CurveMovement.cpp

#include "CurveMovement.h"


// Sets default values for this component's properties
UCurveMovement::UCurveMovement()
{
	// Set this component to be initialized when the game starts, and to be ticked every frame.  You can turn these features
	// off to improve performance if you don't need them.
	PrimaryComponentTick.bCanEverTick = true;
	ElapsedTime = 0;
	// ...
}


// Called when the game starts
void UCurveMovement::BeginPlay()
{
	Super::BeginPlay();

	// ...
	
}


// Called every frame
void UCurveMovement::TickComponent(float DeltaTime, ELevelTick TickType, FActorComponentTickFunction* ThisTickFunction)
{
	Super::TickComponent(DeltaTime, TickType, ThisTickFunction);

	//update time
	ElapsedTime += DeltaTime * Velocity;

	//check finish curve
	float min = 0;
	float max = 0;
	Curve->GetTimeRange(min,max);
	if (LoopCurve)
	{
		if (ElapsedTime > max)
			ElapsedTime = 0;
	}
	
	// get float value
	const FVector CurveValue = Curve->GetVectorValue(ElapsedTime);

	//move actor
	GetOwner()->SetActorLocation(CurveValue);
}

CurveMovement.h

#pragma once

#include "CoreMinimal.h"
#include "Components/ActorComponent.h"
#include "Runtime/Engine/Classes/Curves/CurveVector.h"
#include "Runtime/Engine/Classes/GameFramework/Actor.h"
#include "CurveMovement.generated.h"


UCLASS(ClassGroup = (Custom), meta = (BlueprintSpawnableComponent))
class EXERCISE20180208_API UCurveMovement : public UActorComponent
{
	GENERATED_BODY()

public:
	// Sets default values for this component's properties
	UCurveMovement();
	// Called every frame
	virtual void TickComponent(float DeltaTime, ELevelTick TickType, FActorComponentTickFunction* ThisTickFunction) override;


	UPROPERTY(EditAnywhere)
		UCurveVector* Curve;

	UPROPERTY(EditAnywhere)
		bool LoopCurve;

	UPROPERTY(EditAnywhere)
		float Velocity = 1;

protected:
	// Called when the game starts
	virtual void BeginPlay() override;

private:
	float ElapsedTime;

};