如何在 Pygame 中朝鼠标方向发射子弹

在 Pygame 中，可以创建一颗朝鼠标方向发射的子弹。为此，需要创建一个代表子弹的类，并根据鼠标位置设置其初始位置和方向。

子弹的类

首先，为项目符号创建一个类。该类应包含子弹的位置、大小和表面的属性。表面就是将在屏幕上渲染的内容。

import pygame

class Bullet:
    def __init__(self, x, y):
        self.x = x
        self.y = y
        self.height = 7
        self.width = 2
        self.bullet = pygame.Surface((self.width, self.height))
        self.bullet.fill((255, 255, 255))

游戏类函数

接下来，为游戏创建一个类。该类将包含射击和生成子弹的函数。

class Game:
    def __init__(self):
        self.bullets = []
    
    def shoot_bullet(self):
        mouse_x, mouse_y = pygame.mouse.get_pos() # Get the mouse position
        for bullet in self.bullets:
            rise = mouse_y - bullet.y # Calculate the difference between mouse and bullet y position
            run = mouse_x - bullet.x # Calculate the difference between mouse and bullet x position
            angle = math.atan2(rise, run) # Calculate the angle between mouse and bullet

            bullet.x  = math.cos(angle) * 10 # Update bullet x position
            bullet.y  = math.sin(angle) * 10 # Update bullet y position

            # Rotate and draw the bullet
            rotated_bullet = pygame.transform.rotate(bullet.bullet, -math.degrees(angle))
            screen.blit(rotated_bullet, (bullet.x, bullet.y))

    def generate_bullet(self):
        mouse_buttons = pygame.mouse.get_pressed() # Check if mouse is clicked
        if mouse_buttons[0]: # If left mouse button is clicked
            self.bullets.append(Bullet(player.x, player.y)) # Create a new bullet

使用Bullet Class

在主游戏循环中，创建 Game 类的实例并调用shoot_bullet 和generate_bullet 函数。

game = Game()

while running:
    # Event handling

    # Update
    game.shoot_bullet()
    game.generate_bullet()
    
    # Draw
    screen.fill((0, 0, 0))
    for bullet in game.bullets:
        screen.blit(bullet.bullet, (bullet.x, bullet.y))
    pygame.display.update()

此代码将创建一个朝鼠标方向发射的子弹。子弹会移动直到离开屏幕。