Array help

Comments

• PaulH Member

  June 2014 edited June 2014 Accepted Answer

  You're on the right track. You would just need to do the same steps (setScale, setPosition, addChild, etc) with water2 as you do with water1.
  
  One of the benefits of Lua and Gideros is that you don't really need to have a variable for every bitmap in the scene, like water1, water2, etc. You can just create a new one and add it to the stage. You may find it's helpful to create a new class, maybed called WaterBullet, that uses the Bitmap base class, and it wouldn't hurt to use the same texture to create the bitmap for each, just to save memory. You might try something like this, and call it WaterBullet.lua:
  
  -------------------------------------
  WaterBullet = Core.class(Sprite)
  
  function WaterBullet:init(texture)
  self.bitmap = Bitmap.new(texture)
  self:addChild(self.bitmap)
  self:addEventListener(Event.ENTER_FRAME, self.onEnterFrame, self)
  end -- of init()
  
  function WaterBullet:onEnterFrame()
  -- Do all the stuff you want to do every frame for your bullet, like
  -- move it, detect if it hit the fire, etc.
  -- If the bullet has left the screen or hit something and you want to
  -- get rid of it,
  if (???) then -- however you want to detect the bullet hitting
  -- something or timing out, etc.
  self:remove() -- Take the bullet off the stage, etc.
  end -- of if it's time to remove this bullet
  end -- of onEnterFrame()
  
  function WaterBullet:remove()
  -- Note that we have one fewer active bullets now:
  number_of_active_bullets = number_of_active_bullets - 1
  
  -- take this bullet off the stage so we don't see it after this:
  stage:removeChild(self)
  collectgarbage() -- so the system can free up the memory for a bullet that's
  -- no longer on the stage, and to keep bullets that are no longer part of the
  -- scene from hitting things, etc.
  end -- of function remove()
  -------------------------------------
  
  
  In your main module you would add new bullets something like this, possibly in a function called "shoot" just to keep things organized:
  
  function shoot()
  if number_of_active_bullets == nil then
  number_of_active_bullets = 0
  end -- of if we haven't set number of bullets yet
  
  -- Note: just change the 2 below to allow more bullets at once
  if number_of_active_bullets < 2 then
  -- Keep track of how many bullets are on the stage:
  number_of_active_bullets = number_of_active_bullets + 1
  
  -- Get the texture for the water bullet if we haven't already:
  if water_texture == nil then
  water_texture = Texture.new("Water.png")
  end -- of if we don't have the water texture yet
  
  -- Make a new bullet using the existing texture:
  local new_bullet = WaterBullet.new(water_texture)
  new_bullet:setPosition(???) -- plug in the position of your hose
  new_bullet:setScale(???) -- whatever scale you like
  
  -- Set your speed, alpha and anything else you want for the new bullet here.
  
  stage:addChild(new_bullet)
  end -- of if we are allowed another bullet
  end -- of shoot()
  
  Hope that helps,
  
  Paul
  

  Likes: Harrison, iWatts

  +1 -1 (+2 / -0 )Share on Facebook