python - 更改 KML 中的标签 ID 属性 (Simplekml)

Question

是否可以在 simplekml 中更改标签中的 id 属性？

import simplekml
kml = simplekml.Kml()
pnt = kml.newpoint(name='A Point')
pnt.coords = [(1.0, 2.0)]
kml.save("icon.kml")

这将生成以下文档

<?xml version="1.0" encoding="UTF-8"?>
<kml xmlns="http://www.opengis.net/kml/2.2" xmlns:gx="http://www.google.com/kml/ext/2.2">
    <Document id="1">
        <Folder id="2">
            <Style id="5">
                <IconStyle id="6">
                    <colorMode>normal</colorMode>
                    <scale>1</scale>
                    <heading>0</heading>
                    <Icon id="7">
                        <href>https://www.gstatic.com/mapspro/images/stock/503-wht-blank_maps.png</href>
                    </Icon>
                </IconStyle>
            </Style>
            <Placemark id="4">
                <name>A Point</name>
                <styleUrl>#5</styleUrl>
                <Point id="3">
                    <coordinates>1.0,2.0,0.0</coordinates>
                </Point>
            </Placemark>
        </Folder>
    </Document>
</kml>

请注意，在某些标签中，id 属性看起来好像是从某个 simplekml 索引生成的。我需要更改分配给 <Style id="5"> 的 ID标记为 <Style id="icon-1532-0288D1-nodesc-normal">

这会更改 Google 我的 map 上的图标。我如何使用 simplekml 执行此操作？

Answer 1

它看起来像在(入门)文档中，https://simplekml.readthedocs.io/en/latest/gettingstarted.html ，对于不同类型的对象，id 标签的生成方式不同，即 'feat_1'、'feat_2'、'geom_0':

import simplekml
kml = simplekml.Kml()
pnt = kml.newpoint(name="A Point")
print kml.kml()

这是生成的内容:

<?xml version="1.0" encoding="UTF-8"?>
<kml xmlns="http://www.opengis.net/kml/2.2" xmlns:gx="http://www.google.com/kml/ext/2.2">
    <Document id="feat_1">
        <Placemark id="feat_2">
            <name>A Point</name>
            <Point id="geom_0">
                <coordinates>0.0, 0.0, 0.0</coordinates>
            </Point>
        </Placemark>
    </Document>
</kml>

我查看了源代码，看起来至少在 1.3.2 版本中，他们摆脱了这一点，并通过向上计数来生成标签 ID。

class Kmlable(object):
    """Enables a subclass to be converted into KML."""
    _globalid = 0
    _currentroot = None
    _compiling = False
    _namespaces = ['xmlns="http://www.opengis.net/kml/2.2"', 'xmlns:gx="http://www.google.com/kml/ext/2.2"']
    
    def __init__(self):
        self._id = str(Kmlable._globalid)
        Kmlable._globalid += 1
        try:
            from collections import OrderedDict
            self._kml = OrderedDict()
        except ImportError:
            self._kml = {}

出于某种原因，这些 id 标签被设计为只读:

    @property
    def id(self):
        """The id string (read only)."""
        return self._id

您可以通过一种 hack-y 方式来更改它(在 base.py 中):

class Kmlable(object):
    """Enables a subclass to be converted into KML."""
    #_globalid = 0
    _globalid = 'your_string_here'
    _currentroot = None
    _compiling = False
    _namespaces = ['xmlns="http://www.opengis.net/kml/2.2"', 'xmlns:gx="http://www.google.com/kml/ext/2.2"']
    
    def __init__(self):
        self._id = str(Kmlable._globalid)
        #Kmlable._globalid += 1
        try:
            from collections import OrderedDict
            self._kml = OrderedDict()
        except ImportError:
            self._kml = {}

但是这将为您在 kml 文档中的每个对象设置相同的 id:

import simplekml
kml = simplekml.Kml()
pnt = kml.newpoint(name="A Point")
print(kml.kml())

<?xml version="1.0" encoding="UTF-8"?>
<kml xmlns="http://www.opengis.net/kml/2.2" xmlns:gx="http://www.google.com/kml/ext/2.2">
    <Document id="your_string_here">
        <Placemark id="your_string_here">
            <name>A Point</name>
            <Point id="your_string_here">
                <coordinates>0.0, 0.0, 0.0</coordinates>
            </Point>
        </Placemark>
    </Document>
</kml>

希望这有助于您的理解。不是一个完整的答案，但太长了，无法在评论中发表。