# Showcase

The full XWUIBarcodeEAN13 range on one screen: 12-digit codes with a derived check digit next to explicit 13-digit codes, what the leading prefix digit does to the left-half parity, bar geometry (module width, height, quiet zone), and every knob on the human-readable digit line.

It closes with a printable shelf label and a live re-encode driven by `setData()`. Bars stay black on white because scanner contrast is a hard requirement, so the canvas ink is deliberately not themed.