Messages

1

Graphics / Re: Deleting Sprites in a vector!?STUCK

« on: January 29, 2014, 07:56:40 pm »

Thanks Azaral I finally got it working using your index method. Sprite and texture are no longer pointers. I guess the iterator method is just not for me.

 for (unsigned int i = 0; i < SpriteVector.size(); i++)
        {
            if (SpriteVector[i].getPosition().y <= 600)
        {
        SpriteVector[i].move(5, 5);
        }
        }

        //RENDERING
        window.clear();
        for (unsigned int i = 0; i < SpriteVector.size(); i++)
        {
        if (SpriteVector[i].getPosition().y <= 600)
        {
         window.draw(SpriteVector[i]);
        }
        else if (SpriteVector[i].getPosition().y >= 601)
        {
         SpriteVector.erase(SpriteVector.begin() + i); //this succesfully removes the object from the vector
         std::cout << "Container size..." << SpriteVector.size() << "\n";
        }
        }

 

Thanks again Azaral

2

Graphics / Re: Deleting Sprites in a vector!?STUCK

« on: January 29, 2014, 06:46:08 pm »

Ive tired clear() and I get the same error. Do I need to stop iterating through the vector before I can call clear/erase/ or delete?

3

Graphics / Re: Deleting Sprites in a vector!?STUCK

« on: January 29, 2014, 06:31:26 pm »

Thanks for the reply! Having a container with objects already in it and only adding to the container if all the objects are being used is the way to go here, smh I never thought of that!

I was using pointers just to try to implement the code a different way to see if it worked but your right they are not needed here.

Now, let say I want to reset these vectors to their original size once a new level starts, what would be the correct way so that I do not get a BAD_ACCESS error? What way do you use to delete items in a vector?

4

Graphics / Deleting Sprites in a vector!?STUCK

« on: January 29, 2014, 05:28:16 pm »

Hello SFML community,

I'm using SFML 2.1 with xcode 5 on my macbook air and I am somewhat new to SFML & C++(I have a couple of months under my belt).  I am in need of some help when it comes to Sprites & memory management (EXAMPLE: removing bullets when they go off screen, etc). I am creating a platform game and I have been stuck for weeks trying to figure this out. I have looked on a good amount of forums regarding this issue and I've come across examples where erase(it) being used inside of a for loop using an iterator. I've tried this but it does not work for me.

I would like to know how to clear out a vector that contains Sprites (or class objects w/ Sprites) using an iterator. And I would like these Sprites to be cleared out based on a boolean value. Which ever way I try to implement this I get an BAD_ACCESS error or the program crashes after the Sprite or object is removed from the vector using erase(). I have tried ever way I can think of but nothing works.

Instead of posting my game which contains hundreds of lines of code I wrote a simpler code, please examine it and help me understand what I am doing wrong.

#include <SFML/Graphics.hpp>
//#include "ResourcePath.hpp"
#include <iostream>
#include <vector>





int main()
{

    bool is_Alive;
    is_Alive = true;
    sf::Sprite* Sprite;
    Sprite = new sf::Sprite;

    std::vector<sf::Sprite> SpriteVector;
    typedef std::vector<sf::Sprite>::iterator iter;

    //loading projectile image
    sf::Texture* projectileImage;
    projectileImage = new sf::Texture;
    projectileImage->loadFromFile("fireball.png");

    Sprite->setTexture(*projectileImage);


    //Creating game window
    sf::RenderWindow window(sf::VideoMode(800, 600), "SFML Game");

    //set famerate to 60 FPS
    window.setFramerateLimit(60);

    window.setKeyRepeatEnabled(false);

    sf::Event event;

    float moveSpeed = 0;

    //variable that keeps game loop running
    bool play = true;
    //Game Loop
    while (play == true)
    {

        //Events

        while (window.pollEvent(event))
        {

            if (event.type == sf::Event::KeyPressed && event.key.code == sf::Keyboard::Space)
            {
                SpriteVector.push_back(*Sprite);
            }




            if (event.type == sf::Event::Closed)
           {

           }


       }

        //LOGIC-----------------------------------------------------------------------------------------------------

        std::cout << "SpriteVector is..." << SpriteVector.size() << "\n";

        for (iter it = SpriteVector.begin(); it != SpriteVector.end(); it++)
        {
            if ((it)->getPosition().y <= 600)
        {
        (it)->move(5, 5);
        }
        }

        //RENDERING
        window.clear();
        for (iter it = SpriteVector.begin(); it != SpriteVector.end(); it++)
        {
        if ((it)->getPosition().y <= 600)
        {
         window.draw(*it);
        }
        if ((it)->getPosition().y >= 601)
        {
         SpriteVector.erase(it);
         std::cout << "Erasing..." << (&it) << "Container size..." << SpriteVector.size() << "\n";
        }
        }
        window.display();
    }

    //Clean Up
    window.close();
    return 0;
}