SFML - pollEvent雙鼠標點擊運行

Question

我主要是這樣的：

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

using namespace sf; 

int main() 
{ 
    // Create the main window 

    RenderWindow app(VideoMode::getDesktopMode(), "Okno" ,Style::Fullscreen); 
    app.setKeyRepeatEnabled(false); 
    okno aplikacja(app); 


    // Start the game loop 
    while (app.isOpen()) 
    { 
     // Process events 
     Event event; 
     event.type=Event::JoystickButtonPressed; 
     event.mouseButton.button = Mouse::Right; 
     while (app.pollEvent(event)) 
     { 

      // Close window : exit 
      if (event.type == Event::Closed) 
       app.close(); 

      if(event.type == Event::KeyPressed && event.key.code == Keyboard::Escape) 
       app.close(); 
     } 
     aplikacja.click_przyciski(event); 







    aplikacja.obsluga_przyciskow(); 
     event.type=Event::JoystickButtonPressed; 
     event.mouseButton.button = Mouse::Right; 

    aplikacja.rysuj(); 
    aplikacja.menu=true; 
     event.type=Event::JoystickButtonPressed; 
     event.mouseButton.button = Mouse::Right; 

      //sleep(seconds(5)); 

     // Update the window 
     //app.display(); 
    } 

    return EXIT_SUCCESS; 
} 

和類okno.cpp這樣的：

#include "okno.h" 

#include <iostream> 

using namespace std; 
int wyswietlanie =0; 
okno::okno(RenderWindow &app): window(app) 
{ 
    textures[0].loadFromFile("grafika/tlo.png"); 
    textures[1].loadFromFile("grafika/logo.png"); 
    textures[2].loadFromFile("grafika/siatka.png"); 
    textures[3].loadFromFile("grafika/button_start.png"); 
    textures[4].loadFromFile("grafika/button_informacje.png"); 
    textures[5].loadFromFile("grafika/button_wyjscie.png"); 
    textures[6].loadFromFile("grafika/button_cofnij.png"); 
    czcionka.loadFromFile("czcionki/czcionka_1.ttf"); 
    for (int j=0;j<i;j++) 
     sprites[j].setTexture(textures[j]); 
     float x,y; 
     x=window.getView().getSize().x; 
     y=window.getView().getSize().y; 
     tekst.setString("Projekt wykonal : \n Wojciech Sorota."); 
     tekst.setCharacterSize(30); 
     tekst.setPosition(x/10,y/10); 
     tekst.setColor(sf::Color::Red); 
     tekst.setFont(czcionka); 
     sprites[0].setScale(x/sprites[0].getTextureRect().width,y/sprites[0].getTextureRect().height); 
     sprites[1].setPosition(x/2 - sprites[1].getTextureRect().width/2,y/2 - sprites[1].getTextureRect().height/2); 
     sprites[3].setPosition(x/10,y/10); 
     sprites[2].setScale(x/2/sprites[2].getTextureRect().width,y/2/sprites[2].getTextureRect().height); 
     sprites[2].setPosition(x/8,y/4); 
     sprites[4].setPosition(x/10+ sprites[3].getPosition().x + x/ 15,y/10); 
     sprites[5].setPosition( x/10 +sprites[4].getPosition().x +x/15,y/10); 
     sprites[6].setPosition(x/10 + tekst.getPosition().x + tekst.getGlobalBounds().width,y/10); 
     menu=true; 
} 
okno::~okno() 
{} 
void okno::rysuj() 
{ 
     this->rysuj_intro(); 

     this->rysuj_menu(); 

} 
void okno::start_gra() 
{ 

} 
void okno::click_przyciski(Event &event) 
{ 
    if(event.type == Event::MouseButtonReleased && event.mouseButton.button == Mouse::Left) 

{ 

     if(click_sprite(sprites[3])) 
      start_gra(); 

     else if(click_sprite(sprites[5])) 
        window.close(); 
        else if(click_sprite(sprites[4])) 
     wyswietl_info(event); 

} 

} 
void okno::wyswietl_info(Event &event) 
{ 
{ 

    while(1) 
     { 
    if(sf::Mouse::isButtonPressed(sf::Mouse::Left) && click_sprite(sprites[6])) 
    { 
      event.type=Event::JoystickButtonPressed; 
      event.mouseButton.button = Mouse::Right; 
    return; 

    } 


    window.clear(); 
     window.draw(sprites[0]); 
     window.draw(sprites[2]); 
     window.draw(sprites[6]); 

     window.draw(tekst); 
     obsluga_przyciskow(); 
     window.display(); 

} 
}} 
bool okno::click_sprite(Sprite a) 
{ 
    // transform the mouse position from window coordinates to world coordinates 
    sf::Vector2f mouse = window.mapPixelToCoords(sf::Mouse::getPosition(window)); 
    // retrieve the bounding box of the sprite 
    sf::FloatRect bounds = a.getGlobalBounds(); 
    // hit test 
    if (bounds.contains(mouse)) 
    { 
     return true; 
    } 
    return false; 
} 
void okno::obluga_cofnij() 
{ 

} 
void okno::obsluga_przyciskow() 
{ 

if(mysz_nad_sprite(sprites[3])) 
     sprites[3].setColor(sf::Color(100,100,100)); 
      else 
       sprites[3].setColor(sf::Color(255,255,255)); 

if(mysz_nad_sprite(sprites[4])) 
     sprites[4].setColor(sf::Color(100,100,100)); 
      else 
       sprites[4].setColor(sf::Color(255,255,255)); 
if(mysz_nad_sprite(sprites[5])) 
     sprites[5].setColor(sf::Color(100,100,100)); 
      else 
       sprites[5].setColor(sf::Color(255,255,255)); 
if(mysz_nad_sprite(sprites[6])) 
     sprites[6].setColor(sf::Color(100,100,100)); 
      else 
       sprites[6].setColor(sf::Color(255,255,255)); 

} 
bool okno::mysz_nad_sprite(Sprite a) 
{ 
    sf::Vector2f mouse = window.mapPixelToCoords(sf::Mouse::getPosition(window)); 
    if (a.getGlobalBounds().contains(mouse)) 
     return true; 
    return false; 
} 
void okno::rysuj_intro() 
{ 
     if (wyswietlanie == 0) 
      { 
       for (int n=0;n<=254;n++) 
       { 
        window.clear(); 
        sprites[0].setColor(sf::Color(255, 255, 255, n)); 
        sprites[1].setColor(sf::Color(255,255,255,n)); 
        sleep(milliseconds(n/15)); 
        window.draw(sprites[0]); 
        window.draw(sprites[1]); 
        window.display(); 
       } 

       for (int n=254;n>=0;n--) 
       { 
        window.clear(); 
        sprites[1].setColor(sf::Color(255, 255, 255, n)); 
        sleep(milliseconds(n/15)); 
        window.draw(sprites[0]); 
        window.draw(sprites[1]); 
        window.display(); 
       } 
       wyswietlanie++; 
      } 


} 

    void okno::rysuj_menu() 
    { 
     window.clear(); 

     if (wyswietlanie==1) 
      for (int n=0;n<=254;n++) 
       { 
        window.clear(); 
        sprites[2].setColor(sf::Color(255,255,255,n)); 
        window.draw(sprites[0]); 
        window.draw(sprites[2]); 
        window.draw(sprites[3]); 
        window.draw(sprites[4]); 
        window.draw(sprites[5]); 
        window.display(); 
        if (n==254) 
        wyswietlanie++; 
        window.clear(); 
       } 

     window.draw(sprites[0]); 
     window.draw(sprites[2]); 
     window.draw(sprites[3]); 
     window.draw(sprites[4]); 
     window.draw(sprites[5]); 
     window.display(); 
} 

我的問題是，爲什麼在我點擊精靈[6]，然後我回到循環[pollEvent]，然後pollEvent返回最後一個事件，但最後一個事件是mouseclick soo，然後它運行鼠標點擊腳本如何保護我的功能呢？

Answer 1

SFML事件處理

活動應該如何處理這樣的事情：

sf::Event event; 

while (app.pollEvent(event)) 
{ 
    // handle each event you want 
    switch (event.type) 
    { 
    case sf::Event::Closed: 
     closed(event); 
     Exit(); 
     break; 
    case sf::Event::KeyPressed: 
     keyPressed(event); 
     break; 
    case sf::Event::KeyReleased: 
     keyReleased(event); 
     break; 
    case sf::Event::MouseButtonPressed: 
     mouseButtonPressed(event); 
     break; 
    case sf::Event::MouseButtonReleased: 
     mouseButtonReleased(event); 
     break; 
    case sf::Event::MouseMoved: 
     mouseMoved(event); 
     break; 
    /* ...many more events exist */ 
    default: 
     cerr << "unhandle event of type: " << event.type << endl; 
     break; 

    } 

} 

，然後對要處理的每個事件的函數。

void mouseMoved(const sf::Event& event) 
{ 
    // do something with the mouse event 
    mRelMousePos.x = event.mouseMove.x - mMousePos.x; 
    mRelMousePos.y = event.mouseMove.y - mMousePos.y; 
    mMousePos.x = event.mouseMove.x; 
    mMousePos.y = event.mouseMove.y; 
} 

正如mentionned由@Hiura，你無法將事件類型分配給一個sf::event，然後再用它在pollEvent方法，更準確地說，它更多的event.mouseButton.button = Mouse::Right;一部分是有問題在這裏。這部分是因爲sf::Event類將其事件參數（mouseButton，鍵等）存儲在union中，部分原因是這不是用於sf :: Event類的用途。

您的代碼

英語請碼，總是，你永遠不知道什麼時候你需要分享的一段代碼。我不是這樣說的，因爲我是一個以自我爲中心的說英語的人，事實上，我是加拿大法語。

現在，讓我們來看看您提供的代碼。

// Process events 
    Event event; 

    // these are problematic, you shouldn't do that. 
    //event.type=Event::JoystickButtonPressed; 
    //event.mouseButton.button = Mouse::Right; 

    while (app.pollEvent(event)) 
    { 
     // using a switch or else if here would lower code repetition 
     // and useless check. 

     // Since both cases do the same thing, you could have just merge them. 
     // Close window : exit 
     if ((event.type == Event::Closed) 
      || (event.type == Event::KeyPressed 
       && event.key.code == Keyboard::Escape)) 
     { 
      app.close(); 
     } 
     else if (event.type == Event::MouseButtonReleased 
        && event.mouseButton.button == Mouse::Left) 
     { 
      // this should really go here 
      aplikacja.click_button(event); // thanks Google Translation 
     } 

    } 

    // Why? Why do you send the last event from your event loop to that? 
    //aplikacja.click_przyciski(event); 

這裏一些不必要的調整隻是爲了好玩：

bool okno::click_sprite(Sprite sprite) // remember, meaningful names 
{ 
    // transform the mouse position from window coordinates to world coordinates 
    sf::Vector2f mouse = window.mapPixelToCoords(sf::Mouse::getPosition(window)); 

    // see how it's clearer and I just removed 7-8 LOC and the comments 
    // are now unnecessary here. The if clause was redundant since the contains 
    // method already returns a bool value. 
    return sprite.getGlobalBounds().contains(mouse); 
} 

我不會去通過整個代碼，但你接近與SFML一個工作程序。有一些很好的教程，SFML源代碼非常清晰，請參閱SFML Github repo和SFML game dev book以獲取有關如何使用SFML每個部分的更多信息。