PDF::Writer：PDF::Charts::StdDev#dot, #dot=, #bar, #bar=, #upper_crossbar, #upper_crossbar=, #lower_crossbar, #lower_crossbar=

require 'pdf/charts/stddev'

pdf = PDF::Writer.new

chart = PDF::Charts::StdDev.new

p chart.dot
p chart.bar
p chart.upper_crossbar
p chart.lower_crossbar

で、

#<PDF::Charts::StdDev::Marker:0x40387c4c @color=#<Color::RGB:0x402688ac @b=0.0, @g=0.0, @r=0.0>, @style=#<PDF::Writer::StrokeStyle:0x40387bc0 @width=5, @dash=nil, @join=nil, @cap=nil, @miter_limit=nil>>
#<PDF::Charts::StdDev::Marker:0x40387c24 @color=#<Color::RGB:0x402688ac @b=0.0, @g=0.0, @r=0.0>, @style=#<PDF::Writer::StrokeStyle:0x40387b48 @width=0.5, @dash=nil, @join=nil, @cap=nil, @miter_limit=nil>>
#<PDF::Charts::StdDev::Marker:0x40387c10 @color=#<Color::RGB:0x402688ac @b=0.0, @g=0.0, @r=0.0>, @style=#<PDF::Writer::StrokeStyle:0x40387abc @width=1, @dash=nil, @join=nil, @cap=nil, @miter_limit=nil>>
#<PDF::Charts::StdDev::Marker:0x40387b70 @color=#<Color::RGB:0x402688ac @b=0.0, @g=0.0, @r=0.0>, @style=#<PDF::Writer::StrokeStyle:0x40387a58 @width=1, @dash=nil, @join=nil, @cap=nil, @miter_limit=nil>>

require 'pdf/charts/stddev'

pdf = PDF::Writer.new

chart = PDF::Charts::StdDev.new

chart.dot = nil
chart.bar = nil
chart.upper_crossbar = nil
chart.lower_crossbar = nil

chart.data << PDF::Charts::StdDev::DataPoint.new(1, 4.0000, 0.5774)
chart.render_on pdf

pdf.save_as("2008043001.pdf")

require 'pdf/charts/stddev'

pdf = PDF::Writer.new

chart = PDF::Charts::StdDev.new

chart.dot = PDF::Charts::StdDev::Marker.new do |marker|
  marker.style = PDF::Writer::StrokeStyle.new(1.5)
  marker.color = Color::RGB::Blue
end
chart.bar = PDF::Charts::StdDev::Marker.new do |marker|
  marker.style = PDF::Writer::StrokeStyle.new(1.5)
  marker.color = Color::RGB::Red
end
chart.upper_crossbar = PDF::Charts::StdDev::Marker.new do |marker|
  marker.style = PDF::Writer::StrokeStyle.new(5)
  marker.color = Color::RGB::Grey70
end
chart.lower_crossbar = PDF::Charts::StdDev::Marker.new do |marker|
  marker.style = PDF::Writer::StrokeStyle.new(10)
  marker.color = Color::RGB::BlueViolet
end

chart.data << PDF::Charts::StdDev::DataPoint.new(1, 4.0000, 0.5774)
chart.render_on pdf

pdf.save_as("2008043002.pdf")

「4<#lower_crossbar, #bar=>」は「4<#lower_crossbar, #lower_crossbar=>」の間違いのようだ。