foodsoft/app/lib/render_pdf.rb

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require 'prawn/measurement_extensions'
class RotatedCell < Prawn::Table::Cell::Text
def initialize(pdf, text, options = {})
options[:content] = text
options[:valign] = :center
options[:align] = :center
options[:rotate_around] = :center
@rotation = -options[:rotate] || 0
super(pdf, [0, pdf.cursor], options)
end
def tan_rotation
Math.tan(Math::PI * @rotation / 180)
end
def skew
(height + (border_top_width / 2.0) + (border_bottom_width / 2.0)) / tan_rotation
end
def styled_width_of(text)
options = @text_options.reject { |k| k == :style }
with_font { (@pdf.height_of(@content, options) + padding_top + padding_bottom) / tan_rotation }
end
def natural_content_height
options = @text_options.reject { |k| k == :style }
with_font { (@pdf.width_of(@content, options) + padding_top + padding_bottom) * tan_rotation }
end
def draw_borders(pt)
@pdf.mask(:line_width, :stroke_color) do
x, y = pt
from = [[x - skew, y + (border_top_width / 2.0)],
to = [x, y - height - (border_bottom_width / 2.0)]]
@pdf.line_width = @border_widths[3]
@pdf.stroke_color = @border_colors[3]
@pdf.stroke_line(from, to)
@pdf.undash
end
end
def draw_content
with_font do
with_text_color do
text_box(width: spanned_content_width + FPTolerance + skew,
height: spanned_content_height + FPTolerance,
at: [1 - skew, @pdf.cursor]).render
end
end
end
end
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class RenderPdf < Prawn::Document
include ActionView::Helpers::NumberHelper
include ApplicationHelper
TOP_MARGIN = 36
BOTTOM_MARGIN = 23
HEADER_SPACE = 9
FOOTER_SPACE = 3
HEADER_FONT_SIZE = 16
FOOTER_FONT_SIZE = 8
DEFAULT_FONT = 'OpenSans'
def initialize(options = {})
options[:font_size] ||= FoodsoftConfig[:pdf_font_size].try(:to_f) || 12
options[:page_size] ||= FoodsoftConfig[:pdf_page_size] || 'A4'
options[:skip_page_creation] = true
@options = options
@first_page = true
super(options)
# Use ttf for better utf-8 compability
font_families.update(
'OpenSans' => {
bold: font_path('OpenSans-Bold.ttf'),
italic: font_path('OpenSans-Italic.ttf'),
bold_italic: font_path('OpenSans-BoldItalic.ttf'),
normal: font_path('OpenSans-Regular.ttf')
}
)
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header = options[:title] || title
footer = I18n.l(Time.now, format: :long)
header_size = 0
header_size = height_of(header, size: HEADER_FONT_SIZE, font: DEFAULT_FONT) + HEADER_SPACE if header
footer_size = height_of(footer, size: FOOTER_FONT_SIZE, font: DEFAULT_FONT) + FOOTER_SPACE
start_new_page(top_margin: TOP_MARGIN + header_size, bottom_margin: BOTTOM_MARGIN + footer_size)
font DEFAULT_FONT
repeat :all, dynamic: true do
bounding_box [bounds.left, bounds.top + header_size], width: bounds.width, height: header_size do
text header, size: HEADER_FONT_SIZE, align: :center, overflow: :shrink_to_fit if header
end
font_size FOOTER_FONT_SIZE do
bounding_box [bounds.left, bounds.bottom - FOOTER_SPACE], width: bounds.width, height: footer_size do
text footer, align: :left, valign: :bottom
end
bounding_box [bounds.left, bounds.bottom - FOOTER_SPACE], width: bounds.width, height: footer_size do
text I18n.t('lib.render_pdf.page', number: page_number, count: page_count), align: :right, valign: :bottom
end
end
end
end
def title
nil
end
def to_pdf
body # Add content, which is defined in subclasses
render # Render pdf
end
# Helper method to test pdf via rails console: OrderByGroups.new(order).save_tmp
def save_tmp
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File.write("#{Rails.root}/tmp/#{self.class.to_s.underscore}.pdf", to_pdf.force_encoding("UTF-8"))
end
# @todo avoid underscore instead of unicode whitespace in pdf :/
def number_to_currency(number, options = {})
super(number, options).gsub("\u202f", ' ') if number
end
def font_size(points = nil, &block)
points *= @options[:font_size] / 12 if points
super(points, &block)
end
# add pagebreak or vertical whitespace, depending on configuration
def down_or_page(space = 10)
if @first_page
@first_page = false
return
end
if pdf_add_page_breaks?
start_new_page
else
move_down space
end
end
protected
def fontsize(n)
n
end
# return whether pagebreak or vertical whitespace is used for breaks
def pdf_add_page_breaks?(docid = nil)
docid ||= self.class.name.underscore
cfg = FoodsoftConfig[:pdf_add_page_breaks]
if cfg.is_a? Array
cfg.index(docid.to_s).any?
elsif cfg.is_a? Hash
cfg[docid.to_s]
else
cfg
end
end
def font_path(name)
File.join(Rails.root, 'vendor', 'assets', 'fonts', name)
end
end