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
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
|
require 'rexml/document'
require 'SVG/Graph/Graph'
require 'SVG/Graph/BarBase'
module SVG
module Graph
# === Create presentation quality SVG bar graphs easily
#
# = Synopsis
#
# require 'SVG/Graph/Bar'
#
# fields = %w(Jan Feb Mar);
# data_sales_02 = [12, 45, 21]
#
# graph = SVG::Graph::Bar.new(
# :height => 500,
# :width => 300,
# :fields => fields
# )
#
# graph.add_data(
# :data => data_sales_02,
# :title => 'Sales 2002'
# )
#
# print "Content-type: image/svg+xml\r\n\r\n"
# print graph.burn
#
# = Description
#
# This object aims to allow you to easily create high quality
# SVG[http://www.w3c.org/tr/svg bar graphs. You can either use the default
# style sheet or supply your own. Either way there are many options which
# can be configured to give you control over how the graph is generated -
# with or without a key, data elements at each point, title, subtitle etc.
#
# = Notes
#
# The default stylesheet handles upto 12 data sets, if you
# use more you must create your own stylesheet and add the
# additional settings for the extra data sets. You will know
# if you go over 12 data sets as they will have no style and
# be in black.
#
# = Examples
#
# * http://germane-software.com/repositories/public/SVG/test/test.rb
#
# = See also
#
# * SVG::Graph::Graph
# * SVG::Graph::BarHorizontal
# * SVG::Graph::Line
# * SVG::Graph::Pie
# * SVG::Graph::Plot
# * SVG::Graph::TimeSeries
class Bar < BarBase
include REXML
# See Graph::initialize and BarBase::set_defaults
def set_defaults
super
self.top_align = self.top_font = 1
end
protected
def get_x_labels
@config[:fields]
end
def get_y_labels
maxvalue = max_value
minvalue = min_value
range = maxvalue - minvalue
top_pad = range == 0 ? 10 : range / 20.0
scale_range = (maxvalue + top_pad) - minvalue
scale_division = scale_divisions || (scale_range / 10.0)
if scale_integers
scale_division = scale_division < 1 ? 1 : scale_division.round
end
rv = []
maxvalue = maxvalue%scale_division == 0 ?
maxvalue : maxvalue + scale_division
minvalue.step( maxvalue, scale_division ) {|v| rv << v}
return rv
end
def x_label_offset( width )
width / 2.0
end
def draw_data
minvalue = min_value
fieldwidth = field_width
unit_size = (@graph_height.to_f - font_size*2*top_font) /
(get_y_labels.max - get_y_labels.min)
bargap = bar_gap ? (fieldwidth < 10 ? fieldwidth / 2 : 10) : 0
bar_width = fieldwidth - bargap
bar_width /= @data.length if stack == :side
x_mod = (@graph_width-bargap)/2 - (stack==:side ? bar_width/2 : 0)
bottom = @graph_height
field_count = 0
@config[:fields].each_index { |i|
dataset_count = 0
for dataset in @data
# cases (assume 0 = +ve):
# value min length
# +ve +ve value - min
# +ve -ve value - 0
# -ve -ve value.abs - 0
value = dataset[:data][i]
left = (fieldwidth * field_count)
length = (value.abs - (minvalue > 0 ? minvalue : 0)) * unit_size
# top is 0 if value is negative
top = bottom - (((value < 0 ? 0 : value) - minvalue) * unit_size)
left += bar_width * dataset_count if stack == :side
@graph.add_element( "rect", {
"x" => left.to_s,
"y" => top.to_s,
"width" => bar_width.to_s,
"height" => length.to_s,
"class" => "fill#{dataset_count+1}"
})
make_datapoint_text(left + bar_width/2.0, top - 6, value.to_s)
dataset_count += 1
end
field_count += 1
}
end
end
end
end
|
