1 require 'rexml/document'
2 require 'SVG/Graph/Graph'
3
4 module SVG
5 module Graph
6 # = Synopsis
7 #
8 # A superclass for bar-style graphs. Do not attempt to instantiate
9 # directly; use one of the subclasses instead.
10 #
11 # = Author
12 #
13 # Sean E. Russell <serATgermaneHYPHENsoftwareDOTcom>
14 #
15 # Copyright 2004 Sean E. Russell
16 # This software is available under the Ruby license[LICENSE.txt]
17 #
18 class BarBase < SVG::Graph::Graph
19 # Ensures that :fields are provided in the configuration.
20 def initialize config
21 raise "fields was not supplied or is empty" unless config[:fields] &&
22 config[:fields].kind_of?(Array) &&
23 config[:fields].length > 0
24 super
25 end
26
27 # In addition to the defaults set in Graph::initialize, sets
28 # [bar_gap] true
29 # [stack] :overlap
30 def set_defaults
31 init_with( :bar_gap => true, :stack => :overlap )
32 end
33
34 # Whether to have a gap between the bars or not, default
35 # is true, set to false if you don't want gaps.
36 attr_accessor :bar_gap
37 # How to stack data sets. :overlap overlaps bars with
38 # transparent colors, :top stacks bars on top of one another,
39 # :side stacks the bars side-by-side. Defaults to :overlap.
40 attr_accessor :stack
41
42
43 protected
44
45 def max_value
46 @data.collect{|x| x[:data].max}.max
47 end
48
49 def min_value
50 min = 0
51 if min_scale_value.nil?
52 min = @data.collect{|x| x[:data].min}.min
53 min = min > 0 ? 0 : min
54 else
55 min = min_scale_value
56 end
57 return min
58 end
59
60 def get_css
61 return <<EOL
62 /* default fill styles for multiple datasets (probably only use a single dataset on this graph though) */
63 .key1,.fill1{
64 fill: #ff0000;
65 fill-opacity: 0.5;
66 stroke: none;
67 stroke-width: 0.5px;
68 }
69 .key2,.fill2{
70 fill: #0000ff;
71 fill-opacity: 0.5;
72 stroke: none;
73 stroke-width: 1px;
74 }
75 .key3,.fill3{
76 fill: #00ff00;
77 fill-opacity: 0.5;
78 stroke: none;
79 stroke-width: 1px;
80 }
81 .key4,.fill4{
82 fill: #ffcc00;
83 fill-opacity: 0.5;
84 stroke: none;
85 stroke-width: 1px;
86 }
87 .key5,.fill5{
88 fill: #00ccff;
89 fill-opacity: 0.5;
90 stroke: none;
91 stroke-width: 1px;
92 }
93 .key6,.fill6{
94 fill: #ff00ff;
95 fill-opacity: 0.5;
96 stroke: none;
97 stroke-width: 1px;
98 }
99 .key7,.fill7{
100 fill: #00ffff;
101 fill-opacity: 0.5;
102 stroke: none;
103 stroke-width: 1px;
104 }
105 .key8,.fill8{
106 fill: #ffff00;
107 fill-opacity: 0.5;
108 stroke: none;
109 stroke-width: 1px;
110 }
111 .key9,.fill9{
112 fill: #cc6666;
113 fill-opacity: 0.5;
114 stroke: none;
115 stroke-width: 1px;
116 }
117 .key10,.fill10{
118 fill: #663399;
119 fill-opacity: 0.5;
120 stroke: none;
121 stroke-width: 1px;
122 }
123 .key11,.fill11{
124 fill: #339900;
125 fill-opacity: 0.5;
126 stroke: none;
127 stroke-width: 1px;
128 }
129 .key12,.fill12{
130 fill: #9966FF;
131 fill-opacity: 0.5;
132 stroke: none;
133 stroke-width: 1px;
134 }
135 EOL
136 end
137 end
138 end
139 end
