matplotlib.axes.Axes.axline

Axes.axline(self, xy1, xy2=None, *, slope=None, **kwargs)

Add an infinitely long straight line.

The line can be defined either by two points xy1 and xy2, or by one point xy1 and a slope.

This draws a straight line "on the screen", regardless of the x and y scales, and is thus also suitable for drawing exponential decays in semilog plots, power laws in loglog plots, etc. However, slope should only be used with linear scales; It has no clear meaning for all other scales, and thus the behavior is undefined. Please specify the line using the points xy1, xy2 for non-linear scales.

Parameters:

xy1, xy2(float, float)

Points for the line to pass through. Either xy2 or slope has to be given.

slopefloat, optional

The slope of the line. Either xy2 or slope has to be given.

Returns:

Line2D

Other Parameters:

**kwargs

Valid kwargs are Line2D properties, with the exception of 'transform':

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	bool
clip_box	Bbox
clip_on	bool
clip_path	Patch or (Path, Transform) or None
color or c	color
contains	unknown
dash_capstyle	{'butt', 'round', 'projecting'}
dash_joinstyle	{'miter', 'round', 'bevel'}
dashes	sequence of floats (on/off ink in points) or (None, None)
data	(2, N) array or two 1D arrays
drawstyle or ds	{'default', 'steps', 'steps-pre', 'steps-mid', 'steps-post'}, default: 'default'
figure	Figure
fillstyle	{'full', 'left', 'right', 'bottom', 'top', 'none'}
gid	str
in_layout	bool
label	object
linestyle or ls	{'-', '--', '-.', ':', '', (offset, on-off-seq), ...}
linewidth or lw	float
marker	marker style string, Path or MarkerStyle
markeredgecolor or mec	color
markeredgewidth or mew	float
markerfacecolor or mfc	color
markerfacecoloralt or mfcalt	color
markersize or ms	float
markevery	None or int or (int, int) or slice or List[int] or float or (float, float) or List[bool]
path_effects	AbstractPathEffect
picker	unknown
pickradius	float
rasterized	bool or None
sketch_params	(scale: float, length: float, randomness: float)
snap	bool or None
solid_capstyle	{'butt', 'round', 'projecting'}
solid_joinstyle	{'miter', 'round', 'bevel'}
transform	matplotlib.transforms.Transform
url	str
visible	bool
xdata	1D array
ydata	1D array
zorder	float

See also

axhline

for horizontal lines

axvline

for vertical lines

Examples

Draw a thick red line passing through (0, 0) and (1, 1):

>>> axline((0, 0), (1, 1), linewidth=4, color='r')

Examples using matplotlib.axes.Axes.axline

axhspan Demo

Infinite lines