Class: TechnicalGraph

Inherits:
Object
  • Object
show all
Defined in:
lib/technical_graph.rb

Overview

options parameters: :width - width of image :height - height of image :x_min, :x_max, :y_min, :y_max - default or fixed ranges :xy_behaviour:

  • :default - use them as default ranges

  • :fixed - ranges will not be changed during addition of layers

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(options = { }) ⇒ TechnicalGraph

Returns a new instance of TechnicalGraph.



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# File 'lib/technical_graph.rb', line 23

def initialize(options = { })
  @options = options

  @log_device = options[:log_device] || STDOUT
  @logger = Logger.new(@log_device)
  @logger.level = options[:log_level] || Logger::INFO

  @data_processor = GraphDataProcessor.new(self)
  @image_drawer = GraphImageDrawer.new(self)
  @axis = GraphAxis.new(self)
  @layers = Array.new
end

Instance Attribute Details

#axis ⇒ Object (readonly)

Returns the value of attribute axis.



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# File 'lib/technical_graph.rb', line 36

def axis
  @axis
end

#data_processor ⇒ Object (readonly)

Returns the value of attribute data_processor.



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# File 'lib/technical_graph.rb', line 36

def data_processor
  @data_processor
end

#image_drawer ⇒ Object (readonly)

Returns the value of attribute image_drawer.



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# File 'lib/technical_graph.rb', line 36

def image_drawer
  @image_drawer
end

#layers ⇒ Object (readonly)

Returns the value of attribute layers.



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# File 'lib/technical_graph.rb', line 36

def layers
  @layers
end

#logger ⇒ Object (readonly)

Returns the value of attribute logger.



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# File 'lib/technical_graph.rb', line 36

def logger
  @logger
end

#options ⇒ Object (readonly)

Returns the value of attribute options.



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# File 'lib/technical_graph.rb', line 36

def options
  @options
end

Instance Method Details

#add_layer(data = [], options = { }) ⇒ Object

Add new data layer to layer array



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# File 'lib/technical_graph.rb', line 49

def add_layer(data = [], options = { })
  t = Time.now
  @layers << DataLayer.new(data, options, self)
  logger.debug "layer added, size #{data.size}"
  logger.debug " TIME COST #{Time.now - t}"
end

#best_output_format ⇒ Object

Best output image format, used for testing



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# File 'lib/technical_graph.rb', line 39

def best_output_format
  if options[:drawer_class] == :rasem
    return 'svg'
  end
  if options[:drawer_class] == :rmagick
    return 'png'
  end
end

#pre_render(ext) ⇒ Object

You don’t have to run this



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# File 'lib/technical_graph.rb', line 90

def pre_render(ext)
  case ext
    when 'svg', 'svgz' then
      @options[:drawer_class] = :rasem
      render

    when 'png' then
      if gem_available?('rmagick')
        # rmagick is at the moment the best solution
        @options[:drawer_class] = :rmagick
      else
        @options[:drawer_class] = :chunky_png
      end
      render

    when 'jpeg', 'jpg', 'bmp', 'gif' then
      if rmagick_installed?
        @options[:drawer_class] = :rmagick
        render
      else
        raise Gem::LoadError
      end

    else
      raise ArgumentError

  end
end

#render ⇒ Object

Create graph



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# File 'lib/technical_graph.rb', line 57

def render
  @layers.each do |l|
    @data_processor.process_data_layer(l)
  end

  # recalculate ranges if needed
  @image = @image_drawer.crate_blank_graph_image

  # draw axis
  @axis.render_on_image(@image)
  # draw layers
  @layers.each do |l|
    # drawing
    @image_drawer.render_data_layer(l)
  end
  # draw legend
  @image_drawer.render_data_legend
end

#save_to_file(filename) ⇒ Object

Render and save graph to a file



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# File 'lib/technical_graph.rb', line 77

def save_to_file(filename)
  ext = File.extname(filename).gsub(/^\./, '')
  pre_render(ext)
  @image_drawer.save_to_file(filename)
end

#to_format(ext) ⇒ Object

Render and return graph string



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# File 'lib/technical_graph.rb', line 84

def to_format(ext)
  pre_render(ext)
  @image_drawer.to_format(ext)
end