Barcode.Ruby — Easy 2 Steps

# Step 1: Create barcode
qr = BarcodePao::QRCode.new("png")
# Step 2: Draw!
qr.draw(code, 300)
base64 = qr.get_image_base64

# Step 1: Create barcode (SVG mode)
qr = BarcodePao::QRCode.new("svg")
# Step 2: Draw!
qr.draw(code, 300)
svg = qr.get_svg

# Prawn PDF with barcode image
require "prawn"

qr = BarcodePao::QRCode.new("png")
qr.draw(code, 200)
bytes = qr.get_image_memory

pdf = Prawn::Document.new
pdf.image StringIO.new(bytes), width: 200
pdf.render_file("output.pdf")

# ChunkyPNG canvas + barcode compositing
require "chunky_png"

canvas = ChunkyPNG::Image.new(900, 520)
# ... draw background ...
qr = BarcodePao::QRCode.new("png")
qr.draw(code, 220)
qr_img = ChunkyPNG::Image.from_blob(qr.get_image_memory)
canvas.compose!(qr_img, x, y)