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Add Delay node to BT

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This commit is contained in:
Wojtek Figat
2023-08-20 21:42:43 +02:00
parent 2e9facc429
commit fce82247ab
2 changed files with 57 additions and 0 deletions
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22
Source/Engine/AI/BehaviorTreeNodes.cpp
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@@ -1,7 +1,9 @@
// Copyright (c) 2012-2023 Wojciech Figat. All rights reserved.
#include "BehaviorTreeNodes.h"
#include "Behavior.h"
#include "BehaviorKnowledge.h"
#include "Engine/Core/Random.h"
#include "Engine/Serialization/Serialization.h"
BehaviorUpdateResult BehaviorTreeNode::InvokeUpdate(const BehaviorUpdateContext& context)
@@ -96,3 +98,23 @@ BehaviorUpdateResult BehaviorTreeSequenceNode::Update(BehaviorUpdateContext cont
return result;
}
int32 BehaviorTreeDelayNode::GetStateSize() const
{
return sizeof(State);
}
void BehaviorTreeDelayNode::InitState(Behavior* behavior, void* memory)
{
auto state = GetState<State>(memory);
if (!WaitTimeSelector.TryGet(behavior->GetKnowledge(), state->TimeLeft))
state->TimeLeft = WaitTime;
state->TimeLeft = Random::RandRange(Math::Max(WaitTime - RandomDeviation, 0.0f), WaitTime + RandomDeviation);
}
BehaviorUpdateResult BehaviorTreeDelayNode::Update(BehaviorUpdateContext context)
{
auto state = GetState<State>(context.Memory);
state->TimeLeft -= context.DeltaTime;
return state->TimeLeft <= 0.0f ? BehaviorUpdateResult::Success : BehaviorUpdateResult::Running;
}

35
Source/Engine/AI/BehaviorTreeNodes.h
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@@ -2,7 +2,9 @@
#pragma once
#include "BehaviorKnowledge.h"
#include "BehaviorTreeNode.h"
#include "BehaviorKnowledgeSelector.h"
#include "Engine/Core/Collections/Array.h"
/// <summary>
@@ -59,3 +61,36 @@ API_CLASS(Sealed) class FLAXENGINE_API BehaviorTreeRootNode : public BehaviorTre
API_FIELD(Attributes="EditorOrder(10)")
float UpdateFPS = 10.0f;
};
/// <summary>
/// Delay node that waits a specific amount of time while executed.
/// </summary>
API_CLASS(Sealed) class FLAXENGINE_API BehaviorTreeDelayNode : public BehaviorTreeNode
{
DECLARE_SCRIPTING_TYPE_WITH_CONSTRUCTOR_IMPL(BehaviorTreeDelayNode, BehaviorTreeNode);
API_AUTO_SERIALIZATION();
// Time in seconds to wait when node gets activated. Unused if WaitTimeSelector is used.
API_FIELD(Attributes="EditorOrder(10), Limit(0)")
float WaitTime = 3.0f;
// Wait time randomization range to deviate original value.
API_FIELD(Attributes="EditorOrder(20), Limit(0)")
float RandomDeviation = 0.0f;
// Wait time from behavior's knowledge (blackboard, goal or sensor). If set, overrides WaitTime but still uses RandomDeviation.
API_FIELD(Attributes="EditorOrder(30)")
BehaviorKnowledgeSelector<float> WaitTimeSelector;
public:
// [BehaviorTreeNode]
int32 GetStateSize() const override;
void InitState(Behavior* behavior, void* memory) override;
BehaviorUpdateResult Update(BehaviorUpdateContext context) override;
private:
struct State
{
float TimeLeft;
};
};