Pythonを使ってミサイルの自動追尾を実装、超燃える！

import pygame,sys
from math import *
pygame.init()
screen=pygame.display.set_mode((800,700),0,32)
missile=pygame.image.load('element/red_pointer.png').convert_alpha()
x1,y1=100,600 #导弹的初始发射位置
velocity=800#导弹速度
time=1/1000 #每个时间片的长度
clock=pygame.time.Clock()
old_angle=0
while True:
for event in pygame.event.get():
if event.type==pygame.QUIT:
sys.exit()
clock.tick(300)
x,y=pygame.mouse.get_pos()#获取鼠标位置，鼠标就是需要打击的目标
distance=sqrt(pow(x1-x,2)+pow(y1-y,2))#两点距离公式
section=velocity*time #每个时间片需要移动的距离
sina=(y1-y)/distance
cosa=(x-x1)/distance
angle=atan2(y-y1,x-x1)#两点线段的弧度值
x1,y1=(x1+section*cosa,y1-section*sina)
d_angle = degrees(angle)#弧度转角度
screen.blit(missile, (x1-missile.get_width(), y1-missile.get_height()/2))
dis_angle=d_angle-old_angle#dis_angle就是到下一个位置需要改变的角度
old_angle=d_angle#更新初始角度
pygame.display.update()

missiled = pygame.transform.rotate(missile, -(d_angle))
screen.blit(missiled, (x1-missile.get_width(), y1-
missile.get_height()/2))

screen.blit(missiled, (x1-width+(x1-C[0]),y1-height/2+(y1-C[1])))

import pygame,sys
from math import *
pygame.init()
font1=pygame.font.SysFont('microsoftyaheimicrosoftyaheiui',23)
textc=font1.render('*',True,(250,0,0))
screen=pygame.display.set_mode((800,700),0,32)
missile=pygame.image.load('element/rect1.png').convert_alpha()
height=missile.get_height()
width=missile.get_width()
pygame.mouse.set_visible(0)
x1,y1=100,600 #导弹的初始发射位置
velocity=800#导弹速度
time=1/1000 #每个时间片的长度
clock=pygame.time.Clock()
A=()
B=()
C=()
while True:
for event in pygame.event.get():
if event.type==pygame.QUIT:
sys.exit()
clock.tick(300)
x,y=pygame.mouse.get_pos()#获取鼠标位置，鼠标就是需要打击的目标
distance=sqrt(pow(x1-x,2)+pow(y1-y,2))#两点距离公式
section=velocity*time #每个时间片需要移动的距离
sina=(y1-y)/distance
cosa=(x-x1)/distance
angle=atan2(y-y1,x-x1)#两点间线段的弧度值
fangle=degrees(angle) #弧度转角度
x1,y1=(x1+section*cosa,y1-section*sina)
missiled=pygame.transform.rotate(missile,-(fangle))
if 0<=-fangle<=90:
A=(width*cosa+x1-width,y1-height/2)
B=(A[0]+height*sina,A[1]+height*cosa)
if 90<-fangle<=180:
A = (x1 - width, y1 - height/2+height*(-cosa))
B = (x1 - width+height*sina, y1 - height/2)
if -90<=-fangle<0:
A = (x1 - width+missiled.get_width(), y1 - height/2+missiled.get_height()-height*cosa)
B = (A[0]+height*sina, y1 - height/2+missiled.get_height())
if -180<-fangle<-90:
A = (x1-width-height*sina, y1 - height/2+missiled.get_height())
B = (x1 - width,A[1]+height*cosa )
C = ((A[0] + B[0]) / 2, (A[1] + B[1]) / 2)
screen.fill((0,0,0))
screen.blit(missiled, (x1-width+(x1-C[0]),y1-height/2+(y1-C[1])))
screen.blit(textc, (x,y)) #鼠标用一个红色*代替
pygame.display.update()