82 lines
3.0 KiB
C#
82 lines
3.0 KiB
C#
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using UnityEngine;
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using System.Collections.Generic;
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using BehaviorDesigner.Runtime.Tasks;
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using Tooltip = BehaviorDesigner.Runtime.Tasks.TooltipAttribute;
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using HelpURL = BehaviorDesigner.Runtime.Tasks.HelpURLAttribute;
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namespace BehaviorDesigner.Runtime.Formations.Tasks
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{
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[TaskCategory("Formations")]
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[TaskDescription("Arrange the group in a tight circle that can move together.")]
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[TaskIcon("Assets/Behavior Designer Formations/Editor/Icons/{SkinColor}SwarmIcon.png")]
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[HelpURL("https://www.opsive.com/support/documentation/behavior-designer-formations-pack/")]
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public class Swarm : NavMeshFormationGroup
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{
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[Tooltip("The radius of the group")]
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public SharedFloat radius = 5;
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[Tooltip("The agent positions in the swarm is randomly determined. These positions will keep being regenerated until they are not overlapping any other position. " +
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"This value allows the random placement to be capped so it doesn't result in an infinite loop")]
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public SharedInt maxPlacementAttempts = 10;
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private List<Vector3> offsets = new List<Vector3>();
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protected override void AddAgentToGroup(Behavior agent, int index)
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{
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base.AddAgentToGroup(agent, index);
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// Prevent the agents from overlapping by generating a new offset until there are no overlaps. The maxAttempts value will prevent an infinite loop
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// from being generated if there are no non-overlap positions because the radius is too small.
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var overlapping = false;
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var offset = Random.insideUnitCircle * radius.Value;
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var maxAttempts = offsets.Count * maxPlacementAttempts.Value;
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var attempts = 0;
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do {
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for (int i = 0; i < offsets.Count; ++i) {
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if (Vector2.Distance(offset, offsets[i]) < radius.Value) {
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overlapping = true;
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}
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}
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attempts++;
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} while (overlapping && attempts < maxAttempts);
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offsets.Add(new Vector3(offset.x, 0, offset.y));
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}
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protected override int RemoveAgentFromGroup(Behavior agent)
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{
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var index = base.RemoveAgentFromGroup(agent);
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if (index != -1) {
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offsets.RemoveAt(index);
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}
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return index;
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}
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protected override Vector3 TargetPosition(int index, float zLookAhead)
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{
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if (offsets.Count <= index) {
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return Vector3.zero;
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}
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var leaderTransform = leader.Value == null ? transform : leader.Value.transform;
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return leaderTransform.TransformPoint(offsets[index].x, 0, offsets[index].z + zLookAhead);
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}
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public override void OnEnd()
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{
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base.OnEnd();
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offsets.Clear();
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}
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public override void OnReset()
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{
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base.OnReset();
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radius = 5;
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maxPlacementAttempts = 10;
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}
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}
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}
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