Class: Gruffy::Area

Inherits:
Base
  • Object
show all
Defined in:
lib/gruffy/area.rb

Constant Summary

Constants inherited from Base

Base::DATA_COLOR_INDEX, Base::DATA_LABEL_INDEX, Base::DATA_VALUES_INDEX, Base::DATA_VALUES_X_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, #background_label_height, #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_rotation, #label_stagger_height, #label_truncation_style, #label_y_axis, #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, #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 ⇒ Area

Returns a new instance of Area.



5
6
7
8
 
# File 'lib/gruffy/area.rb', line 5

def initialize(*)
  super
  @sorted_drawing = true
end

Instance Method Details

#draw ⇒ Object 



10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
 
# File 'lib/gruffy/area.rb', line 10

def draw
  super

  return unless @has_data

  @x_increment = @graph_width / (@column_count - 1).to_f
  @d = @d.stroke 'transparent'

  @norm_data.each do |data_row|
    poly_points = Array.new
    prev_x = prev_y = 0.0
    @d = @d.fill data_row[DATA_COLOR_INDEX]

    data_row[DATA_VALUES_INDEX].each_with_index do |data_point, index|
      # Use incremented x and scaled y
      new_x = @graph_left + (@x_increment * index)
      new_y = @graph_top + (@graph_height - data_point * @graph_height)

      poly_points << new_x
      poly_points << new_y

      draw_label(new_x, index)

      prev_x = new_x
      prev_y = new_y
    end

    # Add closing points, draw polygon
    poly_points << @graph_right
    poly_points << @graph_bottom - 1
    poly_points << @graph_left
    poly_points << @graph_bottom - 1

    @d = @d.polyline(*poly_points)

  end

  @d.draw(@base_image)
end