a ArrowStyle object, as documented in that class.

The following arrow styles are available:

Class	Name	Parameters
Curve	-	None
CurveA	<-	head_length=0.4, head_width=0.2, widthA=1.0, widthB=1.0, lengthA=0.2, lengthB=0.2, angleA=0, angleB=0, scaleA=None, scaleB=None
CurveB	->	head_length=0.4, head_width=0.2, widthA=1.0, widthB=1.0, lengthA=0.2, lengthB=0.2, angleA=0, angleB=0, scaleA=None, scaleB=None
CurveAB	<->	head_length=0.4, head_width=0.2, widthA=1.0, widthB=1.0, lengthA=0.2, lengthB=0.2, angleA=0, angleB=0, scaleA=None, scaleB=None
CurveFilledA	<|-	head_length=0.4, head_width=0.2, widthA=1.0, widthB=1.0, lengthA=0.2, lengthB=0.2, angleA=0, angleB=0, scaleA=None, scaleB=None
CurveFilledB	-|>	head_length=0.4, head_width=0.2, widthA=1.0, widthB=1.0, lengthA=0.2, lengthB=0.2, angleA=0, angleB=0, scaleA=None, scaleB=None
CurveFilledAB	<|-|>	head_length=0.4, head_width=0.2, widthA=1.0, widthB=1.0, lengthA=0.2, lengthB=0.2, angleA=0, angleB=0, scaleA=None, scaleB=None
BracketA	]-	widthA=1.0, lengthA=0.2, angleA=0
BracketB	-[	widthB=1.0, lengthB=0.2, angleB=0
BracketAB	]-[	widthA=1.0, lengthA=0.2, angleA=0, widthB=1.0, lengthB=0.2, angleB=0
BarAB	|-|	widthA=1.0, angleA=0, widthB=1.0, angleB=0
BracketCurve	]->	widthA=1.0, lengthA=0.2, angleA=None
CurveBracket	<-[	widthB=1.0, lengthB=0.2, angleB=None
Simple	simple	head_length=0.5, head_width=0.5, tail_width=0.2
Fancy	fancy	head_length=0.4, head_width=0.4, tail_width=0.4
Wedge	wedge	tail_width=0.3, shrink_factor=0.5

**kwargs

Additional attributes for the arrow style. See the table above for supported parameters.

Examples

set_arrowstyle("Fancy,head_length=0.2")
set_arrowstyle("fancy", head_length=0.2)

set_connectionstyle(connectionstyle=None, **kwargs)[source]#

Set the connection style, possibly with further attributes.

Attributes from the previous connection style are not reused.

Without argument (or with connectionstyle=None), the available box styles are returned as a human-readable string.

Parameters:

connectionstylestr or ConnectionStyle

The style of the connection: either a ConnectionStyle instance, or a string, which is the style name and optionally comma separated attributes (e.g. "Arc,armA=30,rad=10"). Such a string is used to construct a ConnectionStyle object, as documented in that class.

The following connection styles are available:

Class	Name	Parameters
Arc3	arc3	rad=0.0
Angle3	angle3	angleA=90, angleB=0
Angle	angle	angleA=90, angleB=0, rad=0.0
Arc	arc	angleA=0, angleB=0, armA=None, armB=None, rad=0.0
Bar	bar	armA=0.0, armB=0.0, fraction=0.3, angle=None

**kwargs

Additional attributes for the connection style. See the table above for supported parameters.

Examples

set_connectionstyle("Arc,armA=30,rad=10")
set_connectionstyle("arc", armA=30, rad=10)

set_mutation_aspect(aspect)[source]#

Set the aspect ratio of the bbox mutation.

Parameters:

aspectfloat

set_mutation_scale(scale)[source]#

Set the mutation scale.

Parameters:

scalefloat

set_patchA(patchA)[source]#

Set the tail patch.

Parameters:

patchApatches.Patch

set_patchB(patchB)[source]#

Set the head patch.

Parameters:

patchBpatches.Patch

set_positions(posA, posB)[source]#

Set the start and end positions of the connecting path.

Parameters:

posA, posBNone, tuple

(x, y) coordinates of arrow tail and arrow head respectively. If None use current value.

Examples using matplotlib.patches.FancyArrowPatch#

[]

Bar of pie

Bar of pie

[]

Angle annotations on bracket arrows

Angle annotations on bracket arrows

[]

Artists as annotations

Artists as annotations

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Arrow guide

Arrow guide

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Multiple Axes animation

Multiple Axes animation

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Annotations

Annotations