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References

https://github.com/libgdx/gdx-ai/wiki/Steering-Behaviors https://andrewfray.wordpress.com/2013/03/26/context-behaviours-know-how-to-share/

Closest point algorithms for various path geometries: Schneider and Eberly [2003].

Vector directions

[20, 0] To East [-20, 0] To West [0, -20] To North [0, 20] To South

Unit circle, degrees

    90
    |
    |

180 ----+---- 0 | | 270

Unit circle, radians

  0.5PI
    |
    |

PI -----+---- 0, 2PI | | 1.5PI

Orientations

Positive increments are clockwise Negative increments are anticlockwise

Orientation Points towards Value
-2 * Math.PI East -6.28
-1.75 * Math.PI South East -5.4
-1.5 * Math.PI South -4.7
-1.25 * Math.PI South West -3.9
-1 * Math.PI West -3.14
-0.75 * Math.PI North West -2
-0.5 * Math.PI North -1.6
-0.25 * Math.PI North East -0.8
0 East 0
0.25 * Math.PI South East 0.7
0.5 * Math.PI South 1.5
0.75 * Math.PI South West 2.3
1 * Math.PI West 3.14
1.25 * Math.PI North West 3.9
1.5 * Math.PI North 4.7
1.75 * Math.PI North East 5.4
2 * Math.PI East 6.2

Behaviours

Angular

Align

  • Field: Max. Rotation
  • Field: Deceleration tolerance
  • Field: Align tolerance
  • Field: Time to Target
  • [Target]

Face

  • Dep: Align
  • Field: Max. Rotation
  • Field: Deceleration tolerance
  • Field: Align tolerance
  • Field: Time to Target
  • [Target]

LookWhereYouAreGoing

  • Dep: Align
  • Field: Max. Rotation
  • Field: Deceleration tolerance
  • Field: Align tolerance
  • Field: Time to Target
  • [Target]

Linear

Arrive

  • Field: Target Radius
  • Field: Slow Radius
  • Field: Time to Target
  • [Target]

CollisionAvoidance

  • Field: Radius

Evade

  • Dep: Flee
  • Field: Max Prediction
  • [Target]

Flee

  • [Target]

FollowPathChaseRabbit

  • Dep: Seek
  • Field: Path offset
  • [Path]

FollowPathPredict

  • Dep: Seek
  • Field: Path offset
  • Field: Predict time
  • [Path]

MatchVelocity

  • Field: Time to Target
  • [Target]

ObstacleAvoidance

  • Field: Avoid Distance
  • Dep: Seek

Pursue

  • Dep: Seek
  • Field: Max. prediction
  • [Target]

Seek

  • [Target]

Separation

  • Field: Threshold
  • Field: Decay coefficient

Wander

  • Field: Offset
  • Field: Radius
  • Field: Rate