Question

我想编制游戏。我已经设定了敌人和玩家。每当游戏反对时，无论是敌人还是玩家，无论是左侧和上方，右侧还是顶部，左侧和底部，还是右侧和底部，都无论是敌人还是玩家，游戏对象都会移动到场外。

还有第二个问题。有时，敌人会在场地边缘短时间内停留

#include <Windows.h>
#include <SFML/Graphics.hpp>
#include <vector>
#include <ctime>
#include <cstdlib>
#include "Player.hpp"
#include "Square.hpp"

#define WIDTH 800
#define HEIGHT 600

bool kUp = false, kDown = false, kLeft = false, kRight = false;

Player player(WIDTH / 2 - 10, HEIGHT / 2 - 10, 10, sf::Color::Green);
std::vector<Square> squares(10);

sf::RenderWindow window;

void update(float elapsedTime) {
    if (kUp == true) player.move(0, -300.0f * elapsedTime);
    if (kDown == true) player.move(0, 300.0f * elapsedTime);
    if (kLeft == true) player.move(-300.0f * elapsedTime, 0);
    if (kRight == true) player.move(300.0f * elapsedTime, 0);

    sf::Vector2f playerPos = player.getPosition();
    if (playerPos.x < 0) player.setPosition(0, playerPos.y);
    if (playerPos.y < 0) player.setPosition(playerPos.x, 0);
    if (playerPos.x > WIDTH - 20) player.setPosition(WIDTH - 20, playerPos.y);
    if (playerPos.y > HEIGHT - 20) player.setPosition(playerPos.x, HEIGHT - 20);

    for (int i = 0; i < squares.size(); ++i) {
        sf::Vector2f squareSpeed = squares[i].getSpeed();
        squares[i].move(squareSpeed.x * elapsedTime, squareSpeed.y * elapsedTime);

        sf::Vector2f squarePos = squares[i].getPosition();
        if (squarePos.x < 0) squares[i].setSpeed(-squareSpeed.x, squareSpeed.y);
        if (squarePos.y < 0) squares[i].setSpeed(squareSpeed.x, -squareSpeed.y);
        if (squarePos.x > WIDTH - 5) squares[i].setSpeed(-squareSpeed.x, squareSpeed.y);
        if (squarePos.y > HEIGHT - 5) squares[i].setSpeed(squareSpeed.x, -squareSpeed.y);
    }
}

void draw() {
    for (int i = 0; i < squares.size(); ++i) {
        window.draw(squares[i]);
    }

    window.draw(player);
}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow) {
    sf::ContextSettings settings;
    settings.antialiasingLevel = 8;

    window.create(sf::VideoMode(WIDTH, HEIGHT), "Runner - The Red Squares", sf::Style::Titlebar | sf::Style::Close, settings);
    window.setVerticalSyncEnabled(true);

    srand(time(0));
    for (int i = 0; i < squares.size(); ++i) {
        squares[i] = Square(rand() % WIDTH, rand() % HEIGHT, 5, 5, sf::Color::Red);
    }

    sf::Clock clock;
    while (window.isOpen()) {
        sf::Time elapsedTime = clock.restart();

        window.clear(sf::Color::Black);

        update(elapsedTime.asSeconds());
        draw();

        window.display();

        sf::Event evt;
        while (window.pollEvent(evt)) {
            if (evt.type == sf::Event::Closed) {
                window.close();
            }

            if (evt.type == sf::Event::KeyPressed) {
                if (evt.key.code == sf::Keyboard::Up) kUp = true;
                if (evt.key.code == sf::Keyboard::Down) kDown = true;
                if (evt.key.code == sf::Keyboard::Left) kLeft = true;
                if (evt.key.code == sf::Keyboard::Right) kRight = true;
            }

            if (evt.type == sf::Event::KeyReleased) {
                if (evt.key.code == sf::Keyboard::Up) kUp = false;
                if (evt.key.code == sf::Keyboard::Down) kDown = false;
                if (evt.key.code == sf::Keyboard::Left) kLeft = false;
                if (evt.key.code == sf::Keyboard::Right) kRight = false;
            }
        }

        sf::sleep(sf::milliseconds(15));
    }

    return 0;
}

有谁知道我做错了什么？

感谢您的帮助

Answer 1

问题是因为您正在使用播放器位置的副本（存储在playerPos中），同时还更新当前玩家位置（使用player.getPosition()）。如果x和y位置均为负数，则您最初会将玩家x位置设置为0.在下一行中，由于y为负数，因此您需要设置玩家的位置为0 y，但旧的仍然是副本 x位置。

有几种可能的解决方案，包括始终获取玩家位置（而不是使用副本）或添加仅设置玩家x或y位置的方法，而无需同时设置两者。 / p>

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