ruby-on-rails - Rubyonrails - 使用 prawn.how 将表格对齐到 pdf 中的中心生成 Pdf

Question

在 ruby​​ on rails 应用程序中，我使用 prawn(o.12.0) 和 prawnto 创建了 pdf。在 pdf 中有一个表格，问题是我无法将表格对齐到中心。

当我给 :align =>center 时，它会抛出一个未定义的错误。

我该如何解决这个问题。

pdf.bounding_box([5, 705], :width => 530, :height => 680) do
pdf.stroke_bounds

pdf.move_down(20) 
pdf.text "Demographics", :size => 15, :style => :bold, :align => :center


invoiceData = [["Facebook Pushes - Total users","Users Shared Exercise For   Week","Users Shared Exercise For Day","Users Share TestResult"],
[100","20","50","30"]]

pdf.table(invoiceData,:row_colors => ["FDFFFF", "FFFFFF"], :cell_style => { :border_width => 0.1,:border_color=> 'C1C1C1' }) do |table|

end

pdf.bounding_box([pdf.bounds.right - 50,pdf.bounds.bottom], :width => 60, :height => 20) do
pagecount = pdf.page_count
pdf.text "Page #{pagecount}"
end
  end

[截屏]

http://i.stack.imgur.com/pqBtA.png

Answer 1

    pdf.bounding_box([5, 705], :width => 530, :height => 680) do
pdf.stroke_bounds

pdf.move_down(20) 
pdf.text "Demographics", :size => 15, :style => :bold, :align => :center

pdf.bounding_box([25,pdf.bounds.top-100], :width => 516, :height => 680) do
invoiceData = [["Facebook Pushes - Total users","Users Shared Exercise For   Week","Users Shared Exercise For Day","Users Share TestResult"],
[100","20","50","30"]]

pdf.table(invoiceData,:row_colors => ["FDFFFF", "FFFFFF"], :cell_style => { :border_width => 0.1,:border_color=> 'C1C1C1' }) do |table|
end
end

pdf.bounding_box([pdf.bounds.right - 50,pdf.bounds.bottom], :width => 60, :height => 20) do
pagecount = pdf.page_count
pdf.text "Page #{pagecount}"
end
  end

通过像这样在表格上方定义一个新的边界框，我们可以解决这个问题

pdf.bounding_box([25,pdf.bounds.top-100], :width => 516, :height => 680) do