chart_secondary_axis.rb

#!/usr/bin/env ruby
# -*- coding: utf-8 -*-

#######################################################################
#
# A demo of a Line chart with a secondary axis in WriteXLSX.
#
# reverse(c), March 2011, John McNamara, jmcnamara@cpan.org
# convert to ruby by Hideo NAKAMURA, nakamura.hideo@gmail.com
#

require 'write_xlsx'

workbook  = WriteXLSX.new('chart_secondary_axis.xlsx')
worksheet = workbook.add_worksheet
bold      = workbook.add_format(bold: 1)

# Add the worksheet data that the charts will refer to.
headings = %w[Aliens Humans]
data = [
  [2,  3,  4,  5,  6,  7],
  [10, 40, 50, 20, 10, 50]
]

worksheet.write('A1', headings, bold)
worksheet.write('A2', data)

# Create a new chart object. In this case an embedded chart.
chart = workbook.add_chart(type: 'line', embedded: 1)

# Configure the first series.
chart.add_series(
  name:    '=Sheet1!$A$1',
  values:  '=Sheet1!$A$2:$A$7',
  y2_axis: 1
)

chart.add_series(
  name:   '=Sheet1!$B$1',
  values: '=Sheet1!$B$2:$B$7'
)

chart.set_legend(position: 'right')

# Add a chart title and some axis labels.
chart.set_title(name: 'Survey results')
chart.set_x_axis(name: 'Days')
chart.set_y_axis(name: 'Population', major_gridlines: { visible: 0 })
chart.set_y2_axis(name: 'Laser wounds')

# Insert the chart into the worksheet (with an offset).
worksheet.insert_chart(
  'D2', chart,
  x_offset: 25, y_offset: 10
)

workbook.close