Python SVG 解析器
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Python SVG parser
提问by Sareena Avadhany
I want to parse an SVG file using python to extract coordinates/paths (I believe this is listed under the "path" ID, specifically the d="..."/>). This data will eventually be used to drive a 2 axis CNC.
我想使用 python 解析一个 SVG 文件来提取坐标/路径（我相信这列在“路径”ID 下，特别是 d="..."/>)。该数据最终将用于驱动 2 轴 CNC。
I've searched on SO and Google for libraries that can return the string of such paths so I can further parse it, but to no avail. Does such a library exist?
我在 SO 和 Google 上搜索了可以返回此类路径字符串的库，以便我可以进一步解析它，但无济于事。有这样的图书馆吗？
采纳答案by icktoofay
Ignoring transforms, you can extract the path strings from an SVG like so:
忽略转换，您可以从 SVG 中提取路径字符串，如下所示：
from xml.dom import minidom
doc = minidom.parse(svg_file) # parseString also exists
path_strings = [path.getAttribute('d') for path
in doc.getElementsByTagName('path')]
doc.unlink()
回答by AndyP
Getting the d-string can be done in a line or two using svgpathtools.
可以使用svgpathtools在一两行中获取 d-string 。
from svgpathtools import svg2paths
paths, attributes = svg2paths('some_svg_file.svg')
pathsis a list of svgpathtools Path objects (containing just the curve info, no colors, styles, etc.). attributesis a list of corresponding dictionary objects storing the attributes of each path.
路径是 svgpathtools 路径对象的列表（仅包含曲线信息，不包含颜色、样式等）。 attributes是存储每个路径的属性的相应字典对象的列表。
To, say, print out the d-strings then...
比如说，打印出 d-strings 然后......
for k, v in enumerate(attributes):
print v['d'] # print d-string of k-th path in SVG
回答by Frank Buss
The question was about extracting the path strings, but in the end the line drawing commands were wanted. Based on the answer with minidom, I added the path parsing with svg.path to generate the line drawing coordinates:
问题是关于提取路径字符串，但最终需要画线命令。根据minidom的回答，我添加了svg.path的路径解析，生成画线坐标：
#!/usr/bin/python3
# requires svg.path, install it like this: pip3 install svg.path
# converts a list of path elements of a SVG file to simple line drawing commands
from svg.path import parse_path
from svg.path.path import Line
from xml.dom import minidom
# read the SVG file
doc = minidom.parse('test.svg')
path_strings = [path.getAttribute('d') for path
in doc.getElementsByTagName('path')]
doc.unlink()
# print the line draw commands
for path_string in path_strings:
path = parse_path(path_string)
for e in path:
if isinstance(e, Line):
x0 = e.start.real
y0 = e.start.imag
x1 = e.end.real
y1 = e.end.imag
print("(%.2f, %.2f) - (%.2f, %.2f)" % (x0, y0, x1, y1))
