SVG::Graph::Plot

0.4.0

For creating SVG plots of scalar data

Synopsis

  require 'SVG/Graph/Plot'

  # Data sets are x,y pairs
  # Note that multiple data sets 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.
  projection = %w{
    6 11    0 5   18 7   1 11   13 9   1 2   19 0   3 13   7 9
  }
  actual = %w {
    0 18    8 15    9 4   18 14   10 2   11 6  14 12   15 6   4 17   2 12
  }

  graph = SVG::Graph::Plot.new({
          :height => 500,
          :width => 300,
    :key => true,
    :scale_x_integers => true,
    :scale_y_integerrs => true,
  })

  graph.add_data({
          :data => projection
    :title => 'Projected',
  })

  graph.add_data({
          :data => actual,
    :title => 'Actual',
  })

  print graph.burn()

Description

Produces a graph of scalar data.

This object aims to allow you to easily create high quality SVG line graphs. You can either use the default style sheet or supply your own. Either way there are many options which can be configured to give you control over how the graph is generated - with or without a key, data elements at each point, title, subtitle etc.

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:

  [ 1, 2 ]    # A data set with 1 point: (1,2)
  [ 1,2, 5,6] # A data set with 2 points: (1,2) and (5,6)