A simple actor-based simulation of tag, implemented in rust.
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Adrian Heine 449644ade6 Don't remove previous agent position 10 months ago
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gntag (from German »Guten Tag«: »good day«, roughly equivalent to »g'day«) is an actor-based simulation of tag implemented in rust.


git clone https://git.adrianheine.de/adrian/gntag.git
cd gntag
cargo run

To exit the simulation, press q, ESC or Ctrl+c.


A few tests can be run with:

cargo test


cargo bench runs benchmarks. Their results are available under target/criterion/report/index.html.


  • The world is a simple two-dimensional rectangle with integer positions
  • Agents can occupy the same space
  • Agents can make one move per simulation step, either by trying to move by at most one unit in both directions or by trying to tag another actor
  • Agents need to be at most one unit away in both directions from others in order to tag them
  • Agents act at the same time and their actions are validated against the previous state