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require 'rexml/document'
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require 'SVG/Graph/BarBase'
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module SVG
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module Graph
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# === Create presentation quality SVG horitonzal bar graphs easily
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#
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# = Synopsis
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#
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# require 'SVG/Graph/BarHorizontal'
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#
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# fields = %w(Jan Feb Mar)
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# data_sales_02 = [12, 45, 21]
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#
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# graph = SVG::Graph::BarHorizontal.new({
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# :height => 500,
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# :width => 300,
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# :fields => fields,
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# })
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#
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# graph.add_data({
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# :data => data_sales_02,
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# :title => 'Sales 2002',
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# })
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#
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# print "Content-type: image/svg+xml\r\n\r\n"
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# print graph.burn
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#
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# = Description
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#
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# This object aims to allow you to easily create high quality
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# SVG horitonzal bar graphs. You can either use the default style sheet
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# or supply your own. Either way there are many options which can
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# be configured to give you control over how the graph is
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# generated - with or without a key, data elements at each point,
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# title, subtitle etc.
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#
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# = Examples
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#
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# * http://germane-software.com/repositories/public/SVG/test/test.rb
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#
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# = See also
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#
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# * SVG::Graph::Graph
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# * SVG::Graph::Bar
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# * SVG::Graph::Line
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# * SVG::Graph::Pie
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# * SVG::Graph::Plot
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# * SVG::Graph::TimeSeries
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#
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# == Author
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#
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# Sean E. Russell <serATgermaneHYPHENsoftwareDOTcom>
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#
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# Copyright 2004 Sean E. Russell
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# This software is available under the Ruby license[LICENSE.txt]
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#
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class BarHorizontal < BarBase
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# In addition to the defaults set in BarBase::set_defaults, sets
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# [rotate_y_labels] true
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# [show_x_guidelines] true
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# [show_y_guidelines] false
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def set_defaults
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super
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init_with(
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:rotate_y_labels => true,
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:show_x_guidelines => true,
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:show_y_guidelines => false
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)
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self.right_align = self.right_font = 1
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end
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protected
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def get_x_labels
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maxvalue = max_value
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minvalue = min_value
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range = maxvalue - minvalue
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top_pad = range == 0 ? 10 : range / 20.0
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scale_range = (maxvalue + top_pad) - minvalue
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scale_division = scale_divisions || (scale_range / 10.0)
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if scale_integers
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scale_division = scale_division < 1 ? 1 : scale_division.round
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end
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rv = []
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maxvalue = maxvalue%scale_division == 0 ?
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maxvalue : maxvalue + scale_division
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minvalue.step( maxvalue, scale_division ) {|v| rv << v}
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return rv
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end
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def get_y_labels
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@config[:fields]
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end
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def y_label_offset( height )
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height / -2.0
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end
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def draw_data
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minvalue = min_value
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fieldheight = field_height
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unit_size = (@graph_width.to_f - font_size*2*right_font ) /
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(get_x_labels.max - get_x_labels.min )
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bargap = bar_gap ? (fieldheight < 10 ? fieldheight / 2 : 10) : 0
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bar_height = fieldheight - bargap
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bar_height /= @data.length if stack == :side
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y_mod = (bar_height / 2) + (font_size / 2)
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field_count = 1
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@config[:fields].each_index { |i|
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dataset_count = 0
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for dataset in @data
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value = dataset[:data][i]
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top = @graph_height - (fieldheight * field_count)
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top += (bar_height * dataset_count) if stack == :side
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# cases (assume 0 = +ve):
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# value min length left
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# +ve +ve value.abs - min minvalue.abs
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# +ve -ve value.abs - 0 minvalue.abs
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# -ve -ve value.abs - 0 minvalue.abs + value
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length = (value.abs - (minvalue > 0 ? minvalue : 0)) * unit_size
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left = (minvalue.abs + (value < 0 ? value : 0)) * unit_size
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@graph.add_element( "rect", {
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"x" => left.to_s,
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"y" => top.to_s,
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"width" => length.to_s,
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"height" => bar_height.to_s,
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"class" => "fill#{dataset_count+1}"
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})
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make_datapoint_text(
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left+length+5, top+y_mod, value, "text-anchor: start; "
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)
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dataset_count += 1
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end
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field_count += 1
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}
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end
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end
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end
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end
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