Pattern Movement System

Source file: client/engine/systems/systems_functions/PaternMovementSystem.cpp

Purpose: Apply movement patterns to entities (enemies, special projectiles) according to the configured PatternMovement type.

Components used:

Pattern Movement System

Source file: client/engine/systems/systems_functions/PaternMovementSystem.cpp

Purpose: Apply movement patterns to entities (enemies, special projectiles) according to the configured PatternMovement type.

Components used:

Behavior

• Increments patternMovement.elapsed with dt, then dispatches to the function matching PatternType:
  • Straight: sets vx/vy = baseDir * baseSpeed; kills entity if far outside bounds (x←100/x→2000/y←100/y→1200).
  • SineHorizontal / ZigZagHorizontal: advances in X with base speed and oscillates in Y (continuous sine or sign-based zigzag).
  • SineVertical / ZigZagVertical: advances in Y with base speed and oscillates in X.
  • Wave: combines sine offsets on X and Y added to base velocity.
  • Waypoints: moves toward each waypoint until within waypointThreshold, then cycles.
  • FollowPlayer: finds the nearest player if targetEntityId == -1, then steers toward it; resets if the target vanishes.
  • Circular: writes transform to follow a circle around spawnPos using radius and baseSpeed (elapsed drives the angle).
• Each pattern may kill the entity if it exits extended bounds.

Main signature

void PaternMovementSystem(Eng::registry &reg, const float dt,
    Eng::sparse_array<Com::Transform> &transforms,
    Eng::sparse_array<Com::Velocity> &velocities,
    Eng::sparse_array<Com::PatternMovement> &patern_movements);

Notes