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388 lines
14 KiB
388 lines
14 KiB
"""
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Defines classes for path effects. The path effects are supported in
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:class:`~matplotlib.text.Text`, :class:`~matplotlib.lines.Line2D`
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and :class:`~matplotlib.patches.Patch`.
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"""
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from matplotlib.backend_bases import RendererBase
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from matplotlib import colors as mcolors
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from matplotlib import patches as mpatches
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from matplotlib import transforms as mtransforms
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class AbstractPathEffect(object):
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"""
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A base class for path effects.
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Subclasses should override the ``draw_path`` method to add effect
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functionality.
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"""
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def __init__(self, offset=(0., 0.)):
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"""
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Parameters
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----------
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offset : pair of floats
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The offset to apply to the path, measured in points.
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"""
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self._offset = offset
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self._offset_trans = mtransforms.Affine2D()
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def _offset_transform(self, renderer, transform):
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"""Apply the offset to the given transform."""
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offset_x = renderer.points_to_pixels(self._offset[0])
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offset_y = renderer.points_to_pixels(self._offset[1])
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return transform + self._offset_trans.clear().translate(offset_x,
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offset_y)
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def _update_gc(self, gc, new_gc_dict):
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"""
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Update the given GraphicsCollection with the given
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dictionary of properties. The keys in the dictionary are used to
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identify the appropriate set_ method on the gc.
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"""
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new_gc_dict = new_gc_dict.copy()
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dashes = new_gc_dict.pop("dashes", None)
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if dashes:
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gc.set_dashes(**dashes)
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for k, v in new_gc_dict.items():
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set_method = getattr(gc, 'set_' + k, None)
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if not callable(set_method):
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raise AttributeError('Unknown property {0}'.format(k))
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set_method(v)
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return gc
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def draw_path(self, renderer, gc, tpath, affine, rgbFace=None):
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"""
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Derived should override this method. The arguments are the same
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as :meth:`matplotlib.backend_bases.RendererBase.draw_path`
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except the first argument is a renderer.
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"""
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# Get the real renderer, not a PathEffectRenderer.
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if isinstance(renderer, PathEffectRenderer):
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renderer = renderer._renderer
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return renderer.draw_path(gc, tpath, affine, rgbFace)
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class PathEffectRenderer(RendererBase):
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"""
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Implements a Renderer which contains another renderer.
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This proxy then intercepts draw calls, calling the appropriate
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:class:`AbstractPathEffect` draw method.
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.. note::
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Not all methods have been overridden on this RendererBase subclass.
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It may be necessary to add further methods to extend the PathEffects
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capabilities further.
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"""
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def __init__(self, path_effects, renderer):
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"""
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Parameters
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----------
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path_effects : iterable of :class:`AbstractPathEffect`
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The path effects which this renderer represents.
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renderer : :class:`matplotlib.backend_bases.RendererBase` instance
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"""
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self._path_effects = path_effects
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self._renderer = renderer
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def new_gc(self):
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return self._renderer.new_gc()
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def copy_with_path_effect(self, path_effects):
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return self.__class__(path_effects, self._renderer)
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def draw_path(self, gc, tpath, affine, rgbFace=None):
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for path_effect in self._path_effects:
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path_effect.draw_path(self._renderer, gc, tpath, affine,
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rgbFace)
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def draw_markers(self, gc, marker_path, marker_trans, path, *args,
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**kwargs):
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# We do a little shimmy so that all markers are drawn for each path
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# effect in turn. Essentially, we induce recursion (depth 1) which is
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# terminated once we have just a single path effect to work with.
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if len(self._path_effects) == 1:
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# Call the base path effect function - this uses the unoptimised
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# approach of calling "draw_path" multiple times.
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return RendererBase.draw_markers(self, gc, marker_path,
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marker_trans, path, *args,
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**kwargs)
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for path_effect in self._path_effects:
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renderer = self.copy_with_path_effect([path_effect])
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# Recursively call this method, only next time we will only have
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# one path effect.
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renderer.draw_markers(gc, marker_path, marker_trans, path,
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*args, **kwargs)
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def draw_path_collection(self, gc, master_transform, paths, *args,
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**kwargs):
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# We do a little shimmy so that all paths are drawn for each path
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# effect in turn. Essentially, we induce recursion (depth 1) which is
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# terminated once we have just a single path effect to work with.
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if len(self._path_effects) == 1:
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# Call the base path effect function - this uses the unoptimised
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# approach of calling "draw_path" multiple times.
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return RendererBase.draw_path_collection(self, gc,
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master_transform, paths,
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*args, **kwargs)
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for path_effect in self._path_effects:
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renderer = self.copy_with_path_effect([path_effect])
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# Recursively call this method, only next time we will only have
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# one path effect.
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renderer.draw_path_collection(gc, master_transform, paths,
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*args, **kwargs)
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def points_to_pixels(self, points):
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return self._renderer.points_to_pixels(points)
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def _draw_text_as_path(self, gc, x, y, s, prop, angle, ismath):
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# Implements the naive text drawing as is found in RendererBase.
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path, transform = self._get_text_path_transform(x, y, s, prop,
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angle, ismath)
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color = gc.get_rgb()
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gc.set_linewidth(0.0)
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self.draw_path(gc, path, transform, rgbFace=color)
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def __getattribute__(self, name):
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if name in ['_text2path', 'flipy', 'height', 'width']:
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return getattr(self._renderer, name)
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else:
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return object.__getattribute__(self, name)
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class Normal(AbstractPathEffect):
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"""
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The "identity" PathEffect.
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The Normal PathEffect's sole purpose is to draw the original artist with
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no special path effect.
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"""
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pass
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class Stroke(AbstractPathEffect):
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"""A line based PathEffect which re-draws a stroke."""
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def __init__(self, offset=(0, 0), **kwargs):
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"""
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The path will be stroked with its gc updated with the given
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keyword arguments, i.e., the keyword arguments should be valid
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gc parameter values.
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"""
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super().__init__(offset)
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self._gc = kwargs
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def draw_path(self, renderer, gc, tpath, affine, rgbFace):
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"""
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draw the path with updated gc.
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"""
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# Do not modify the input! Use copy instead.
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gc0 = renderer.new_gc()
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gc0.copy_properties(gc)
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gc0 = self._update_gc(gc0, self._gc)
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trans = self._offset_transform(renderer, affine)
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renderer.draw_path(gc0, tpath, trans, rgbFace)
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gc0.restore()
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class withStroke(Stroke):
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"""
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Adds a simple :class:`Stroke` and then draws the
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original Artist to avoid needing to call :class:`Normal`.
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"""
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def draw_path(self, renderer, gc, tpath, affine, rgbFace):
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Stroke.draw_path(self, renderer, gc, tpath, affine, rgbFace)
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renderer.draw_path(gc, tpath, affine, rgbFace)
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class SimplePatchShadow(AbstractPathEffect):
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"""A simple shadow via a filled patch."""
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def __init__(self, offset=(2, -2),
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shadow_rgbFace=None, alpha=None,
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rho=0.3, **kwargs):
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"""
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Parameters
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----------
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offset : pair of floats
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The offset of the shadow in points.
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shadow_rgbFace : color
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The shadow color.
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alpha : float
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The alpha transparency of the created shadow patch.
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Default is 0.3.
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http://matplotlib.1069221.n5.nabble.com/path-effects-question-td27630.html
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rho : float
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A scale factor to apply to the rgbFace color if `shadow_rgbFace`
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is not specified. Default is 0.3.
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**kwargs
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Extra keywords are stored and passed through to
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:meth:`AbstractPathEffect._update_gc`.
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"""
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super().__init__(offset)
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if shadow_rgbFace is None:
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self._shadow_rgbFace = shadow_rgbFace
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else:
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self._shadow_rgbFace = mcolors.to_rgba(shadow_rgbFace)
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if alpha is None:
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alpha = 0.3
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self._alpha = alpha
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self._rho = rho
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#: The dictionary of keywords to update the graphics collection with.
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self._gc = kwargs
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#: The offset transform object. The offset isn't calculated yet
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#: as we don't know how big the figure will be in pixels.
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self._offset_tran = mtransforms.Affine2D()
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def draw_path(self, renderer, gc, tpath, affine, rgbFace):
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"""
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Overrides the standard draw_path to add the shadow offset and
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necessary color changes for the shadow.
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"""
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# IMPORTANT: Do not modify the input - we copy everything instead.
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affine0 = self._offset_transform(renderer, affine)
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gc0 = renderer.new_gc()
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gc0.copy_properties(gc)
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if self._shadow_rgbFace is None:
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r,g,b = (rgbFace or (1., 1., 1.))[:3]
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# Scale the colors by a factor to improve the shadow effect.
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shadow_rgbFace = (r * self._rho, g * self._rho, b * self._rho)
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else:
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shadow_rgbFace = self._shadow_rgbFace
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gc0.set_foreground("none")
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gc0.set_alpha(self._alpha)
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gc0.set_linewidth(0)
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gc0 = self._update_gc(gc0, self._gc)
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renderer.draw_path(gc0, tpath, affine0, shadow_rgbFace)
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gc0.restore()
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class withSimplePatchShadow(SimplePatchShadow):
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"""
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Adds a simple :class:`SimplePatchShadow` and then draws the
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original Artist to avoid needing to call :class:`Normal`.
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"""
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def draw_path(self, renderer, gc, tpath, affine, rgbFace):
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SimplePatchShadow.draw_path(self, renderer, gc, tpath, affine, rgbFace)
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renderer.draw_path(gc, tpath, affine, rgbFace)
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class SimpleLineShadow(AbstractPathEffect):
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"""A simple shadow via a line."""
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def __init__(self, offset=(2,-2),
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shadow_color='k', alpha=0.3, rho=0.3, **kwargs):
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"""
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Parameters
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----------
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offset : pair of floats
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The offset to apply to the path, in points.
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shadow_color : color
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The shadow color. Default is black.
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A value of ``None`` takes the original artist's color
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with a scale factor of `rho`.
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alpha : float
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The alpha transparency of the created shadow patch.
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Default is 0.3.
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rho : float
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A scale factor to apply to the rgbFace color if `shadow_rgbFace`
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is ``None``. Default is 0.3.
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**kwargs
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Extra keywords are stored and passed through to
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:meth:`AbstractPathEffect._update_gc`.
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"""
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super().__init__(offset)
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if shadow_color is None:
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self._shadow_color = shadow_color
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else:
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self._shadow_color = mcolors.to_rgba(shadow_color)
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self._alpha = alpha
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self._rho = rho
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#: The dictionary of keywords to update the graphics collection with.
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self._gc = kwargs
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#: The offset transform object. The offset isn't calculated yet
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#: as we don't know how big the figure will be in pixels.
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self._offset_tran = mtransforms.Affine2D()
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def draw_path(self, renderer, gc, tpath, affine, rgbFace):
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"""
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Overrides the standard draw_path to add the shadow offset and
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necessary color changes for the shadow.
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"""
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# IMPORTANT: Do not modify the input - we copy everything instead.
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affine0 = self._offset_transform(renderer, affine)
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gc0 = renderer.new_gc()
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gc0.copy_properties(gc)
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if self._shadow_color is None:
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r,g,b = (gc0.get_foreground() or (1., 1., 1.))[:3]
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# Scale the colors by a factor to improve the shadow effect.
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shadow_rgbFace = (r * self._rho, g * self._rho, b * self._rho)
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else:
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shadow_rgbFace = self._shadow_color
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fill_color = None
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gc0.set_foreground(shadow_rgbFace)
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gc0.set_alpha(self._alpha)
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gc0 = self._update_gc(gc0, self._gc)
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renderer.draw_path(gc0, tpath, affine0, fill_color)
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gc0.restore()
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class PathPatchEffect(AbstractPathEffect):
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"""
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Draws a :class:`~matplotlib.patches.PathPatch` instance whose Path
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comes from the original PathEffect artist.
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"""
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def __init__(self, offset=(0, 0), **kwargs):
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"""
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Parameters
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----------
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offset : pair of floats
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The offset to apply to the path, in points.
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**kwargs :
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All keyword arguments are passed through to the
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:class:`~matplotlib.patches.PathPatch` constructor. The
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properties which cannot be overridden are "path", "clip_box"
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"transform" and "clip_path".
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"""
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super().__init__(offset=offset)
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self.patch = mpatches.PathPatch([], **kwargs)
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def draw_path(self, renderer, gc, tpath, affine, rgbFace):
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affine = self._offset_transform(renderer, affine)
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self.patch._path = tpath
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self.patch.set_transform(affine)
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self.patch.set_clip_box(gc.get_clip_rectangle())
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clip_path = gc.get_clip_path()
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if clip_path:
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self.patch.set_clip_path(*clip_path)
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self.patch.draw(renderer)
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