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require 'rexml/document'
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require 'SVG/Graph/Graph'
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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 bar graphs easily
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#
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# = Synopsis
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#
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# require 'SVG/Graph/Bar'
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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::Bar.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[http://www.w3c.org/tr/svg bar graphs. You can either use the default
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# style sheet or supply your own. Either way there are many options which
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# can be configured to give you control over how the graph is generated -
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# with or without a key, data elements at each point, title, subtitle etc.
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#
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# = Notes
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#
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# The default stylesheet handles upto 12 data sets, if you
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# use more you must create your own stylesheet and add the
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# additional settings for the extra data sets. You will know
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# if you go over 12 data sets as they will have no style and
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# be in black.
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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::BarHorizontal
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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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class Bar < BarBase
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include REXML
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# See Graph::initialize and BarBase::set_defaults
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def set_defaults
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super
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self.top_align = self.top_font = 1
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end
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protected
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def get_x_labels
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@config[:fields]
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end
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def get_y_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 x_label_offset( width )
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width / 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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fieldwidth = field_width
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unit_size = (@graph_height.to_f - font_size*2*top_font) /
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(get_y_labels.max - get_y_labels.min)
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bargap = bar_gap ? (fieldwidth < 10 ? fieldwidth / 2 : 10) : 0
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bar_width = fieldwidth - bargap
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bar_width /= @data.length if stack == :side
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x_mod = (@graph_width-bargap)/2 - (stack==:side ? bar_width/2 : 0)
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bottom = @graph_height
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field_count = 0
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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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# cases (assume 0 = +ve):
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# value min length
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# +ve +ve value - min
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# +ve -ve value - 0
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# -ve -ve value.abs - 0
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value = dataset[:data][i]
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left = (fieldwidth * field_count)
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length = (value.abs - (minvalue > 0 ? minvalue : 0)) * unit_size
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# top is 0 if value is negative
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top = bottom - (((value < 0 ? 0 : value) - minvalue) * unit_size)
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left += bar_width * dataset_count if stack == :side
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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" => bar_width.to_s,
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"height" => length.to_s,
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"class" => "fill#{dataset_count+1}"
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})
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make_datapoint_text(left + bar_width/2.0, top - 6, value.to_s)
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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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