matplotlib.backends.backend_cairo
¶Author: | Steve Chaplin and others |
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This backend depends on cairocffi or pycairo.
matplotlib.backends.backend_cairo.
ArrayWrapper
(**kwargs)[source]¶Bases: object
Deprecated since version 3.0: The ArrayWrapper class was deprecated in Matplotlib 3.0 and will be removed in 3.2.
matplotlib.backends.backend_cairo.
FigureCanvas
¶alias of matplotlib.backends.backend_cairo.FigureCanvasCairo
matplotlib.backends.backend_cairo.
FigureCanvasCairo
(figure)[source]¶Bases: matplotlib.backend_bases.FigureCanvasBase
print_raw
(fobj, *args, **kwargs)¶supports_blit
= False¶matplotlib.backends.backend_cairo.
GraphicsContextCairo
(renderer)[source]¶Bases: matplotlib.backend_bases.GraphicsContextBase
restore
()[source]¶Restore the graphics context from the stack - needed only for backends that save graphics contexts on a stack
set_alpha
(alpha)[source]¶Set the alpha value used for blending - not supported on all backends.
If alpha=None
(the default), the alpha components of the
foreground and fill colors will be used to set their respective
transparencies (where applicable); otherwise, alpha
will override
them.
set_clip_path
(path)[source]¶Set the clip path and transformation. Path should be a
TransformedPath
instance.
set_clip_rectangle
(rectangle)[source]¶Set the clip rectangle with sequence (left, bottom, width, height)
set_dashes
(offset, dashes)[source]¶Set the dash style for the gc.
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matplotlib.backends.backend_cairo.
RendererCairo
(dpi)[source]¶Bases: matplotlib.backend_bases.RendererBase
convert_path
(ctx, path, transform, clip=None)[source]¶Deprecated since version 3.0: The convert_path function was deprecated in Matplotlib 3.0 and will be removed in 3.2.
draw_image
(gc, x, y, im)[source]¶Draw an RGBA image.
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draw_markers
(gc, marker_path, marker_trans, path, transform, 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.
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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_text
(gc, x, y, s, prop, angle, ismath=False, mtext=None)[source]¶Draw the text instance
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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.
fontangles
= {'italic': <MyCairoCffi name='mock.FONT_SLANT_ITALIC' id='140354934147336'>, 'normal': <MyCairoCffi name='mock.FONT_SLANT_NORMAL' id='140354934155752'>, 'oblique': <MyCairoCffi name='mock.FONT_SLANT_OBLIQUE' id='140354934172360'>}¶fontweights
= {100: <MyCairoCffi name='mock.FONT_WEIGHT_NORMAL' id='140354934118216'>, 200: <MyCairoCffi name='mock.FONT_WEIGHT_NORMAL' id='140354934118216'>, 300: <MyCairoCffi name='mock.FONT_WEIGHT_NORMAL' id='140354934118216'>, 400: <MyCairoCffi name='mock.FONT_WEIGHT_NORMAL' id='140354934118216'>, 500: <MyCairoCffi name='mock.FONT_WEIGHT_NORMAL' id='140354934118216'>, 600: <MyCairoCffi name='mock.FONT_WEIGHT_BOLD' id='140354934134824'>, 700: <MyCairoCffi name='mock.FONT_WEIGHT_BOLD' id='140354934134824'>, 800: <MyCairoCffi name='mock.FONT_WEIGHT_BOLD' id='140354934134824'>, 900: <MyCairoCffi name='mock.FONT_WEIGHT_BOLD' id='140354934134824'>, 'ultralight': <MyCairoCffi name='mock.FONT_WEIGHT_NORMAL' id='140354934118216'>, 'light': <MyCairoCffi name='mock.FONT_WEIGHT_NORMAL' id='140354934118216'>, 'normal': <MyCairoCffi name='mock.FONT_WEIGHT_NORMAL' id='140354934118216'>, 'medium': <MyCairoCffi name='mock.FONT_WEIGHT_NORMAL' id='140354934118216'>, 'regular': <MyCairoCffi name='mock.FONT_WEIGHT_NORMAL' id='140354934118216'>, 'semibold': <MyCairoCffi name='mock.FONT_WEIGHT_BOLD' id='140354934134824'>, 'bold': <MyCairoCffi name='mock.FONT_WEIGHT_BOLD' id='140354934134824'>, 'heavy': <MyCairoCffi name='mock.FONT_WEIGHT_BOLD' id='140354934134824'>, 'ultrabold': <MyCairoCffi name='mock.FONT_WEIGHT_BOLD' id='140354934134824'>, 'black': <MyCairoCffi name='mock.FONT_WEIGHT_BOLD' id='140354934134824'>}¶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
points_to_pixels
(points)[source]¶Convert points to display units
You need to override this function (unless your backend doesn't have a dpi, e.g., postscript or svg). Some imaging systems assume some value for pixels per inch:
points to pixels = points * pixels_per_inch/72.0 * dpi/72.0
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