/usr/lib/python3/dist-packages/matplotlib/patheffects.py is in python3-matplotlib 2.0.0+dfsg1-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 | """
Defines classes for path effects. The path effects are supported in
:class:`~matplotlib.text.Text`, :class:`~matplotlib.lines.Line2D`
and :class:`~matplotlib.patches.Patch`.
"""
from __future__ import (absolute_import, division, print_function,
unicode_literals)
import six
from matplotlib.backend_bases import RendererBase
from matplotlib import (
colors as mcolors, patches as mpatches, transforms as mtransforms)
class AbstractPathEffect(object):
"""
A base class for path effects.
Subclasses should override the ``draw_path`` method to add effect
functionality.
"""
def __init__(self, offset=(0., 0.)):
"""
Parameters
----------
offset : pair of floats
The offset to apply to the path, measured in points.
"""
self._offset = offset
self._offset_trans = mtransforms.Affine2D()
def _offset_transform(self, renderer, transform):
"""Apply the offset to the given transform."""
offset_x = renderer.points_to_pixels(self._offset[0])
offset_y = renderer.points_to_pixels(self._offset[1])
return transform + self._offset_trans.clear().translate(offset_x,
offset_y)
def _update_gc(self, gc, new_gc_dict):
"""
Update the given GraphicsCollection with the given
dictionary of properties. The keys in the dictionary are used to
identify the appropriate set_ method on the gc.
"""
new_gc_dict = new_gc_dict.copy()
dashes = new_gc_dict.pop("dashes", None)
if dashes:
gc.set_dashes(**dashes)
for k, v in six.iteritems(new_gc_dict):
set_method = getattr(gc, 'set_' + k, None)
if set_method is None or not six.callable(set_method):
raise AttributeError('Unknown property {0}'.format(k))
set_method(v)
return gc
def draw_path(self, renderer, gc, tpath, affine, rgbFace=None):
"""
Derived should override this method. The arguments are the same
as :meth:`matplotlib.backend_bases.RendererBase.draw_path`
except the first argument is a renderer.
"""
# Get the real renderer, not a PathEffectRenderer.
if isinstance(renderer, PathEffectRenderer):
renderer = renderer._renderer
return renderer.draw_path(gc, tpath, affine, rgbFace)
class PathEffectRenderer(RendererBase):
"""
Implements a Renderer which contains another renderer.
This proxy then intercepts draw calls, calling the appropriate
:class:`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.
"""
def __init__(self, path_effects, renderer):
"""
Parameters
----------
path_effects : iterable of :class:`AbstractPathEffect`
The path effects which this renderer represents.
renderer : :class:`matplotlib.backend_bases.RendererBase` instance
"""
self._path_effects = path_effects
self._renderer = renderer
def new_gc(self):
return self._renderer.new_gc()
def copy_with_path_effect(self, path_effects):
return self.__class__(path_effects, self._renderer)
def draw_path(self, gc, tpath, affine, rgbFace=None):
for path_effect in self._path_effects:
path_effect.draw_path(self._renderer, gc, tpath, affine,
rgbFace)
def draw_markers(self, gc, marker_path, marker_trans, path, *args,
**kwargs):
# We do a little shimmy so that all markers are drawn for each path
# effect in turn. Essentially, we induce recursion (depth 1) which is
# terminated once we have just a single path effect to work with.
if len(self._path_effects) == 1:
# Call the base path effect function - this uses the unoptimised
# approach of calling "draw_path" multiple times.
return RendererBase.draw_markers(self, gc, marker_path,
marker_trans, path, *args,
**kwargs)
for path_effect in self._path_effects:
renderer = self.copy_with_path_effect([path_effect])
# Recursively call this method, only next time we will only have
# one path effect.
renderer.draw_markers(gc, marker_path, marker_trans, path,
*args, **kwargs)
def draw_path_collection(self, gc, master_transform, paths, *args,
**kwargs):
# We do a little shimmy so that all paths are drawn for each path
# effect in turn. Essentially, we induce recursion (depth 1) which is
# terminated once we have just a single path effect to work with.
if len(self._path_effects) == 1:
# Call the base path effect function - this uses the unoptimised
# approach of calling "draw_path" multiple times.
return RendererBase.draw_path_collection(self, gc,
master_transform, paths,
*args, **kwargs)
for path_effect in self._path_effects:
renderer = self.copy_with_path_effect([path_effect])
# Recursively call this method, only next time we will only have
# one path effect.
renderer.draw_path_collection(gc, master_transform, paths,
*args, **kwargs)
def points_to_pixels(self, points):
return self._renderer.points_to_pixels(points)
def _draw_text_as_path(self, gc, x, y, s, prop, angle, ismath):
# Implements the naive text drawing as is found in RendererBase.
path, transform = self._get_text_path_transform(x, y, s, prop,
angle, ismath)
color = gc.get_rgb()
gc.set_linewidth(0.0)
self.draw_path(gc, path, transform, rgbFace=color)
def __getattribute__(self, name):
if name in ['_text2path', 'flipy', 'height', 'width']:
return getattr(self._renderer, name)
else:
return object.__getattribute__(self, name)
class Normal(AbstractPathEffect):
"""
The "identity" PathEffect.
The Normal PathEffect's sole purpose is to draw the original artist with
no special path effect.
"""
pass
class Stroke(AbstractPathEffect):
"""A line based PathEffect which re-draws a stroke."""
def __init__(self, offset=(0, 0), **kwargs):
"""
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.
"""
super(Stroke, self).__init__(offset)
self._gc = kwargs
def draw_path(self, renderer, gc, tpath, affine, rgbFace):
"""
draw the path with updated gc.
"""
# Do not modify the input! Use copy instead.
gc0 = renderer.new_gc()
gc0.copy_properties(gc)
gc0 = self._update_gc(gc0, self._gc)
trans = self._offset_transform(renderer, affine)
renderer.draw_path(gc0, tpath, trans, rgbFace)
gc0.restore()
class withStroke(Stroke):
"""
Adds a simple :class:`Stroke` and then draws the
original Artist to avoid needing to call :class:`Normal`.
"""
def draw_path(self, renderer, gc, tpath, affine, rgbFace):
Stroke.draw_path(self, renderer, gc, tpath, affine, rgbFace)
renderer.draw_path(gc, tpath, affine, rgbFace)
class SimplePatchShadow(AbstractPathEffect):
"""A simple shadow via a filled patch."""
def __init__(self, offset=(2, -2),
shadow_rgbFace=None, alpha=None,
rho=0.3, **kwargs):
"""
Parameters
----------
offset : pair of floats
The offset of the shadow in points.
shadow_rgbFace : color
The shadow color.
alpha : float
The alpha transparency of the created shadow patch.
Default is 0.3.
http://matplotlib.1069221.n5.nabble.com/path-effects-question-td27630.html
rho : float
A scale factor to apply to the rgbFace color if `shadow_rgbFace`
is not specified. Default is 0.3.
**kwargs
Extra keywords are stored and passed through to
:meth:`AbstractPathEffect._update_gc`.
"""
super(SimplePatchShadow, self).__init__(offset)
if shadow_rgbFace is None:
self._shadow_rgbFace = shadow_rgbFace
else:
self._shadow_rgbFace = mcolors.to_rgba(shadow_rgbFace)
if alpha is None:
alpha = 0.3
self._alpha = alpha
self._rho = rho
#: The dictionary of keywords to update the graphics collection with.
self._gc = kwargs
#: The offset transform object. The offset isn't calculated yet
#: as we don't know how big the figure will be in pixels.
self._offset_tran = mtransforms.Affine2D()
def 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.
"""
# IMPORTANT: Do not modify the input - we copy everything instead.
affine0 = self._offset_transform(renderer, affine)
gc0 = renderer.new_gc()
gc0.copy_properties(gc)
if self._shadow_rgbFace is None:
r,g,b = (rgbFace or (1., 1., 1.))[:3]
# Scale the colors by a factor to improve the shadow effect.
shadow_rgbFace = (r * self._rho, g * self._rho, b * self._rho)
else:
shadow_rgbFace = self._shadow_rgbFace
gc0.set_foreground("none")
gc0.set_alpha(self._alpha)
gc0.set_linewidth(0)
gc0 = self._update_gc(gc0, self._gc)
renderer.draw_path(gc0, tpath, affine0, shadow_rgbFace)
gc0.restore()
class withSimplePatchShadow(SimplePatchShadow):
"""
Adds a simple :class:`SimplePatchShadow` and then draws the
original Artist to avoid needing to call :class:`Normal`.
"""
def draw_path(self, renderer, gc, tpath, affine, rgbFace):
SimplePatchShadow.draw_path(self, renderer, gc, tpath, affine, rgbFace)
renderer.draw_path(gc, tpath, affine, rgbFace)
class SimpleLineShadow(AbstractPathEffect):
"""A simple shadow via a line."""
def __init__(self, offset=(2,-2),
shadow_color='k', alpha=0.3, rho=0.3, **kwargs):
"""
Parameters
----------
offset : pair of floats
The offset to apply to the path, in points.
shadow_color : color
The shadow color. Default is black.
A value of ``None`` takes the original artist's color
with a scale factor of `rho`.
alpha : float
The alpha transparency of the created shadow patch.
Default is 0.3.
rho : float
A scale factor to apply to the rgbFace color if `shadow_rgbFace`
is ``None``. Default is 0.3.
**kwargs
Extra keywords are stored and passed through to
:meth:`AbstractPathEffect._update_gc`.
"""
super(SimpleLineShadow, self).__init__(offset)
if shadow_color is None:
self._shadow_color = shadow_color
else:
self._shadow_color = mcolors.to_rgba(shadow_color)
self._alpha = alpha
self._rho = rho
#: The dictionary of keywords to update the graphics collection with.
self._gc = kwargs
#: The offset transform object. The offset isn't calculated yet
#: as we don't know how big the figure will be in pixels.
self._offset_tran = mtransforms.Affine2D()
def 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.
"""
# IMPORTANT: Do not modify the input - we copy everything instead.
affine0 = self._offset_transform(renderer, affine)
gc0 = renderer.new_gc()
gc0.copy_properties(gc)
if self._shadow_color is None:
r,g,b = (gc0.get_foreground() or (1., 1., 1.))[:3]
# Scale the colors by a factor to improve the shadow effect.
shadow_rgbFace = (r * self._rho, g * self._rho, b * self._rho)
else:
shadow_rgbFace = self._shadow_color
fill_color = None
gc0.set_foreground(shadow_rgbFace)
gc0.set_alpha(self._alpha)
gc0.set_linestyle("solid")
gc0 = self._update_gc(gc0, self._gc)
renderer.draw_path(gc0, tpath, affine0, fill_color)
gc0.restore()
class PathPatchEffect(AbstractPathEffect):
"""
Draws a :class:`~matplotlib.patches.PathPatch` instance whose Path
comes from the original PathEffect artist.
"""
def __init__(self, offset=(0, 0), **kwargs):
"""
Parameters
----------
offset : pair of floats
The offset to apply to the path, in points.
**kwargs :
All keyword arguments are passed through to the
:class:`~matplotlib.patches.PathPatch` constructor. The
properties which cannot be overridden are "path", "clip_box"
"transform" and "clip_path".
"""
super(PathPatchEffect, self).__init__(offset=offset)
self.patch = mpatches.PathPatch([], **kwargs)
def draw_path(self, renderer, gc, tpath, affine, rgbFace):
affine = self._offset_transform(renderer, affine)
self.patch._path = tpath
self.patch.set_transform(affine)
self.patch.set_clip_box(gc._cliprect)
self.patch.set_clip_path(gc._clippath)
self.patch.draw(renderer)
|