Class: Idml::TextEngine::VerticalLayout

Inherits:
Object
  • Object
show all
Defined in:
lib/idml/text_engine/vertical_layout.rb

Overview

Positions justified lines vertically within a text frame. Applies leading, paragraph spacing, first-line indent, and left/right insets.

Defined Under Namespace

Classes: Frame

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(frame, font_size, leading, space_before, space_after, first_line_indent, left_indent) ⇒ VerticalLayout

Returns a new instance of VerticalLayout.



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# File 'lib/idml/text_engine/vertical_layout.rb', line 23

def initialize(frame, font_size, leading, space_before,
               space_after, first_line_indent, left_indent)
  @frame = frame
  @font_size = font_size
  @leading = leading || (font_size * 1.2)
  @space_before = space_before
  @space_after = space_after
  @first_line_indent = first_line_indent
  @left_indent = left_indent
end

Class Method Details

.layout(lines:, frame:, font_size:, leading: nil, space_before: 0, space_after: 0, first_line_indent: 0, left_indent: 0) ⇒ Object 



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# File 'lib/idml/text_engine/vertical_layout.rb', line 16

def self.layout(lines:, frame:, font_size:,
                leading: nil, space_before: 0, space_after: 0,
                first_line_indent: 0, left_indent: 0)
  new(frame, font_size, leading, space_before, space_after,
      first_line_indent, left_indent).layout(lines)
end

Instance Method Details

#layout(lines) ⇒ Object 



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# File 'lib/idml/text_engine/vertical_layout.rb', line 34

def layout(lines)
  result = []
  y = top_y - @space_before
  lines.each_with_index do |line, idx|
    y -= @leading
    x = frame_left + (idx.zero? ? @first_line_indent : @left_indent)
    x += line.x_offset.to_f
    current_x = x
    line.glyphs.each do |glyph|
      result << PositionedGlyph.new(glyph.codepoint,
                                    current_x,
                                    y,
                                    @font_size)
      current_x += glyph.width
    end
  end
  result
end