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65 lines
2.1 KiB
Python
65 lines
2.1 KiB
Python
"""
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Internal debugging utilities, that are not expected to be used in the rest of
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the codebase.
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WARNING: Code in this module may change without prior notice!
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"""
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from io import StringIO
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from pathlib import Path
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import subprocess
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from matplotlib.transforms import TransformNode
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def graphviz_dump_transform(transform, dest, *, highlight=None):
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"""
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Generate a graphical representation of the transform tree for *transform*
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using the :program:`dot` program (which this function depends on). The
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output format (png, dot, etc.) is determined from the suffix of *dest*.
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Parameters
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----------
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transform : `~matplotlib.transform.Transform`
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The represented transform.
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dest : str
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Output filename. The extension must be one of the formats supported
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by :program:`dot`, e.g. png, svg, dot, ...
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(see https://www.graphviz.org/doc/info/output.html).
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highlight : list of `~matplotlib.transform.Transform` or None
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The transforms in the tree to be drawn in bold.
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If *None*, *transform* is highlighted.
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"""
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if highlight is None:
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highlight = [transform]
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seen = set()
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def recurse(root, buf):
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if id(root) in seen:
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return
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seen.add(id(root))
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props = {}
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label = type(root).__name__
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if root._invalid:
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label = f'[{label}]'
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if root in highlight:
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props['style'] = 'bold'
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props['shape'] = 'box'
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props['label'] = '"%s"' % label
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props = ' '.join(map('{0[0]}={0[1]}'.format, props.items()))
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buf.write(f'{id(root)} [{props}];\n')
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for key, val in vars(root).items():
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if isinstance(val, TransformNode) and id(root) in val._parents:
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buf.write(f'"{id(root)}" -> "{id(val)}" '
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f'[label="{key}", fontsize=10];\n')
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recurse(val, buf)
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buf = StringIO()
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buf.write('digraph G {\n')
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recurse(transform, buf)
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buf.write('}\n')
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subprocess.run(
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['dot', '-T', Path(dest).suffix[1:], '-o', dest],
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input=buf.getvalue().encode('utf-8'), check=True)
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