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require 'SVG/Graph/Plot'
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
t = DateTime.parse( data[:data][i] ).to_time
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)
@min_x_value = DateTime.parse( value ).to_time
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
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