# [MATL], 23 bytes

    tt&n:qt&+&y\tb+&y\b*+Q(

The `(0,0)` point is upper left, as in the examples in the challenge text.

[Try it online!]

[MATL]: https://github.com/lmendo/MATL
[Try it online!]: https://tio.run/nexus/matl#@19SopZnVViipq1WGVOSBCKTtLQDNf7/jzbUMdIx1jGxVjDVMdMx17GwVrDUMTTQMTTUMTSyVjA01jE00TE01TE0iwUA "MATL – TIO Nexus"