CODE:

#include 
#include 

class PlayerModel {
public:
	PlayerModel() : x_(0), y_(0) {}
	int x() const { return x_; }
	int y() const { return y_; }
	void setX(int x) { x_ = x; }
	void setY(int y) { y_ = y; }

private:
	int x_, y_;
};

typedef std::shared_ptr PlayerModelPtr;

class PlayerView {
public:
	PlayerView(const PlayerModelPtr& model) : model_(model) {}
	
	void draw() {
		DrawBox(model_->x(), model_->y(), model_->x() + 32, model_->y() + 32, GetColor(255, 255, 255), TRUE);
	}

private:
	PlayerModelPtr model_;
};

class MouseController {
public:
	MouseController(const PlayerModelPtr& model) : model_(model) {}
	
	void update() {
		int x, y;
		GetMousePoint(&x, &y);
		model_->setX(x);
		model_->setY(y);
	}

private:
	PlayerModelPtr model_;
};

int WINAPI WinMain( HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow )
{
	ChangeWindowMode(TRUE);
	SetDrawScreen(DX_SCREEN_BACK);
	DxLib_Init();

	PlayerModelPtr player = std::make_shared();
	MouseController controller(player);
	PlayerView view(player);

	while (ProcessMessage() == 0 && ScreenFlip() == 0 && ClearDrawScreen() == 0) {
		controller.update();
		view.draw();
	}
	
	return DxLib_End();
}