using UnityEngine;
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using UnityEngine.AI;
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namespace TowerDefense.Agents
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{
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/// <summary>
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/// Agent that can pass "over" towers that block the path
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/// </summary>
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public class FlyingAgent : Agent
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{
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/// <summary>
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/// Time to wait to clear the navmesh obstacles
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/// </summary>
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protected float m_WaitTime = 0.5f;
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/// <summary>
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/// The current time to wait until we can resume agent movement as normal
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/// </summary>
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protected float m_CurrentWaitTime;
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/// <summary>
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/// If flying agents are blocked, they should still move through obstacles
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/// </summary>
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protected override void OnPartialPathUpdate()
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{
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if (!isPathBlocked)
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{
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state = State.OnCompletePath;
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return;
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}
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if (!isAtDestination)
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{
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return;
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}
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m_NavMeshAgent.enabled = false;
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m_CurrentWaitTime = m_WaitTime;
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state = State.PushingThrough;
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}
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/// <summary>
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/// Controls behaviour based on the states <see cref="Agent.State.OnCompletePath"/>, <see cref="Agent.State.OnPartialPath"/>
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/// and <see cref="Agent.State.PushingThrough"/>
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/// </summary>
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protected override void PathUpdate()
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{
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switch (state)
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{
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case State.OnCompletePath:
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OnCompletePathUpdate();
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break;
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case State.OnPartialPath:
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OnPartialPathUpdate();
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break;
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case State.PushingThrough:
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PushingThrough();
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break;
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}
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}
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/// <summary>
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/// When flying agents are pushing through, give them a small amount of time to clear the gap and turn on their agent
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/// once time elapses
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/// </summary>
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protected void PushingThrough()
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{
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m_CurrentWaitTime -= Time.deltaTime;
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// Move the agent, overriding its NavMeshAgent until it reaches its destination
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transform.LookAt(m_Destination.transform, Vector3.up);
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transform.position += transform.forward * m_NavMeshAgent.speed * Time.deltaTime;
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if (m_CurrentWaitTime > 0)
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{
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return;
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}
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// Check if there is a navmesh under the agent, if not, then reset the timer
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NavMeshHit hit;
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if (!NavMesh.Raycast(transform.position + Vector3.up, Vector3.down, out hit, navMeshMask))
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{
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m_CurrentWaitTime = m_WaitTime;
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}
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else
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{
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// If the time elapses, and there is a NavMesh under it, resume agent movement as normal
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m_NavMeshAgent.enabled = true;
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NavigateTo(m_Destination.transform.position);
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state = isPathBlocked ? State.OnPartialPath : State.OnCompletePath;
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}
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}
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}
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}
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