540 lines
18 KiB
Python
540 lines
18 KiB
Python
|
"""
|
||
|
|
A Cairo backend for matplotlib
|
||
|
|
==============================
|
||
|
|
:Author: Steve Chaplin and others
|
||
|
|
|
||
|
|
This backend depends on cairocffi or pycairo.
|
||
|
|
"""
|
||
|
|
|
||
|
|
import gzip
|
||
|
|
import math
|
||
|
|
|
||
|
|
import numpy as np
|
||
|
|
|
||
|
|
try:
|
||
|
|
import cairo
|
||
|
|
if cairo.version_info < (1, 11, 0):
|
||
|
|
# Introduced create_for_data for Py3.
|
||
|
|
raise ImportError
|
||
|
|
except ImportError:
|
||
|
|
try:
|
||
|
|
import cairocffi as cairo
|
||
|
|
except ImportError as err:
|
||
|
|
raise ImportError(
|
||
|
|
"cairo backend requires that pycairo>=1.11.0 or cairocffi"
|
||
|
|
"is installed") from err
|
||
|
|
|
||
|
|
from .. import cbook, font_manager
|
||
|
|
from matplotlib.backend_bases import (
|
||
|
|
_Backend, _check_savefig_extra_args, FigureCanvasBase, FigureManagerBase,
|
||
|
|
GraphicsContextBase, RendererBase)
|
||
|
|
from matplotlib.font_manager import ttfFontProperty
|
||
|
|
from matplotlib.mathtext import MathTextParser
|
||
|
|
from matplotlib.path import Path
|
||
|
|
from matplotlib.transforms import Affine2D
|
||
|
|
|
||
|
|
|
||
|
|
backend_version = cairo.version
|
||
|
|
|
||
|
|
|
||
|
|
if cairo.__name__ == "cairocffi":
|
||
|
|
# Convert a pycairo context to a cairocffi one.
|
||
|
|
def _to_context(ctx):
|
||
|
|
if not isinstance(ctx, cairo.Context):
|
||
|
|
ctx = cairo.Context._from_pointer(
|
||
|
|
cairo.ffi.cast(
|
||
|
|
'cairo_t **',
|
||
|
|
id(ctx) + object.__basicsize__)[0],
|
||
|
|
incref=True)
|
||
|
|
return ctx
|
||
|
|
else:
|
||
|
|
# Pass-through a pycairo context.
|
||
|
|
def _to_context(ctx):
|
||
|
|
return ctx
|
||
|
|
|
||
|
|
|
||
|
|
def _append_path(ctx, path, transform, clip=None):
|
||
|
|
for points, code in path.iter_segments(
|
||
|
|
transform, remove_nans=True, clip=clip):
|
||
|
|
if code == Path.MOVETO:
|
||
|
|
ctx.move_to(*points)
|
||
|
|
elif code == Path.CLOSEPOLY:
|
||
|
|
ctx.close_path()
|
||
|
|
elif code == Path.LINETO:
|
||
|
|
ctx.line_to(*points)
|
||
|
|
elif code == Path.CURVE3:
|
||
|
|
cur = np.asarray(ctx.get_current_point())
|
||
|
|
a = points[:2]
|
||
|
|
b = points[-2:]
|
||
|
|
ctx.curve_to(*(cur / 3 + a * 2 / 3), *(a * 2 / 3 + b / 3), *b)
|
||
|
|
elif code == Path.CURVE4:
|
||
|
|
ctx.curve_to(*points)
|
||
|
|
|
||
|
|
|
||
|
|
def _cairo_font_args_from_font_prop(prop):
|
||
|
|
"""
|
||
|
|
Convert a `.FontProperties` or a `.FontEntry` to arguments that can be
|
||
|
|
passed to `.Context.select_font_face`.
|
||
|
|
"""
|
||
|
|
def attr(field):
|
||
|
|
try:
|
||
|
|
return getattr(prop, f"get_{field}")()
|
||
|
|
except AttributeError:
|
||
|
|
return getattr(prop, field)
|
||
|
|
|
||
|
|
name = attr("name")
|
||
|
|
slant = getattr(cairo, f"FONT_SLANT_{attr('style').upper()}")
|
||
|
|
weight = attr("weight")
|
||
|
|
weight = (cairo.FONT_WEIGHT_NORMAL
|
||
|
|
if font_manager.weight_dict.get(weight, weight) < 550
|
||
|
|
else cairo.FONT_WEIGHT_BOLD)
|
||
|
|
return name, slant, weight
|
||
|
|
|
||
|
|
|
||
|
|
class RendererCairo(RendererBase):
|
||
|
|
@cbook.deprecated("3.3")
|
||
|
|
@property
|
||
|
|
def fontweights(self):
|
||
|
|
return {
|
||
|
|
100: cairo.FONT_WEIGHT_NORMAL,
|
||
|
|
200: cairo.FONT_WEIGHT_NORMAL,
|
||
|
|
300: cairo.FONT_WEIGHT_NORMAL,
|
||
|
|
400: cairo.FONT_WEIGHT_NORMAL,
|
||
|
|
500: cairo.FONT_WEIGHT_NORMAL,
|
||
|
|
600: cairo.FONT_WEIGHT_BOLD,
|
||
|
|
700: cairo.FONT_WEIGHT_BOLD,
|
||
|
|
800: cairo.FONT_WEIGHT_BOLD,
|
||
|
|
900: cairo.FONT_WEIGHT_BOLD,
|
||
|
|
'ultralight': cairo.FONT_WEIGHT_NORMAL,
|
||
|
|
'light': cairo.FONT_WEIGHT_NORMAL,
|
||
|
|
'normal': cairo.FONT_WEIGHT_NORMAL,
|
||
|
|
'medium': cairo.FONT_WEIGHT_NORMAL,
|
||
|
|
'regular': cairo.FONT_WEIGHT_NORMAL,
|
||
|
|
'semibold': cairo.FONT_WEIGHT_BOLD,
|
||
|
|
'bold': cairo.FONT_WEIGHT_BOLD,
|
||
|
|
'heavy': cairo.FONT_WEIGHT_BOLD,
|
||
|
|
'ultrabold': cairo.FONT_WEIGHT_BOLD,
|
||
|
|
'black': cairo.FONT_WEIGHT_BOLD,
|
||
|
|
}
|
||
|
|
|
||
|
|
@cbook.deprecated("3.3")
|
||
|
|
@property
|
||
|
|
def fontangles(self):
|
||
|
|
return {
|
||
|
|
'italic': cairo.FONT_SLANT_ITALIC,
|
||
|
|
'normal': cairo.FONT_SLANT_NORMAL,
|
||
|
|
'oblique': cairo.FONT_SLANT_OBLIQUE,
|
||
|
|
}
|
||
|
|
|
||
|
|
def __init__(self, dpi):
|
||
|
|
self.dpi = dpi
|
||
|
|
self.gc = GraphicsContextCairo(renderer=self)
|
||
|
|
self.text_ctx = cairo.Context(
|
||
|
|
cairo.ImageSurface(cairo.FORMAT_ARGB32, 1, 1))
|
||
|
|
self.mathtext_parser = MathTextParser('Cairo')
|
||
|
|
RendererBase.__init__(self)
|
||
|
|
|
||
|
|
def set_ctx_from_surface(self, surface):
|
||
|
|
self.gc.ctx = cairo.Context(surface)
|
||
|
|
# Although it may appear natural to automatically call
|
||
|
|
# `self.set_width_height(surface.get_width(), surface.get_height())`
|
||
|
|
# here (instead of having the caller do so separately), this would fail
|
||
|
|
# for PDF/PS/SVG surfaces, which have no way to report their extents.
|
||
|
|
|
||
|
|
def set_width_height(self, width, height):
|
||
|
|
self.width = width
|
||
|
|
self.height = height
|
||
|
|
|
||
|
|
def _fill_and_stroke(self, ctx, fill_c, alpha, alpha_overrides):
|
||
|
|
if fill_c is not None:
|
||
|
|
ctx.save()
|
||
|
|
if len(fill_c) == 3 or alpha_overrides:
|
||
|
|
ctx.set_source_rgba(fill_c[0], fill_c[1], fill_c[2], alpha)
|
||
|
|
else:
|
||
|
|
ctx.set_source_rgba(fill_c[0], fill_c[1], fill_c[2], fill_c[3])
|
||
|
|
ctx.fill_preserve()
|
||
|
|
ctx.restore()
|
||
|
|
ctx.stroke()
|
||
|
|
|
||
|
|
def draw_path(self, gc, path, transform, rgbFace=None):
|
||
|
|
# docstring inherited
|
||
|
|
ctx = gc.ctx
|
||
|
|
# Clip the path to the actual rendering extents if it isn't filled.
|
||
|
|
clip = (ctx.clip_extents()
|
||
|
|
if rgbFace is None and gc.get_hatch() is None
|
||
|
|
else None)
|
||
|
|
transform = (transform
|
||
|
|
+ Affine2D().scale(1, -1).translate(0, self.height))
|
||
|
|
ctx.new_path()
|
||
|
|
_append_path(ctx, path, transform, clip)
|
||
|
|
self._fill_and_stroke(
|
||
|
|
ctx, rgbFace, gc.get_alpha(), gc.get_forced_alpha())
|
||
|
|
|
||
|
|
def draw_markers(self, gc, marker_path, marker_trans, path, transform,
|
||
|
|
rgbFace=None):
|
||
|
|
# docstring inherited
|
||
|
|
|
||
|
|
ctx = gc.ctx
|
||
|
|
ctx.new_path()
|
||
|
|
# Create the path for the marker; it needs to be flipped here already!
|
||
|
|
_append_path(ctx, marker_path, marker_trans + Affine2D().scale(1, -1))
|
||
|
|
marker_path = ctx.copy_path_flat()
|
||
|
|
|
||
|
|
# Figure out whether the path has a fill
|
||
|
|
x1, y1, x2, y2 = ctx.fill_extents()
|
||
|
|
if x1 == 0 and y1 == 0 and x2 == 0 and y2 == 0:
|
||
|
|
filled = False
|
||
|
|
# No fill, just unset this (so we don't try to fill it later on)
|
||
|
|
rgbFace = None
|
||
|
|
else:
|
||
|
|
filled = True
|
||
|
|
|
||
|
|
transform = (transform
|
||
|
|
+ Affine2D().scale(1, -1).translate(0, self.height))
|
||
|
|
|
||
|
|
ctx.new_path()
|
||
|
|
for i, (vertices, codes) in enumerate(
|
||
|
|
path.iter_segments(transform, simplify=False)):
|
||
|
|
if len(vertices):
|
||
|
|
x, y = vertices[-2:]
|
||
|
|
ctx.save()
|
||
|
|
|
||
|
|
# Translate and apply path
|
||
|
|
ctx.translate(x, y)
|
||
|
|
ctx.append_path(marker_path)
|
||
|
|
|
||
|
|
ctx.restore()
|
||
|
|
|
||
|
|
# Slower code path if there is a fill; we need to draw
|
||
|
|
# the fill and stroke for each marker at the same time.
|
||
|
|
# Also flush out the drawing every once in a while to
|
||
|
|
# prevent the paths from getting way too long.
|
||
|
|
if filled or i % 1000 == 0:
|
||
|
|
self._fill_and_stroke(
|
||
|
|
ctx, rgbFace, gc.get_alpha(), gc.get_forced_alpha())
|
||
|
|
|
||
|
|
# Fast path, if there is no fill, draw everything in one step
|
||
|
|
if not filled:
|
||
|
|
self._fill_and_stroke(
|
||
|
|
ctx, rgbFace, gc.get_alpha(), gc.get_forced_alpha())
|
||
|
|
|
||
|
|
def draw_image(self, gc, x, y, im):
|
||
|
|
im = cbook._unmultiplied_rgba8888_to_premultiplied_argb32(im[::-1])
|
||
|
|
surface = cairo.ImageSurface.create_for_data(
|
||
|
|
im.ravel().data, cairo.FORMAT_ARGB32,
|
||
|
|
im.shape[1], im.shape[0], im.shape[1] * 4)
|
||
|
|
ctx = gc.ctx
|
||
|
|
y = self.height - y - im.shape[0]
|
||
|
|
|
||
|
|
ctx.save()
|
||
|
|
ctx.set_source_surface(surface, float(x), float(y))
|
||
|
|
ctx.paint()
|
||
|
|
ctx.restore()
|
||
|
|
|
||
|
|
def draw_text(self, gc, x, y, s, prop, angle, ismath=False, mtext=None):
|
||
|
|
# docstring inherited
|
||
|
|
|
||
|
|
# Note: (x, y) are device/display coords, not user-coords, unlike other
|
||
|
|
# draw_* methods
|
||
|
|
if ismath:
|
||
|
|
self._draw_mathtext(gc, x, y, s, prop, angle)
|
||
|
|
|
||
|
|
else:
|
||
|
|
ctx = gc.ctx
|
||
|
|
ctx.new_path()
|
||
|
|
ctx.move_to(x, y)
|
||
|
|
|
||
|
|
ctx.select_font_face(*_cairo_font_args_from_font_prop(prop))
|
||
|
|
ctx.save()
|
||
|
|
ctx.set_font_size(prop.get_size_in_points() * self.dpi / 72)
|
||
|
|
if angle:
|
||
|
|
ctx.rotate(np.deg2rad(-angle))
|
||
|
|
ctx.show_text(s)
|
||
|
|
ctx.restore()
|
||
|
|
|
||
|
|
def _draw_mathtext(self, gc, x, y, s, prop, angle):
|
||
|
|
ctx = gc.ctx
|
||
|
|
width, height, descent, glyphs, rects = self.mathtext_parser.parse(
|
||
|
|
s, self.dpi, prop)
|
||
|
|
|
||
|
|
ctx.save()
|
||
|
|
ctx.translate(x, y)
|
||
|
|
if angle:
|
||
|
|
ctx.rotate(np.deg2rad(-angle))
|
||
|
|
|
||
|
|
for font, fontsize, s, ox, oy in glyphs:
|
||
|
|
ctx.new_path()
|
||
|
|
ctx.move_to(ox, oy)
|
||
|
|
|
||
|
|
ctx.select_font_face(
|
||
|
|
*_cairo_font_args_from_font_prop(ttfFontProperty(font)))
|
||
|
|
ctx.set_font_size(fontsize * self.dpi / 72)
|
||
|
|
ctx.show_text(s)
|
||
|
|
|
||
|
|
for ox, oy, w, h in rects:
|
||
|
|
ctx.new_path()
|
||
|
|
ctx.rectangle(ox, oy, w, h)
|
||
|
|
ctx.set_source_rgb(0, 0, 0)
|
||
|
|
ctx.fill_preserve()
|
||
|
|
|
||
|
|
ctx.restore()
|
||
|
|
|
||
|
|
def get_canvas_width_height(self):
|
||
|
|
# docstring inherited
|
||
|
|
return self.width, self.height
|
||
|
|
|
||
|
|
def get_text_width_height_descent(self, s, prop, ismath):
|
||
|
|
# docstring inherited
|
||
|
|
|
||
|
|
if ismath:
|
||
|
|
width, height, descent, fonts, used_characters = \
|
||
|
|
self.mathtext_parser.parse(s, self.dpi, prop)
|
||
|
|
return width, height, descent
|
||
|
|
|
||
|
|
ctx = self.text_ctx
|
||
|
|
# problem - scale remembers last setting and font can become
|
||
|
|
# enormous causing program to crash
|
||
|
|
# save/restore prevents the problem
|
||
|
|
ctx.save()
|
||
|
|
ctx.select_font_face(*_cairo_font_args_from_font_prop(prop))
|
||
|
|
# Cairo (says it) uses 1/96 inch user space units, ref: cairo_gstate.c
|
||
|
|
# but if /96.0 is used the font is too small
|
||
|
|
ctx.set_font_size(prop.get_size_in_points() * self.dpi / 72)
|
||
|
|
|
||
|
|
y_bearing, w, h = ctx.text_extents(s)[1:4]
|
||
|
|
ctx.restore()
|
||
|
|
|
||
|
|
return w, h, h + y_bearing
|
||
|
|
|
||
|
|
def new_gc(self):
|
||
|
|
# docstring inherited
|
||
|
|
self.gc.ctx.save()
|
||
|
|
self.gc._alpha = 1
|
||
|
|
self.gc._forced_alpha = False # if True, _alpha overrides A from RGBA
|
||
|
|
return self.gc
|
||
|
|
|
||
|
|
def points_to_pixels(self, points):
|
||
|
|
# docstring inherited
|
||
|
|
return points / 72 * self.dpi
|
||
|
|
|
||
|
|
|
||
|
|
class GraphicsContextCairo(GraphicsContextBase):
|
||
|
|
_joind = {
|
||
|
|
'bevel': cairo.LINE_JOIN_BEVEL,
|
||
|
|
'miter': cairo.LINE_JOIN_MITER,
|
||
|
|
'round': cairo.LINE_JOIN_ROUND,
|
||
|
|
}
|
||
|
|
|
||
|
|
_capd = {
|
||
|
|
'butt': cairo.LINE_CAP_BUTT,
|
||
|
|
'projecting': cairo.LINE_CAP_SQUARE,
|
||
|
|
'round': cairo.LINE_CAP_ROUND,
|
||
|
|
}
|
||
|
|
|
||
|
|
def __init__(self, renderer):
|
||
|
|
GraphicsContextBase.__init__(self)
|
||
|
|
self.renderer = renderer
|
||
|
|
|
||
|
|
def restore(self):
|
||
|
|
self.ctx.restore()
|
||
|
|
|
||
|
|
def set_alpha(self, alpha):
|
||
|
|
GraphicsContextBase.set_alpha(self, alpha)
|
||
|
|
_alpha = self.get_alpha()
|
||
|
|
rgb = self._rgb
|
||
|
|
if self.get_forced_alpha():
|
||
|
|
self.ctx.set_source_rgba(rgb[0], rgb[1], rgb[2], _alpha)
|
||
|
|
else:
|
||
|
|
self.ctx.set_source_rgba(rgb[0], rgb[1], rgb[2], rgb[3])
|
||
|
|
|
||
|
|
# def set_antialiased(self, b):
|
||
|
|
# cairo has many antialiasing modes, we need to pick one for True and
|
||
|
|
# one for False.
|
||
|
|
|
||
|
|
def set_capstyle(self, cs):
|
||
|
|
self.ctx.set_line_cap(cbook._check_getitem(self._capd, capstyle=cs))
|
||
|
|
self._capstyle = cs
|
||
|
|
|
||
|
|
def set_clip_rectangle(self, rectangle):
|
||
|
|
if not rectangle:
|
||
|
|
return
|
||
|
|
x, y, w, h = np.round(rectangle.bounds)
|
||
|
|
ctx = self.ctx
|
||
|
|
ctx.new_path()
|
||
|
|
ctx.rectangle(x, self.renderer.height - h - y, w, h)
|
||
|
|
ctx.clip()
|
||
|
|
|
||
|
|
def set_clip_path(self, path):
|
||
|
|
if not path:
|
||
|
|
return
|
||
|
|
tpath, affine = path.get_transformed_path_and_affine()
|
||
|
|
ctx = self.ctx
|
||
|
|
ctx.new_path()
|
||
|
|
affine = (affine
|
||
|
|
+ Affine2D().scale(1, -1).translate(0, self.renderer.height))
|
||
|
|
_append_path(ctx, tpath, affine)
|
||
|
|
ctx.clip()
|
||
|
|
|
||
|
|
def set_dashes(self, offset, dashes):
|
||
|
|
self._dashes = offset, dashes
|
||
|
|
if dashes is None:
|
||
|
|
self.ctx.set_dash([], 0) # switch dashes off
|
||
|
|
else:
|
||
|
|
self.ctx.set_dash(
|
||
|
|
list(self.renderer.points_to_pixels(np.asarray(dashes))),
|
||
|
|
offset)
|
||
|
|
|
||
|
|
def set_foreground(self, fg, isRGBA=None):
|
||
|
|
GraphicsContextBase.set_foreground(self, fg, isRGBA)
|
||
|
|
if len(self._rgb) == 3:
|
||
|
|
self.ctx.set_source_rgb(*self._rgb)
|
||
|
|
else:
|
||
|
|
self.ctx.set_source_rgba(*self._rgb)
|
||
|
|
|
||
|
|
def get_rgb(self):
|
||
|
|
return self.ctx.get_source().get_rgba()[:3]
|
||
|
|
|
||
|
|
def set_joinstyle(self, js):
|
||
|
|
self.ctx.set_line_join(cbook._check_getitem(self._joind, joinstyle=js))
|
||
|
|
self._joinstyle = js
|
||
|
|
|
||
|
|
def set_linewidth(self, w):
|
||
|
|
self._linewidth = float(w)
|
||
|
|
self.ctx.set_line_width(self.renderer.points_to_pixels(w))
|
||
|
|
|
||
|
|
|
||
|
|
class _CairoRegion:
|
||
|
|
def __init__(self, slices, data):
|
||
|
|
self._slices = slices
|
||
|
|
self._data = data
|
||
|
|
|
||
|
|
|
||
|
|
class FigureCanvasCairo(FigureCanvasBase):
|
||
|
|
|
||
|
|
def copy_from_bbox(self, bbox):
|
||
|
|
surface = self._renderer.gc.ctx.get_target()
|
||
|
|
if not isinstance(surface, cairo.ImageSurface):
|
||
|
|
raise RuntimeError(
|
||
|
|
"copy_from_bbox only works when rendering to an ImageSurface")
|
||
|
|
sw = surface.get_width()
|
||
|
|
sh = surface.get_height()
|
||
|
|
x0 = math.ceil(bbox.x0)
|
||
|
|
x1 = math.floor(bbox.x1)
|
||
|
|
y0 = math.ceil(sh - bbox.y1)
|
||
|
|
y1 = math.floor(sh - bbox.y0)
|
||
|
|
if not (0 <= x0 and x1 <= sw and bbox.x0 <= bbox.x1
|
||
|
|
and 0 <= y0 and y1 <= sh and bbox.y0 <= bbox.y1):
|
||
|
|
raise ValueError("Invalid bbox")
|
||
|
|
sls = slice(y0, y0 + max(y1 - y0, 0)), slice(x0, x0 + max(x1 - x0, 0))
|
||
|
|
data = (np.frombuffer(surface.get_data(), np.uint32)
|
||
|
|
.reshape((sh, sw))[sls].copy())
|
||
|
|
return _CairoRegion(sls, data)
|
||
|
|
|
||
|
|
def restore_region(self, region):
|
||
|
|
surface = self._renderer.gc.ctx.get_target()
|
||
|
|
if not isinstance(surface, cairo.ImageSurface):
|
||
|
|
raise RuntimeError(
|
||
|
|
"restore_region only works when rendering to an ImageSurface")
|
||
|
|
surface.flush()
|
||
|
|
sw = surface.get_width()
|
||
|
|
sh = surface.get_height()
|
||
|
|
sly, slx = region._slices
|
||
|
|
(np.frombuffer(surface.get_data(), np.uint32)
|
||
|
|
.reshape((sh, sw))[sly, slx]) = region._data
|
||
|
|
surface.mark_dirty_rectangle(
|
||
|
|
slx.start, sly.start, slx.stop - slx.start, sly.stop - sly.start)
|
||
|
|
|
||
|
|
@_check_savefig_extra_args
|
||
|
|
def print_png(self, fobj):
|
||
|
|
self._get_printed_image_surface().write_to_png(fobj)
|
||
|
|
|
||
|
|
@_check_savefig_extra_args
|
||
|
|
def print_rgba(self, fobj):
|
||
|
|
width, height = self.get_width_height()
|
||
|
|
buf = self._get_printed_image_surface().get_data()
|
||
|
|
fobj.write(cbook._premultiplied_argb32_to_unmultiplied_rgba8888(
|
||
|
|
np.asarray(buf).reshape((width, height, 4))))
|
||
|
|
|
||
|
|
print_raw = print_rgba
|
||
|
|
|
||
|
|
def _get_printed_image_surface(self):
|
||
|
|
width, height = self.get_width_height()
|
||
|
|
renderer = RendererCairo(self.figure.dpi)
|
||
|
|
renderer.set_width_height(width, height)
|
||
|
|
surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, width, height)
|
||
|
|
renderer.set_ctx_from_surface(surface)
|
||
|
|
self.figure.draw(renderer)
|
||
|
|
return surface
|
||
|
|
|
||
|
|
def print_pdf(self, fobj, *args, **kwargs):
|
||
|
|
return self._save(fobj, 'pdf', *args, **kwargs)
|
||
|
|
|
||
|
|
def print_ps(self, fobj, *args, **kwargs):
|
||
|
|
return self._save(fobj, 'ps', *args, **kwargs)
|
||
|
|
|
||
|
|
def print_svg(self, fobj, *args, **kwargs):
|
||
|
|
return self._save(fobj, 'svg', *args, **kwargs)
|
||
|
|
|
||
|
|
def print_svgz(self, fobj, *args, **kwargs):
|
||
|
|
return self._save(fobj, 'svgz', *args, **kwargs)
|
||
|
|
|
||
|
|
@_check_savefig_extra_args
|
||
|
|
def _save(self, fo, fmt, *, orientation='portrait'):
|
||
|
|
# save PDF/PS/SVG
|
||
|
|
|
||
|
|
dpi = 72
|
||
|
|
self.figure.dpi = dpi
|
||
|
|
w_in, h_in = self.figure.get_size_inches()
|
||
|
|
width_in_points, height_in_points = w_in * dpi, h_in * dpi
|
||
|
|
|
||
|
|
if orientation == 'landscape':
|
||
|
|
width_in_points, height_in_points = (
|
||
|
|
height_in_points, width_in_points)
|
||
|
|
|
||
|
|
if fmt == 'ps':
|
||
|
|
if not hasattr(cairo, 'PSSurface'):
|
||
|
|
raise RuntimeError('cairo has not been compiled with PS '
|
||
|
|
'support enabled')
|
||
|
|
surface = cairo.PSSurface(fo, width_in_points, height_in_points)
|
||
|
|
elif fmt == 'pdf':
|
||
|
|
if not hasattr(cairo, 'PDFSurface'):
|
||
|
|
raise RuntimeError('cairo has not been compiled with PDF '
|
||
|
|
'support enabled')
|
||
|
|
surface = cairo.PDFSurface(fo, width_in_points, height_in_points)
|
||
|
|
elif fmt in ('svg', 'svgz'):
|
||
|
|
if not hasattr(cairo, 'SVGSurface'):
|
||
|
|
raise RuntimeError('cairo has not been compiled with SVG '
|
||
|
|
'support enabled')
|
||
|
|
if fmt == 'svgz':
|
||
|
|
if isinstance(fo, str):
|
||
|
|
fo = gzip.GzipFile(fo, 'wb')
|
||
|
|
else:
|
||
|
|
fo = gzip.GzipFile(None, 'wb', fileobj=fo)
|
||
|
|
surface = cairo.SVGSurface(fo, width_in_points, height_in_points)
|
||
|
|
else:
|
||
|
|
raise ValueError("Unknown format: {!r}".format(fmt))
|
||
|
|
|
||
|
|
# surface.set_dpi() can be used
|
||
|
|
renderer = RendererCairo(self.figure.dpi)
|
||
|
|
renderer.set_width_height(width_in_points, height_in_points)
|
||
|
|
renderer.set_ctx_from_surface(surface)
|
||
|
|
ctx = renderer.gc.ctx
|
||
|
|
|
||
|
|
if orientation == 'landscape':
|
||
|
|
ctx.rotate(np.pi / 2)
|
||
|
|
ctx.translate(0, -height_in_points)
|
||
|
|
# Perhaps add an '%%Orientation: Landscape' comment?
|
||
|
|
|
||
|
|
self.figure.draw(renderer)
|
||
|
|
|
||
|
|
ctx.show_page()
|
||
|
|
surface.finish()
|
||
|
|
if fmt == 'svgz':
|
||
|
|
fo.close()
|
||
|
|
|
||
|
|
|
||
|
|
@_Backend.export
|
||
|
|
class _BackendCairo(_Backend):
|
||
|
|
FigureCanvas = FigureCanvasCairo
|
||
|
|
FigureManager = FigureManagerBase
|