Class: Gruff::Net

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

Overview

Experimental!!! See also the Spider graph.

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_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

#initialize(*args) ⇒ Net

Returns a new instance of Net.



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# File 'lib/gruff/net.rb', line 14

def initialize(*args)
  super
  
  @hide_dots = false
  @hide_line_numbers = true
end

Instance Attribute Details

#dot_radius ⇒ Object

Returns the value of attribute dot_radius.



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# File 'lib/gruff/net.rb', line 12

def dot_radius
  @dot_radius
end

#hide_dots ⇒ Object

Hide parts of the graph to fit more datapoints, or for a different appearance.



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# File 'lib/gruff/net.rb', line 8

def hide_dots
  @hide_dots
end

#line_width ⇒ Object

Dimensions of lines and dots; calculated based on dataset size if left unspecified



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# File 'lib/gruff/net.rb', line 11

def line_width
  @line_width
end

Instance Method Details

#draw ⇒ Object 



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# File 'lib/gruff/net.rb', line 21

def draw

  super

  return unless @has_data

  @radius = @graph_height / 2.0
  @center_x = @graph_left + (@graph_width / 2.0)
  @center_y = @graph_top + (@graph_height / 2.0) - 10 # Move graph up a bit

  @x_increment = @graph_width / (@column_count - 1).to_f
  circle_radius = dot_radius ||
    clip_value_if_greater_than(@columns / (@norm_data.first[DATA_VALUES_INDEX].size * 2.5), 5.0)

  @d = @d.stroke_opacity 1.0
  @d = @d.stroke_width line_width ||
    clip_value_if_greater_than(@columns / (@norm_data.first[DATA_VALUES_INDEX].size * 4), 5.0)

  if (defined?(@norm_baseline)) then
    level = @graph_top + (@graph_height - @norm_baseline * @graph_height)
    @d = @d.push
    @d.stroke_color @baseline_color
    @d.fill_opacity 0.0
    @d.stroke_dasharray(10, 20)
    @d.stroke_width 5
    @d.line(@graph_left, level, @graph_left + @graph_width, level)
    @d = @d.pop
  end

  @norm_data.each do |data_row|
    prev_x = prev_y = nil
    @d = @d.stroke data_row[DATA_COLOR_INDEX]
    @d = @d.fill data_row[DATA_COLOR_INDEX]

    data_row[DATA_VALUES_INDEX].each_with_index do |data_point, index|
      next if data_point.nil?

      rad_pos = index * Math::PI * 2 / @column_count
      point_distance = data_point * @radius
      start_x = @center_x + Math::sin(rad_pos) * point_distance
      start_y = @center_y - Math::cos(rad_pos) * point_distance

      next_index = index + 1 < data_row[DATA_VALUES_INDEX].length ? index + 1 : 0

      next_rad_pos = next_index * Math::PI * 2 / @column_count
      next_point_distance = data_row[DATA_VALUES_INDEX][next_index] * @radius
      end_x = @center_x + Math::sin(next_rad_pos) * next_point_distance
      end_y = @center_y - Math::cos(next_rad_pos) * next_point_distance

      @d = @d.line(start_x, start_y, end_x, end_y)

      @d = @d.circle(start_x, start_y, start_x - circle_radius, start_y) unless @hide_dots
    end

  end

  @d.draw(@base_image)
end

#draw_line_markers ⇒ Object

the lines connecting in the center, with the first line vertical



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# File 'lib/gruff/net.rb', line 82

def draw_line_markers
  return if @hide_line_markers


  # have to do this here (AGAIN)... see draw() in this class
  # because this funtion is called before the @radius, @center_x and @center_y are set
  @radius = @graph_height / 2.0
  @center_x = @graph_left + (@graph_width / 2.0)
  @center_y = @graph_top + (@graph_height / 2.0) - 10 # Move graph up a bit


  # Draw horizontal line markers and annotate with numbers
  @d = @d.stroke(@marker_color)
  @d = @d.stroke_width 1


  (0..@column_count-1).each do |index|
    rad_pos = index * Math::PI * 2 / @column_count

    @d = @d.line(@center_x, @center_y, @center_x + Math::sin(rad_pos) * @radius, @center_y - Math::cos(rad_pos) * @radius)


    marker_label = labels[index] ? labels[index].to_s : '000'

    draw_label(@center_x, @center_y, rad_pos * 360 / (2 * Math::PI), @radius, marker_label)
  end
end