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Gruff::Dot

Graph with dots and labels along a vertical access see: ‘Creating More Effective Graphs’ by Robbins

Public Instance Methods

draw() click to toggle source
    # File lib/gruff/dot.rb, line 9
 9:   def draw
10:     @has_left_labels = true
11:     super
12: 
13:     return unless @has_data
14: 
15:     # Setup spacing.
16:     #
17:     spacing_factor = 1.0
18: 
19:     @items_width = @graph_height / @column_count.to_f
20:     @item_width = @items_width * spacing_factor / @norm_data.size
21:     @d         = @d.stroke_opacity 0.0
22:     height     = Array.new(@column_count, 0)
23:     length     = Array.new(@column_count, @graph_left)
24:     padding    = (@items_width * (1 - spacing_factor)) / 2
25: 
26:     @norm_data.each_with_index do |data_row, row_index|
27:       data_row[DATA_VALUES_INDEX].each_with_index do |data_point, point_index|
28: 
29:         x_pos        = @graph_left + (data_point * @graph_width) - (@item_width.to_f/6.0).round
30:         y_pos        = @graph_top + (@items_width * point_index) + padding + (@item_width.to_f/2.0).round      
31: 
32:         if row_index == 0
33:           @d           = @d.stroke(@marker_color)
34:           @d           = @d.stroke_width 1.0
35:           @d           = @d.opacity 0.1
36:           @d           = @d.line(@graph_left, y_pos, @graph_left + @graph_width, y_pos)
37:         end
38: 
39:         @d           = @d.fill data_row[DATA_COLOR_INDEX]
40:         @d           = @d.stroke('transparent')
41:         @d           = @d.circle(x_pos, y_pos, x_pos + (@item_width.to_f/3.0).round, y_pos)
42: 
43:         # Calculate center based on item_width and current row
44:         label_center = @graph_top + (@items_width * point_index + @items_width / 2) + padding
45:         draw_label(label_center, point_index)
46:       end
47: 
48:     end
49: 
50:     @d.draw(@base_image)
51:   end

Protected Instance Methods

draw_label(y_offset, index) click to toggle source

Draw on the Y axis instead of the X

     # File lib/gruff/dot.rb, line 96
 96:   def draw_label(y_offset, index)
 97:     if !@labels[index].nil? && @labels_seen[index].nil?
 98:       @d.fill             = @font_color
 99:       @d.font             = @font if @font
100:       @d.stroke           = 'transparent'
101:       @d.font_weight      = NormalWeight
102:       @d.pointsize        = scale_fontsize(@marker_font_size)
103:       @d.gravity          = EastGravity
104:       @d                  = @d.annotate_scaled(@base_image,
105:                               1, 1,
106:                               -@graph_left + LABEL_MARGIN * 2.0, y_offset,
107:                               @labels[index], @scale)
108:       @labels_seen[index] = 1
109:     end
110:   end
draw_line_markers() click to toggle source

Instead of base class version, draws vertical background lines and label

    # File lib/gruff/dot.rb, line 56
56:   def draw_line_markers
57: 
58:     return if @hide_line_markers
59: 
60:     @d = @d.stroke_antialias false
61: 
62:     # Draw horizontal line markers and annotate with numbers
63:     @d = @d.stroke(@marker_color)
64:     @d = @d.stroke_width 1
65:     number_of_lines = 5
66: 
67:     # TODO Round maximum marker value to a round number like 100, 0.1, 0.5, etc.
68:     increment = significant(@maximum_value.to_f / number_of_lines)
69:     (0..number_of_lines).each do |index|
70: 
71:       line_diff    = (@graph_right - @graph_left) / number_of_lines
72:       x            = @graph_right - (line_diff * index) - 1
73:       @d           = @d.line(x, @graph_bottom, x, @graph_bottom + 0.5 * LABEL_MARGIN)
74:       diff         = index - number_of_lines
75:       marker_label = diff.abs * increment
76: 
77:       unless @hide_line_numbers
78:         @d.fill      = @font_color
79:         @d.font      = @font if @font
80:         @d.stroke    = 'transparent'
81:         @d.pointsize = scale_fontsize(@marker_font_size)
82:         @d.gravity   = CenterGravity
83:         # TODO Center text over line
84:         @d           = @d.annotate_scaled( @base_image,
85:                           0, 0, # Width of box to draw text in
86:                           x, @graph_bottom + (LABEL_MARGIN * 2.0), # Coordinates of text
87:                           marker_label.to_s, @scale)
88:       end # unless
89:       @d = @d.stroke_antialias true
90:     end
91:   end

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