如何在SDL 2.0 C++中使用操纵杆的数字键盘

How to use a digital pad of a joystick with SDL 2.0 C++

本文关键字：操纵杆 键盘 数字 C++ SDL      更新时间：2023-10-16

我尝试使用SDL来映射类似于xbox360游戏板的游戏板。现在使用按钮我使用这个代码：

std::vector<bool> tempButtons;
                for (int j = 0; j < SDL_JoystickNumButtons(joy); j++)
                {
                    tempButtons.push_back(false);
                }
                m_buttonStates.push_back(tempButtons);

joy是SDL_Joycle*，m_buttonStates是一个向量。不幸的是，这个功能不能映射数字键盘的4个按钮，我现在不知道为什么。。。这是我的游戏手柄：http://www.trust.com/it-it/all-products/17518-gxt-530-dual-stick-gamepad谢谢你，很抱歉我的英语不太好

谢谢lago Silva，但经过一些测试，我解决了这个代码的问题：

void InputHandler::Update() {
SDL_Event e;
while (SDL_PollEvent(&e)){
    m_keyState = SDL_GetKeyboardState(NULL);
    {
        switch (e.type)
        {
        case SDL_QUIT:TheGame::Instance()->Quit(); break;
        case SDL_KEYDOWN:KeyboardButtonDown(); break;
        case SDL_KEYUP:KeyboardButtonUp(); break;
        case SDL_JOYAXISMOTION:JoyAxisMotion(e); break;
        case SDL_JOYBUTTONDOWN:JoyButtonDown(e); break;
        case SDL_JOYBUTTONUP:JoyButtonUp(e); break;
        case SDL_JOYHATMOTION:JoyHatMotion(e); break;       //this is the code that I have implemented
        case SDL_MOUSEBUTTONDOWN:MouseButtonDown(e); break;
        case SDL_MOUSEBUTTONUP:MouseButtonUp(e); break;
        case SDL_MOUSEMOTION:MouseMotion(e); break;
        default:break;
        }
    }
}}

代码JoyHatMotion（e）调用这个函数：

void InputHandler::JoyHatMotion(SDL_Event e){
int whichOne = e.jaxis.which;
switch (e.jhat.value)
{
case SDL_HAT_DOWN:m_joyHatValues[whichOne]->Sety(1); m_joyHatValues[whichOne]->Setx(0); break;
case SDL_HAT_CENTERED:m_joyHatValues[whichOne]->Setx(0); m_joyHatValues[whichOne]->Sety(0); break;
case SDL_HAT_LEFTDOWN:m_joyHatValues[whichOne]->Setx(-1); m_joyHatValues[whichOne]->Sety(1); break;
case SDL_HAT_LEFT:m_joyHatValues[whichOne]->Setx(-1); m_joyHatValues[whichOne]->Sety(0); break;
case SDL_HAT_LEFTUP:m_joyHatValues[whichOne]->Setx(-1); m_joyHatValues[whichOne]->Sety(-1); break;
case SDL_HAT_UP:m_joyHatValues[whichOne]->Setx(0); m_joyHatValues[whichOne]->Sety(-1); break;
case SDL_HAT_RIGHTUP:m_joyHatValues[whichOne]->Setx(1); m_joyHatValues[whichOne]->Sety(-1); break;
case SDL_HAT_RIGHT:m_joyHatValues[whichOne]->Setx(1); m_joyHatValues[whichOne]->Sety(0); break;
case SDL_HAT_RIGHTDOWN:m_joyHatValues[whichOne]->Setx(1); m_joyHatValues[whichOne]->Sety(1); break;
}}

请注意，m_joyHatValues是Vector2D*

class Vector2D{private:
float x;
float y;

公共：Vector2D（float_x，float_y）：x（_x），y（_y）｛｝

float Getx(){ return x; }
float Gety(){ return y; }
void Setx(float _x){ this->x = _x; }
void Sety(float _y){ this->y = _y; }
float Length(){ return sqrt((x*x) + (y*y)); }       //la distanza dall'origine
Vector2D operator+(const Vector2D&v2)const{ return Vector2D(this->x + v2.x, this->y + v2.y); }
friend Vector2D operator+=(Vector2D& v1, const Vector2D& v2){ v1.x += v2.x; v1.y += v2.y; return v1; }
Vector2D operator- (const Vector2D&v2)const{ return Vector2D(this->x - v2.x, this->y - v2.y); }
friend Vector2D operator-=(Vector2D& v1, const Vector2D&v2){ v1.x -= v2.x; v1.y -= v2.y; return v1; }
Vector2D operator*(float scala){ return Vector2D(this->x*scala, this->y*scala); }
Vector2D& operator*=(float scala){ this->x *= scala; this->y *= scala; return *this; }
Vector2D operator/(float scala){ return Vector2D(this->x / scala, this->y / scala); }
Vector2D& operator/=(float scala){ this->x /= scala; this->y /= scala; return *this; }
void Normalize();       //porta la distanza a 0 moltiplicanto il vector2D per il suo reciproco

}；

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