ruby SVG::Graph module problem.

[Guest]

Hello there all,

As my "learn Ruby" project I am creating a replacement for mrtg-rrd.cgi
in ruby. (i.e. create TimeSeries graphs from RRD databases as SVG. Much
nicer than PNG graphs).

Using SVG::Graph and rrd-ruby (from
http://www.germane-software.com/software/SVG/SVG::Graph/ and
http://www.caddr.com/code/ruby-rrd-1.0.tar.gz respectively.)

So, starting with the SVG mod, I am working through the examples
included and all works as expected.

Except for anything including Time / Dates - SVG::Graph::TimeSeries and
SVG::Graph::Schedule.

Could this be a localisation issue? (I'm in the UK).
A bug in the module?

#======Code==========
#!/usr/bin/ruby
require 'SVG/Graph/TimeSeries'
# Data sets are x,y pairs
data1 = ["17/6/72", 11, "11/1/72", 7, "13/4/04 17:31", 11, "11/9/01", 9,
"11/9/85", 2, "1/9/88", 1, "15/1/95", 13]
data2 = ["1/8/73", 18, "1/2/77", 15, "1/10/98", 4, "1/5/02", 14,
"1/3/95", 6, "1/8/91", 12, "1/12/87", 6, "1/5/84", 17, "1/10/80", 12]
title = "This is the title"
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 => "%d/%m/%y",
})
graph.add_data({
:data => data1,
:title => "Projected",
})
graph.add_data({
:data => data2,
:title => "Actual",
})

print graph.burn()
#==========================

#========output============
c:/ruby/lib/ruby/1.8/date/format.rb:236:in `dup': can't dup Fixnum
(TypeError)
from c:/ruby/lib/ruby/1.8/date/format.rb:236:in `_parse'
from c:/ruby/lib/ruby/1.8/parsedate.rb:9:in `parsedate'
from
c:/ruby/lib/ruby/site_ruby/1.8/SVG/Graph/TimeSeries.rb:176:in
`min_x_value='
from c:/ruby/lib/ruby/site_ruby/1.8/SVG/Graph/Graph.rb:358:in
`send'
from c:/ruby/lib/ruby/site_ruby/1.8/SVG/Graph/Graph.rb:358:in
`init_with'
from c:/ruby/lib/ruby/site_ruby/1.8/SVG/Graph/Graph.rb:357:in
`each'
from c:/ruby/lib/ruby/site_ruby/1.8/SVG/Graph/Graph.rb:357:in
`init_with'
from c:/ruby/lib/ruby/site_ruby/1.8/SVG/Graph/Graph.rb:155:in
`initialize'
from svg_time_series.rb:7:in `new'
from svg_time_series.rb:7
==========================

Any hints / tips / suggestions?

I've tried contacting the module author with no success so I was
wondering if it was anything obvious to you hardened Ruby folk.

Please help me avoid using Perl!!

Many thanks in advance,

SM

PS. Same results using ruby 1.8.2 from the one-click installer on WinXP
and Fedora Core 4 - test2. Both systems localised to en_GB.

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[Gavin Kistner]

Could this be a localisation issue? (I'm in the UK).

Yes, I believe so. I see you have:

data1 = ["17/6/72", 11, "11/1/72", 7, "13/4/04 17:31", 11, "11/9/01",
9,
"11/9/85", 2, "1/9/88", 1, "15/1/95", 13]

and then I see errors during the parsing. It appears that you have your
dates in dd/mm/yy format; Parsedate.parsedate requires 'mm/dd/yy' when
only that information is supplied.

See the table on page 733 of Pickaxe 2, or
http://phrogz.net/ProgrammingRuby/lib_standard.html#ParseDate

 

[SER]

Simon,

I got your email; I just haven't had time to look into the issue.

--- SER