bb4-traffic-simulation

Simulates traffic flow using graphs and sprites (GraphStream + a domain model in roadnet / simulation).

How to run

Use Java 21+ (java --version). With sdkman you can install and switch JDK versions.

./gradlew run

Or run com.barrybecker4.simulations.traffic.TrafficApp from IntelliJ.

The window opens with File → Open traffic map. Example data files live under scala-test/com/barrybecker4/simulations/traffic/data/ (e.g. dumbTrafficMap1.txt).

A second entry point, TrafficDemoApplication, loads a default map and runs the same simulation pipeline (no menu).

Tuning

Simulation timing and physics are centralized in TrafficSimulationConfig:

• deltaTimeSecs — simulation timestep per tick (default 0.02).
• realtimeSpeedFactor — scales wall-clock sleep: sleepMs = (deltaTimeSecs * 1000 * realtimeSpeedFactor).toLong. Default 0.1 matches the older demo (Thread.sleep(2) ms per tick with delta=0.02). Use 0 for no sleep (run as fast as the CPU allows).

Tests

./gradlew test