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396 lines
10 KiB
396 lines
10 KiB
require 'SVG/Graph/Graph'
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module SVG
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module Graph
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# === Create presentation quality SVG pie graphs easily
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#
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# == Synopsis
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#
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# require 'SVG/Graph/Pie'
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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::Pie.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 pie 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, display percent on pie chart,
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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://www.germane-software/repositories/public/SVG/test/single.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::Bar
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# * SVG::Graph::Line
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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 Pie < Graph
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# Defaults are those set by Graph::initialize, and
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# [show_shadow] true
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# [shadow_offset] 10
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# [show_data_labels] false
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# [show_actual_values] false
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# [show_percent] true
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# [show_key_data_labels] true
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# [show_key_actual_values] true
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# [show_key_percent] false
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# [expanded] false
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# [expand_greatest] false
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# [expand_gap] 10
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# [show_x_labels] false
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# [show_y_labels] false
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# [datapoint_font_size] 12
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def set_defaults
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init_with(
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:show_shadow => true,
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:shadow_offset => 10,
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:show_data_labels => false,
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:show_actual_values => false,
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:show_percent => true,
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:show_key_data_labels => true,
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:show_key_actual_values => true,
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:show_key_percent => false,
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:expanded => false,
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:expand_greatest => false,
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:expand_gap => 10,
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:show_x_labels => false,
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:show_y_labels => false,
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:datapoint_font_size => 12
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)
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@data = []
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end
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# Adds a data set to the graph.
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#
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# graph.add_data( { :data => [1,2,3,4] } )
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#
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# Note that the :title is not necessary. If multiple
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# data sets are added to the graph, the pie chart will
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# display the +sums+ of the data. EG:
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#
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# graph.add_data( { :data => [1,2,3,4] } )
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# graph.add_data( { :data => [2,3,5,9] } )
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#
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# is the same as:
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#
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# graph.add_data( { :data => [3,5,8,13] } )
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def add_data arg
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arg[:data].each_index {|idx|
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@data[idx] = 0 unless @data[idx]
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@data[idx] += arg[:data][idx]
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}
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end
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# If true, displays a drop shadow for the chart
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attr_accessor :show_shadow
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# Sets the offset of the shadow from the pie chart
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attr_accessor :shadow_offset
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# If true, display the data labels on the chart
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attr_accessor :show_data_labels
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# If true, display the actual field values in the data labels
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attr_accessor :show_actual_values
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# If true, display the percentage value of each pie wedge in the data
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# labels
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attr_accessor :show_percent
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# If true, display the labels in the key
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attr_accessor :show_key_data_labels
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# If true, display the actual value of the field in the key
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attr_accessor :show_key_actual_values
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# If true, display the percentage value of the wedges in the key
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attr_accessor :show_key_percent
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# If true, "explode" the pie (put space between the wedges)
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attr_accessor :expanded
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# If true, expand the largest pie wedge
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attr_accessor :expand_greatest
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# The amount of space between expanded wedges
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attr_accessor :expand_gap
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# The font size of the data point labels
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attr_accessor :datapoint_font_size
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protected
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def add_defs defs
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gradient = defs.add_element( "filter", {
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"id"=>"dropshadow",
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"width" => "1.2",
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"height" => "1.2",
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} )
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gradient.add_element( "feGaussianBlur", {
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"stdDeviation" => "4",
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"result" => "blur"
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})
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end
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# We don't need the graph
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def draw_graph
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end
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def get_y_labels
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[""]
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end
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def get_x_labels
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[""]
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end
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def keys
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total = 0
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max_value = 0
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@data.each {|x| total += x }
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percent_scale = 100.0 / total
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count = -1
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a = @config[:fields].collect{ |x|
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count += 1
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v = @data[count]
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perc = show_key_percent ? " "+(v * percent_scale).round.to_s+"%" : ""
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x + " [" + v.to_s + "]" + perc
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}
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end
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RADIANS = Math::PI/180
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def draw_data
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@graph = @root.add_element( "g" )
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background = @graph.add_element("g")
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midground = @graph.add_element("g")
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diameter = @graph_height > @graph_width ? @graph_width : @graph_height
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diameter -= expand_gap if expanded or expand_greatest
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diameter -= datapoint_font_size if show_data_labels
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diameter -= 10 if show_shadow
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radius = diameter / 2.0
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xoff = (width - diameter) / 2
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yoff = (height - @border_bottom - diameter)
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yoff -= 10 if show_shadow
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@graph.attributes['transform'] = "translate( #{xoff} #{yoff} )"
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wedge_text_pad = 5
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wedge_text_pad = 20 if show_percent and show_data_labels
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total = 0
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max_value = 0
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@data.each {|x|
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max_value = max_value < x ? x : max_value
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total += x
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}
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percent_scale = 100.0 / total
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prev_percent = 0
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rad_mult = 3.6 * RADIANS
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@config[:fields].each_index { |count|
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value = @data[count]
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percent = percent_scale * value
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radians = prev_percent * rad_mult
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x_start = radius+(Math.sin(radians) * radius)
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y_start = radius-(Math.cos(radians) * radius)
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radians = (prev_percent+percent) * rad_mult
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x_end = radius+(Math.sin(radians) * radius)
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x_end -= 0.00001 if @data.length == 1
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y_end = radius-(Math.cos(radians) * radius)
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path = "M#{radius},#{radius} L#{x_start},#{y_start} "+
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"A#{radius},#{radius} "+
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"0, #{percent >= 50 ? '1' : '0'},1, "+
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"#{x_end} #{y_end} Z"
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wedge = @foreground.add_element( "path", {
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"d" => path,
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"class" => "fill#{count+1}"
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})
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translate = nil
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tx = 0
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ty = 0
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half_percent = prev_percent + percent / 2
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radians = half_percent * rad_mult
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if show_shadow
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shadow = background.add_element( "path", {
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"d" => path,
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"filter" => "url(#dropshadow)",
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"style" => "fill: #ccc; stroke: none;"
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})
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clear = midground.add_element( "path", {
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"d" => path,
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"style" => "fill: #fff; stroke: none;"
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})
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end
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if expanded or (expand_greatest && value == max_value)
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tx = (Math.sin(radians) * expand_gap)
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ty = -(Math.cos(radians) * expand_gap)
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translate = "translate( #{tx} #{ty} )"
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wedge.attributes["transform"] = translate
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clear.attributes["transform"] = translate if clear
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end
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if show_shadow
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shadow.attributes["transform"] =
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"translate( #{tx+shadow_offset} #{ty+shadow_offset} )"
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end
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if show_data_labels and value != 0
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label = ""
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label += @config[:fields][count] if show_key_data_labels
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label += " ["+value.to_s+"]" if show_actual_values
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label += " "+percent.round.to_s+"%" if show_percent
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msr = Math.sin(radians)
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mcr = Math.cos(radians)
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tx = radius + (msr * radius)
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ty = radius -(mcr * radius)
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if expanded or (expand_greatest && value == max_value)
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tx += (msr * expand_gap)
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ty -= (mcr * expand_gap)
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end
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@foreground.add_element( "text", {
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"x" => tx.to_s,
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"y" => ty.to_s,
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"class" => "dataPointLabel",
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"style" => "stroke: #fff; stroke-width: 2;"
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}).text = label.to_s
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@foreground.add_element( "text", {
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"x" => tx.to_s,
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"y" => ty.to_s,
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"class" => "dataPointLabel",
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}).text = label.to_s
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end
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prev_percent += percent
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}
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end
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def round val, to
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up = 10**to.to_f
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(val * up).to_i / up
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end
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def get_css
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return <<EOL
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.dataPointLabel{
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fill: #000000;
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text-anchor:middle;
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font-size: #{datapoint_font_size}px;
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font-family: "Arial", sans-serif;
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font-weight: normal;
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}
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/* key - MUST match fill styles */
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.key1,.fill1{
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fill: #ff0000;
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fill-opacity: 0.7;
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stroke: none;
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stroke-width: 1px;
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}
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.key2,.fill2{
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fill: #0000ff;
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fill-opacity: 0.7;
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stroke: none;
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stroke-width: 1px;
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}
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.key3,.fill3{
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fill-opacity: 0.7;
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fill: #00ff00;
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stroke: none;
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stroke-width: 1px;
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}
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.key4,.fill4{
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fill-opacity: 0.7;
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fill: #ffcc00;
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stroke: none;
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stroke-width: 1px;
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}
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.key5,.fill5{
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fill-opacity: 0.7;
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fill: #00ccff;
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stroke: none;
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stroke-width: 1px;
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}
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.key6,.fill6{
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fill-opacity: 0.7;
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fill: #ff00ff;
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stroke: none;
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stroke-width: 1px;
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}
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.key7,.fill7{
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fill-opacity: 0.7;
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fill: #00ff99;
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stroke: none;
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stroke-width: 1px;
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}
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.key8,.fill8{
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fill-opacity: 0.7;
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fill: #ffff00;
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stroke: none;
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stroke-width: 1px;
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}
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.key9,.fill9{
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fill-opacity: 0.7;
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fill: #cc6666;
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stroke: none;
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stroke-width: 1px;
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}
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.key10,.fill10{
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fill-opacity: 0.7;
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fill: #663399;
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stroke: none;
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stroke-width: 1px;
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}
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.key11,.fill11{
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fill-opacity: 0.7;
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fill: #339900;
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stroke: none;
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stroke-width: 1px;
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}
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.key12,.fill12{
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fill-opacity: 0.7;
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fill: #9966FF;
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stroke: none;
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stroke-width: 1px;
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}
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EOL
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end
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end
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end
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end
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