C++ 中的 SFML 播放器移动帮助

Question

我对 sfml 完全陌生，所以我一直在关注 youtube 上的教程。我和那个人做的一模一样，但我的动作仍然有问题。

基本上发生的事情是，如果我按下一个移动键，播放器（只是一个矩形）就会移动一点，当我松开键时，播放器 returns 到它的官方位置。为什么它 returns 到它的官方位置。即使我按下键再长它也不会移动超过一次。

这是我的代码：

#include <SFML/Graphics.hpp>
#include <iostream>

using namespace std;
int main()
{

sf::RenderWindow window(sf::VideoMode(512, 512), "SFML Tutorial", sf::Style::Close | sf::Style::Titlebar| sf::Style::Resize);

//Game Loop

 while(window.isOpen())
    {

        //create an event
        sf::Event evnt;
       //create a rectangle shape called player
        sf::RectangleShape player(sf::Vector2f(100.0f, 100.0f));
        player.setFillColor(sf::Color::Red);
        while(window.pollEvent(evnt))
            {
                switch(evnt.type)
                {
                case sf::Event::Closed:
                    window.close();
                    break;
                case sf::Event::Resized:
                    cout<<"New window width: "<<evnt.size.width<<" New window height: "<<evnt.size.height<<endl;
                    break;
                case sf::Event::TextEntered:
                    if(evnt.text.unicode < 128){
                    printf("%c", evnt.text.unicode);
                    }
                }

            } //window event

            if(sf::Keyboard::isKeyPressed(sf::Keyboard::Key::Left))
                {
                   player.move(-5.0f, 0.0f);
                }
            else if(sf::Keyboard::isKeyPressed(sf::Keyboard::Key::Right))
                {
                    player.move(5.0f, 0.0f);
                }
            else if(sf::Keyboard::isKeyPressed(sf::Keyboard::Key::Up))
                {
                    player.move(0.0f, -5.0f);
                }
            else if(sf::Keyboard::isKeyPressed(sf::Keyboard::Key::Down))
                {
                    player.move(0.0f, 5.0f);
                }


            //display player

            window.clear();
            window.draw(player);
            window.display();
    }
    return 0;

}

Answer 1

问题是您在 100.0f 100.0f 的 while 循环中每帧创建一个角色。因此，您需要将创建角色的代码移出 while 循环。

int main()
{
    sf::RectangleShape player(sf::Vector2f(100.0f, 100.0f)); 
    player.setFillColor(sf::Color::Red);
    while(window.isOpen())
        {

             //create an event
             sf::Event evnt;
             //create a rectangle shape called player

             while(window.pollEvent(evnt))
             ...
        }
}

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