c++ - View 类未收到更新的模型类数据

模型类

class spaceshipModel {
private:
Vector2f position;
float speed, acceleration, energy, fuel;

public:
//Contructor
spaceshipModel() : position(0, 0), speed(0), acceleration(0), energy(0), fuel(0) {}

//Destructor
~spaceshipModel() {}

//Sets
void setPosition(float _x, float _y) { position.x = _x; position.y = _y; }

void setSpeed(float _speed) { speed = _speed; }

void setAcceleration(float _acceleration) { acceleration = _acceleration; }

void setEnergy(float _energy) { energy = _energy; }

void setFuel(float _fuel) { fuel = _fuel; }

//Gets
Vector2f getPosition() { return position; }

float getSpeed() { return speed; }

float getAcceleration() { return acceleration; }

float getEnergy() { return energy; }

float getFuel() { return fuel; }

};

查看类(class)

class spaceshipView {
private:
 Texture* image;
 Sprite sprite;
 spaceshipModel model;

public:
 //Constructor
 spaceshipView() : image(0) {}

 //Destructor
 ~spaceshipView() {}

//Setting the image
void setImage(Texture* _image) { image = _image; }

//Drawing the image
void drawImage(RenderWindow* _window) {
    sprite.setTexture(*image);
    sprite.setPosition(model.getPosition());
    sprite.setScale(Vector2f(0.2f, 0.2f));
    _window->draw(sprite);
    _window->display();
}
};

主要

剩下了很多代码，但是我在main中称呼它:

int main() {

//Call instance of the Spaceship model
spaceshipModel shipModel;

//Call instance of the Spaceship view
spaceshipView shipView;

//Create the texture of the spaceship from file
Texture spaceship;
spaceship.loadFromFile("spaceship.png");

//Create the window
RenderWindow window(VideoMode(800, 600), "Spaceship with MVC");

//Run the program as long as the window is open
while (window.isOpen()) {

    //Check all the window's events that were triggered since the last iteration of the loop
    Event event;

    while (window.pollEvent(event)) {

        //"Close requested" event: we close the window
        switch (event.type) {

        //Window closed by pressing the X
        case Event::Closed:
            window.close();
            break;

        //Checking for key pressed event
        case Event::KeyPressed:

            //Pressing esc to close the window
            if (event.key.code == Keyboard::Escape) {
                window.close();
            }
            break;

        //We don't process other types of events
        default:
            break;
        }

        //Clear screen with white BG
        window.clear(Color::White);

        //TESTING THE SETTING OF THE POSITION
        std::cout << shipModel.getPosition().x << ", " << shipModel.getPosition().y << std::endl;
        shipModel.setPosition(100, 100);
        std::cout << shipModel.getPosition().x << ", " << shipModel.getPosition().y << std::endl;

        //Set and draw the image
        shipView.setImage(&spaceship);
        shipView.drawImage(&window);

    }
}

return 0;

}

spaceship 完美绘制，但仅设置为(0，0)。如上图所示，即使将位置设置为(100，100)。图像停留在(0，0)。由于我正在使用View类中Model类的getPosition函数，因此即使cout测试确实显示了更改，我也不认为数据正在正确更新。

我究竟做错了什么？有人可以给我一些指示吗？

最佳答案

在上面的代码段中，shipModel和main()中的shipView.model对象是两个不同的对象。您可以使用shipView中的setter来让spaceshipView知道模型，也可以直接调用shipView.model的方法。