Class: Fontisan::Commands::VariableCommand

Inherits:
BaseCommand
  • Object
show all
Defined in:
lib/fontisan/commands/variable_command.rb

Overview

Command to extract variable font information.

This command extracts variation axes and named instances from variable fonts using the fvar (Font Variations) table.

Examples:

Extract variable font information

command = VariableCommand.new("path/to/variable-font.ttf")
info = command.run
puts info.axes.first.tag

Instance Method Summary collapse

Methods inherited from BaseCommand

#initialize

Constructor Details

This class inherits a constructor from Fontisan::Commands::BaseCommand

Instance Method Details

#run ⇒ Models::VariableFontInfo

Extract variable font information from the fvar table.

Returns:



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# File 'lib/fontisan/commands/variable_command.rb', line 18

def run
  result = Models::VariableFontInfo.new

  # Check if font has fvar table
  unless font.has_table?(Constants::FVAR_TAG)
    result.is_variable = false
    result.axis_count = 0
    result.instance_count = 0
    result.axes = []
    result.instances = []
    return result
  end

  fvar_table = font.table(Constants::FVAR_TAG)
  name_table = font.table(Constants::NAME_TAG) if font.has_table?(Constants::NAME_TAG)

  result.is_variable = true
  result.axis_count = fvar_table.axis_count
  result.instance_count = fvar_table.instance_count

  # Extract axes information
  result.axes = fvar_table.axes.map do |axis|
    Models::AxisInfo.new(
      tag: axis.axis_tag,
      name: name_table&.english_name(axis.axis_name_id),
      min_value: axis.min_value,
      default_value: axis.default_value,
      max_value: axis.max_value,
    )
  end

  # Extract instances information
  result.instances = fvar_table.instances.map do |instance|
    Models::InstanceInfo.new(
      name: name_table&.english_name(instance[:name_id]),
      coordinates: instance[:coordinates],
    )
  end

  result
end