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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