更改KML中的标签id属性(Simplekml)

Question

是否可以在simplekml中更改标记中的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，在某些标记中，id属性看起来就像是从某个simplekml索引生成的一样。我需要将分配给<Style id="5">标记的ID更改为<Style id="icon-1532-0288D1-nodesc-normal">

这会改变Google My Maps上的图标。我如何使用simplekml来做这件事？

Answer 1

在入门文档https://simplekml.readthedocs.io/en/latest/gettingstarted.html中，id标签对于不同类型的对象是不同的生成方式，即'feat_1'，'feat_2'，'geom_0'：

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

下面是生成的代码：

<?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 = {}

由于某些原因，这些id标记被设计为只读：

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

一种可以改变这一点的hack-y方法类似于(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 = {}

但这将为您的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>

希望这能帮助你理解。不是一个句号的答案，但太长了，无法在评论中发表。