无法使敌人向玩家移动

Question

我正在努力争取这项工作。基本上，我希望我的敌方精灵追逐我的玩家精灵。此刻，它沿着对角线移动到屏幕的右下角。

我正在学习python我做了一个游戏，我仍然是新的，所以我很抱歉，如果这是一个非常简单的事情，我遇到了问题。

相关代码：

class Enemy(pygame.sprite.Sprite): 
    def __init__(self): 
     pygame.sprite.Sprite.__init__(self) 

     self.bitmap = pygame.image.load("ball.bmp") 
     self.enemy_rect = self.bitmap.get_rect() 
     self.enemy_rect.topleft = [100, 200] 
     self.speed = 2 

    def move_to_player(self, Player): 
     dx, dy = self.enemy_rect.x - player.player_rect.x, self.enemy_rect.y - player.player_rect.y 
     dist = math.hypot(dx, dy) 
     if dist == 0: 
      dist = 1 
     else: 
      dx, dy = dx/dist, dy/dist 

     self.enemy_rect.x += dx * self.speed 
     self.enemy_rect.y += dx * self.speed 

while 1: # main game loop 
enemy.move_to_player(player) 

而且所有的代码，用于上下文：

import pygame 
import sys 
import pygame.locals 
import math 

pygame.init() 

size = width, height = 800, 500 
colour = 100, 20, 30 # colour for background 

screen = pygame.display.set_mode(size) 
pygame.display.set_caption('Test') 

class Player(pygame.sprite.Sprite): 
    def __init__(self): 
     pygame.sprite.Sprite.__init__(self) 

     self.bitmap = pygame.image.load("ball.bmp") 
     self.player_rect = self.bitmap.get_rect(
     self.player_rect.topleft = [100, 200] 

    def move(self, x, y): 
     self.player_rect.centerx += x 
     self.player_rect.centery += y 

    def render(self): 
     screen.blit(self.bitmap, (self.shipRect)) 

class Enemy(pygame.sprite.Sprite): 
    def __init__(self): 
     pygame.sprite.Sprite.__init__(self) 

     self.bitmap = pygame.image.load("ball.bmp") 
     self.enemy_rect = self.bitmap.get_rect() 
     self.enemy_rect.topleft = [100, 200] 
     self.speed = 2 

    def move_to_player(self, Player): 
     dx, dy = self.enemy_rect.x - player.player_rect.x, self.enemy_rect.y - player.player_rect.y 
     dist = math.hypot(dx, dy) 
     if dist == 0: 
      dist = 1 
     else: 
      dx, dy = dx/dist, dy/dist 

     self.enemy_rect.x += dx * self.speed 
     self.enemy_rect.y += dx * self.speed 

player = Player() 
enemy = Enemy() 

player.player_rect.x = 50 
player.player_rect.y = 50 

enemy.enemy_rect.x = 500 
enemy.enemy_rect.y = 300 

while 1: # main game loop 
    for event in pygame.event.get(): 
     if event.type == pygame.QUIT: 
      sys.exit() 

     if event.type == pygame.KEYDOWN: 
      if event.key == pygame.K_DOWN: 
       player.move(0, 5) 
      if event.key == pygame.K_UP: 
       player.move(0, -5) 
      if event.key == pygame.K_LEFT: 
       player.move(-5, 0) 
      if event.key == pygame.K_RIGHT: 
       player.move(5, 0) 

     if player.player_rect.colliderect(enemy.enemy_rect): 
      pygame.display.set_caption('Hit!') 

    screen.fill(colour) 
    screen.blit(player.bitmap, player.player_rect) 
    screen.blit(enemy.bitmap, enemy.enemy_rect) 
    enemy.move_to_player(player) 
    pygame.display.flip() 

Answer 1

首先，self.enemy_rect.y += dx * self.speed大概应该是self.enemy_rect.y += dy * self.speed

其次，我觉得你有你的数学向后这样你的敌人会逃跑。让我们尝试一个简单的例子：

Player at 0,0; enemy at 2,0. 
Expected result if speed = 2: both at 0,0 
dx = 2, dy = 0 (before normalizing by hypot) 
dx = 1, dy = 0 (after) 
New result: player still at 0,0; enemy at 4,0 

Answer 2

这里，这是我用这个...

if PlayerX > AI_X: 
    AI_X += 3 
if PlayerX < AI_X: 
    AI_X -= 3 
if PlayerY > AI_Y: 
    AI_Y += 3 
if PlayerY < AI_Y: 
    AI_Y -= 3 

希望这有助于！