Class: Gruff::StackedArea

Inherits:
Base
  • Object
show all
Includes:
StackedMixin
Defined in:
lib/gruff/stacked_area.rb

Constant Summary

Constants inherited from Base

Base::DATA_COLOR_INDEX, Base::DATA_LABEL_INDEX, Base::DATA_VALUES_INDEX, Base::DEBUG, Base::DEFAULT_MARGIN, Base::DEFAULT_TARGET_WIDTH, Base::LABEL_MARGIN, Base::LEGEND_MARGIN, Base::THOUSAND_SEPARATOR

Instance Attribute Summary collapse

Attributes inherited from Base

#additional_line_values, #bottom_margin, #center_labels_over_point, #colors, #font, #font_color, #has_left_labels, #hide_legend, #hide_line_markers, #hide_line_numbers, #hide_title, #labels, #left_margin, #legend_box_size, #legend_font_size, #legend_margin, #marker_color, #marker_count, #marker_font_size, #maximum_value, #minimum_value, #no_data_message, #right_margin, #sort, #stacked, #title, #title_font_size, #title_margin, #top_margin, #x_axis_label, #y_axis_increment, #y_axis_label

Instance Method Summary collapse

Methods inherited from Base

#add_color, #data, #initialize, #initialize_ivars, #margins=, #replace_colors, #theme=, #theme_37signals, #theme_greyscale, #theme_keynote, #theme_odeo, #theme_pastel, #theme_rails_keynote, #to_blob, #write

Methods included from Deprecated

#graph_height, #graph_left, #graph_top, #graph_width, #scale_measurements, #total_height

Constructor Details

This class inherits a constructor from Gruff::Base

Instance Attribute Details

#last_series_goes_on_bottom ⇒ Object

Returns the value of attribute last_series_goes_on_bottom.



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# File 'lib/gruff/stacked_area.rb', line 7

def last_series_goes_on_bottom
  @last_series_goes_on_bottom
end

Instance Method Details

#draw ⇒ Object 



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# File 'lib/gruff/stacked_area.rb', line 9

def draw
  get_maximum_by_stack
  super

  return unless @has_data

  @x_increment = @graph_width / (@column_count - 1).to_f
  @d = @d.stroke 'transparent'

  height = Array.new(@column_count, 0)

  data_points = nil
  iterator = last_series_goes_on_bottom ? :reverse_each : :each
  @norm_data.send(iterator) do |data_row|
    prev_data_points = data_points
    data_points = Array.new
      
    @d = @d.fill data_row[DATA_COLOR_INDEX]

    data_row[DATA_VALUES_INDEX].each_with_index do |data_point, index|
      # Use incremented x and scaled y
      new_x = @graph_left + (@x_increment * index)
      new_y = @graph_top + (@graph_height - data_point * @graph_height - height[index])

      height[index] += (data_point * @graph_height)
      
      data_points << new_x
      data_points << new_y
        
      draw_label(new_x, index)

    end

    if prev_data_points
      poly_points = data_points.dup
      (prev_data_points.length/2 - 1).downto(0) do |i|
        poly_points << prev_data_points[2*i] 
        poly_points << prev_data_points[2*i+1]
      end
      poly_points << data_points[0] 
      poly_points << data_points[1] 
    else
      poly_points = data_points.dup
      poly_points << @graph_right
      poly_points << @graph_bottom - 1
      poly_points << @graph_left
      poly_points << @graph_bottom - 1
      poly_points << data_points[0] 
      poly_points << data_points[1] 
    end
    @d = @d.polyline(*poly_points)

  end

  @d.draw(@base_image)
end