view lib/SVG/Graph/.svn/text-base/BarHorizontal.rb.svn-base @ 922:ad295b270cd4 live

FIx #446: "non-utf8 paths in repositories blow up repo viewer and reposman" by ensuring the iconv conversion always happens even if source and dest are intended to be the same encoding

require 'rexml/document'
require 'SVG/Graph/BarBase'

module SVG
  module Graph
    # === Create presentation quality SVG horitonzal bar graphs easily
    # 
    # = Synopsis
    # 
    #   require 'SVG/Graph/BarHorizontal'
    #   
    #   fields = %w(Jan Feb Mar)
    #   data_sales_02 = [12, 45, 21]
    #   
    #   graph = SVG::Graph::BarHorizontal.new({
    #     :height => 500,
    #     :width => 300,
    #     :fields => fields,
    #   })
    #   
    #   graph.add_data({
    #     :data => data_sales_02,
    #     :title => 'Sales 2002',
    #   })
    #   
    #   print "Content-type: image/svg+xml\r\n\r\n"
    #   print graph.burn
    # 
    # = Description
    # 
    # This object aims to allow you to easily create high quality
    # SVG horitonzal bar graphs. You can either use the default style sheet
    # or supply your own. Either way there are many options which can
    # be configured to give you control over how the graph is
    # generated - with or without a key, data elements at each point,
    # title, subtitle etc.
    # 
    # = Examples
    # 
    # * http://germane-software.com/repositories/public/SVG/test/test.rb
    # 
    # = See also
    # 
    # * SVG::Graph::Graph
    # * SVG::Graph::Bar
    # * SVG::Graph::Line
    # * SVG::Graph::Pie
    # * SVG::Graph::Plot
    # * SVG::Graph::TimeSeries
    #
    # == Author
    #
    # Sean E. Russell <serATgermaneHYPHENsoftwareDOTcom>
    #
    # Copyright 2004 Sean E. Russell
    # This software is available under the Ruby license[LICENSE.txt]
    #
    class BarHorizontal < BarBase
      # In addition to the defaults set in BarBase::set_defaults, sets
      # [rotate_y_labels] true
      # [show_x_guidelines] true
      # [show_y_guidelines] false
      def set_defaults
        super
        init_with( 
          :rotate_y_labels    => true,
          :show_x_guidelines  => true,
          :show_y_guidelines  => false
        )
        self.right_align = self.right_font = 1
      end
  
      protected

      def get_x_labels
        maxvalue = max_value
        minvalue = min_value
        range = maxvalue - minvalue
        top_pad = range == 0 ? 10 : range / 20.0
        scale_range = (maxvalue + top_pad) - minvalue

        scale_division = scale_divisions || (scale_range / 10.0)

        if scale_integers
          scale_division = scale_division < 1 ? 1 : scale_division.round
        end

        rv = []
        maxvalue = maxvalue%scale_division == 0 ? 
          maxvalue : maxvalue + scale_division
        minvalue.step( maxvalue, scale_division ) {|v| rv << v}
        return rv
      end

      def get_y_labels
        @config[:fields]
      end

      def y_label_offset( height )
        height / -2.0
      end

      def draw_data
        minvalue = min_value
        fieldheight = field_height

        unit_size = (@graph_width.to_f - font_size*2*right_font ) /
                        (get_x_labels.max - get_x_labels.min )
        bargap = bar_gap ? (fieldheight < 10 ? fieldheight / 2 : 10) : 0

        bar_height = fieldheight - bargap
        bar_height /= @data.length if stack == :side
        y_mod = (bar_height / 2) + (font_size / 2)
        
        field_count = 1
        @config[:fields].each_index { |i|
          dataset_count = 0
          for dataset in @data
            value = dataset[:data][i]
            
            top = @graph_height - (fieldheight * field_count)
            top += (bar_height * dataset_count) if stack == :side
            # cases (assume 0 = +ve):
            #   value  min  length          left
            #    +ve   +ve  value.abs - min minvalue.abs
            #    +ve   -ve  value.abs - 0   minvalue.abs
            #    -ve   -ve  value.abs - 0   minvalue.abs + value
            length = (value.abs - (minvalue > 0 ? minvalue : 0)) * unit_size
            left = (minvalue.abs + (value < 0 ? value : 0)) * unit_size

            @graph.add_element( "rect", {
              "x" => left.to_s,
              "y" => top.to_s,
              "width" => length.to_s,
              "height" => bar_height.to_s,
              "class" => "fill#{dataset_count+1}"
            })

            make_datapoint_text( 
              left+length+5, top+y_mod, value, "text-anchor: start; "
              )
            dataset_count += 1
          end
          field_count += 1
        }
      end
    end
  end
end