Class: Gruff::Bullet

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

Overview

en.wikipedia.org/wiki/Bullet_graph

Constant Summary

Constants inherited from Base

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

Instance Attribute Summary

Attributes inherited from Base

#additional_line_values, #bold_title, #bottom_margin, #center_labels_over_point, #colors, #font, #font_color, #has_left_labels, #hide_legend, #hide_line_markers, #hide_line_numbers, #hide_title, #label_formatting, #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_count, #marker_font_size, #marker_shadow_color, #maximum_value, #minimum_value, #no_data_message, #right_margin, #show_labels_for_bar_values, #sort, #sorted_drawing, #stacked, #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, #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(target_width = "400x40") ⇒ Bullet

Returns a new instance of Bullet.



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

def initialize(target_width="400x40")
  if not Numeric === target_width
    geometric_width, geometric_height = target_width.split('x')
    @columns = geometric_width.to_f
    @rows = geometric_height.to_f
  else
    @columns = target_width.to_f
    @rows = target_width.to_f / 5.0
  end

  initialize_ivars

  reset_themes
  self.theme = Gruff::Themes::GREYSCALE
  @title_font_size = 20
end

Instance Method Details

#data(value, maximum_value, options = {}) ⇒ Object 



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# File 'lib/gruff/bullet.rb', line 24

def data(value, maximum_value, options={})
  @value = value.to_f
  @maximum_value = maximum_value.to_f
  @options = options
  @options.map { |k, v| @options[k] = v.to_f if v === Numeric }
end

#draw ⇒ Object

def setup_drawing

# Maybe should be done in one of the following functions for more granularity.
unless @has_data
  draw_no_data()
  return
end

normalize()
setup_graph_measurements()
sort_norm_data() if @sort # Sort norm_data with avg largest values set first (for display)

draw_legend()
draw_line_markers()
draw_axis_labels()
draw_title

end



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# File 'lib/gruff/bullet.rb', line 48

def draw
  # TODO Left label
  # TODO Bottom labels and markers
  # @graph_bottom
  # Calculations are off 800x???

  @colors.reverse!

  draw_title

  @margin       = 30.0
  @thickness    = @raw_rows / 6.0
  @right_margin = @margin
  @graph_left   = (@title && (@title_width * 1.3)) || @margin
  @graph_width  = @raw_columns - @graph_left - @right_margin
  @graph_height = @thickness * 3.0

  # Background
  @d = @d.fill @colors[0]
  @d = @d.rectangle(@graph_left, 0, @graph_left + @graph_width, @graph_height)

  [:high, :low].each_with_index do |indicator, index|
    next unless @options.has_key?(indicator)
    @d = @d.fill @colors[index + 1]
    indicator_width_x  = @graph_left + @graph_width * (@options[indicator] / @maximum_value)
    @d = @d.rectangle(@graph_left, 0, indicator_width_x, @graph_height)
  end

  if @options.has_key?(:target)
    @d = @d.fill @font_color
    target_x = @graph_left + @graph_width * (@options[:target] / @maximum_value)
    half_thickness = @thickness / 2.0
    @d = @d.rectangle(target_x, half_thickness, target_x + half_thickness, @thickness * 2 + half_thickness)
  end

  # Value
  @d = @d.fill @font_color
  @d = @d.rectangle(@graph_left, @thickness, @graph_left + @graph_width * (@value / @maximum_value), @thickness * 2)

  @d.draw(@base_image)
end

#draw_title ⇒ Object 



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# File 'lib/gruff/bullet.rb', line 90

def draw_title
  return unless @title

  @font_height = calculate_caps_height(scale_fontsize(@title_font_size))
  @title_width = calculate_width(@title_font_size, @title)

  @d.fill        = @font_color
  @d.font        = @font if @font
  @d.stroke('transparent')
  @d.font_weight = NormalWeight
  @d.pointsize   = scale_fontsize(@title_font_size)
  @d.gravity     = NorthWestGravity
  @d             = @d.annotate_scaled(*[
    @base_image,
    1.0, 1.0,
    @font_height/2, @font_height/2,
    @title,
    @scale
  ])
end