239 lines
7.3 KiB
Ruby
239 lines
7.3 KiB
Ruby
require 'SVG/Graph/Plot'
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module SVG
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module Graph
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# === For creating SVG plots of scalar temporal data
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#
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# = Synopsis
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#
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# require 'SVG/Graph/TimeSeriess'
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#
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# # Data sets are x,y pairs
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# data1 = ["6/17/72", 11, "1/11/72", 7, "4/13/04 17:31", 11,
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# "9/11/01", 9, "9/1/85", 2, "9/1/88", 1, "1/15/95", 13]
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# data2 = ["8/1/73", 18, "3/1/77", 15, "10/1/98", 4,
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# "5/1/02", 14, "3/1/95", 6, "8/1/91", 12, "12/1/87", 6,
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# "5/1/84", 17, "10/1/80", 12]
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#
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# graph = SVG::Graph::TimeSeries.new( {
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# :width => 640,
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# :height => 480,
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# :graph_title => title,
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# :show_graph_title => true,
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# :no_css => true,
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# :key => true,
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# :scale_x_integers => true,
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# :scale_y_integers => true,
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# :min_x_value => 0,
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# :min_y_value => 0,
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# :show_data_labels => true,
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# :show_x_guidelines => true,
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# :show_x_title => true,
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# :x_title => "Time",
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# :show_y_title => true,
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# :y_title => "Ice Cream Cones",
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# :y_title_text_direction => :bt,
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# :stagger_x_labels => true,
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# :x_label_format => "%m/%d/%y",
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# })
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#
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# graph.add_data({
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# :data => projection
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# :title => 'Projected',
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# })
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#
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# graph.add_data({
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# :data => actual,
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# :title => 'Actual',
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# })
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#
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# print graph.burn()
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#
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# = Description
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#
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# Produces a graph of temporal scalar data.
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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/timeseries.rb
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#
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# = Notes
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#
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# The default stylesheet handles upto 10 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 10 data sets as they will have no style and
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# be in black.
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#
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# Unlike the other types of charts, data sets must contain x,y pairs:
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#
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# [ "12:30", 2 ] # A data set with 1 point: ("12:30",2)
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# [ "01:00",2, "14:20",6] # A data set with 2 points: ("01:00",2) and
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# # ("14:20",6)
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#
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# Note that multiple data sets within the same chart can differ in length,
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# and that the data in the datasets needn't be in order; they will be ordered
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# by the plot along the X-axis.
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#
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# The dates must be parseable by ParseDate, but otherwise can be
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# any order of magnitude (seconds within the hour, or years)
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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::Pie
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# * SVG::Graph::Plot
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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 TimeSeries < Plot
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# In addition to the defaults set by Graph::initialize and
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# Plot::set_defaults, sets:
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# [x_label_format] '%Y-%m-%d %H:%M:%S'
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# [popup_format] '%Y-%m-%d %H:%M:%S'
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def set_defaults
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super
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init_with(
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#:max_time_span => '',
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:x_label_format => '%Y-%m-%d %H:%M:%S',
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:popup_format => '%Y-%m-%d %H:%M:%S'
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)
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end
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# The format string use do format the X axis labels.
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# See Time::strformat
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attr_accessor :x_label_format
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# Use this to set the spacing between dates on the axis. The value
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# must be of the form
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# "\d+ ?(days|weeks|months|years|hours|minutes|seconds)?"
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#
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# EG:
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#
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# graph.timescale_divisions = "2 weeks"
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#
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# will cause the chart to try to divide the X axis up into segments of
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# two week periods.
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attr_accessor :timescale_divisions
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# The formatting used for the popups. See x_label_format
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attr_accessor :popup_format
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# Add data to the plot.
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#
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# d1 = [ "12:30", 2 ] # A data set with 1 point: ("12:30",2)
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# d2 = [ "01:00",2, "14:20",6] # A data set with 2 points: ("01:00",2) and
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# # ("14:20",6)
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# graph.add_data(
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# :data => d1,
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# :title => 'One'
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# )
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# graph.add_data(
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# :data => d2,
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# :title => 'Two'
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# )
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#
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# Note that the data must be in time,value pairs, and that the date format
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# may be any date that is parseable by ParseDate.
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def add_data data
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@data = [] unless @data
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raise "No data provided by #{@data.inspect}" unless data[:data] and
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data[:data].kind_of? Array
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raise "Data supplied must be x,y pairs! "+
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"The data provided contained an odd set of "+
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"data points" unless data[:data].length % 2 == 0
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return if data[:data].length == 0
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x = []
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y = []
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data[:data].each_index {|i|
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if i%2 == 0
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t = DateTime.parse( data[:data][i] ).to_time
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x << t.to_i
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else
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y << data[:data][i]
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end
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}
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sort( x, y )
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data[:data] = [x,y]
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@data << data
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end
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protected
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def min_x_value=(value)
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@min_x_value = DateTime.parse( value ).to_time
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end
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def format x, y
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Time.at( x ).strftime( popup_format )
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end
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def get_x_labels
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get_x_values.collect { |v| Time.at(v).strftime( x_label_format ) }
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end
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private
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def get_x_values
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rv = []
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min, max, scale_division = x_range
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if timescale_divisions
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timescale_divisions =~ /(\d+) ?(day|week|month|year|hour|minute|second)?/
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division_units = $2 ? $2 : "day"
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amount = $1.to_i
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if amount
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step = nil
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case division_units
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when "month"
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cur = min
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while cur < max
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rv << cur
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arr = Time.at( cur ).to_a
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arr[4] += amount
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if arr[4] > 12
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arr[5] += (arr[4] / 12).to_i
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arr[4] = (arr[4] % 12)
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end
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cur = Time.local(*arr).to_i
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end
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when "year"
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cur = min
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while cur < max
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rv << cur
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arr = Time.at( cur ).to_a
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arr[5] += amount
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cur = Time.local(*arr).to_i
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end
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when "week"
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step = 7 * 24 * 60 * 60 * amount
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when "day"
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step = 24 * 60 * 60 * amount
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when "hour"
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step = 60 * 60 * amount
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when "minute"
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step = 60 * amount
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when "second"
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step = amount
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end
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min.step( max, step ) {|v| rv << v} if step
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return rv
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end
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end
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min.step( max, scale_division ) {|v| rv << v}
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return rv
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end
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end
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end
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end
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