Rework output API

Now you give the data at the creation of the object to render it
later.
So you need to create a new output object for every new set of data.

lib/rubella/map.rb

@@ -52,8 +52,7 @@ module Rubella
     # @return binaryblob An output representation of the heatmap
     def process inpt
       weight = @weighting.new 10
-      outpt    = @output.new
-      outpt.create weight.parse(inpt)
+      @output.new(weight.parse(inpt)).render
     end
 
     # Set the input type by the given name

lib/rubella/output/ascii.rb

@@ -23,10 +23,11 @@ module Rubella
       # Also sets the used ascii art theme to "shades_ascii". See the
       # used_symbols= for further information.
       #
+      # @param data Rubella::Storage
       # @param field_size int Used chars for one value
       # @return Rubella::Output::ASCII
       #
-      def initialize field_size = 1
+      def initialize data, field_size = 1
         @symbols = Hash.new
         @symbols["shades"]       = 
                   [" ", " ", "░", "░", "▒", "▒", "▓", "▓", "█", "█"]
@@ -38,7 +39,7 @@ module Rubella
                   [" ", "1", "2", "3", "4", "5", "6", "7", "8", "9"]
 
         self.used_symbols = "shades_ascii"
-        super field_size
+        super data, field_size
       end
 
       # Sets the used ascii theme by the given name.
@@ -61,14 +62,13 @@ module Rubella
           @symbols.keys.join(", ")
       end
 
-      # Creates an ascii art representation of the given storage data.
+      # Creates an ascii art representation.
       #
-      # @param storage Rubella::Storage
-      # @return Rubella::Storage::ASCII
+      # @return String
       #
-      def create storage
-        buckets = storage.data[0].length
-        # columns = storage.data.length
+      def render
+        buckets = @data.data[0].length
+        # columns = @data.data.length
 
         # image size
         # x = columns*@field_size
@@ -78,7 +78,7 @@ module Rubella
         ascii_arr = [] 
         0.upto(buckets-1).each { |i| ascii_arr[i] = "" }
 
-        storage.data.each do |point|
+        @data.data.each do |point|
           i = 0
           point.reverse.each do |part|
             part = (part*10).to_i       
@@ -94,8 +94,7 @@ module Rubella
           end
         end
 
-        @data = ascii_arr.join("\n")
-        self
+        ascii_arr.join("\n")
       end
     end
 

lib/rubella/output/base.rb

@@ -8,28 +8,27 @@ module Rubella
     #
     class Base
       attr_accessor :field_size
-      attr_reader   :data
 
       # Constructor
       # Gets the field size to store it local. It's the size of one value of
       # the later created visual representation. The unit depends on the kind
       # of representation.
       #
+      # @param data Rubella::Storage
       # @param field_size int size of one value
       # @return Rubella::Output::Base
       #
-      def initialize field_size
+      def initialize data, field_size
+        @data       = data
         @field_size = field_size
       end
 
-      # Creates a visual representation of the data in the given storage and
-      # stores this local.
+      # Creates a visual representation.
       #
-      # @param storage Rubella::Storage
-      # @return Rubella::Output::Base
+      # @return rendered data
       #
-      def create storage
-        raise NotImplementedError "Please override 'create' in your concrete "+
+      def render
+        raise NotImplementedError "Please override 'render' in your concrete "+
           "implementation"
       end
     end

lib/rubella/output/image.rb

@@ -15,31 +15,31 @@ module Rubella
       # Constructor
       # Has a default field_size of 15 pixel.
       #
+      # @param data Rubella::Storage
       # @param field_size int How many pixel one value has
       # @return Rubella::Output::Image
       #
-      def initialize field_size = 15
-        super field_size
+      def initialize data, field_size = 15
+        super data, field_size
       end
 
-      # Creates a pixel based graphic from the given storage data.
+      # Creates a pixel based graphic.
       #
-      # @param storage Rubella::Storage
-      # @return Rubella::Output::Image
+      # @return RMagick::Image
       #
-      def create storage
-        buckets = storage.data[0].length
-        columns = storage.data.length
+      def render
+        buckets = @data.data[0].length
+        columns = @data.data.length
 
         # image size
         x = columns*@field_size
         y = buckets*@field_size
 
         # start drawing the damn thing
-        @data = Magick::Image.new(x, y) { self.background_color = "white" }
+        image = Magick::Image.new(x, y) { self.background_color = "white" }
 
         i = 0
-        storage.data.each do |point|
+        @data.data.each do |point|
           j = 0
           point.reverse.each do |part|
             # draw a red rectangle on the white background
@@ -55,13 +55,13 @@ module Rubella
             # Draw
             core.fill(Magick::Pixel.from_hsla(0, 255, l, 1).to_color)
             core.rectangle((i*@field_size), (j*@field_size), ((i+1)*@field_size), ((j+1)*@field_size))
-            core.draw @data
+            core.draw image
             j = j + 1
           end
           i = i + 1
         end
 
-        self
+        image
       end