Messages

1

Graphics / Strange error when passing a reference to sf::RenderTarget

« on: March 24, 2011, 12:19:34 am »

EDIT: Nevermind! I realized that the objects that I was attempting to call Draw() from (that were stored in a container) were destructed before I managed to draw them. [/b]

2

Graphics / Strange error when passing a reference to sf::RenderTarget

« on: March 23, 2011, 01:39:28 am »

I'm not really sure why I'm getting this error, since I've done this before in other programs. It happens when I attempt to call sf::RenderTarget.Draw(sf::Sprite) - it tells me that I'm attempting to call a pure virtual method.

Code: [Select]

void Draw(sf::RenderTarget& target)
{ target.Draw(sprite_); }

and then in a drawing loop, I'd have

Code: [Select]

// Window declaration
sf::RenderWindow App(/* construction */);

// Drawing loop
for (/* all objects */)
{ iter->Draw(App); }

Is there something wrong with what I'm doing? Or should I try posting more code? Will I be forced to use pointers to make sure the polymorphism kicks in? It's weird, since this has worked before...

3

Graphics / Good way to make sprite sheets? (not really programming)

« on: February 27, 2011, 03:09:46 pm »

I'm wondering if there was a 'best-practice' sort of way to make spritesheets. I'm attempting to make some for myself right now, and I'm pretty bad at it.

4

Graphics / Click and drag sprites?

« on: February 05, 2011, 11:56:36 pm »

Ah, thanks. Comparing against the position instead of the center fixed it.

5

Graphics / Click and drag sprites?

« on: February 02, 2011, 07:22:30 pm »

I'm trying to figure out how I can click on a sprite, then drag it and drop it at a new position. I'm guessing either I shouldn't be using Sprite.SetPosition() like this OR I'm going about calculating a mouseover incorrectly.

Code: [Select]


#include <SFML/Graphics.hpp>

bool isMouseOver(const sf::Sprite& sprite, const sf::Input& input)
{
    const int mousex = input.GetMouseX();
    const int mousey = input.GetMouseY();

    const sf::Vector2f spritesize   = sprite.GetSize();
    const sf::Vector2f spritecenter = sprite.GetCenter();

    // If the distance between the mouse and the sprite's center
    // is less than the length/width of the sprite.
    if (mousex - spritecenter.x < spritesize.x &&
        mousey - spritecenter.y < spritesize.y)
        return true;
    return false;
}


int main()
{
    sf::RenderWindow App(sf::VideoMode(800, 600), "SFML window");


    // Usually I use a resource manager to do this.
    sf::Image Image;
    Image.LoadFromFile("cb.bmp");
    sf::Sprite Sprite;

    Sprite.SetImage(Image);

    while (App.IsOpened())
    {
        const sf::Input& Input = App.GetInput();

        sf::Event Event;
        while (App.GetEvent(Event))
        {
            if (Event.Type == sf::Event::KeyPressed)
            {
                if (Event.Key.Code == sf::Key::Escape)
                    App.Close();
            }

            if (Event.Type == sf::Event::Closed)
                App.Close();
            }
        }

        if (Input.IsMouseButtonDown(sf::Mouse::Left))
            if (isMouseOver(Sprite, Input))
                Sprite.SetPosition(Input.GetMouseX(), Input.GetMouseY());

        App.Clear();

        App.Draw(Sprite);

        App.Display();
    }

    return EXIT_SUCCESS;
}


What happens is that the sprite DOES get dragged around.. but only as long as the mouse is on the sprite's original sprite area. So I'm guessing that I should be modifying something else about the sprite or something, or resetting the center. I've tried that, but I'm not sure how to go about doing it correctly.

6

Audio / Problems opening sound files

« on: January 14, 2011, 12:59:46 am »

Ah, I understood about relative vs absolute filepath. For some reason, I managed to get it working now. It might have had something to do with the files.. chimes.wav started working, but other files within the folder wouldn't. /shrug

Thanks to those who tried to help!

7

Audio / Problems opening sound files

« on: January 12, 2011, 11:39:38 pm »

No idea? :/

8

Audio / Problems opening sound files

« on: January 05, 2011, 02:26:01 am »

I can successfully load and use images, but am having problems doing the same for both sound and music.

Code: [Select]

#include <SFML/Audio.hpp>

int main()
{
    sf::Music Music;
    if (!Music.OpenFromFile("mus/chimes.wav"))
        return EXIT_FAILURE;

    Music.Play();

    return EXIT_SUCCESS;
}


Gives me "Failed to open "mus/chimes.wav" for reading", and does the same with sf::SoundBuffer. I am certain the file path is correct, because I have correctly loaded images along similar filepaths (I also attempted reading an image from the same folder, which worked.)

I don't believe the .wav file is corrupted, since I can still play it, and I have attempted this with several files already.

Any ideas on what's wrong? I'm using Windows 7, gcc 4.4, sfml1.6, code::blocks.[/quote]

9

Audio / Error with OpenAl32.dll

« on: January 05, 2011, 12:25:30 am »

Thank you, Laurent, found them and got it working

10

Audio / Error with OpenAl32.dll

« on: January 04, 2011, 04:31:40 am »

When I attempt to compile, I get this error.

The procedure entry point alGetSource3f could not be located in the dynamic link library OpenAl32.dll.

I'm using Code::Blocks, gcc 4.4, SFML 1.6, on Windows 7. I've linked the libraries as

-lsfml-audio-d
-lsfml-graphics-d
-lsfml-window-d
-lsfml-system-d

My program was working before I attempted to add sound.. so what do I do?

11

General / Problems starting openGL

« on: December 24, 2010, 10:53:31 pm »

Okay, I got it working.. for some reason, changing it to -lsfml-graphics-d, etc fixed it, so I guess it's a problem with the way I set up SFML? I dunno. Thanks, though.

12

General / Problems starting openGL

« on: December 24, 2010, 08:49:15 pm »

I'm trying to get the tutorial for openGL with SFML working (http://www.sfml-dev.org/tutorials/1.6/window-opengl.php), but I'm getting errors like
"undefined reference to `gluPerspective@32'" - I think these are linker errors?

Anyway, I've tried

-lopengl32
-lsfml-graphics-s-d
-lsfml-window-s-d
-lsfml-system-s-d

which gives the 'undefined..' errors, and

-lglu32
-lopengl32
-lsfml-graphics-s-d
-lsfml-window-s-d
-lsfml-system-s-d

which, when I try to compile, gives me an error that ld.exe has stopped working.


I am a total beginner with openGL, so I appreciate any help you can give me.

(I have Windows 7, using GNU GCC with Code::Blocks.)

13

General / Getting around automatic key-pauses?

« on: October 20, 2010, 05:32:37 am »

Oh, awesome! Thanks

14

General / Getting around automatic key-pauses?

« on: October 20, 2010, 04:26:02 am »

Even using sf::Input, I'm getting the key delay. Same with the problem of 2 keypresses - perhaps I'm using it wrong?

(This IS different from first code posted, first code was mixing sf::Event and sf::Input stuff)

Code: [Select]

while (App.IsOpened())
{
    sf::Event Event;

    const sf::Input &Input = App.GetInput();

    if (Game.enemies.empty())
        Game.SpawnEnemies(sf::Randomizer::Random(10,50));

    while (App.GetEvent(Event))
    {
        if (Input.IsKeyDown(sf::Key::Left))
            Game.player->Move("Left");
       
        if (Input.IsKeyDown(sf::Key::Right))
            Game.player->Move("Right");                    
       
        if (Input.IsKeyDown(sf::Key::Space))
            Game.pl_lasers.push_back(Game.player->FireLaser());

        if (Input.IsKeyDown(sf::Key::Escape))
            App.Close();
       
        if (Event.Type == sf::Event::Closed)
            App.Close();
    }
    Game.Update();
    // more stuff....
}


15

General / Getting around automatic key-pauses?

« on: October 20, 2010, 01:47:23 am »

When a key is pressed, if it is held down, it takes a bit for it to continue registering. I'm pretty sure there's a way around this, but I can't figure it out.

Also, how can I handle multiple key inputs at the same time? If say, I'm holding the Right key down, then press space, the Right key is no longer being held down (and I have to press it again).

Code: [Select]

while (App.IsOpened())
        {
            sf::Event Event;

            const sf::Input &Input = App.GetInput();

            while (App.GetEvent(Event))
            {
                if (Event.Type == sf::Event::Closed)
                    App.Close();
                if (Input.IsKeyDown(sf::Key::Left))
                    Game.player->Move("Left");
                else if (Input.IsKeyDown(sf::Key::Right))
                    Game.player->Move("Right");

                if (Event.Type == sf::Event::KeyPressed)
                {
                    if (Event.Key.Code == sf::Key::Escape)
                        App.Close();
                    else if (Event.Key.Code == sf::Key::Space)
                        Game.pl_lasers.push_back(Game.player->FireLaser());
                }
            }

About the Input.IsKeyDown() being mixed up with the Event.Type checking, I think I remember reading something about Input being better for some reason.. tbh, I don't remember why I used it.

Thanks for help!