From: Sylvain Petit <sokaos@...>
Date: 2010-02-12T22:29:49+09:00
Subject: [noob] Problem with arrays

Hello,

I have a few issue using arrays.

I'm working with rubySDL to make a vertical shooting game. I have a
ship, which had a collection of "fired_missile".
The level have a collection of critters on screen.

My main loop is :

  def main
    self.init_lvl
    critest = Critters.new(@screen, SCREEN_W,SCREEN_H/2)
    @crit<<critest
    while(@finished == false)
      background = @screen.format.map_rgb(0, 0, 0)
      @screen.fill_rect(0,0,@screen.w,@screen.h,background)
      self.event_poll
      @ship.move
      @ship.draw
      cur_crit = @crit
      cur_crit.each { |c|
      c.move
      c.draw
      self.check_firing(c)
      }
      @screen.update_rect(0,0,@screen.w,@screen.h)
    end
  end

If I understand my code well, for each critters in @crit collection (or
cur_crit to be more accurate), I move the crit, then draw it, and to
finish I call "check_firing" with the critters in parameter.

Here's the check_firing code :

  def check_firing(c)
    critemp = []
    if(@ship.firelist.length!=0)
      @ship.firelist.each { |f|
        if(f.collide_with?(c))
        else
          critemp<<c
        end
        @crit = critemp
      }
    end
  end

The amusing part is that all work well if I fire only one missile. When
I fire more, it becomes unclear : the critters won't disappear, and
(surprisingly) it goes faster.

I used the cur_crit temporary array in the main function because
modifying the @crit array while looping on it was kind of hazardous.

If someone have an idea, it will be greatly appreciated ;)
Thanks.
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