class ImageParadise::Gruff::Net

Experimental!!! See also the Spider graph.

Attributes

dot_radius[RW]
hide_dots[RW]

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

line_width[RW]

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

Public Class Methods

new(*args) click to toggle source

initialize

Calls superclass method ImageParadise::Gruff::Base::new
# File lib/image_paradise/graphs/net.rb, line 20
def initialize(*args)
  super
  @hide_dots = false
  @hide_line_numbers = true
  @sorted_drawing = true
end

Public Instance Methods

draw() click to toggle source

draw

Calls superclass method ImageParadise::Gruff::Base#draw
# File lib/image_paradise/graphs/net.rb, line 27
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)
    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|
    @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() click to toggle source

draw_line_markers

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

# File lib/image_paradise/graphs/net.rb, line 86
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

Private Instance Methods

draw_label(center_x, center_y, angle, radius, amount) click to toggle source

draw_label

# File lib/image_paradise/graphs/net.rb, line 116
def draw_label(center_x, center_y, angle, radius, amount)
  r_offset = 1.1
  x_offset = center_x # + 15 # The label points need to be tweaked slightly
  y_offset = center_y # + 0  # This one doesn't though
  x = x_offset + (radius * r_offset * Math.sin(deg2rad(angle)))
  y = y_offset - (radius * r_offset * Math.cos(deg2rad(angle)))

  # Draw label
  @d.fill = @marker_color
  @d.font = @font if @font
  @d.pointsize = scale_fontsize(20)
  @d.stroke = 'transparent'
  @d.font_weight = BoldWeight
  @d.gravity = CenterGravity
  @d.annotate_scaled(@base_image, 0, 0, x, y, amount, @scale)
end