X-Git-Url: https://projects.mako.cc/source/selectricity/blobdiff_plain/1a62f78f4f3818ab697bddf51f80a1ba150ce9e7..131cab23209cb1dfa81930240b8cf722d2302131:/lib/gruff-0.2.8/lib/gruff/scene.rb

diff --git a/lib/gruff-0.2.8/lib/gruff/scene.rb b/lib/gruff-0.2.8/lib/gruff/scene.rb
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+
+require "observer"
+require File.dirname(__FILE__) + '/base'
+
+##
+# A scene is a non-linear graph that assembles layers together to tell a story.
+# Layers are folders with appropriately named files (see below). You can group 
+# layers and control them together or just set their values individually.
+#
+# Examples:
+#
+# * A city scene that changes with the time of day and the weather conditions.
+# * A traffic map that shows red lines on streets that are crowded and green on free-flowing ones.
+#
+# Usage:
+# 
+#  g = Gruff::Scene.new("500x100", "artwork/city_scene")
+#  g.layers = %w(background haze sky clouds)
+#  g.weather_group = %w(clouds)
+#  g.time_group = %w(background sky)
+#  g.weather = "cloudy"
+#  g.time = Time.now
+#  g.haze = true
+#  g.write "hazy_daytime_city_scene.png"
+#
+#
+#
+# If there is a file named 'default.png', it will be selected (unless other values are provided to override it).
+#
+class Gruff::Scene < Gruff::Base
+    
+  # An array listing the foldernames that will be rendered, from back to front.
+  #
+  #  g.layers = %w(sky clouds buildings street people)
+  #
+  attr_reader :layers
+
+  def initialize(target_width, base_dir)
+    @base_dir = base_dir
+    @groups = {}
+    @layers = []    
+    super target_width
+  end
+
+  def draw
+    # Join all the custom paths and filter out the empty ones
+    image_paths = @layers.map { |layer| layer.path }.select { |path| !path.empty? }
+    images = Magick::ImageList.new(*image_paths)
+    @base_image = images.flatten_images
+  end
+
+  def layers=(ordered_list)
+    ordered_list.each do |layer_name|
+      @layers << Gruff::Layer.new(@base_dir, layer_name)
+    end
+  end
+
+  # Group layers to input values
+  #
+  #  g.weather_group = ["sky", "sea", "clouds"]
+  #
+  # Set input values
+  #
+  #  g.weather = "cloudy"
+  #
+  def method_missing(method_name, *args)
+    case method_name.to_s
+    when /^(\w+)_group=$/
+      add_group $1, *args
+      return
+    when /^(\w+)=$/
+      set_input $1, args.first
+      return
+    end
+    super
+  end
+
+private
+
+  def add_group(input_name, layer_names)
+    @groups[input_name] = Gruff::Group.new(input_name, @layers.select { |layer| layer_names.include?(layer.name) })
+  end
+
+  def set_input(input_name, input_value)
+    if not @groups[input_name].nil?
+      @groups[input_name].send_updates(input_value)
+    else
+      if chosen_layer = @layers.detect { |layer| layer.name == input_name }
+        chosen_layer.update input_value
+      end
+    end
+  end
+  
+end
+
+
+class Gruff::Group
+
+  include Observable
+  attr_reader :name
+
+  def initialize(folder_name, layers)
+    @name = folder_name
+    layers.each do |layer|
+      layer.observe self
+    end
+  end
+  
+  def send_updates(value)
+    changed
+    notify_observers value
+  end
+  
+end
+
+
+class Gruff::Layer
+  
+  attr_reader :name
+  
+  def initialize(base_dir, folder_name)
+    @base_dir = base_dir.to_s
+    @name = folder_name.to_s
+    @filenames = Dir.open(File.join(base_dir, folder_name)).entries.select { |file| file =~ /^[^.]+\.png$/ }
+    @selected_filename = select_default
+  end
+  
+  # Register this layer so it receives updates from the group
+  def observe(obj)
+    obj.add_observer self
+  end
+  
+  # Choose the appropriate filename for this layer, based on the input
+  def update(value)
+    @selected_filename =  case value.to_s
+                          when /^(true|false)$/
+                            select_boolean value
+                          when /^(\w|\s)+$/
+                            select_string value
+                          when /^-?(\d+\.)?\d+$/
+                            select_numeric value
+                          when /(\d\d):(\d\d):\d\d/
+                            select_time "#{$1}#{$2}"
+                          else
+                            select_default
+                          end
+    # Finally, try to use 'default' if we're still blank
+    @selected_filename ||= select_default
+  end
+
+  # Returns the full path to the selected image, or a blank string
+  def path
+    unless @selected_filename.nil? || @selected_filename.empty?
+      return File.join(@base_dir, @name, @selected_filename)
+    end
+    ''
+  end
+
+private
+
+  # Match "true.png" or "false.png"
+  def select_boolean(value)
+    file_exists_or_blank value.to_s
+  end
+
+  # Match -5 to _5.png
+  def select_numeric(value)
+    file_exists_or_blank value.to_s.gsub('-', '_')
+  end
+  
+  def select_time(value)
+    times = @filenames.map { |filename| filename.gsub('.png', '') }
+    times.each_with_index do |time, index|
+      if (time > value) && (index > 0)
+        return "#{times[index - 1]}.png"
+      end
+    end
+    return "#{times.last}.png"
+  end
+  
+  # Match "partly cloudy" to "partly_cloudy.png"
+  def select_string(value)
+    file_exists_or_blank value.to_s.gsub(' ', '_')
+  end
+  
+  def select_default
+    @filenames.include?("default.png") ? "default.png" : ''
+  end
+
+  # Returns the string "#{filename}.png", if it exists.
+  #
+  # Failing that, it returns default.png, or '' if that doesn't exist.
+  def file_exists_or_blank(filename)
+    @filenames.include?("#{filename}.png") ? "#{filename}.png" : select_default
+  end
+  
+end