matplotlib.patches.FancyArrowPatch

classmatplotlib.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.

There are two ways for defining an arrow:

• If posA and posB are given, a path connecting two points is created according to connectionstyle. The path will be clipped with patchA and patchB and further shrunken by shrinkA and shrinkB. An arrow is drawn along this resulting path using the arrowstyle parameter.
• Alternatively if path is provided, an arrow is drawn along this path and patchA, patchB, shrinkA, and shrinkB are ignored.

Parameters:

posA, posB(float, float), default: None

(x, y) coordinates of arrow tail and arrow head respectively.

pathPath, default: None

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

arrowstylestr or ArrowStyle, default: 'simple'

The ArrowStyle with which the fancy arrow is drawn. If a string, it should be one of the available arrowstyle names, with optional comma-separated attributes. The optional attributes are meant to be scaled with the mutation_scale. The following arrow styles are available:

Class	Name	Attrs
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

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

The ConnectionStyle with which posA and posB are connected. If a string, it should be one of the available connectionstyle names, with optional comma-separated attributes. The following connection styles are available:

Class	Name	Attrs
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

patchA, patchBPatch, default: None

Head and tail patches, respectively.

shrinkA, shrinkBfloat, default: 2

Shrink amount, in points, of the tail and head of the arrow respectively.

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
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
facecolor or fc	color or None
figure	Figure
fill	bool
gid	str
hatch	{'/', '\', '|', '-', '+', 'x', 'o', 'O', '.', '*'}
in_layout	bool
joinstyle	JoinStyle or {'miter', 'round', 'bevel'}
label	object
linestyle or ls	{'-', '--', '-.', ':', '', (offset, on-off-seq), ...}
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>, capstyle=<UNSET>, clip_box=<UNSET>, clip_on=<UNSET>, clip_path=<UNSET>, color=<UNSET>, connectionstyle=<UNSET>, edgecolor=<UNSET>, facecolor=<UNSET>, fill=<UNSET>, gid=<UNSET>, hatch=<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.

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	scalar or None
animated	bool
antialiased or aa	bool or None
arrowstyle	str or ArrowStyle
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
facecolor or fc	color or None
figure	Figure
fill	bool
gid	str
hatch	{'/', '\', '|', '-', '+', 'x', 'o', 'O', '.', '*'}
in_layout	bool
joinstyle	JoinStyle or {'miter', 'round', 'bevel'}
label	object
linestyle or ls	{'-', '--', '-.', ':', '', (offset, on-off-seq), ...}
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:

%(ArrowStyle:table_and_accepts)s

**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	Attrs
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

Arrow guide

Arrow guide

Multiple Axes animation

Multiple Axes animation

Connection styles for annotations

Connection styles for annotations

Annotations

Annotations