Class: Emfsvg::Translation::Handlers::PathFlattener

Inherits:
Object
  • Object
show all
Defined in:
lib/emfsvg/translation/handlers/path_flattener.rb

Overview

Flatten a list of Svg::PathData::Command into a single shape (Polyline/Polygon/PolyBezier) suitable for one EMF record.

v1 limitations:

* All commands converted to absolute (relative resolved).
* Arc/quadratic commands approximated as lines (TODO).
* Multiple subpaths merged into one (TODO: PolyPolygon).

Defined Under Namespace

Classes: Bounds, Result

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.flatten(commands) ⇒ Object 



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# File 'lib/emfsvg/translation/handlers/path_flattener.rb', line 16

def self.flatten(commands)
  new.flatten(commands)
end

Instance Method Details

#flatten(commands) ⇒ Object 



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# File 'lib/emfsvg/translation/handlers/path_flattener.rb', line 20

def flatten(commands)
  pen = PenState.new
  closed = false
  has_curve = false
  points = []

  commands.each do |command|
    case command.letter.upcase
    when "M"
      pen.move_to(command, absolute: command.absolute?)
      points << pen.current.dup
    when "L"
      pen.line_to(command, absolute: command.absolute?)
      points << pen.current.dup
    when "H"
      pen.h_line_to(command, absolute: command.absolute?)
      points << pen.current.dup
    when "V"
      pen.v_line_to(command, absolute: command.absolute?)
      points << pen.current.dup
    when "C"
      has_curve = true
      pen.cubic_to(command, absolute: command.absolute?)
      points.concat(pen.flush_curve_points)
    when "Z"
      closed = true
    end
  end

  Result.new(
    shape_kind: shape_kind(closed, has_curve),
    points: points,
    bounds: bounds_for(points)
  )
end