Class Gruff::Net
In: lib/gruff/net.rb
Parent: Gruff::Base
StackedMixin StackedBar SideStackedBar StackedArea AccumulatorBar Base Scene Pie Area PhotoBar Bullet Spider SideBar Net Bar Dot Line Pie Observable Group SideBar StandardError IncorrectNumberOfDatasetsException Magick Bar Layer BarConversion lib/gruff/stacked_area.rb lib/gruff/scene.rb lib/gruff/spider.rb lib/gruff/pie.rb lib/gruff/bullet.rb lib/gruff/area.rb lib/gruff/net.rb lib/gruff/bar_conversion.rb lib/gruff/side_bar.rb lib/gruff/bar.rb lib/gruff/line.rb lib/gruff/stacked_bar.rb lib/gruff/dot.rb lib/gruff/side_stacked_bar.rb lib/gruff/photo_bar.rb lib/gruff/base.rb lib/gruff/accumulator_bar.rb lib/gruff/mini/bar.rb lib/gruff/mini/side_bar.rb lib/gruff/mini/pie.rb Legend Mini Deprecated Gruff dot/m_17_0.png

Experimental!!! See also the Spider graph.

Methods

draw   draw_label   draw_line_markers   new  

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)

[Source]

    # File lib/gruff/net.rb, line 14
14:   def initialize(*args)
15:     super
16:     
17:     @hide_dots = false
18:     @hide_line_numbers = true
19:   end

Public Instance methods

draw()

[Source]

    # File lib/gruff/net.rb, line 21
21:   def draw
22: 
23:     super
24: 
25:     return unless @has_data
26: 
27:     @radius = @graph_height / 2.0
28:     @center_x = @graph_left + (@graph_width / 2.0)
29:     @center_y = @graph_top + (@graph_height / 2.0) - 10 # Move graph up a bit
30: 
31:     @x_increment = @graph_width / (@column_count - 1).to_f
32:     circle_radius = dot_radius ||
33:       clip_value_if_greater_than(@columns / (@norm_data.first[DATA_VALUES_INDEX].size * 2.5), 5.0)
34: 
35:     @d = @d.stroke_opacity 1.0
36:     @d = @d.stroke_width line_width ||
37:       clip_value_if_greater_than(@columns / (@norm_data.first[DATA_VALUES_INDEX].size * 4), 5.0)
38: 
39:     if (defined?(@norm_baseline)) then
40:       level = @graph_top + (@graph_height - @norm_baseline * @graph_height)
41:       @d = @d.push
42:       @d.stroke_color @baseline_color
43:       @d.fill_opacity 0.0
44:       @d.stroke_dasharray(10, 20)
45:       @d.stroke_width 5
46:       @d.line(@graph_left, level, @graph_left + @graph_width, level)
47:       @d = @d.pop
48:     end
49: 
50:     @norm_data.each do |data_row|
51:       prev_x = prev_y = nil
52:       @d = @d.stroke data_row[DATA_COLOR_INDEX]
53:       @d = @d.fill data_row[DATA_COLOR_INDEX]
54: 
55:       data_row[DATA_VALUES_INDEX].each_with_index do |data_point, index|
56:         next if data_point.nil?
57: 
58:         rad_pos = index * Math::PI * 2 / @column_count
59:         point_distance = data_point * @radius
60:         start_x = @center_x + Math::sin(rad_pos) * point_distance
61:         start_y = @center_y - Math::cos(rad_pos) * point_distance
62: 
63:         next_index = index + 1 < data_row[DATA_VALUES_INDEX].length ? index + 1 : 0
64: 
65:         next_rad_pos = next_index * Math::PI * 2 / @column_count
66:         next_point_distance = data_row[DATA_VALUES_INDEX][next_index] * @radius
67:         end_x = @center_x + Math::sin(next_rad_pos) * next_point_distance
68:         end_y = @center_y - Math::cos(next_rad_pos) * next_point_distance
69: 
70:         @d = @d.line(start_x, start_y, end_x, end_y)
71: 
72:         @d = @d.circle(start_x, start_y, start_x - circle_radius, start_y) unless @hide_dots
73:       end
74: 
75:     end
76: 
77:     @d.draw(@base_image)
78:   end
draw_line_markers()

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

[Source]

     # File lib/gruff/net.rb, line 82
 82:   def draw_line_markers
 83:     return if @hide_line_markers
 84: 
 85: 
 86:     # have to do this here (AGAIN)... see draw() in this class
 87:     # because this funtion is called before the @radius, @center_x and @center_y are set
 88:     @radius = @graph_height / 2.0
 89:     @center_x = @graph_left + (@graph_width / 2.0)
 90:     @center_y = @graph_top + (@graph_height / 2.0) - 10 # Move graph up a bit
 91: 
 92: 
 93:     # Draw horizontal line markers and annotate with numbers
 94:     @d = @d.stroke(@marker_color)
 95:     @d = @d.stroke_width 1
 96: 
 97: 
 98:     (0..@column_count-1).each do |index|
 99:       rad_pos = index * Math::PI * 2 / @column_count
100: 
101:       @d = @d.line(@center_x, @center_y, @center_x + Math::sin(rad_pos) * @radius, @center_y - Math::cos(rad_pos) * @radius)
102: 
103: 
104:       marker_label = labels[index] ? labels[index].to_s : '000'
105: 
106:       draw_label(@center_x, @center_y, rad_pos * 360 / (2 * Math::PI), @radius, marker_label)
107:     end
108:   end

Private Instance methods

draw_label(center_x, center_y, angle, radius, amount)

[Source]

     # File lib/gruff/net.rb, line 112
112:   def draw_label(center_x, center_y, angle, radius, amount)
113:     r_offset = 1.1
114:     x_offset = center_x # + 15 # The label points need to be tweaked slightly
115:     y_offset = center_y # + 0  # This one doesn't though
116:     x = x_offset + (radius * r_offset * Math.sin(angle.deg2rad))
117:     y = y_offset - (radius * r_offset * Math.cos(angle.deg2rad))
118: 
119:     # Draw label
120:     @d.fill = @marker_color
121:     @d.font = @font if @font
122:     @d.pointsize = scale_fontsize(20)
123:     @d.stroke = 'transparent'
124:     @d.font_weight = BoldWeight
125:     @d.gravity = CenterGravity
126:     @d.annotate_scaled(@base_image, 0, 0, x, y, amount, @scale)
127:   end

[Validate]