GraphArtist

GraphArtist#

class graph_tool.draw.GraphArtist(g, pos, ax, vprops=None, eprops=None, raster=False, **kwargs)[source]#

Bases: Artist

matplotlib.artist.Artist specialization that draws Graph instances in a matplotlib figure.

Warning

Vector drawing is available only on cairo-based backends. For other backends, rasterization will be used.

Parameters:

gGraph: Graph to be drawn.
posVertexPropertyMap: Vector-valued vertex property map containing the x and y coordinates of the vertices.
axmatplotlib.axes.Axes: A matplotlib.axes.Axes instance where the graph will be drawn..
vpropsdict (optional, default: None): Dictionary with the vertex properties.
epropsdict (optional, default: None): Dictionary with the edge properties.
**kwargsdict (optional, default: None): Remaining options to pass to cairo_draw.

Methods

`add_callback`(func)	Add a callback function that will be called whenever one of the .Artist's properties changes.
`contains`(mouseevent)	Test whether the artist contains the mouse event.
`convert_xunits`(x)	Convert x using the unit type of the xaxis.
`convert_yunits`(y)	Convert y using the unit type of the yaxis.
`draw`(renderer)	Draw the Artist (and its children) using the given renderer.
`draw_to_cairo`(ctx, transform[, mag])	Draw to a cairo context.
`findobj`([match, include_self])	Find artist objects.
`fit_view`([scale, margin, yflip, ...])	Set axis limits to fit the graph, optionally scaling it via the `scale` parameter, and adding a relative margin given by `margin`.
`format_cursor_data`(data)	Return a string representation of data.
`get_agg_filter`()	Return filter function to be used for agg filter.
`get_alpha`()	Return the alpha value used for blending - not supported on all backends.
`get_animated`()	Return whether the artist is animated.
`get_children`()	Return a list of the child .Artists of this .Artist.
`get_clip_box`()	Return the clipbox.
`get_clip_on`()	Return whether the artist uses clipping.
`get_clip_path`()	Return the clip path.
`get_cursor_data`(event)	Return the cursor data for a given event.
`get_figure`()	Return the .Figure instance the artist belongs to.
`get_gid`()	Return the group id.
`get_in_layout`()	Return boolean flag, `True` if artist is included in layout calculations.
`get_label`()	Return the label used for this artist in the legend.
`get_mouseover`()	Return whether this artist is queried for custom context information when the mouse cursor moves over it.
`get_path_effects`()
`get_picker`()	Return the picking behavior of the artist.
`get_rasterized`()	Return whether the artist is to be rasterized.
`get_sketch_params`()	Return the sketch parameters for the artist.
`get_snap`()	Return the snap setting.
`get_tightbbox`([renderer])	Like .Artist.get_window_extent, but includes any clipping.
`get_transform`()	Return the .Transform instance used by this artist.
`get_transformed_clip_path_and_affine`()	Return the clip path with the non-affine part of its transformation applied, and the remaining affine part of its transformation.
`get_url`()	Return the url.
`get_visible`()	Return the visibility.
`get_window_extent`([renderer])	Get the artist's bounding box in display space.
`get_zorder`()	Return the artist's zorder.
`have_units`()	Return whether units are set on any axis.
`is_transform_set`()	Return whether the Artist has an explicitly set transform.
`pchanged`()	Call all of the registered callbacks.
`pick`(mouseevent)	Process a pick event.
`pickable`()	Return whether the artist is pickable.
`properties`()	Return a dictionary of all the properties of the artist.
`remove`()	Remove the artist from the figure if possible.
`remove_callback`(oid)	Remove a callback based on its observer id.
`set`(*[, agg_filter, alpha, animated, ...])	Set multiple properties at once.
`set_agg_filter`(filter_func)	Set the agg filter.
`set_alpha`(alpha)	Set the alpha value used for blending - not supported on all backends.
`set_animated`(b)	Set whether the artist is intended to be used in an animation.
`set_clip_box`(clipbox)	Set the artist's clip .Bbox.
`set_clip_on`(b)	Set whether the artist uses clipping.
`set_clip_path`(path[, transform])	Set the artist's clip path.
`set_figure`(fig)	Set the .Figure instance the artist belongs to.
`set_gid`(gid)	Set the (group) id for the artist.
`set_in_layout`(in_layout)	Set if artist is to be included in layout calculations, E.g.
`set_label`(s)	Set a label that will be displayed in the legend.
`set_mouseover`(mouseover)	Set whether this artist is queried for custom context information when the mouse cursor moves over it.
`set_path_effects`(path_effects)	Set the path effects.
`set_picker`(picker)	Define the picking behavior of the artist.
`set_raster`([raster])	If `raster == True`, then the graph will be rasterized even if a cairo-based backend is being used.
`set_rasterized`(rasterized)	Force rasterized (bitmap) drawing for vector graphics output.
`set_sketch_params`([scale, length, randomness])	Set the sketch parameters.
`set_snap`(snap)	Set the snapping behavior.
`set_transform`(t)	Set the artist transform.
`set_url`(url)	Set the url for the artist.
`set_visible`(b)	Set the artist's visibility.
`set_zorder`(level)	Set the zorder for the artist.
`update`(props)	Update this artist's properties from the dict props.
`update_from`(other)	Copy properties from other to self.

Attributes

`axes`	The ~.axes.Axes instance the artist resides in, or None.
`mouseover`	Return whether this artist is queried for custom context information when the mouse cursor moves over it.
`stale`	Whether the artist is 'stale' and needs to be re-drawn for the output to match the internal state of the artist.
`sticky_edges`	`x` and `y` sticky edge lists for autoscaling.
`zorder`

add_callback(func)#

Add a callback function that will be called whenever one of the .Artist’s properties changes.

Parameters:

funccallable

The callback function. It must have the signature:

def func(artist: Artist) -> Any

where artist is the calling .Artist. Return values may exist but are ignored.

Returns:

int: The observer id associated with the callback. This id can be used for removing the callback with .remove_callback later.

See also

remove_callback

contains(mouseevent)#

Test whether the artist contains the mouse event.

Parameters:

mouseevent~matplotlib.backend_bases.MouseEvent

Returns:

containsbool: Whether any values are within the radius.
detailsdict: An artist-specific dictionary of details of the event context, such as which points are contained in the pick radius. See the individual Artist subclasses for details.

convert_xunits(x)#

Convert x using the unit type of the xaxis.

If the artist is not contained in an Axes or if the xaxis does not have units, x itself is returned.

convert_yunits(y)#

Convert y using the unit type of the yaxis.

If the artist is not contained in an Axes or if the yaxis does not have units, y itself is returned.

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:

renderer~matplotlib.backend_bases.RendererBase subclass.

Notes

This method is overridden in the Artist subclasses.

draw_to_cairo(ctx, transform, mag=1)[source]#: Draw to a cairo context.

findobj(match=None, include_self=True)#

Find artist objects.

Recursively find all .Artist instances contained in the artist.

Parameters:

match

A filter criterion for the matches. This can be

None: Return all objects contained in artist.
A function with signature def match(artist: Artist) -> bool. The result will only contain artists for which the function returns True.
A class instance: e.g., .Line2D. The result will only contain artists of this class or its subclasses (isinstance check).

include_selfbool

Include self in the list to be checked for a match.

Returns:

list of .Artist

fit_view(scale=1, margin=0.1, yflip=False, keep_aspect=True, set_axis_aspect=False)[source]#: Set axis limits to fit the graph, optionally scaling it via the scale parameter, and adding a relative margin given by margin. If yflip is True, the y axis is flipped upside down. If keep_aspect is True, the aspect ratio is preserved via the data limits. Otherwise, if set_axis_aspect is True, the aspect of the axis will be changed to match the data aspect.

format_cursor_data(data)#

Return a string representation of data.

Note

This method is intended to be overridden by artist subclasses. As an end-user of Matplotlib you will most likely not call this method yourself.

The default implementation converts ints and floats and arrays of ints and floats into a comma-separated string enclosed in square brackets, unless the artist has an associated colorbar, in which case scalar values are formatted using the colorbar’s formatter.

See also

get_cursor_data

get_agg_filter()#: Return filter function to be used for agg filter.

get_alpha()#: Return the alpha value used for blending - not supported on all backends.

get_animated()#: Return whether the artist is animated.

get_children()#: Return a list of the child .Artists of this .Artist.

get_clip_box()#: Return the clipbox.

get_clip_on()#: Return whether the artist uses clipping.

get_clip_path()#: Return the clip path.

get_cursor_data(event)#

Return the cursor data for a given event.

Note

This method is intended to be overridden by artist subclasses. As an end-user of Matplotlib you will most likely not call this method yourself.

Cursor data can be used by Artists to provide additional context information for a given event. The default implementation just returns None.

Subclasses can override the method and return arbitrary data. However, when doing so, they must ensure that .format_cursor_data can convert the data to a string representation.

The only current use case is displaying the z-value of an .AxesImage in the status bar of a plot window, while moving the mouse.

Parameters:

event~matplotlib.backend_bases.MouseEvent

See also

format_cursor_data

get_figure()#: Return the .Figure instance the artist belongs to.

get_gid()#: Return the group id.

get_in_layout()#

Return boolean flag, True if artist is included in layout calculations.

E.g. Constrained layout guide, .Figure.tight_layout(), and fig.savefig(fname, bbox_inches='tight').

get_label()#: Return the label used for this artist in the legend.

get_mouseover()#: Return whether this artist is queried for custom context information when the mouse cursor moves over it.

get_path_effects()#

get_picker()#

Return the picking behavior of the artist.

The possible values are described in .Artist.set_picker.

See also

Artist.set_picker, Artist.pickable, Artist.pick

get_rasterized()#: Return whether the artist is to be rasterized.

get_sketch_params()#

Return the sketch parameters for the artist.

Returns:

tuple or None

A 3-tuple with the following elements:

scale: The amplitude of the wiggle perpendicular to the source line.
length: The length of the wiggle along the line.
randomness: The scale factor by which the length is shrunken or expanded.

Returns None if no sketch parameters were set.

get_snap()#

Return the snap setting.

See .set_snap for details.

get_tightbbox(renderer=None)#

Like .Artist.get_window_extent, but includes any clipping.

Parameters:

renderer~matplotlib.backend_bases.RendererBase subclass, optional: renderer that will be used to draw the figures (i.e. fig.canvas.get_renderer())

Returns:

.Bbox or None: The enclosing bounding box (in figure pixel coordinates). Returns None if clipping results in no intersection.

get_transform()#: Return the .Transform instance used by this artist.

get_transformed_clip_path_and_affine()#: Return the clip path with the non-affine part of its transformation applied, and the remaining affine part of its transformation.

get_url()#: Return the url.

get_visible()#: Return the visibility.

get_window_extent(renderer=None)#

Get the artist’s bounding box in display space.

The bounding box’ width and height are nonnegative.

Subclasses should override for inclusion in the bounding box “tight” calculation. Default is to return an empty bounding box at 0, 0.

Be careful when using this function, the results will not update if the artist window extent of the artist changes. The extent can change due to any changes in the transform stack, such as changing the Axes limits, the figure size, or the canvas used (as is done when saving a figure). This can lead to unexpected behavior where interactive figures will look fine on the screen, but will save incorrectly.

get_zorder()#: Return the artist’s zorder.

have_units()#: Return whether units are set on any axis.

is_transform_set()#

Return whether the Artist has an explicitly set transform.

This is True after .set_transform has been called.

pchanged()#

Call all of the registered callbacks.

This function is triggered internally when a property is changed.

See also

add_callback
remove_callback

pick(mouseevent)#

Process a pick event.

Each child artist will fire a pick event if mouseevent is over the artist and the artist has picker set.

See also

Artist.set_picker, Artist.get_picker, Artist.pickable

pickable()#

Return whether the artist is pickable.

See also

Artist.set_picker, Artist.get_picker, Artist.pick

properties()#: Return a dictionary of all the properties of the artist.

remove()#

Remove the artist from the figure if possible.

The effect will not be visible until the figure is redrawn, e.g., with .FigureCanvasBase.draw_idle. Call ~.axes.Axes.relim to update the Axes limits if desired.

Note: ~.axes.Axes.relim will not see collections even if the collection was added to the Axes with autolim = True.

Note: there is no support for removing the artist’s legend entry.

remove_callback(oid)#

Remove a callback based on its observer id.

See also

add_callback

set(*, agg_filter=<UNSET>, alpha=<UNSET>, animated=<UNSET>, clip_box=<UNSET>, clip_on=<UNSET>, clip_path=<UNSET>, gid=<UNSET>, in_layout=<UNSET>, label=<UNSET>, mouseover=<UNSET>, path_effects=<UNSET>, picker=<UNSET>, raster=<UNSET>, rasterized=<UNSET>, sketch_params=<UNSET>, snap=<UNSET>, transform=<UNSET>, url=<UNSET>, visible=<UNSET>, zorder=<UNSET>)#

Set multiple properties at once.

Supported properties are

Properties:: 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 clip_box: ~matplotlib.transforms.BboxBase or None clip_on: bool clip_path: Patch or (Path, Transform) or None figure: ~matplotlib.figure.Figure gid: str in_layout: bool label: object mouseover: bool path_effects: list of .AbstractPathEffect picker: None or bool or float or callable raster: unknown rasterized: bool sketch_params: (scale: float, length: float, randomness: float) snap: bool or None transform: ~matplotlib.transforms.Transform url: str visible: bool zorder: float

set_agg_filter(filter_func)#

Set the agg filter.

Parameters:

filter_funccallable: A filter function, which takes a (m, n, depth) float array and a dpi value, and returns a (m, n, depth) array and two offsets from the bottom left corner of the image

set_alpha(alpha)#

Set the alpha value used for blending - not supported on all backends.

Parameters:

alphascalar or None: alpha must be within the 0-1 range, inclusive.

set_animated(b)#

Set whether the artist is intended to be used in an animation.

If True, the artist is excluded from regular drawing of the figure. You have to call .Figure.draw_artist / .Axes.draw_artist explicitly on the artist. This approach is used to speed up animations using blitting.

See also matplotlib.animation and Faster rendering by using blitting.

Parameters:

bbool

set_clip_box(clipbox)#

Set the artist’s clip .Bbox.

Parameters:

clipbox~matplotlib.transforms.BboxBase or None: Will typically be created from a .TransformedBbox. For instance, TransformedBbox(Bbox([[0, 0], [1, 1]]), ax.transAxes) is the default clipping for an artist added to an Axes.

set_clip_on(b)#

Set whether the artist uses clipping.

When False, artists will be visible outside the Axes which can lead to unexpected results.

Parameters:

bbool

set_clip_path(path, transform=None)#

Set the artist’s clip path.

Parameters:

path~matplotlib.patches.Patch or .Path or .TransformedPath or None: The clip path. If given a .Path, transform must be provided as well. If None, a previously set clip path is removed.
transform~matplotlib.transforms.Transform, optional: Only used if path is a .Path, in which case the given .Path is converted to a .TransformedPath using transform.

Notes

For efficiency, if path is a .Rectangle this method will set the clipping box to the corresponding rectangle and set the clipping path to None.

For technical reasons (support of ~.Artist.set), a tuple (path, transform) is also accepted as a single positional parameter.

set_figure(fig)#

Set the .Figure instance the artist belongs to.

Parameters:

fig~matplotlib.figure.Figure

set_gid(gid)#

Set the (group) id for the artist.

Parameters:

gidstr

set_in_layout(in_layout)#

Set if artist is to be included in layout calculations, E.g. Constrained layout guide, .Figure.tight_layout(), and fig.savefig(fname, bbox_inches='tight').

Parameters:

in_layoutbool

set_label(s)#

Set a label that will be displayed in the legend.

Parameters:

sobject: s will be converted to a string by calling str.

set_mouseover(mouseover)#

Set whether this artist is queried for custom context information when the mouse cursor moves over it.

Parameters:

mouseoverbool

See also

get_cursor_data
ToolCursorPosition
NavigationToolbar2

set_path_effects(path_effects)#

Set the path effects.

Parameters:

path_effectslist of .AbstractPathEffect

set_picker(picker)#

Define the picking behavior of the artist.

Parameters:

pickerNone or bool or float or callable

This can be one of the following:

None: Picking is disabled for this artist (default).
A boolean: If True then picking will be enabled and the artist will fire a pick event if the mouse event is over the artist.
A float: If picker is a number it is interpreted as an epsilon tolerance in points and the artist will fire off an event if its data is within epsilon of the mouse event. For some artists like lines and patch collections, the artist may provide additional data to the pick event that is generated, e.g., the indices of the data within epsilon of the pick event
A function: If picker is callable, it is a user supplied function which determines whether the artist is hit by the mouse event:
```
hit, props = picker(artist, mouseevent)
```
to determine the hit test. if the mouse event is over the artist, return hit=True and props is a dictionary of properties you want added to the PickEvent attributes.

set_raster(raster=True)[source]#: If raster == True, then the graph will be rasterized even if a cairo-based backend is being used.

set_rasterized(rasterized)#

Force rasterized (bitmap) drawing for vector graphics output.

Rasterized drawing is not supported by all artists. If you try to enable this on an artist that does not support it, the command has no effect and a warning will be issued.

This setting is ignored for pixel-based output.

See also /gallery/misc/rasterization_demo.

Parameters:

rasterizedbool

set_sketch_params(scale=None, length=None, randomness=None)#

Set the sketch parameters.

Parameters:

scalefloat, optional

The amplitude of the wiggle perpendicular to the source line, in pixels. If scale is None, or not provided, no sketch filter will be provided.

lengthfloat, optional

The length of the wiggle along the line, in pixels (default 128.0)

randomnessfloat, optional

The scale factor by which the length is shrunken or expanded (default 16.0)

The PGF backend uses this argument as an RNG seed and not as described above. Using the same seed yields the same random shape.

set_snap(snap)#

Set the snapping behavior.

Snapping aligns positions with the pixel grid, which results in clearer images. For example, if a black line of 1px width was defined at a position in between two pixels, the resulting image would contain the interpolated value of that line in the pixel grid, which would be a grey value on both adjacent pixel positions. In contrast, snapping will move the line to the nearest integer pixel value, so that the resulting image will really contain a 1px wide black line.

Snapping is currently only supported by the Agg and MacOSX backends.

Parameters:

snapbool or None

Possible values:

True: Snap vertices to the nearest pixel center.
False: Do not modify vertex positions.
None: (auto) If the path contains only rectilinear line segments, round to the nearest pixel center.

set_transform(t)#

Set the artist transform.

Parameters:

t~matplotlib.transforms.Transform

set_url(url)#

Set the url for the artist.

Parameters:

urlstr

set_visible(b)#

Set the artist’s visibility.

Parameters:

bbool

set_zorder(level)#

Set the zorder for the artist. Artists with lower zorder values are drawn first.

Parameters:

levelfloat

update(props)#

Update this artist’s properties from the dict props.

Parameters:

propsdict

update_from(other)#: Copy properties from other to self.

axes#: The ~.axes.Axes instance the artist resides in, or None.

mouseover#: Return whether this artist is queried for custom context information when the mouse cursor moves over it.

stale#: Whether the artist is ‘stale’ and needs to be re-drawn for the output to match the internal state of the artist.

sticky_edges#

x and y sticky edge lists for autoscaling.

When performing autoscaling, if a data limit coincides with a value in the corresponding sticky_edges list, then no margin will be added–the view limit “sticks” to the edge. A typical use case is histograms, where one usually expects no margin on the bottom edge (0) of the histogram.

Moreover, margin expansion “bumps” against sticky edges and cannot cross them. For example, if the upper data limit is 1.0, the upper view limit computed by simple margin application is 1.2, but there is a sticky edge at 1.1, then the actual upper view limit will be 1.1.

This attribute cannot be assigned to; however, the x and y lists can be modified in place as needed.

Examples

>>> artist.sticky_edges.x[:] = (xmin, xmax)
>>> artist.sticky_edges.y[:] = (ymin, ymax)

zorder = 0#

GraphArtist

Contents

GraphArtist#