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

#######################################################################
#
# A demo of a Scatter chart in Excel::Writer::XLSX.
#
# 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_scatter.xlsx')
worksheet = workbook.add_worksheet
bold      = workbook.add_format(:bold => 1)

# Add the worksheet data that the charts will refer to.
headings = [ 'Number', 'Batch 1', 'Batch 2' ]
data = [
    [ 2, 3, 4, 5, 6, 7 ],
    [ 10, 40, 50, 20, 10, 50 ],
    [ 30, 60, 70, 50, 40, 30 ]
]

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 => 'scatter', :embedded => 1)

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

# Configure second series. Note alternative use of array ref to define
# ranges: [ $sheetname, $row_start, $row_end, $col_start, $col_end ].
chart.add_series(
    :name       => '=Sheet1!$C$1',
    :categories => [ 'Sheet1', 1, 6, 0, 0 ],
    :values     => [ 'Sheet1', 1, 6, 2, 2 ]
)

# Add a chart title and some axis labels.
chart.set_title(:name => 'Results of sample analysis')
chart.set_x_axis(:name => 'Test number')
chart.set_y_axis(:name => 'Sample length (mm)')

# Set an Excel chart style. Blue colors with white outline and shadow.
chart.set_style(10)

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

workbook.close
