Class: Gruff::Dot

Inherits:
Base
  • Object
show all
Defined in:
lib/gruff/dot.rb

Overview

Graph with dots and labels along a vertical access see: ‘Creating More Effective Graphs’ by Robbins

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

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 Method Details

#draw ⇒ Object 



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

def draw
  @has_left_labels = true
  super

  return unless @has_data

  # Setup spacing.
  #
  spacing_factor = 1.0

  @items_width = @graph_height / @column_count.to_f
  @item_width = @items_width * spacing_factor / @norm_data.size
  @d         = @d.stroke_opacity 0.0
  height     = Array.new(@column_count, 0)
  length     = Array.new(@column_count, @graph_left)
  padding    = (@items_width * (1 - spacing_factor)) / 2

  @norm_data.each_with_index do |data_row, row_index|
    data_row[DATA_VALUES_INDEX].each_with_index do |data_point, point_index|

      x_pos        = @graph_left + (data_point * @graph_width) - (@item_width.to_f/6.0).round
      y_pos        = @graph_top + (@items_width * point_index) + padding + (@item_width.to_f/2.0).round      

      if row_index == 0
        @d           = @d.stroke(@marker_color)
        @d           = @d.stroke_width 1.0
        @d           = @d.opacity 0.1
        @d           = @d.line(@graph_left, y_pos, @graph_left + @graph_width, y_pos)
      end

      @d           = @d.fill data_row[DATA_COLOR_INDEX]
      @d           = @d.stroke('transparent')
      @d           = @d.circle(x_pos, y_pos, x_pos + (@item_width.to_f/3.0).round, y_pos)

      # Calculate center based on item_width and current row
      label_center = @graph_top + (@items_width * point_index + @items_width / 2) + padding
      draw_label(label_center, point_index)
    end

  end

  @d.draw(@base_image)
end