PhysicsSpringComponent.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
 
#pragma once
 
#include "CoreMinimal.h"
#include "UObject/ObjectMacros.h"
#include "Components/SceneComponent.h"
#include "PhysicsSpringComponent.generated.h"
 
class UPrimitiveComponent;
 
UCLASS(hidecategories=(Object, Mobility, LOD), ClassGroup=Physics, showcategories=Trigger, MinimalAPI)
class UPhysicsSpringComponent : public USceneComponent
{
    GENERATED_UCLASS_BODY()
 
    
    UPROPERTY(BlueprintReadWrite, EditAnywhere, Category = Physics)
    float SpringStiffness;
 
    UPROPERTY(BlueprintReadWrite, EditAnywhere, Category = Physics)
    float SpringDamping;
 
    UPROPERTY(BlueprintReadWrite, EditAnywhere, Category = Physics, meta = (UIMin = 0.01, ClampMin = 0.01))
    float SpringLengthAtRest;
 
    UPROPERTY(BlueprintReadWrite, EditAnywhere, Category = Physics, meta = (UIMin = 0.01, ClampMin = 0.01))
    float SpringRadius;
 
    UPROPERTY(BlueprintReadWrite, Category = Physics)
    TEnumAsByte<enum ECollisionChannel> SpringChannel;
 
    UPROPERTY(BlueprintReadWrite, EditAnywhere, Category = Physics, meta = (UIMin = 0.01, ClampMin = 0.01))
    bool bIgnoreSelf;
 
    UPROPERTY(BlueprintReadOnly, Category = Physics, transient)
    float SpringCompression;
 
    //~ Begin UActorComponent Interface
    ENGINE_API virtual void TickComponent(float DeltaTime, enum ELevelTick TickType, FActorComponentTickFunction *ThisTickFunction) override;
    //~ End UActorComponent Interface
 
    UFUNCTION(BlueprintCallable, Category = Physics)
    ENGINE_API float GetNormalizedCompressionScalar() const;
 
    UFUNCTION(BlueprintCallable, Category = Physics)
    ENGINE_API FVector GetSpringRestingPoint() const;
 
    UFUNCTION(BlueprintCallable, Category = Physics)
    ENGINE_API FVector GetSpringCurrentEndPoint() const;
 
    UFUNCTION(BlueprintCallable, Category = Physics)
    ENGINE_API FVector GetSpringDirection() const;
 
private:
 
    UPrimitiveComponent* GetSpringCollision(const FVector& Start, const FVector& End, float& CollisionTime) const;
    
    FVector ComputeNewSpringCompressionAndForce(const FVector& End, const float DeltaTime, float& NewSpringCompression) const;
 
    void UpdateAttachedPosition() const;
 
    FVector SpringPositionFromLength(float Length) const;
 
    FVector CurrentEndPoint;
};