给GE添加自定义算法-继承GameplayModMagnitudeCalculation

继承该类

virtual float CalculateBaseMagnitude_Implementation(const FGameplayEffectSpec& Spec) const override;
example：

float UMMC_MaxHealth::CalculateBaseMagnitude_Implementation(const FGameplayEffectSpec& Spec) const
{
    // Gather tags from source and target
    const FGameplayTagContainer* SourceTags = Spec.CapturedSourceTags.GetAggregatedTags();
    const FGameplayTagContainer* TargetTags = Spec.CapturedTargetTags.GetAggregatedTags();

    FAggregatorEvaluateParameters EvaluationParameters;
    EvaluationParameters.SourceTags = SourceTags;
    EvaluationParameters.TargetTags = TargetTags;

    float Vigor = 0.f;
    GetCapturedAttributeMagnitude(VigorDef, Spec, EvaluationParameters, Vigor);
    Vigor = FMath::Max<float>(Vigor, 0.f);

    ICombatInterface* CombatInterface =  Cast<ICombatInterface>(Spec.GetContext().GetSourceObject());
    const int32 PlayerLevel = CombatInterface->GetPlayerLevel();

    return 80.f + 2.5f * Vigor + 10.f * PlayerLevel;
}