Class: LiquidXlsx::DrawingBuilder

Inherits:
Object
  • Object
show all
Defined in:
lib/liquid_xlsx/drawing_builder.rb

Overview

Builds OpenXML drawing parts (drawingN.xml and relationships) from collected image operations for a single worksheet.

Constant Summary collapse

XDR_NS = 
"http://schemas.openxmlformats.org/drawingml/2006/spreadsheetDrawing"
A_NS = 
"http://schemas.openxmlformats.org/drawingml/2006/main"
R_NS = 
"http://schemas.openxmlformats.org/officeDocument/2006/relationships"

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(sheet_ops, images_options = {}, merge_refs = []) ⇒ DrawingBuilder

Returns a new instance of DrawingBuilder.

Parameters:

  • sheet_ops (Array<Hash>) —

    image operations for one sheet

  • images_options (Hash) (defaults to: {}) —

    { loader:, default_dpi: }

  • merge_refs (Array<String>) (defaults to: []) —

    e.g. ["A1:C2", "D5:D6"] from rendered sheet



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# File 'lib/liquid_xlsx/drawing_builder.rb', line 30

def initialize(sheet_ops, images_options = {}, merge_refs = [])
  @ops = sheet_ops
  @dpi = images_options.fetch(:default_dpi, 96)
  @loader = images_options[:loader]
  @merge_refs = merge_refs
  @next_r_id = 1
  @seen_sha = {}
end

Class Method Details

.col_to_index(col) ⇒ Object 



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# File 'lib/liquid_xlsx/drawing_builder.rb', line 17

def self.col_to_index(col)
  col.to_s.upcase.each_char.reduce(0) do |acc, ch|
    (acc * 26) + (ch.ord - "A".ord + 1)
  end - 1
end

.px_to_emu(px, dpi = 96) ⇒ Object 



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# File 'lib/liquid_xlsx/drawing_builder.rb', line 13

def self.px_to_emu(px, dpi = 96)
  ((px.to_f / dpi) * 914_400).round
end

.row_to_zero(row) ⇒ Object 



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# File 'lib/liquid_xlsx/drawing_builder.rb', line 23

def self.row_to_zero(row)
  row.to_i - 1
end

Instance Method Details

#build ⇒ Object 



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# File 'lib/liquid_xlsx/drawing_builder.rb', line 39

def build
  images = @ops.map { |op| coerce_image(op) }
  return empty_result if images.all?(&:nil?)

  anchors = []
  media_items = []
  anchor_idx = 0

  images.each_with_index do |img, op_idx|
    next if img.nil?

    anchor_idx += 1

    sha = img.sha256
    unless @seen_sha.key?(sha)
      @seen_sha[sha] = @next_r_id
      media_items << { sha: sha, binary: img.binary, ext: img.extension }
      @next_r_id += 1
    end

    op = @ops[op_idx]
    anchor = build_anchor(img, anchor_idx, @seen_sha[sha], op)
    anchors << anchor
  end

  drawing_xml = build_drawing_xml(anchors)
  drawing_rels_xml = build_rels_xml(media_items)

  { drawing_xml: drawing_xml, drawing_rels_xml: drawing_rels_xml, media_items: media_items }
end