1
2
3
4
5
6
7
8
9
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
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
|
require File.dirname(__FILE__) + '/base'
# Experimental!!! See also the Net graph.
#
# Submitted by Kevin Clark http://glu.ttono.us/
class Gruff::Spider < Gruff::Base
# Hide all text
attr_reader :hide_text
attr_accessor :hide_axes
attr_reader :transparent_background
attr_accessor :rotation
def transparent_background=(value)
@transparent_background = value
@base_image = render_transparent_background if value
end
def hide_text=(value)
@hide_title = @hide_text = value
end
def initialize(max_value, target_width = 800)
super(target_width)
@max_value = max_value
@hide_legend = true;
@rotation = 0
end
def draw
@hide_line_markers = true
super
return unless @has_data
# Setup basic positioning
diameter = @graph_height
radius = @graph_height / 2.0
top_x = @graph_left + (@graph_width - diameter) / 2.0
center_x = @graph_left + (@graph_width / 2.0)
center_y = @graph_top + (@graph_height / 2.0) - 25 # Move graph up a bit
@unit_length = radius / @max_value
total_sum = sums_for_spider
prev_degrees = 0.0
additive_angle = (2 * Math::PI)/ @data.size
current_angle = rotation * Math::PI / 180.0
# Draw axes
draw_axes(center_x, center_y, radius, additive_angle) unless hide_axes
# Draw polygon
draw_polygon(center_x, center_y, additive_angle)
@d.draw(@base_image)
end
private
def normalize_points(value)
value * @unit_length
end
def draw_label(center_x, center_y, angle, radius, amount)
r_offset = 50 # The distance out from the center of the pie to get point
x_offset = center_x # 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.cos(angle))
y = y_offset + ((radius + r_offset) * Math.sin(angle))
# Draw label
@d.fill = @marker_color
@d.font = @font if @font
@d.pointsize = scale_fontsize(legend_font_size)
@d.stroke = 'transparent'
@d.font_weight = BoldWeight
@d.gravity = CenterGravity
@d.annotate_scaled( @base_image,
0, 0,
x, y,
amount, @scale)
end
def draw_axes(center_x, center_y, radius, additive_angle, line_color = nil)
return if hide_axes
current_angle = rotation * Math::PI / 180.0
@data.each do |data_row|
@d.stroke(line_color || data_row[DATA_COLOR_INDEX])
@d.stroke_width 5.0
x_offset = radius * Math.cos(current_angle)
y_offset = radius * Math.sin(current_angle)
@d.line(center_x, center_y,
center_x + x_offset,
center_y + y_offset)
draw_label(center_x, center_y, current_angle, radius, data_row[DATA_LABEL_INDEX].to_s) unless hide_text
current_angle += additive_angle
end
end
def draw_polygon(center_x, center_y, additive_angle, color = nil)
points = []
current_angle = rotation * Math::PI / 180.0
@data.each do |data_row|
points << center_x + normalize_points(data_row[DATA_VALUES_INDEX].first) * Math.cos(current_angle)
points << center_y + normalize_points(data_row[DATA_VALUES_INDEX].first) * Math.sin(current_angle)
current_angle += additive_angle
end
@d.stroke_width 1.0
@d.stroke(color || @marker_color)
@d.fill(color || @marker_color)
@d.fill_opacity 0.4
@d.polygon(*points)
end
def sums_for_spider
@data.inject(0.0) {|sum, data_row| sum += data_row[DATA_VALUES_INDEX].first}
end
end
|
