Question

当您按住空格键3秒钟时，我想给我的Sprite额外的速度。之后，您应该等待10秒，然后再次使用。我尝试使用SFML的时间，但是程序启动时时钟立即开始，所以无论如何都会开始。...

简短的问题：如何在不像Sleep（）那样冻结程序的情况下延迟功能。

代码（仅适用于开发进度缓慢的控制台）：

#include "SFML/Graphics.hpp"
#include <iostream>
#include <Windows.h>

int main()
{
using namespace std;
sf::Clock ClockSpeedFunc, Cooldown;
ClockSpeedFunc.restart();
bool Timer, CooldownTimer = false;
sf::RenderWindow window(sf::VideoMode(600, 600), "SFML WORK!");
sf::Texture texture;

if (!texture.loadFromFile("PlayerTexture.jpg"))
{
    std::cout << "Error loading PlayerTexture.jpg" << std::endl;
}

sf::Sprite sprite;
sprite.setTexture(texture);

sprite.setPosition(sf::Vector2f(50, 40));
sprite.setPosition(sf::Vector2f(50, 40));
sprite.setPosition(sf::Vector2f(50, 40));
sprite.setPosition(sf::Vector2f(50, 40));
float PlayerSpeed = 0.1;

while (window.isOpen())
{
    sf::Event event;
    while (window.pollEvent(event))
    {
        switch (event.type)
        {
        case sf::Event::Closed:
            window.close();

            break;

        }
    }
    //###Controls ::
    //If W is pressed, move upwards
    if (sf::Keyboard::isKeyPressed(sf::Keyboard::W)) {
        sprite.move(sf::Vector2f(0, -PlayerSpeed));
    }
    //If A is pressed, move left
    if (sf::Keyboard::isKeyPressed(sf::Keyboard::A)) {
        sprite.move(sf::Vector2f(-PlayerSpeed, 0));
    }
    //If S is pressed, move downwards
    if (sf::Keyboard::isKeyPressed(sf::Keyboard::S)) {
        sprite.move(sf::Vector2f(0, PlayerSpeed));
    }
    //If D is pressed, move right
    if (sf::Keyboard::isKeyPressed(sf::Keyboard::D)) {
        sprite.move(sf::Vector2f(PlayerSpeed, 0));
    }
    //If Space is pressed, set Timer to true and set Speed to 0.5
    if (sf::Keyboard::isKeyPressed(sf::Keyboard::Space) && CooldownTimer == false) {
        cout << "Turbo started" << endl;
        Timer = true;
        CooldownTimer == false;
        PlayerSpeed = 0.5;
    }
    //If Timer = true, start a clock
    if (Timer = true) {
        sf::Clock ClockSpeedFunc;
    }
    //aafter 3 Seconds set Playerspeed back to 0.1
    //Set Cooldowntimer to true and restart timer clock.


        sf::Time elapsed1 = ClockSpeedFunc.getElapsedTime();
        sf::Time elapsed2 = Cooldown.getElapsedTime();

    if (elapsed1.asSeconds() >= 3) {
            PlayerSpeed = 0.1;
            cout << "Turbo ended." << endl;
            ClockSpeedFunc.restart();
            CooldownTimer = true;
    }if (CooldownTimer == true) {
        cout << "Cooldown started" << endl;
        sf::Clock Cooldown;
    }if (elapsed2.asSeconds() >= 10) {
        cout << "Cooldown ended" << endl;
        Cooldown.restart();
        CooldownTimer = false;
    }

    //Draw everything
    window.clear();
    window.draw(sprite);
    window.display();
}

}`

Answer 1

首先，请确保您不使用“使用命名空间”。那是个坏习惯。以及为什么要在其中包含#include。我不需要它。

这不是问题的一部分，但我强烈建议您查看https://gafferongames.com/post/fix_your_timestep/并管理您的增量时间。

我想我会为此使用一个类。但是在这里您可以看到如何将其与状态结合使用。我在代码中添加了一些注释，以便您可以看到我的工作。

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

// Define the different states of the player
enum class m_State{
  POWERUP, NORMAL, COOLDOWN
};

int main(){
  sf::Clock m_Clock;

  // Record elapsed time of power up
  float m_SecondsSincePowerUp;

  // Set initial state
  m_State m_State = m_State::NORMAL;

  sf::RenderWindow window(sf::VideoMode(600, 600), "SFML WORK!");
  sf::Texture texture;

  if (!texture.loadFromFile("PlayerTexture.jpg")){
      std::cout << "Error loading PlayerTexture.jpg" << std::endl;
  }

  sf::Sprite sprite;
  sprite.setTexture(texture);

  sprite.setPosition(sf::Vector2f(50, 40));
  sprite.setPosition(sf::Vector2f(50, 40));
  sprite.setPosition(sf::Vector2f(50, 40));
  sprite.setPosition(sf::Vector2f(50, 40));
  float PlayerSpeed = 0.1;

  while (window.isOpen()){
    sf::Time elapsedTime = m_Clock.restart();
    sf::Event event;
    while (window.pollEvent(event)){
      switch (event.type){
        case sf::Event::Closed:
          window.close();
          break;
        }
    }
    //###Controls ::
    //If W is pressed, move upwards
    if (sf::Keyboard::isKeyPressed(sf::Keyboard::W)) {
        sprite.move(sf::Vector2f(0, -PlayerSpeed));
    }
    //If A is pressed, move left
    if (sf::Keyboard::isKeyPressed(sf::Keyboard::A)) {
        sprite.move(sf::Vector2f(-PlayerSpeed, 0));
    }
    //If S is pressed, move downwards
    if (sf::Keyboard::isKeyPressed(sf::Keyboard::S)) {
        sprite.move(sf::Vector2f(0, PlayerSpeed));
    }
    //If D is pressed, move right
    if (sf::Keyboard::isKeyPressed(sf::Keyboard::D)) {
        sprite.move(sf::Vector2f(PlayerSpeed, 0));
    }
    //If Space is pressed, set Timer to true and set Speed to 0.5
    if (sf::Keyboard::isKeyPressed(sf::Keyboard::Space) && (m_State == m_State::NORMAL)){
        std::cout << "Turbo started" << std::endl;
        // Set state to PowerUp
        m_State = m_State::POWERUP;
        PlayerSpeed = 0.5;
    }

    // If state is PowerUp count the seconds in a variable
    if (m_State == m_State::POWERUP){
      // Add elapsed time in seconds
      m_SecondsSincePowerUp += elapsedTime.asSeconds();

      // After 3 seconds switch the state to Cooldown
      if (m_SecondsSincePowerUp > 3.0f){
        std::cout << "Turbo ended." << std::endl;
        m_State = m_State::COOLDOWN;
        PlayerSpeed = 0.1;
      }
    }

    // After 10 seconds switch to normal
    if (m_State == m_State::COOLDOWN){
      m_SecondsSincePowerUp += elapsedTime.asSeconds();
      if (m_SecondsSincePowerUp > 10.0f){
        std::cout << "Cooldown ended." << std::endl;
        m_State = m_State::NORMAL;
        m_SecondsSincePowerUp = 0;
      }
    }

    //Draw everything
    window.clear();
    window.draw(sprite);
    window.display();
  }
}

Answer 2

您可以使用线程创建睡眠，而普通代码继续一致地继续执行。对于完整的解释来说，它们非常复杂，但请查看示例，看看是否值得尝试将其实现。

C ++（SFML？）在不冻结整个程序的情况下激活x秒钟

2 个答案: