Sha256: 710d7e9f3b7a7178339273d5b10a1342532ecc1102ece58599f826381aaf542d
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Contents
require 'barby/outputter'
require 'png'
module Barby
#Renders the barcode to a PNG image using the "png" gem (gem install png)
#
#Registers the to_png and to_canvas methods
class PngOutputter < Outputter
register :to_png, :to_canvas
attr_accessor :xdim, :ydim, :width, :height, :margin
#Creates a PNG::Canvas object and renders the barcode on it
def to_canvas(opts={})
with_options opts do
canvas = PNG::Canvas.new(full_width, full_height, PNG::Color::White)
if barcode.two_dimensional?
x, y = margin, margin
booleans.reverse_each do |line|
line.each do |bar|
if bar
x.upto(x+(xdim-1)) do |xx|
y.upto y+(ydim-1) do |yy|
canvas[xx,yy] = PNG::Color::Black
end
end
end
x += xdim
end
y += ydim
x = margin
end
else
x, y = margin, margin
booleans.each do |bar|
if bar
x.upto(x+(xdim-1)) do |xx|
y.upto y+(height-1) do |yy|
canvas[xx,yy] = PNG::Color::Black
end
end
end
x += xdim
end
end
canvas
end
end
#Renders the barcode to a PNG image
def to_png(*a)
PNG.new(to_canvas(*a)).to_blob
end
def width
length * xdim
end
def height
barcode.two_dimensional? ? (ydim * encoding.length) : (@height || 100)
end
def full_width
width + (margin * 2)
end
def full_height
height + (margin * 2)
end
def xdim
@xdim || 1
end
def ydim
@ydim || xdim
end
def margin
@margin || 10
end
def length
barcode.two_dimensional? ? encoding.first.length : encoding.length
end
end
end
Version data entries
9 entries across 9 versions & 2 rubygems