matplotlib.patheffects

Defines classes for path effects. The path effects are supported in Text, Line2D and Patch.

See also

Path effects guide

class matplotlib.patheffects.AbstractPathEffect(offset=0.0, 0.0)[source]

Bases: object

A base class for path effects.

Subclasses should override the draw_path method to add effect functionality.

Parameters:
offsetpair of floats

The offset to apply to the path, measured in points.
draw_path(self, renderer, gc, tpath, affine, rgbFace=None)[source]

Derived should override this method. The arguments are the same as matplotlib.backend_bases.RendererBase.draw_path() except the first argument is a renderer.

class matplotlib.patheffects.Normal(offset=0.0, 0.0)[source]

Bases: matplotlib.patheffects.AbstractPathEffect

The "identity" PathEffect.

The Normal PathEffect's sole purpose is to draw the original artist with no special path effect.

Parameters:
offsetpair of floats

The offset to apply to the path, measured in points.
class matplotlib.patheffects.PathEffectRenderer(path_effects, renderer)[source]

Bases: matplotlib.backend_bases.RendererBase

Implements a Renderer which contains another renderer.

This proxy then intercepts draw calls, calling the appropriate AbstractPathEffect draw method.

Note

Not all methods have been overridden on this RendererBase subclass. It may be necessary to add further methods to extend the PathEffects capabilities further.

Parameters:
path_effectsiterable of AbstractPathEffect

The path effects which this renderer represents.

renderermatplotlib.backend_bases.RendererBase subclass
copy_with_path_effect(self, path_effects)[source]
draw_markers(self, gc, marker_path, marker_trans, path, *args, **kwargs)[source]

Draw a marker at each of the vertices in path.

This includes all vertices, including control points on curves. To avoid that behavior, those vertices should be removed before calling this function.

This provides a fallback implementation of draw_markers that makes multiple calls to draw_path(). Some backends may want to override this method in order to draw the marker only once and reuse it multiple times.

Parameters:
gcGraphicsContextBase

The graphics context.

marker_transmatplotlib.transforms.Transform

An affine transform applied to the marker.

transmatplotlib.transforms.Transform

An affine transform applied to the path.
draw_path(self, gc, tpath, affine, rgbFace=None)[source]

Draw a Path instance using the given affine transform.

draw_path_collection(self, gc, master_transform, paths, *args, **kwargs)[source]

Draw a collection of paths selecting drawing properties from the lists facecolors, edgecolors, linewidths, linestyles and antialiaseds. offsets is a list of offsets to apply to each of the paths. The offsets in offsets are first transformed by offsetTrans before being applied.

offset_position may be either "screen" or "data" depending on the space that the offsets are in; "data" is deprecated.

This provides a fallback implementation of draw_path_collection() that makes multiple calls to draw_path(). Some backends may want to override this in order to render each set of path data only once, and then reference that path multiple times with the different offsets, colors, styles etc. The generator methods _iter_collection_raw_paths() and _iter_collection() are provided to help with (and standardize) the implementation across backends. It is highly recommended to use those generators, so that changes to the behavior of draw_path_collection() can be made globally.

class matplotlib.patheffects.PathPatchEffect(offset=0, 0, **kwargs)[source]

Bases: matplotlib.patheffects.AbstractPathEffect

Draws a PathPatch instance whose Path comes from the original PathEffect artist.

Parameters:
offsetpair of floats

The offset to apply to the path, in points.

**kwargs

All keyword arguments are passed through to the PathPatch constructor. The properties which cannot be overridden are "path", "clip_box" "transform" and "clip_path".
draw_path(self, renderer, gc, tpath, affine, rgbFace)[source]

Derived should override this method. The arguments are the same as matplotlib.backend_bases.RendererBase.draw_path() except the first argument is a renderer.

class matplotlib.patheffects.SimpleLineShadow(offset=2, - 2, shadow_color='k', alpha=0.3, rho=0.3, **kwargs)[source]

Bases: matplotlib.patheffects.AbstractPathEffect

A simple shadow via a line.

Parameters:
offsetpair of floats

The offset to apply to the path, in points.

shadow_colorcolor, default: 'black'

The shadow color. A value of None takes the original artist's color with a scale factor of rho.

alphafloat, default: 0.3

The alpha transparency of the created shadow patch.

rhofloat, default: 0.3

A scale factor to apply to the rgbFace color if shadow_rgbFace is None.

**kwargs

Extra keywords are stored and passed through to AbstractPathEffect._update_gc().
draw_path(self, renderer, gc, tpath, affine, rgbFace)[source]

Overrides the standard draw_path to add the shadow offset and necessary color changes for the shadow.

class matplotlib.patheffects.SimplePatchShadow(offset=2, - 2, shadow_rgbFace=None, alpha=None, rho=0.3, **kwargs)[source]

Bases: matplotlib.patheffects.AbstractPathEffect

A simple shadow via a filled patch.

Parameters:
offsetpair of floats

The offset of the shadow in points.

shadow_rgbFacecolor

The shadow color.

alphafloat, default: 0.3

The alpha transparency of the created shadow patch. http://matplotlib.1069221.n5.nabble.com/path-effects-question-td27630.html

rhofloat, default: 0.3

A scale factor to apply to the rgbFace color if shadow_rgbFace is not specified.

**kwargs

Extra keywords are stored and passed through to AbstractPathEffect._update_gc().
draw_path(self, renderer, gc, tpath, affine, rgbFace)[source]

Overrides the standard draw_path to add the shadow offset and necessary color changes for the shadow.

class matplotlib.patheffects.Stroke(offset=0, 0, **kwargs)[source]

Bases: matplotlib.patheffects.AbstractPathEffect

A line based PathEffect which re-draws a stroke.

The path will be stroked with its gc updated with the given keyword arguments, i.e., the keyword arguments should be valid gc parameter values.

draw_path(self, renderer, gc, tpath, affine, rgbFace)[source]

Draw the path with updated gc.

class matplotlib.patheffects.withSimplePatchShadow(offset=2, - 2, shadow_rgbFace=None, alpha=None, rho=0.3, **kwargs)

Bases: matplotlib.patheffects.SimplePatchShadow

A shortcut PathEffect for applying SimplePatchShadow and then drawing the original Artist.

With this class you can use

artist.set_path_effects([path_effects.withSimplePatchShadow()])

as a shortcut for

artist.set_path_effects([path_effects.SimplePatchShadow(),
                         path_effects.Normal()])
Parameters:
offsetpair of floats

The offset of the shadow in points.

shadow_rgbFacecolor

The shadow color.

alphafloat, default: 0.3

The alpha transparency of the created shadow patch. http://matplotlib.1069221.n5.nabble.com/path-effects-question-td27630.html

rhofloat, default: 0.3

A scale factor to apply to the rgbFace color if shadow_rgbFace is not specified.

**kwargs

Extra keywords are stored and passed through to AbstractPathEffect._update_gc().
draw_path(self, renderer, gc, tpath, affine, rgbFace)

Overrides the standard draw_path to add the shadow offset and necessary color changes for the shadow.

class matplotlib.patheffects.withStroke(offset=0, 0, **kwargs)

Bases: matplotlib.patheffects.Stroke

A shortcut PathEffect for applying Stroke and then drawing the original Artist.

With this class you can use

artist.set_path_effects([path_effects.withStroke()])

as a shortcut for

artist.set_path_effects([path_effects.Stroke(),
                         path_effects.Normal()])

The path will be stroked with its gc updated with the given keyword arguments, i.e., the keyword arguments should be valid gc parameter values.

draw_path(self, renderer, gc, tpath, affine, rgbFace)

Draw the path with updated gc.