python中实现根据坐标点位置求方位角

from PyQt5.QtGui import *
from PyQt5.QtWidgets import *
from PyQt5.QtCore import Qt
from PyQt5.QtWidgets import QApplication, QLabel, QWidget, QVBoxLayout
import sys
import math
class Example(QWidget):
    def __init__(self):
        super().__init__()
        self.initUI()
    def initUI(self):
        self.resize(500, 250)
        self.setWindowTitle("坐标系")
        self.lb = QLabel("点1到原点距离：", self)
        self.lb.move(20, 40)
        self.lb2 = QLabel("点1与原点的角度：", self)
        self.lb2.move(20, 80)
        self.lb3 = QLabel("点2到原点距离：", self)
        self.lb3.move(20, 120)
        self.lb4 = QLabel("点2与原点的角度：", self)
        self.lb4.move(20, 160)
        self.bt1 = QPushButton('查询', self)
        self.bt1.move(20, 200)
        self.edit = QLineEdit('', self)
        self.edit.move(150, 40)
        self.edit2 = QLineEdit('', self)
        self.edit2.move(150, 80)
        self.edit3 = QLineEdit('', self)
        self.edit3.move(150, 120)
        self.edit4 = QLineEdit('', self)
        self.edit4.move(150, 160)
        self.bt1.clicked.connect(self.calc_angle)
        self.show()
    def calc_angle(self):
        x1 = float(self.edit.text()) * math.cos(math.radians(int(self.edit2.text())))
        y1 = float(self.edit.text()) * math.sin(math.radians(int(self.edit2.text())))
        x2 = float(self.edit3.text()) * math.cos(math.radians(int(self.edit4.text())))
        y2 = float(self.edit3.text()) * math.sin(math.radians(int(self.edit4.text())))
        angle = 0
        dy = y2 - y1
        dx = x2 - x1
        if dx == 0 and dy > 0:
            angle = 90
            print('顺时针：', angle, '°')
        if dx == 0 and dy < 0:
            angle = 270
            print('顺时针：', angle, '°')
        if dy == 0 and dx > 0:
            angle = 0
            print('顺时针：', angle, '°')
        if dy == 0 and dx < 0:
            angle = 180
            print('顺时针：', angle, '°')
        if dx > 0 and dy > 0:
            angle = math.atan(dy / dx)* 180 / math.pi
            print('东偏北：',angle,'°')
        elif dx < 0 and dy > 0:
            angle = 90 - math.atan(dy / abs(dx))* 180 / math.pi
            print('北偏西：', angle, '°')
        elif dx < 0 and dy < 0:
            angle = math.atan(dy / dx)* 180 / math.pi
            print('西偏南：', angle, '°')
        elif dx > 0 and dy < 0:
            angle = math.atan(abs(dy) / dx)* 180 / math.pi
            print('东偏南：', angle, '°')
        length = math.sqrt(dy * dy + dx * dx)
        print(length)
if __name__ == '__main__':
    app = QApplication(sys.argv)
    ex = Example()
    sys.exit(app.exec_())

# 计算方位角函数
def azimuthAngle( x1, y1, x2, y2):
  angle = 0.0;
  dx = x2 - x1
  dy = y2 - y1
  if x2 == x1:
    angle = math.pi / 2.0
    if y2 == y1 :
      angle = 0.0
    elif y2 < y1 :
      angle = 3.0 * math.pi / 2.0
  elif x2 > x1 and y2 > y1:
    angle = math.atan(dx / dy)
  elif x2 > x1 and y2 < y1 :
    angle = math.pi / 2 + math.atan(-dy / dx)
  elif x2 < x1 and y2 < y1 :
    angle = math.pi + math.atan(dx / dy)
  elif x2 < x1 and y2 > y1 :
    angle = 3.0 * math.pi / 2.0 + math.atan(dy / -dx)
  return (angle * 180 / math.pi)

#计算角度
print(white_point)
if white_point[0][0]>white_point[1][0]:
    x1=white_point[1][0];
    y1=white_point[1][1];
    x2=white_point[0][0];
    y2=white_point[0][1];
else:
    x1=white_point[0][0];
    y1=white_point[0][1];
    x2=white_point[1][0];
    y2=white_point[1][1];
angle = 90-azimuthAngle(x1,y1,x2,y2)
print("angle:"+str(angle))