我们如何通过xml获得形状的坐标？

Question

读取鼠标坐标值成功。但是我需要通过xml读取存储的坐标值。

值是使用ElementTree检索的。但是一旦你把它放到一个数组中，坐标的形状是x，y，所以中间的逗号阻止了整数转换。它是一个字符串，所以它的两端都是撇号，所以你不能转换它。请给我提个建议。

<?xml version='1.0' encoding='utf-8'?>
<DA>
    <DetectionAreas>2</DetectionAreas>
    <DetectArea>
        <Point>0,0</Point>
        <Point>1280,0</Point>
        <Point>1280,720</Point>
        <Point>0,720</Point>
    </DetectArea>
    <Loitering>
        <Point>625,564</Point>
        <Point>625,0</Point>
        <Point>1280,0</Point>
        <Point>1280,631</Point>
    </Loitering>
</DA>

import xml.etree.ElementTree as ET

tree = ET.parse('./MapFile/C001101.map')
root = tree.getroot()
DetectPoint = root.getchildren()[1]
LoiteringPoint = root.getchildren()[2] 
IntrusionPoint = root.getchildren()[2]
Ipointvalue = []
Lpointvalue = []
Dpointvalue = []


if DetectPoint.tag == 'DetectArea' :
    for DPoint in root.findall("DetectArea/Point") :
        Dpointvalue.append(DPoint.text)
if LoiteringPoint.tag == 'Loitering' :
    for LPoint in root.findall("Loitering/Point") :        
        Lpointvalue.append(LPoint.text)
elif IntrusionPoint.tag == 'Intrusion' :
    for IPoint in root.findall("Intrusion/Point") :
        Ipointvalue.append(IPoint.text) 

ip = len(Ipointvalue)
lp = len(Lpointvalue)
dp = len(Dpointvalue)

for i in range(dp): 
    Dpointvalue[i]
    print(Dpointvalue[i])
for i in range(lp):
    Lpointvalue[i]
    print(Lpointvalue[i])
for i in range(ip):
    Ipointvalue[i]
    print(Ipointvalue[i])   

'
'
'
    def onMouseCallback(self, event, x, y, flags, idx):
        if self.view_state == 'intrusion append' or self.view_state == 'loitering append' or self.view_state == 'counting append':
            if event == cv2.EVENT_LBUTTONUP and flags == cv2.EVENT_FLAG_LBUTTON:
                works[idx].area_tmp.append([x, y])
                #print(works[idx].area_tmp)
                #print(Dpointvalue)

要创建折线，我想要的坐标值是x和y，但我想请教一下，因为它被识别为'x，y‘。

Answer 1

定义一个名为Point的'namedtuple‘。此对象具有两个int属性x和y。有一个辅助方法可帮助您将所拥有的数据(x和y作为字符串)转换为Point对象

见下文

from collections import namedtuple

Point = namedtuple('Point','x y')

def make_point(point_str):
    parts = point_str.split(',')
    return Point(int(parts[0]),int(parts[1]))


point_str = '3,4'
point = make_point(point_str)
print(point)
print(point.x)
print(point.y)

输出

Point(x=3, y=4)
3
4

现在，您的代码可能如下所示：

...
Lpointvalue.append(make_point(LPoint.text))
...