Module: Fontisan::SvgToGlyf::Geometry::TransformParser

Defined in:
lib/fontisan/svg_to_glyf/geometry/transform_parser.rb

Overview

Parses an SVG transform="..." attribute string into a single AffineTransform representing the accumulated composition.

Supports all six SVG transform functions:

translate, scale, rotate, matrix, skewX, skewY

Multiple functions compose left-to-right (leftmost is applied last to the point), matching the SVG specification.

Constant Summary collapse

FUNCTION_RE = 
/(\w+)\s*\(([^)]*)\)/

Class Method Summary collapse

Class Method Details

.parse(transform_string) ⇒ AffineTransform

Parameters:

  • transform_string (String, nil) —

    the SVG transform attribute

Returns:



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# File 'lib/fontisan/svg_to_glyf/geometry/transform_parser.rb', line 19

def self.parse(transform_string)
  return AffineTransform.identity if transform_string.nil? || transform_string.strip.empty?

  transforms = transform_string.scan(FUNCTION_RE).map do |name, args|
    build_transform(name, args)
  end
  transforms.reduce(AffineTransform.identity) { |acc, t| acc.compose(t) }
end