comparison lib/SVG/Graph/.svn/text-base/TimeSeries.rb.svn-base @ 0:513646585e45

* Import Redmine trunk SVN rev 3859

+require 'SVG/Graph/Plot'
+require 'parsedate'
+
+module SVG
+  module Graph
+    # === For creating SVG plots of scalar temporal data
+    # 
+    # = Synopsis
+    # 
+    #   require 'SVG/Graph/TimeSeriess'
+    # 
+    #   # Data sets are x,y pairs
+    #   data1 = ["6/17/72", 11,    "1/11/72", 7,    "4/13/04 17:31", 11, 
+    #           "9/11/01", 9,    "9/1/85", 2,    "9/1/88", 1,    "1/15/95", 13]
+    #   data2 = ["8/1/73", 18,    "3/1/77", 15,    "10/1/98", 4, 
+    #           "5/1/02", 14,    "3/1/95", 6,    "8/1/91", 12,    "12/1/87", 6, 
+    #           "5/1/84", 17,    "10/1/80", 12]
+    #
+    #   graph = SVG::Graph::TimeSeries.new( {
+    #     :width => 640,
+    #     :height => 480,
+    #     :graph_title => title,
+    #     :show_graph_title => true,
+    #     :no_css => true,
+    #     :key => true,
+    #     :scale_x_integers => true,
+    #     :scale_y_integers => true,
+    #     :min_x_value => 0,
+    #     :min_y_value => 0,
+    #     :show_data_labels => true,
+    #     :show_x_guidelines => true,
+    #     :show_x_title => true,
+    #     :x_title => "Time",
+    #     :show_y_title => true,
+    #     :y_title => "Ice Cream Cones",
+    #     :y_title_text_direction => :bt,
+    #     :stagger_x_labels => true,
+    #     :x_label_format => "%m/%d/%y",
+    #   })
+    #   
+    #   graph.add_data({
+    #   	:data => projection
+    # 	  :title => 'Projected',
+    #   })
+    # 
+    #   graph.add_data({
+    #   	:data => actual,
+    # 	  :title => 'Actual',
+    #   })
+    #   
+    #   print graph.burn()
+    #
+    # = Description
+    # 
+    # Produces a graph of temporal scalar data.
+    # 
+    # = Examples
+    #
+    # http://www.germane-software/repositories/public/SVG/test/timeseries.rb
+    # 
+    # = Notes
+    # 
+    # The default stylesheet handles upto 10 data sets, if you
+    # use more you must create your own stylesheet and add the
+    # additional settings for the extra data sets. You will know
+    # if you go over 10 data sets as they will have no style and
+    # be in black.
+    #
+    # Unlike the other types of charts, data sets must contain x,y pairs:
+    #
+    #   [ "12:30", 2 ]          # A data set with 1 point: ("12:30",2)
+    #   [ "01:00",2, "14:20",6] # A data set with 2 points: ("01:00",2) and 
+    #                           #                           ("14:20",6)  
+    #
+    # Note that multiple data sets within the same chart can differ in length, 
+    # and that the data in the datasets needn't be in order; they will be ordered
+    # by the plot along the X-axis.
+    # 
+    # The dates must be parseable by ParseDate, but otherwise can be
+    # any order of magnitude (seconds within the hour, or years)
+    # 
+    # = See also
+    # 
+    # * SVG::Graph::Graph
+    # * SVG::Graph::BarHorizontal
+    # * SVG::Graph::Bar
+    # * SVG::Graph::Line
+    # * SVG::Graph::Pie
+    # * SVG::Graph::Plot
+    #
+    # == Author
+    #
+    # Sean E. Russell <serATgermaneHYPHENsoftwareDOTcom>
+    #
+    # Copyright 2004 Sean E. Russell
+    # This software is available under the Ruby license[LICENSE.txt]
+    #
+    class TimeSeries < Plot
+      # In addition to the defaults set by Graph::initialize and
+      # Plot::set_defaults, sets:
+      # [x_label_format] '%Y-%m-%d %H:%M:%S'
+      # [popup_format]  '%Y-%m-%d %H:%M:%S'
+      def set_defaults
+        super
+        init_with(
+          #:max_time_span     => '',
+          :x_label_format     => '%Y-%m-%d %H:%M:%S',
+          :popup_format       => '%Y-%m-%d %H:%M:%S'
+        )
+      end
+
+      # The format string use do format the X axis labels.
+      # See Time::strformat
+      attr_accessor :x_label_format
+      # Use this to set the spacing between dates on the axis.  The value
+      # must be of the form 
+      # "\d+ ?(days|weeks|months|years|hours|minutes|seconds)?"
+      # 
+      # EG:
+      #
+      #   graph.timescale_divisions = "2 weeks"
+      #
+      # will cause the chart to try to divide the X axis up into segments of
+      # two week periods.
+      attr_accessor :timescale_divisions
+      # The formatting used for the popups.  See x_label_format
+      attr_accessor :popup_format
+
+      # Add data to the plot.
+      #
+      #   d1 = [ "12:30", 2 ]          # A data set with 1 point: ("12:30",2)
+      #   d2 = [ "01:00",2, "14:20",6] # A data set with 2 points: ("01:00",2) and 
+      #                                #                           ("14:20",6)  
+      #   graph.add_data( 
+      #     :data => d1,
+      #     :title => 'One'
+      #   )
+      #   graph.add_data(
+      #     :data => d2,
+      #     :title => 'Two'
+      #   )
+      #
+      # Note that the data must be in time,value pairs, and that the date format
+      # may be any date that is parseable by ParseDate.
+      def add_data data
+        @data = [] unless @data
+       
+        raise "No data provided by #{@data.inspect}" unless data[:data] and
+                                                    data[:data].kind_of? Array
+        raise "Data supplied must be x,y pairs!  "+
+          "The data provided contained an odd set of "+
+          "data points" unless data[:data].length % 2 == 0
+        return if data[:data].length == 0
+
+
+        x = []
+        y = []
+        data[:data].each_index {|i|
+          if i%2 == 0
+            arr = ParseDate.parsedate( data[:data][i] )
+            t = Time.local( *arr[0,6].compact )
+            x << t.to_i
+          else
+            y << data[:data][i]
+          end
+        }
+        sort( x, y )
+        data[:data] = [x,y]
+        @data << data
+      end
+
+
+      protected
+
+      def min_x_value=(value)
+        arr = ParseDate.parsedate( value )
+        @min_x_value = Time.local( *arr[0,6].compact ).to_i
+      end
+
+
+      def format x, y
+        Time.at( x ).strftime( popup_format )
+      end
+
+      def get_x_labels
+        get_x_values.collect { |v| Time.at(v).strftime( x_label_format ) }
+      end
+      
+      private
+      def get_x_values
+        rv = []
+        min, max, scale_division = x_range
+        if timescale_divisions
+          timescale_divisions =~ /(\d+) ?(day|week|month|year|hour|minute|second)?/
+          division_units = $2 ? $2 : "day"
+          amount = $1.to_i
+          if amount
+            step =  nil
+            case division_units
+            when "month"
+              cur = min
+              while cur < max
+                rv << cur
+                arr = Time.at( cur ).to_a
+                arr[4] += amount
+                if arr[4] > 12
+                  arr[5] += (arr[4] / 12).to_i
+                  arr[4] = (arr[4] % 12)
+                end
+                cur = Time.local(*arr).to_i
+              end
+            when "year"
+              cur = min
+              while cur < max
+                rv << cur
+                arr = Time.at( cur ).to_a
+                arr[5] += amount
+                cur = Time.local(*arr).to_i
+              end
+            when "week"
+              step = 7 * 24 * 60 * 60 * amount
+            when "day"
+              step = 24 * 60 * 60 * amount
+            when "hour"
+              step = 60 * 60 * amount
+            when "minute"
+              step = 60 * amount
+            when "second"
+              step = amount
+            end
+            min.step( max, step ) {|v| rv << v} if step
+
+            return rv
+          end
+        end
+        min.step( max, scale_division ) {|v| rv << v}
+        return rv
+      end
+    end
+  end
+end