First Submit

Source/CogSample/CogSampleFunctionLibrary_Gameplay.cpp

@@ -0,0 +1,24 @@
+#include "CogSampleFunctionLibrary_Gameplay.h"
+
+#include "AbilitySystemComponent.h"
+#include "GameplayEffectTypes.h"
+
+//--------------------------------------------------------------------------------------------------------------------------
+void UCogSampleFunctionLibrary_Gameplay::AdjustAttributeForMaxChange(UAbilitySystemComponent* AbilityComponent, FGameplayAttributeData& AffectedAttribute, float OldValue, float NewMaxValue, const FGameplayAttribute& AffectedAttributeProperty)
+{
+    if (AbilityComponent == nullptr)
+    {
+        return;
+    }
+
+    if (FMath::IsNearlyEqual(OldValue, NewMaxValue))
+    {
+        return;
+    }
+
+    // Change current value to maintain the current Val / Max percent
+    const float CurrentValue = AffectedAttribute.GetCurrentValue();
+    const float NewDelta = (OldValue > 0.f) ? (CurrentValue * NewMaxValue / OldValue) - CurrentValue : NewMaxValue;
+
+    AbilityComponent->ApplyModToAttributeUnsafe(AffectedAttributeProperty, EGameplayModOp::Additive, NewDelta);
+}