class ImgToPdf::FitPageDocument
Public Class Methods
create(page_dimension_pt:, margin_pt:, image:, n_horizontal_pages: 1, n_vertical_pages: 1)
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@param [ImgToPdf::Dimension] page_dimension_pt page size. points. @param [ImgToPdf::Margin] margin_pt margin size. points. @param [ImgToPdf::Image] image source image. @param [Integer] n_horizontal_pages number of horizontal pages. @param [Integer] n_vertical_pages number of vertical pages. @return [ImgToPdf::FitPageDocument] document to render PDF.
# File lib/img_to_pdf/fit_page_document.rb, line 12 def self.create(page_dimension_pt:, margin_pt:, image:, n_horizontal_pages: 1, n_vertical_pages: 1) result = new(page_dimension_pt: page_dimension_pt, margin_pt: margin_pt, n_horizontal_pages: n_horizontal_pages, n_vertical_pages: n_vertical_pages, image: image) result.draw return result end
new(page_dimension_pt:, margin_pt:, image:, n_horizontal_pages:, n_vertical_pages:)
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# File lib/img_to_pdf/fit_page_document.rb, line 22 def initialize(page_dimension_pt:, margin_pt:, image:, n_horizontal_pages:, n_vertical_pages:) @page_dimension_pt = page_dimension_pt @margin_pt = margin_pt @image = image @n_horizontal_pages = n_horizontal_pages @n_vertical_pages = n_vertical_pages @pdf = Prawn::Document.new( page_size: @page_dimension_pt.to_a, margin: @margin_pt.to_a, skip_page_creation: true, info: { Creator: "img_to_pdf version #{ImgToPdf::VERSION}", }, ) end
Public Instance Methods
draw()
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# File lib/img_to_pdf/fit_page_document.rb, line 40 def draw canvas_dimension_pt = determine_canvas_dimension_pt canvas_scale = determine_canvas_scale(canvas_dimension_pt) sub_image_dimension_px = ImgToPdf::Dimension.new( width: @image.dimension_px.width / @n_horizontal_pages, height: @image.dimension_px.height / @n_vertical_pages, ) each_sub_image(sub_image_dimension_px) do |sub_image| @pdf.start_new_page @pdf.image( sub_image.path, scale: canvas_scale, at: [0, canvas_dimension_pt.height / @n_vertical_pages], ) end end
render_file(output_path)
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@param [Pathname] output_path path to PDF output.
# File lib/img_to_pdf/fit_page_document.rb, line 58 def render_file(output_path) @pdf.render_file(output_path) end
Private Instance Methods
determine_canvas_dimension_pt()
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# File lib/img_to_pdf/fit_page_document.rb, line 64 def determine_canvas_dimension_pt w = (@page_dimension_pt.width - @margin_pt.left - @margin_pt.right) * @n_horizontal_pages h = (@page_dimension_pt.height - @margin_pt.top - @margin_pt.bottom) * @n_vertical_pages return ImgToPdf::Dimension.new(width: w, height: h) end
determine_canvas_scale(canvas_dimension_pt)
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# File lib/img_to_pdf/fit_page_document.rb, line 72 def determine_canvas_scale(canvas_dimension_pt) canvas_dimension_in = canvas_dimension_pt.pt_to_in dpi_from_width = @image.dimension_px.width / canvas_dimension_in.width dpi_from_height = @image.dimension_px.height / canvas_dimension_in.height canvas_dpi = [dpi_from_width, dpi_from_height].max return 72 / canvas_dpi end
each_sub_image(sub_image_dimension_px) { |sub_image| ... }
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# File lib/img_to_pdf/fit_page_document.rb, line 80 def each_sub_image(sub_image_dimension_px) @n_vertical_pages.times do |i_y| @n_horizontal_pages.times do |i_x| @image.crop(sub_image_dimension_px.width * i_x, sub_image_dimension_px.height * i_y, sub_image_dimension_px.width, sub_image_dimension_px.height) do |sub_image| yield(sub_image) end end end end