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[svgPath] add docstring to parse_path; make 'current_pos' a tuple

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This commit is contained in:
Cosimo Lupo 2017-09-08 17:52:39 +01:00
parent 1ba2c3fe9c
commit ed4cfcdf82
1 changed files with 13 additions and 1 deletions
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14
Lib/fontTools/misc/svgPath.py
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@ -24,11 +24,23 @@ def _tokenize_path(pathdef):
yield token yield token
def parse_path(pathdef, pen, current_pos=0j): def parse_path(pathdef, pen, current_pos=(0, 0)):
""" Parse SVG path definition (i.e. "d" attribute of <path> elements)
and call a 'pen' object's moveTo, lineTo, curveTo, qCurveTo and closePath
methods.
If 'current_pos' (2-float tuple) is provided, the initial moveTo will
be relative to that instead being absolute.
Arc segments (commands "A" or "a") are not currently supported, and raise
NotImplementedError.
"""
# In the SVG specs, initial movetos are absolute, even if # In the SVG specs, initial movetos are absolute, even if
# specified as 'm'. This is the default behavior here as well. # specified as 'm'. This is the default behavior here as well.
# But if you pass in a current_pos variable, the initial moveto # But if you pass in a current_pos variable, the initial moveto
# will be relative to that current_pos. This is useful. # will be relative to that current_pos. This is useful.
current_pos = complex(*current_pos)
elements = list(_tokenize_path(pathdef)) elements = list(_tokenize_path(pathdef))
# Reverse for easy use of .pop() # Reverse for easy use of .pop()
elements.reverse() elements.reverse()