2D_game_Command - 8BitsCoding/RobotMentor GitHub Wiki

Command Pattern

명령자체를 오브젝트로 만들어보자.

키보드 입력에 따른 처리를 만드려한다.

void update() override
{
    // move tank
    if (isKeyPressed(GLFW_KEY_LEFT))	tank.center.x -= 0.5f * getTimeStep();
    if (isKeyPressed(GLFW_KEY_RIGHT))	tank.center.x += 0.5f * getTimeStep();
    if (isKeyPressed(GLFW_KEY_UP))		tank.center.y += 0.5f * getTimeStep();
    if (isKeyPressed(GLFW_KEY_DOWN))	tank.center.y -= 0.5f * getTimeStep();

    // rendering
    tank.draw();
}

엄.. 엄청난데... 객체가 tank하나뿐이고 키보드를 방향키만 받아도 저정돈데...

---

명령을 처리하는 객체를 만들어보자.

void update() override
{
    input_handler.handleInput(*this, tank, getTimeStep());

    // rendering
    tank.draw();
}

class InputHandler
{
public:
    Command * button_up = nullptr;

    //std::map<int, Command *> key_command_map;

    InputHandler()
    {
        button_up = new UpCommand;
    }

    void handleInput(Game2D & game, Actor & actor, float dt)
    {
        if (game.isKeyPressed(GLFW_KEY_UP))  button_up->execute(actor, dt);

        /*for (auto & m : key_command_map)
        {
            if (game.isKeyPressed(m.first)) m.second->execute(actor, dt);
        }*/
    }
};

class Command
{
public:
    virtual ~Command() {}
    virtual void execute(Actor& actor, float dt) = 0;
};

class UpCommand : public Command 
{
public:
    virtual void execute(Actor& actor, float dt) override
    {
        actor.moveUp(dt);
    }
};

class Actor
{
public:
    virtual void moveUp(float dt) = 0;
};

class MyTank : public Actor
{
public:
    vec2 center = vec2(0.0f, 0.0f);
    //vec2 direction = vec2(1.0f, 0.0f, 0.0f);

    void moveUp(float dt) override
    {
        center.y += 0.5f * dt;
    }

    void draw()
    {
        beginTransformation();
        {
            translate(center);
            drawFilledBox(Colors::green, 0.25f, 0.1f); // body
            translate(-0.02f, 0.1f);
            drawFilledBox(Colors::blue, 0.15f, 0.09f); // turret
            translate(0.15f, 0.0f);
            drawFilledBox(Colors::red, 0.15f, 0.03f);  // barrel
        }
        endTransformation();
    }
};