Messages

1

General / SFML Book Scene Graph Matrix

« on: August 17, 2013, 11:11:49 pm »

I reading the sfml game developing book, but I am have problems to understand the scene graph   
in connection with the matirx (Transformation).
The problem is, that I dont know a matrix good.
I know only that a matrix is a table with rows and rives, but not anymore.
Where i can learn to understand the matrix from sfml with rotation and transformation and the other matrix stuff that I dont know ?

Sorry if the question is difficult to understand, but I am german.

2

General discussions / SFML Book chapter 2 question

« on: August 01, 2013, 07:07:10 pm »

I read at this moment the sfml development book.
I am at chapter 2 before the headline Error handling.
There stand at the TextureHolder class, two get methods
first:

sf::Texture& get (Textures::ID id);
 

second:

const sf::Texture& get (Textures::ID id) const;
 

But I dont understand the sense of the second method.
The methods do  actually almost the same.

3

General / Re: Elapsed Time is scary

« on: July 19, 2013, 09:45:39 pm »

Ah ok now I have the mistake.
But sometimes i can see a small irregularity.
How can made it better?

Player class:

        sf::CircleShape player;
        sf::Vector2f pos;

        void handleEvent(sf::Event &renderWindowEvent)
        {
        }
        void update(sf::Time &elapsedTime)
        {
                if(sf::Keyboard::isKeyPressed(sf::Keyboard::D))
                {
                        pos.x += 10000 * elapsedTime.asSeconds();
                }
                if(sf::Keyboard::isKeyPressed(sf::Keyboard::A))
                {
                        pos.x -= 10000 * elapsedTime.asSeconds();
                }
                player.setPosition(pos);
        }
        void render(sf::SpriteBatch &spriteBatch)
        {
                spriteBatch.draw(player);
        }
 

Game Loop

sf::Clock elapsedTime;

        while(renderWindow->isOpen())
        {
                sf::Event renderWindowEvent;
                while(renderWindow->pollEvent(renderWindowEvent))
                {
                        handleEvent(renderWindowEvent);
                }

                update(elapsedTime.restart());

                renderWindow->clear(backgroundColor);
                render(*new sf::SpriteBatch(renderWindow));
                renderWindow->display();
        }
 

4

General / Elapsed Time is scary

« on: July 19, 2013, 08:50:07 pm »

Why my player doesent move smooth?

        while(renderWindow->isOpen())
        {
                sf::Clock elapsedTime;

                sf::Event renderWindowEvent;
                while(renderWindow->pollEvent(renderWindowEvent))
                {
                        handleEvent(renderWindowEvent);
                }

                update(elapsedTime.getElapsedTime());

                renderWindow->clear(backgroundColor);
                render(*new sf::SpriteBatch(renderWindow));
                renderWindow->display();
        }
                if(sf::Keyboard::isKeyPressed(sf::Keyboard::D))
                {
                        pos.x += 1000 * elapsedTime.asSeconds();
                }
                if(sf::Keyboard::isKeyPressed(sf::Keyboard::A))
                {
                        pos.x -= 1000 * elapsedTime.asSeconds();
                }
 

I got the most time, if I print the time out as Seconds 3.25-e-005.
Whats that and how I can fix that?
Normal the player should in that case move 1000 pixels per seconds, but he doesent.
Please help.

5

Graphics / SFML best objekt for drawing

« on: July 19, 2013, 02:12:34 pm »

I want to make draw method, for a GameObject, but I dont want to give a pointer to the RenderWindow, because I can in the RenderWindow set for example the size, too.
have SFML a Class with that, I can draw something, or must I made a class myself?

6

General / Re: Architecture from a basic state manager

« on: July 13, 2013, 05:28:14 pm »

Yes with a stack.
Oh I have forgot the push and opo methods, but thats in this case not Important.
I want to knwo the best way, how I State kann change the State of the Statemanager without an pointer to the Statemnager, because I want to protect the update, draw, handleEvent methods from a State(Why should a State run the update Method!?).

7

General / Architecture from a basic state manager

« on: July 13, 2013, 09:59:04 am »

Hi !
My Questions:
Whats the best way, how I can set the state from the state manager in a state?

Give it a better way as my class Graphics to protect the properties from the render window?

And whats your meaning about this?

8

General / SFML Book Topics

« on: July 12, 2013, 11:57:04 pm »

What are the Topics of the new SFML Book?
Is in the Book only explained how I can  draw something, or I can play sounds usw.., or is there explained how to structure a game, too?
Know someone tutorials about the structure from a game?