Class | SVG::Graph::TimeSeries |
In: |
lib/SVG/Graph/TimeSeries.rb
|
Parent: | Plot |
require 'SVG/Graph/TimeSeries' # Data sets are x,y pairs projection = ["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] actual = ["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] title = "Ice Cream Cone Consumption" 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_values => 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()
Produces a graph of temporal scalar data.
www.germane-software/repositories/public/SVG/test/timeseries.rb
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)
Sean E. Russell <serATgermaneHYPHENsoftwareDOTcom>
Copyright 2004 Sean E. Russell This software is available under the Ruby license
popup_format | [RW] | The formatting used for the popups. See x_label_format |
timescale_divisions | [RW] |
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. |
x_label_format | [RW] | The format string use do format the X axis labels. See Time::strformat |
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. The time may be any date in a format that is parseable by ParseDate, a Time object, or a number of seconds after the unix epoch.
# File lib/SVG/Graph/TimeSeries.rb, line 151 151: def add_data data 152: data[:data].each_index do |i| 153: data[:data][i] = parse_time(data[:data][i]).to_i if i % 2 == 0 154: end 155: super(data) 156: end
In addition to the defaults set by Graph::initialize and Plot::set_defaults, sets:
# File lib/SVG/Graph/TimeSeries.rb, line 108 108: def set_defaults 109: super 110: init_with( 111: #:max_time_span => '', 112: :x_label_format => '%Y-%m-%d %H:%M:%S', 113: :popup_format => '%Y-%m-%d %H:%M:%S' 114: ) 115: end
# File lib/SVG/Graph/TimeSeries.rb, line 171 171: def format x, y, description 172: info = [ 173: Time.at(x).strftime(popup_format), 174: round_popups ? (y * 100).to_i / 100 : y, 175: description 176: ].compact.join(', ') 177: end
# File lib/SVG/Graph/TimeSeries.rb, line 179 179: def get_x_labels 180: get_x_values.collect { |v| Time.at(v).strftime( x_label_format ) } 181: end
# File lib/SVG/Graph/TimeSeries.rb, line 166 166: def max_x_value=(value) 167: t = parse_time(value) 168: @max_x_value = t.to_i 169: end