Class: AFM::Font

### Home Classes Methods

### In Files

- lib/afm.rb

### Parent

Object

### Methods

- ::from_file
- ::new
- #[]
- #metrics_for

### Files

- LICENSE
- README.rdoc

### Class/Module Index

Quicksearch

- AFM
- AFM::Font

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# AFM::Font

### Attributes

char_metrics[R]
char_metrics_by_code[R]
kern_pairs[R]
metadata[R]

### Public Class Methods

from_file(file) click to toggle source

alias for new()

    # File lib/afm.rb, line 82
    def self.from_file(file)
      self.new(file)
    end

new(filename) click to toggle source

Loading a Font Metrics file by absolute path (no automatic font path resolution)

    # File lib/afm.rb, line 38
    def initialize(filename)
      @metadata = {}
      @char_metrics = {}
      @char_metrics_by_code = {}
      @kern_pairs = []
      File.open(filename) do |file|
        mode = :meta
        file.each_line do |line|
          case(line)
          when /^StartFontMetrics/ ; mode = :meta
          when /^StartCharMetrics/ ; mode = :char_metrics
          when /^EndCharMetrics/ ; mode = :meta
          when /^StartKernData/ ; mode = :kern_data
          when /^StartKernPairs/ ; mode = :kern_pairs
          when /^EndKernPairs/ ; mode = :kern_data
          when /^EndKernData/ ; mode = :meta
          else
            case(mode)
            when :meta
              if match = line.match(/^([\w]+) (.*)$/)
                @metadata[match[1]] = match[2]
              end
            when :char_metrics
              metrics = {}
              metrics[:charcode] = match[1].to_i if match = line.match(/C (-?\d+) *?;/)
              metrics[:wx] = match[1].to_i if match = line.match(/WX (-?\d+) *?;/)
              metrics[:name] = match[1] if match = line.match(/N ([.\w]+) *?;/)
              if match = line.match(/B (-?\d+) (-?\d+) (-?\d+) (-?\d+) *?;/)
                metrics[:boundingbox] = [match[1].to_i, match[2].to_i, match[3].to_i, match[4].to_i]
              end
              @char_metrics[metrics[:name]] = metrics if metrics[:name]
              @char_metrics_by_code[metrics[:charcode]] = metrics if metrics[:charcode] && metrics[:charcode] > 0
            when :kern_pairs
              if match = line.match(/^KPX ([.\w]+) ([.\w]+) (-?\d+)$/)
                @kern_pairs << [match[1], match[2], match[3].to_i]
              end
            end
          end
        end
      end
    end

### Public Instance Methods

[](key) click to toggle source

Get metadata by key

    # File lib/afm.rb, line 88
    def [](key)
      @metadata[key]
    end

metrics_for(char) click to toggle source

Get metrics for character. Takes an integer (charcode) or a one-char string. currently works only for Latin1 strings, since we only have a chartable for the Latin1 charset so far. (shamelessly stolen from AFM.pm by Gisle Aas)

    # File lib/afm.rb, line 96
    def metrics_for(char)
      glyph = if (char.kind_of?(Integer))
        ISO_LATIN1_ENCODING[char]
      else
        ISO_LATIN1_ENCODING[char.unpack("C*").first]
      end
      @char_metrics[glyph]
    end

[Validate]

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