Question

我正在使用C ++和SFML制作自上而下的僵尸射击游戏。现在，我有一个可以移动的可以射击的球员，但是我正在尝试为僵尸提供基本的AI，该僵尸可以根据玩家的位置追逐该玩家。

由于某种原因，僵尸在直线移动，而不是追逐玩家。我认为问题与用于计算僵尸方向的错误玩家位置有关。在僵尸类中使用玩家类的位置值时，我的玩家位置始终为0。

但是我似乎无法弄清楚如何解决该问题。任何帮助将不胜感激。谢谢！

到目前为止，这是我的代码：

Player.cpp

//GetPosition() is getting player position
//I even tried getting output of player's x and y position in this class and 
//its correctly showing player's position
sf::Vector2f Player::GetPosition()
{
  xPos = playerSprite.getPosition().x;
  yPos = playerSprite.getPosition().y;

  sf::Vector2f position = sf::Vector2f(xPos, yPos);

  //Correctly outputs position
  std::cout << "X: " << position.x << " Y: " << position.y << std::endl;

  return position;
}

Zombie.h

#pragma once
#include <SFML/Graphics.hpp>
#include "Player.h"
class Zombie
{
public:
  Zombie();

  //Here I am trying to create a player object to access player position 
  //variable to use for Zombie direction calculations
  Player p1;
  Player *player = &p1;

  sf::Texture zombieTexture;
  sf::Sprite zombieSprite;

  sf::Vector2f zombiePosition;
  sf::Vector2f playerPosition;
  sf::Vector2f direction;
  sf::Vector2f normalizedDir;

  int xPos;
  int yPos;
  float speed;
  void Move();

};

Zombie.cpp

void Zombie::Move()
{

// Make movement
xPos = zombieSprite.getPosition().x;
yPos = zombieSprite.getPosition().y;

zombiePosition = sf::Vector2f(xPos, yPos);

playerPosition = player->GetPosition();

//Incorrectly outputs player position
//This outputs 0 constantly. But why?
std::cout << "X: " << playerPosition.x << " Y: " << 
playerPosition.y << std::endl;

direction = playerPosition - zombiePosition;
normalizedDir = direction / sqrt(pow(direction.x, 2) + pow(direction.y, 2));

speed = 2;

//Rotate the Zombie relative to player position
const float PI = 3.14159265;

float dx = zombiePosition.x - playerPosition.x;
float dy = zombiePosition.y - playerPosition.y;

float rotation = (atan2(dy, dx)) * 180 / PI;
zombieSprite.setRotation(rotation + 45);

sf::Vector2f currentSpeed = normalizedDir * speed;

zombieSprite.move(currentSpeed);
}

Answer 1

僵尸如何知道要追逐哪个玩家？在您的Zombie类中，您有一个成员p1，该成员从未移动过，player始终指向该成员。可能您需要的是功能

void Zombie::chasePlayer(Player* p)
{
   player = p;
}

然后在main.cpp中添加一行

zombie.chasePlayer(&player);

更一般而言，您可能希望检查哪个是最接近的玩家，然后追逐那个玩家。

如何正确引用C ++中其他类的类对象？

1 个答案: