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require 'rexml/document'
require 'SVG/Graph/Graph'
module SVG
module Graph
# = Synopsis
#
# A superclass for bar-style graphs. Do not attempt to instantiate
# directly; use one of the subclasses instead.
#
# = Author
#
# Sean E. Russell <serATgermaneHYPHENsoftwareDOTcom>
#
# Copyright 2004 Sean E. Russell
# This software is available under the Ruby license[LICENSE.txt]
#
class BarBase < SVG::Graph::Graph
# Ensures that :fields are provided in the configuration.
def initialize config
raise "fields was not supplied or is empty" unless config[:fields] &&
config[:fields].kind_of?(Array) &&
config[:fields].length > 0
super
end
# In addition to the defaults set in Graph::initialize, sets
# [bar_gap] true
# [stack] :overlap
def set_defaults
init_with( :bar_gap => true, :stack => :overlap )
end
# Whether to have a gap between the bars or not, default
# is true, set to false if you don't want gaps.
attr_accessor :bar_gap
# How to stack data sets. :overlap overlaps bars with
# transparent colors, :top stacks bars on top of one another,
# :side stacks the bars side-by-side. Defaults to :overlap.
attr_accessor :stack
protected
def max_value
@data.collect{|x| x[:data].max}.max
end
def min_value
min = 0
if min_scale_value.nil?
min = @data.collect{|x| x[:data].min}.min
min = min > 0 ? 0 : min
else
min = min_scale_value
end
return min
end
def get_css
return <<EOL
/* default fill styles for multiple datasets (probably only use a single dataset on this graph though) */
.key1,.fill1{
fill: #ff0000;
fill-opacity: 0.5;
stroke: none;
stroke-width: 0.5px;
}
.key2,.fill2{
fill: #0000ff;
fill-opacity: 0.5;
stroke: none;
stroke-width: 1px;
}
.key3,.fill3{
fill: #00ff00;
fill-opacity: 0.5;
stroke: none;
stroke-width: 1px;
}
.key4,.fill4{
fill: #ffcc00;
fill-opacity: 0.5;
stroke: none;
stroke-width: 1px;
}
.key5,.fill5{
fill: #00ccff;
fill-opacity: 0.5;
stroke: none;
stroke-width: 1px;
}
.key6,.fill6{
fill: #ff00ff;
fill-opacity: 0.5;
stroke: none;
stroke-width: 1px;
}
.key7,.fill7{
fill: #00ffff;
fill-opacity: 0.5;
stroke: none;
stroke-width: 1px;
}
.key8,.fill8{
fill: #ffff00;
fill-opacity: 0.5;
stroke: none;
stroke-width: 1px;
}
.key9,.fill9{
fill: #cc6666;
fill-opacity: 0.5;
stroke: none;
stroke-width: 1px;
}
.key10,.fill10{
fill: #663399;
fill-opacity: 0.5;
stroke: none;
stroke-width: 1px;
}
.key11,.fill11{
fill: #339900;
fill-opacity: 0.5;
stroke: none;
stroke-width: 1px;
}
.key12,.fill12{
fill: #9966FF;
fill-opacity: 0.5;
stroke: none;
stroke-width: 1px;
}
EOL
end
end
end
end
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