+++ /dev/null
-
-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
projects / selectricity-live / blobdiff