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如何更改对虾的字体

prawn pdf ruby-on-rails

Catalin · 技术社区 · 9 年前

我想做的是使用对虾生成PDF,同时使用一些特定于语言的字符。

结果,我得到了以下错误:

raise Prawn::Errors::IncompatibleStringEncoding,
   "Your document includes text that's not compatible with the  Windows-1252 character set.\n" \
   "If you need full UTF-8 support, use TTF fonts instead of PDF's built-in fonts\n."

因此,我尝试通过以下方式更改字体:

# app/models/prawn/change_font_decorator.rb

Prawn::Document.generate("output.pdf") do
  font_families.update("Arial" => {
    :normal => Rails.root.join("app/assets/fonts/OpenSans-Regular.ttf"),
    :italic => Rails.root.join("app/assets/fonts/OpenSans-Regular.ttf"),
    :bold => Rails.root.join("app/assets/fonts/OpenSans-Regular.ttf"),
    :bold_italic => Rails.root.join("app/assets/fonts/OpenSans-Regular.ttf")
  })
  font "Arial"
end

然而,我在尝试生成PDF文件时也遇到了同样的错误。

关于如何解决这个问题有什么想法吗?

4 回复 | 直到 8 年前

BenKoshy Mayinx 6 年前

这个 prawn manual 是一个很好的参考,包括关于字体使用的章节。“外部字体”部分与您的问题特别相关。

下面是一个基本的用例,虽然它不支持粗体和斜体:

Prawn::Document.generate("output.pdf") do
  font Rails.root.join("app/assets/fonts/OpenSans-Regular.ttf")
  text "Euro â¬"
end

要使用粗体和斜体,最好注册一个与标准PDF字体不冲突的字体系列:

Prawn::Document.generate("output.pdf") do
  font_families.update("OpenSans" => {
    :normal => Rails.root.join("app/assets/fonts/OpenSans-Regular.ttf"),
    :italic => Rails.root.join("app/assets/fonts/OpenSans-Regular.ttf"),
    :bold => Rails.root.join("app/assets/fonts/OpenSans-Regular.ttf"),
    :bold_italic => Rails.root.join("app/assets/fonts/OpenSans-Regular.ttf")
  })
  font "OpenSans"
  text "Euro â¬"
end

我应该把上面的代码放在哪里?

如果您继承自 Prawn::Document 您可以尝试以下方法:

class SpreeInvoicePdf < Prawn::Document
  require 'prawn'

  def initialize(quote, line_items)
    self.font_families.update("OpenSans" => {
                                :normal => Rails.root.join("vendor/assets/fonts/Open_Sans/OpenSans-Regular.ttf"),
                                :italic => Rails.root.join("vendor/assets/fonts/Open_Sans/OpenSans-Italic.ttf"),
                                :bold => Rails.root.join("vendor/assets/fonts/Open_Sans/OpenSans-Bold.ttf"),
                                :bold_italic => Rails.root.join("vendor/assets/fonts/Open_Sans/OpenSans-BoldItalic.ttf")
    })

    font "OpenSans"

  # etc.

当然,您需要转到Google字体,下载字体并将其放置在 vendor/assets/fonts/Open_Sans/ 目录

Patrick Jones 8 年前

如果您正在使用initialize构建PDF,您只需在initial方法中更新字体族,然后设置所需的字体。

class InvoicePdf < Prawn::Document

  def initialize()
    super()
    self.font_families.update("DejaVuSans" => {:normal => "#{Rails.root}/public/DejaVuSans.ttf"})
    font "DejaVuSans"
    business_logo
    invoice_items
    footer
  end

  def business_logo
    ##stuff here
  end

end

Abraham 4 年前

如果要更改整个文档中的默认字体,请先清除font_families并添加您的字体。Prawn有自己的一组默认字体,在您使用@doc.font更改字体后,这些默认字体将返回到Prawn。下面的代码清除了Prawn具有的3个字体系列,并只保留默认字体,这将强制它使用真正的“默认”。

Prawn::Document.generate(filename) do |doc|
   doc.font_families.clear
   doc.font_families.update(
     "DejaVuSans" => {
        :bold => Rails.root.join("app/assets/font/DejaVuSans-Bold.ttf"),
        :italic => Rails.root.join("app/assets/font/DejaVuSansOblique.ttf"),
        :normal => Rails.root.join("app/assets/font/DejaVuSans.ttf"),
     }
    )
    # more code
end

-1

AZB 6 年前

我实际上进入了gems文件夹和Prawn/font.rb。

我发现了以下功能:

def font_families
  @font_families ||= Hash.new { |h,k| h[k] = {} }.merge!(
    { "Courier"     => { :bold        => "Courier-Bold",
                         :italic      => "Courier-Oblique",
                         :bold_italic => "Courier-BoldOblique",
                         :normal      => "Courier" },

      "Times-Roman" => { :bold         => "Times-Bold",
                         :italic       => "Times-Italic",
                         :bold_italic  => "Times-BoldItalic",
                         :normal       => "Times-Roman" },

      "Helvetica"   => { :bold         => "Helvetica-Bold",
                         :italic       => "Helvetica-Oblique",
                         :bold_italic  => "Helvetica-BoldOblique",
                         :normal       => "Helvetica" }              
    })
end

我编辑了它以包括Arial:

def font_families
  @font_families ||= Hash.new { |h,k| h[k] = {} }.merge!(
    { "Courier"     => { :bold        => "Courier-Bold",
                         :italic      => "Courier-Oblique",
                         :bold_italic => "Courier-BoldOblique",
                         :normal      => "Courier" },

      "Times-Roman" => { :bold         => "Times-Bold",
                         :italic       => "Times-Italic",
                         :bold_italic  => "Times-BoldItalic",
                         :normal       => "Times-Roman" },

      "Helvetica"   => { :bold         => "Helvetica-Bold",
                         :italic       => "Helvetica-Oblique",
                         :bold_italic  => "Helvetica-BoldOblique",
                         :normal       => "Helvetica" },

            "Arial" => { :normal => "public/fonts/arial.ttf",
                          :italic => "public/fonts/ariali.ttf.ttf",
                          :bold => "public/fonts/arialbd.ttf",
                          :bold_italic => "public/fonts/arialbi.ttf"}              
    })
end

还有维奥拉!成功了!