Switch from UPC to QR in balloon printout #1140
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Switch from custom UPCa drawing code to using a QR code library. QR code scanners aren't significantly more expensive than barcode scanners now, it uses less space (so will conflict with messages less on the printout), has built-in error correction, and we can use 'icpc-balloon-X' instead of just a number. I've used the qrcodegen library. The 1.8 release is a little stale, but the github repo still has activity and it's not like QR codes have changed a lot lately (and my UPC code was older). I'm putting the library in the model project instead of balloon util so that it can be reused by other tools (like snakeyaml or sentry).
nickygerritsen
approved these changes
Jul 2, 2025
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Switch from custom UPCa drawing code to using a QR code library. QR code scanners aren't significantly more expensive than barcode scanners now, it uses less space (so will conflict with messages less on the printout), has built-in error correction, and we can use 'icpc-balloon-X' instead of just a number.
I've used the qrcodegen library. The 1.8 release is a little stale, but the github repo still has activity and it's not like QR codes have changed a lot lately (and my UPC code was older). I'm putting the library in the model project instead of balloon util so that it can be reused by other tools (like snakeyaml or sentry).