Class: Gruff::Net

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

Overview

See also the Spider graph.

Here’s how to make a Gruff::Net.

g = Gruff::Net.new
g.title = "Net Graph"
g.labels = {
  0 => '5/6',
  1 => '5/15',
  2 => '5/24',
  3 => '5/30',
  4 => '6/4',
  5 => '6/12',
  6 => '6/21',
  7 => '6/28'
}
g.line_width = 3
g.dot_radius = 4
g.data :Jimmy, [25, 36, 86, 39, 25, 31, 79, 88]
g.data :Julie, [22, 29, 35, 38, 36, 40, 46, 57]
g.write("net.png")

Constant Summary

Constants inherited from Base

Base::DEFAULT_MARGIN, Base::DEFAULT_TARGET_WIDTH, Base::LABEL_MARGIN, Base::LEGEND_MARGIN

Instance Attribute Summary collapse

Attributes inherited from Base

#bold_title, #bottom_margin, #center_labels_over_point, #colors, #font_color, #has_left_labels, #hide_legend, #hide_line_markers, #hide_line_numbers, #hide_title, #label_max_size, #label_stagger_height, #label_truncation_style, #labels, #left_margin, #legend_at_bottom, #legend_box_size, #legend_font_size, #legend_margin, #marker_color, #marker_font_size, #marker_shadow_color, #maximum_value, #minimum_value, #no_data_message, #right_margin, #sort, #sorted_drawing, #title, #title_font, #title_font_size, #title_margin, #top_margin, #use_data_label, #x_axis_increment, #x_axis_label, #y_axis_increment, #y_axis_label

Instance Method Summary collapse

Methods inherited from Base

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

Constructor Details

This class inherits a constructor from Gruff::Base

Instance Attribute Details

#dot_radius=(value) ⇒ Object (writeonly)

Sets the attribute dot_radius

Parameters:

  • value —

    the value to set the attribute dot_radius to.



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# File 'lib/gruff/net.rb', line 31

def dot_radius=(value)
  @dot_radius = value
end

#hide_dots=(value) ⇒ Object (writeonly)

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



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# File 'lib/gruff/net.rb', line 27

def hide_dots=(value)
  @hide_dots = value
end

#line_width=(value) ⇒ Object (writeonly)

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



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# File 'lib/gruff/net.rb', line 30

def line_width=(value)
  @line_width = value
end

Instance Method Details

#draw ⇒ Object 



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# File 'lib/gruff/net.rb', line 44

def draw
  super

  return unless data_given?

  store.norm_data.each do |data_row|
    data_row.points.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.points.length ? index + 1 : 0

      next_rad_pos = next_index * Math::PI * 2 / column_count
      next_point_distance = data_row.points[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

      Gruff::Renderer::Line.new(color: data_row.color, width: @stroke_width).render(start_x, start_y, end_x, end_y)

      unless @hide_dots
        circle_renderer = Gruff::Renderer::Circle.new(color: data_row.color, width: @stroke_width)
        circle_renderer.render(start_x, start_y, start_x - @circle_radius, start_y)
      end
    end
  end
end