Axes.axline(xy1, xy2=None, *, slope=None, **kwargs)[source]

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.

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.

Other Parameters:

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

for horizontal lines
for vertical lines


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