multi-dimension array problem in RGSS (RPG Maker XP)

Question

This is my first day code script in RMXP. I read tutorials, ruby references, etc and I found myself stuck on a weird problem, here is the scenario:

I made a custom script to display layered images
Create the class, create an instance variable to hold the array, create a simple method to add an element into it, done
The draw method (skipped the rest of the code to this part):

  def draw
    image = []
    index = 0
    for i in [email protected]
      if image.size > 0
        index = image.size
      end
      image[index] = Sprite.new
      image[index].bitmap = RPG::Cache.picture(@components[i][0] + '.png')
      image[index].x = @x + @components[i][1]
      image[index].y = @y + @components[i][2]
      image[index].z = @z + @components[i][3]
      @test =+ 1
    end
  end

Create an event that does these script

> $layerz = Layerz.new $layerz.configuration[0] = ['root',0,0,1]
> $layerz.configuration[1] = ['bark',0,10,2] 
> $layerz.configuration[2] = ['branch',0,30,3]
> $layerz.configuration[3] = ['leaves',0,60,4] $layerz.draw

Run, trigger the event and the result :

ERROR! Undefined method`[]' for nil:NilClass pointing at this line on draw method :

image[index].bitmap = RPG::Cache.picture(@components[i][0] + '.png')

THEN, I changed the method like these just for testing:

def draw
    image = []
    index = 0
    for i in [email protected]
      if image.size > 0
        index = image.size
      end
      image[index] = Sprite.new
      image[index].bitmap = RPG::Cache.picture(@components[0][0] + '.png')
      image[index].x = @x + @components[0][1]
      image[index].y = @y + @components[0][2]
      image[index].z = @z + @components[0][3]
      @test =+ 1
    end

I changed the @components[i][0] to @components[0][0] and IT WORKS, but only the root as it not iterates to the next array index

Im stuck here, see :

> in single level array, @components[0] and @components[i] has no problem
> in multi-dimension array, @components[0][0] has no problem BUT
> in multi-dimension array, @components[i][0] produce the error as above
> mentioned.

any suggestion to fix the error ? Or did I wrote something wrong ?

XP is old. It was old in 2003. Consider upgrading to a newer RPG Maker. — ashes999
– ashes999, Commented Jun 16, 2012 at 2:14
@Byte56 : For the last resort, I'll try hash or vector, so this is confirmed as array limitation in ruby ? — AzDesign
– AzDesign, Commented Jun 16, 2012 at 4:41
@ashes999, yes it is old, but I need XP for its styles (VX and VXAce has chibi-character style, I dont like it) And most custom script available in forum dedicated to XP — AzDesign
– AzDesign, Commented Jun 16, 2012 at 4:43
I'm not sure about "confirmed" but the nested hash does seem easier. — House
– House, Commented Jun 16, 2012 at 4:44

AzDesign · Accepted Answer · 2012-06-23 08:03:17Z

Ok, after doing some reading, understanding ruby, I found the solution without changing the data type to hash/vector

  def draw
    image = []
    index = 0
    @components.each { |arr|
      if image.size > 0
        index = image.size
      end
      image[index] = Sprite.new
      image[index].bitmap = RPG::Cache.picture(arr[0] + '.png')
      image[index].x = @x + arr[1]
      image[index].y = @y + arr[2]
      image[index].z = @z + arr[3]
      @test =+ 1
    }
  end

each function is really convenient, I just learned that. Thanks the feedback guys.

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