matplotlib.patches.FancyArrowPatch

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

Bases: matplotlib.patches.Patch

A fancy arrow patch. It draws an arrow using the ArrowStyle.

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.

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 : None, tuple, optional (default: None)

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

path : None, Path (default: None)

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

arrowstyle : str or ArrowStyle, optional (default: 'simple')

Describes how the fancy arrow will be drawn. It can be string of the available arrowstyle names, with optional comma-separated attributes, or an ArrowStyle instance. The optional attributes are meant to be scaled with the mutation_scale. The following arrow styles are available:

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

arrow_transmuter

Ignored

connectionstyle : str, ConnectionStyle, or None, optional

(default: 'arc3')

Describes how posA and posB are connected. It can be an instance of the ConnectionStyle class or a string of the connectionstyle name, with optional comma-separated attributes. The following connection styles are available:

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

connector

Ignored

patchA, patchB : None, Patch, optional (default: None)

Head and tail patch respectively. matplotlib.patch.Patch instance.

shrinkA, shrinkB : scalar, optional (default: 2)

Shrinking factor of the tail and head of the arrow respectively

mutation_scale : scalar, optional (default: 1)

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

mutation_aspect : None, scalar, optional (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.

dpi_cor : scalar, optional (default: 1)

dpi_cor is currently used for linewidth-related things and shrink factor. Mutation scale is affected by this.

Notes

Valid kwargs 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
alpha	float or None
animated	bool
antialiased or aa	unknown
capstyle	{'butt', 'round', 'projecting'}
clip_box	Bbox
clip_on	bool
clip_path	[(Path, Transform) | Patch | None]
color	color
contains	callable
edgecolor or ec	color or None or 'auto'
facecolor or fc	color or None
figure	Figure
fill	bool
gid	str
hatch	{'/', '\', '|', '-', '+', 'x', 'o', 'O', '.', '*'}
in_layout	bool
joinstyle	{'miter', 'round', 'bevel'}
label	object
linestyle or ls	{'-', '--', '-.', ':', '', (offset, on-off-seq), ...}
linewidth or lw	float or None
path_effects	AbstractPathEffect
picker	None or bool or float or callable
rasterized	bool or None
sketch_params	(scale: float, length: float, randomness: float)
snap	bool or None
transform	Transform
url	str
visible	bool
zorder	float

draw(renderer)

Draw the Patch to the given renderer.

get_arrowstyle()

Return the arrowstyle object.

get_connectionstyle()

Return the ConnectionStyle instance.

get_dpi_cor()

dpi_cor is currently used for linewidth-related things and shrink factor. Mutation scale is affected by this.

Returns:dpi_cor : scalar

get_mutation_aspect()

Return the aspect ratio of the bbox mutation.

get_mutation_scale()

Return the mutation scale.

Returns:scale : scalar

get_path()

Return the path of the arrow in the data coordinates. Use get_path_in_displaycoord() method to retrieve the arrow path in display coordinates.

get_path_in_displaycoord()

Return the mutated path of the arrow in display coordinates.

set_arrowstyle(arrowstyle=None, **kw)

Set the arrow style. Old attributes are forgotten. Without arguments (or with arrowstyle=None) returns available box styles as a list of strings.

Parameters:

arrowstyle : None, ArrowStyle, str, optional (default: None)

Can be a string with arrowstyle name with optional comma-separated attributes, e.g.:

set_arrowstyle("Fancy,head_length=0.2")

Alternatively attributes can be provided as keywords, e.g.:

set_arrowstyle("fancy", head_length=0.2)

set_connectionstyle(connectionstyle, **kw)

Set the connection style. Old attributes are forgotten.

Parameters:

connectionstyle : None, ConnectionStyle instance, or string

Can be a string with connectionstyle name with optional comma-separated attributes, e.g.:

set_connectionstyle("arc,angleA=0,armA=30,rad=10")

Alternatively, the attributes can be provided as keywords, e.g.:

set_connectionstyle("arc", angleA=0,armA=30,rad=10)

Without any arguments (or with connectionstyle=None), return available styles as a list of strings.

set_dpi_cor(dpi_cor)

dpi_cor is currently used for linewidth-related things and shrink factor. Mutation scale is affected by this.

Parameters:dpi_cor : scalar

set_mutation_aspect(aspect)

Set the aspect ratio of the bbox mutation.

Parameters:aspect : scalar

set_mutation_scale(scale)

Set the mutation scale.

Parameters:scale : scalar

set_patchA(patchA)

Set the tail patch.

Parameters:

patchA : Patch

matplotlib.patch.Patch instance.

set_patchB(patchB)

Set the head patch.

Parameters:

patchB : Patch

matplotlib.patch.Patch instance.

set_positions(posA, posB)

Set the begin and end positions of the connecting path.

Parameters:

posA, posB : None, tuple

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

Examples using matplotlib.patches.FancyArrowPatch

Arrow guide

Connectionstyle Demo