Topics

1

Graphics / How to rotate sprite, keeping the original position?

« on: June 26, 2014, 11:45:08 pm »

How to rotate sprite, keeping the original position? Sprite position changes every time. It goes to ~ 300 degrees.

Sprite* square;
....
square->SetRotation((float)rand()%360);
 

2

System / How to create a thread(with args) from the method?

« on: March 27, 2014, 12:42:29 am »

Hi!

How to create a thread(with args) from the method?

class A
{
public:
    A()
    {
         // understood that does not work
         pThread = new sf::Thread(std::bind(&Method, 15, 25), this));
    }
    ~A()
    {
         delete pThread;
    }
    void Method(int a, int b);

    private:
        sf::Thread* pThread;
};
 

3

Network / How read recive data? (const void*)

« on: March 26, 2014, 07:10:57 pm »

Hello! I need to read the incoming packets.

I can not make it through sf::Packet, since the structure of the package is not known.
I need to convert the received packet data(const void*) to "classical" set bits in hex ​​format. (example: 00:00:00:04:00:00:00:0c:68:65:6c:6c:6f:20:73:65:72:76:65:72)

ps: by TcpSocket

4

Graphics / How to create a copy of the class?

« on: January 12, 2014, 06:35:49 am »

Greetings!
I want to make a base class Depictable for graphics that will hold my methods.
It inherits from sf :: Drawable.

class Depictable: public sf::Drawable
{
            ...
    public:
            virtual ~Depictable() {}

    private:
            void draw(sf::RenderTarget& target, sf::RenderStates states) const {}
            ...
};
 

I want to do is an exact copy of the class sf :: RectangleShape.

class Rectangle : public Depictable,  public sf::RectangleShape
{
    public:
                virtual ~Rectangle() {}
                explicit Rectangle(const sf::Vector2f& size = sf::Vector2f(0, 0)) { setSize(size); }
};
 

and then draw it.

        Rectangle* line = new Rectangle(sf::Vector2f(50, 10));
        line->setFillColor(sf::Color::White);
        line->setPosition(100, 100);
        app.draw(*line);
 

Naturally, the line is drawn.
How to make a class so that it is drawn?
except sf::RectangleShape* line = new Rectangle(sf::Vector2f(50, 10));

5

General / Question about destructors of some classes.

« on: May 18, 2013, 01:23:03 pm »

Good day.
I have a question.
Why destructors some classes:
sf::~TcpSocket, sf::~Thread
do not call methods:
sf::TcpSocke::disconnect(),  sf::Thread::terminate()
?
When using them appear some discomfort, for example:

sf::Thread* thread= new sf::Thread(&fooo);
thread.launch();
...
delete thread;

The thread is still active, you have to manually call thread->terminate().

ps: And yet, it would be nice to add the processing status for threads. (sf::Thread::Status)

6

System / SFML in the future.

« on: December 19, 2012, 08:10:50 pm »

Will there be any in the library of methods for process management and implementation of the singleton pattern?


Sorry for my English.

7

System / multithreading and srand

« on: December 07, 2012, 01:58:46 pm »

Hi. 
How to use a randomizer with multithreading?
simple ex:

class Myc
{
public:
        Myc()
        {
        }

        ~Myc()
        {
                for (int i = 0; i < threads.size(); ++i)
                        if(sf::Thread* thr = threads[i])
                        {
                                thr->terminate();
                                delete thr;
                        }
                threads.clear();
        }

        void Start()
        {
                // 3 thread
                for (int i = 0; i < 3; ++i)
                        threads.push_back(new sf::Thread(&Myc::ThrFun, this));

                for (int i = 0; i < threads.size(); ++i)
                        threads[i]->launch();
        }

        void ThrFun()
        {
                sf::Clock clock;

                while (true)
                {
                        if (clock.getElapsedTime().asSeconds() >= 3)
                        {
                                // problem
                                int r = rand()%100+1;
                                std::cout << r << std::endl;

                                clock.restart();
                        }
                }
        }

private:
        std::vector<sf::Thread*> threads;
};

int main()
{
        srand((unsigned)time(NULL));

        Myc m;
        m.Start();

        std::cin.get();
}
 

result:
The same value in each thread. Since the mutex does not work, or I did not use true.

8

Graphics / Divide the image into parts for animation.

« on: October 03, 2012, 03:16:49 pm »

Hello! How to divide the image to animate?
Give an example, please.

img example source: