# matplotlib.backends.backend_svg¶

matplotlib.backends.backend_svg.FigureCanvas
class matplotlib.backends.backend_svg.FigureCanvasSVG(figure)[source]
filetypes = {'svg': 'Scalable Vector Graphics', 'svgz': 'Scalable Vector Graphics'}
fixed_dpi = 72
get_default_filetype()[source]

Get the default savefig file format as specified in rcParam savefig.format. Returned string excludes period. Overridden in backends that only support a single file type.

print_svg(filename, *args, **kwargs)[source]
print_svgz(filename, *args, **kwargs)[source]
class matplotlib.backends.backend_svg.RendererSVG(width, height, svgwriter, basename=None, image_dpi=72)[source]
close_group(s)[source]

Close a grouping element with label s Is only currently used by backend_svg

draw_gouraud_triangle(gc, points, colors, trans)[source]

Parameters: points : array_like, shape=(3, 2) Array of (x, y) points for the triangle. colors : array_like, shape=(3, 4) RGBA colors for each point of the triangle. transform : matplotlib.transforms.Transform An affine transform to apply to the points.
draw_gouraud_triangles(gc, triangles_array, colors_array, transform)[source]

Draws a series of Gouraud triangles.

Parameters: points : array_like, shape=(N, 3, 2) Array of N (x, y) points for the triangles. colors : array_like, shape=(N, 3, 4) Array of N RGBA colors for each point of the triangles. transform : matplotlib.transforms.Transform An affine transform to apply to the points.
draw_image(gc, x, y, im, transform=None)[source]

Draw an RGBA image.

Parameters: gc : GraphicsContextBase a graphics context with clipping information. x : scalar the distance in physical units (i.e., dots or pixels) from the left hand side of the canvas. y : scalar the distance in physical units (i.e., dots or pixels) from the bottom side of the canvas. im : array_like, shape=(N, M, 4), dtype=np.uint8 An array of RGBA pixels. transform : matplotlib.transforms.Affine2DBase If and only if the concrete backend is written such that option_scale_image() returns True, an affine transformation may be passed to draw_image(). It takes the form of a Affine2DBase instance. The translation vector of the transformation is given in physical units (i.e., dots or pixels). Note that the transformation does not override x and y, and has to be applied before translating the result by x and y (this can be accomplished by adding x and y to the translation vector defined by transform).
draw_markers(gc, marker_path, marker_trans, path, trans, rgbFace=None)[source]

Draws 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: gc : GraphicsContextBase The graphics context marker_trans : matplotlib.transforms.Transform An affine transform applied to the marker. trans : matplotlib.transforms.Transform An affine transform applied to the path.
draw_path(gc, path, transform, rgbFace=None)[source]

Draws a Path instance using the given affine transform.

draw_path_collection(gc, master_transform, paths, all_transforms, offsets, offsetTrans, facecolors, edgecolors, linewidths, linestyles, antialiaseds, urls, offset_position)[source]

Draws 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.

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.

draw_tex(gc, x, y, s, prop, angle, ismath='TeX!', mtext=None)[source]
draw_text(gc, x, y, s, prop, angle, ismath=False, mtext=None)[source]

Draw the text instance

Parameters: gc : GraphicsContextBase the graphics context x : scalar the x location of the text in display coords y : scalar the y location of the text baseline in display coords s : str the text string prop : matplotlib.font_manager.FontProperties font properties angle : scalar the rotation angle in degrees mtext : matplotlib.text.Text the original text object to be rendered

Notes

backend implementers note

When you are trying to determine if you have gotten your bounding box right (which is what enables the text layout/alignment to work properly), it helps to change the line in text.py:

if 0: bbox_artist(self, renderer)


to if 1, and then the actual bounding box will be plotted along with your text.

finalize()[source]
flipy()[source]

Return true if y small numbers are top for renderer Is used for drawing text (matplotlib.text) and images (matplotlib.image) only

get_canvas_width_height()[source]

return the canvas width and height in display coords

get_image_magnification()[source]

Get the factor by which to magnify images passed to draw_image(). Allows a backend to have images at a different resolution to other artists.

get_text_width_height_descent(s, prop, ismath)[source]

Get the width, height, and descent (offset from the bottom to the baseline), in display coords, of the string s with FontProperties prop

open_group(s, gid=None)[source]

Open a grouping element with label s. If gid is given, use gid as the id of the group.

option_image_nocomposite()[source]

return whether to generate a composite image from multiple images on a set of axes

option_scale_image()[source]

override this method for renderers that support arbitrary affine transformations in draw_image() (most vector backends).

class matplotlib.backends.backend_svg.XMLWriter(file)[source]

Bases: object

close(id)[source]
comment(comment)[source]
data(text)[source]
element(tag, text=None, attrib={}, **extra)[source]
end(tag=None, indent=True)[source]
flush()[source]
start(tag, attrib={}, **extra)[source]
matplotlib.backends.backend_svg.escape_attrib(s)[source]
matplotlib.backends.backend_svg.escape_cdata(s)[source]
matplotlib.backends.backend_svg.escape_comment(s)[source]
matplotlib.backends.backend_svg.generate_css(attrib={})[source]
matplotlib.backends.backend_svg.generate_transform(transform_list=[])[source]
matplotlib.backends.backend_svg.short_float_fmt(x)[source]

Create a short string representation of a float, which is %f formatting with trailing zeros and the decimal point removed.