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nschloenschloe
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Merge pull request #373 from eric-wieser/fix-collections
Add support for transforms and offsets in custom collections
2 parents 1b0bb9f + 6b8484d commit fbd6f57

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‎test/test_custom_collection.py

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"""Custom collection test
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This tests plots a subclass of Collection, which contains enough information
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as a base class to be rendered.
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"""
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import matplotlib
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import matplotlib.pyplot as plt
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import numpy as np
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from helpers import assert_equality
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class TransformedEllipseCollection(matplotlib.collections.Collection):
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"""
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A gutted version of matplotlib.collections.EllipseCollection that lets us
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pass the transformation matrix directly.
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This is useful for plotting cholesky factors of covariance matrices.
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"""
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def __init__(self, matrices, **kwargs):
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super().__init__(**kwargs)
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self.set_transform(matplotlib.transforms.IdentityTransform())
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self._transforms = np.zeros(matrices.shape[:-2] + (3, 3))
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self._transforms[..., :2, :2] = matrices
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self._transforms[..., 2, 2] = 1
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self._paths = [matplotlib.path.Path.unit_circle()]
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def _set_transforms(self):
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"""Calculate transforms immediately before drawing."""
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m = self.axes.transData.get_affine().get_matrix().copy()
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m[:2, 2:] = 0
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self.set_transform(matplotlib.transforms.Affine2D(m))
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@matplotlib.artist.allow_rasterization
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def draw(self, renderer):
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self._set_transforms()
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super().draw(renderer)
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def rot(theta):
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""" Get a stack of rotation matrices """
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return np.stack(
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[
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np.stack([np.cos(theta), -np.sin(theta)], axis=-1),
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np.stack([np.sin(theta), np.cos(theta)], axis=-1),
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],
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axis=-2,
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)
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def plot():
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# plot data
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fig = plt.figure()
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ax = fig.add_subplot(111)
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theta = np.linspace(0, 2 * np.pi, 12, endpoint=False)
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mats = rot(theta) @ np.diag([0.1, 0.2])
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x = np.cos(theta)
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y = np.sin(theta)
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c = TransformedEllipseCollection(
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mats,
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offsets=np.stack((x, y), axis=-1),
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edgecolor="tab:red",
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alpha=0.5,
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facecolor="tab:blue",
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transOffset=ax.transData,
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)
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ax.add_collection(c)
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ax.set(xlim=[-1.5, 1.5], ylim=[-1.5, 1.5])
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return fig
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def test():
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assert_equality(plot, "test_custom_collection_reference.tex")
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return

‎test/test_custom_collection_reference.tex

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\begin{tikzpicture}
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\definecolor{color0}{rgb}{0.83921569,0.15294118,0.15686275}
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\definecolor{color1}{rgb}{0.12156863,0.46666667,0.70588235}
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\begin{axis}[
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tick align=outside,
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tick pos=left,
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x grid style={white!69.019608!black},
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xmin=-1.5, xmax=1.5,
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xtick style={color=black},
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y grid style={white!69.019608!black},
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ymin=-1.5, ymax=1.5,
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ytick style={color=black}
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]
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\path [draw=color0, fill=color1, opacity=0.5]
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(axis cs:1,-0.2)
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.. controls (axis cs:1.0265203,-0.2) and (axis cs:1.051958,-0.17892674) .. (axis cs:1.0707107,-0.14142136)
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--cycle;
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.. controls (axis cs:0.17892674,0.94804201) and (axis cs:0.2,0.97347969) .. (axis cs:0.2,1)
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--cycle;
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\path [draw=color0, fill=color1, opacity=0.5]
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(axis cs:-0.7660254,0.67320508)
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.. controls (axis cs:-0.7315651,0.62897611) and (axis cs:-0.74305814,0.65994493) .. (axis cs:-0.7660254,0.67320508)
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--cycle;
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\path [draw=color0, fill=color1, opacity=0.5]
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(axis cs:-1,0.2)
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.. controls (axis cs:-0.94804201,0.17892674) and (axis cs:-0.97347969,0.2) .. (axis cs:-1,0.2)
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--cycle;
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(axis cs:-0.9660254,-0.32679492)
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.. controls (axis cs:-0.91049184,-0.31906591) and (axis cs:-0.94305814,-0.31353476) .. (axis cs:-0.9660254,-0.32679492)
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--cycle;
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\path [draw=color0, fill=color1, opacity=0.5]
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(axis cs:-0.67320508,-0.7660254)
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126+
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133+
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134+
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135+
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140+
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141+
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142+
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143+
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144+
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145+
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146+
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147+
--cycle;
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\end{axis}
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\end{tikzpicture}

‎tikzplotlib/_patch.py

Lines changed: 12 additions & 6 deletions
Original file line numberDiff line numberDiff line change
@@ -63,6 +63,12 @@ def _patch_legend(obj, draw_options, legend_type):
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return legend
6464

6565

66+
def zip_modulo(*seqs):
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n = max(len(seq) for seq in seqs)
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for i in range(n):
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yield tuple(seq[i % len(seq)] for seq in seqs)
70+
71+
6672
def draw_patchcollection(data, obj):
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"""Returns PGFPlots code for a number of patch objects.
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"""
@@ -78,15 +84,15 @@ def ensure_list(x):
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fcs = ensure_list(obj.get_facecolor())
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lss = ensure_list(obj.get_linestyle())
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ws = ensure_list(obj.get_linewidth())
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ts = ensure_list(obj.get_transforms())
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offs = obj.get_offsets()
8189

8290
paths = obj.get_paths()
83-
for i, path in enumerate(paths):
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# Gather the draw options.
85-
ec = ecs[i % len(ecs)]
86-
fc = fcs[i % len(fcs)]
87-
ls = lss[i % len(lss)]
88-
w = ws[i % len(ws)]
91+
for path, ec, fc, ls, w, t, off in zip_modulo(paths, ecs, fcs, lss, ws, ts, offs):
92+
if t is None:
93+
t = mpl.transforms.IdentityTransform()
8994

95+
path = path.transformed(mpl.transforms.Affine2D(t).translate(*off))
9096
data, draw_options = mypath.get_draw_options(data, obj, ec, fc, ls, w)
9197
data, cont, draw_options, is_area = mypath.draw_path(
9298
data, path, draw_options=draw_options

‎tikzplotlib/_save.py

Lines changed: 13 additions & 13 deletions
Original file line numberDiff line numberDiff line change
@@ -316,6 +316,17 @@ def flatten(self):
316316
return content_out
317317

318318

319+
def _draw_collection(data, child):
320+
if isinstance(child, mpl.collections.PathCollection):
321+
return _path.draw_pathcollection(data, child)
322+
elif isinstance(child, mpl.collections.LineCollection):
323+
return _line2d.draw_linecollection(data, child)
324+
elif isinstance(child, mpl.collections.QuadMesh):
325+
return qmsh.draw_quadmesh(data, child)
326+
else:
327+
return _patch.draw_patchcollection(data, child)
328+
329+
319330
def _recurse(data, obj):
320331
"""Iterates over all children of the current object, gathers the contents
321332
contributing to the resulting PGFPlots file, and returns those.
@@ -365,19 +376,8 @@ def _recurse(data, obj):
365376
elif isinstance(child, mpl.patches.Patch):
366377
data, cont = _patch.draw_patch(data, child)
367378
content.extend(cont, child.get_zorder())
368-
elif isinstance(
369-
child, (mpl.collections.PatchCollection, mpl.collections.PolyCollection)
370-
):
371-
data, cont = _patch.draw_patchcollection(data, child)
372-
content.extend(cont, child.get_zorder())
373-
elif isinstance(child, mpl.collections.PathCollection):
374-
data, cont = _path.draw_pathcollection(data, child)
375-
content.extend(cont, child.get_zorder())
376-
elif isinstance(child, mpl.collections.LineCollection):
377-
data, cont = _line2d.draw_linecollection(data, child)
378-
content.extend(cont, child.get_zorder())
379-
elif isinstance(child, mpl.collections.QuadMesh):
380-
data, cont = qmsh.draw_quadmesh(data, child)
379+
elif isinstance(child, mpl.collections.Collection):
380+
data, cont = _draw_collection(data, child)
381381
content.extend(cont, child.get_zorder())
382382
elif isinstance(child, mpl.legend.Legend):
383383
data = _legend.draw_legend(data, child)

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