输出结果
https://img-blog.csdn.net/20180501120414824
实现代码
#Py之pygame：利用pygame库实现鱼儿自动实时目标跟踪
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('F:/File_Python/Resources/fish02.png').convert_alpha()
height=missile.get_height()
width=missile.get_width()
pygame.mouse.set_visible(0)
x1,y1=100,600 #鱼儿初始位置
velocity=800 #鱼儿速度
time=1/1000
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，鼠标就是鱼儿游过去的目标
distance=sqrt(pow(x1-x,2)+pow(y1-y,2))
section=velocity*time
sina=(y1-y)/distance
cosa=(x-x1)/distance
angle=atan2(y-y1,x-x1)
fangle=degrees(angle)
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))
pygame.display.update()
