Add building ghost preview

Source/AgrarianGame/AgrarianBuildingPlacementComponent.cpp

@@ -2,13 +2,14 @@
 
 #include "AgrarianBuildingPlacementComponent.h"
 #include "AgrarianInventoryComponent.h"
+#include "DrawDebugHelpers.h"
 #include "GameFramework/Pawn.h"
 #include "GameFramework/Controller.h"
 #include "Engine/World.h"
 
 UAgrarianBuildingPlacementComponent::UAgrarianBuildingPlacementComponent()
 {
-	PrimaryComponentTick.bCanEverTick = false;
+	PrimaryComponentTick.bCanEverTick = true;
 	SetIsReplicatedByDefault(true);
 }
 
@@ -55,6 +56,16 @@ bool UAgrarianBuildingPlacementComponent::GetPlacementPreview(FTransform& OutTra
 	return true;
 }
 
+bool UAgrarianBuildingPlacementComponent::GetPlacementPreviewState(FTransform& OutTransform, FText& FailureReason) const
+{
+	if (!GetPlacementPreview(OutTransform, FailureReason))
+	{
+		return false;
+	}
+
+	return CanPlaceAtTransform(ActiveBuildClass, OutTransform, FailureReason);
+}
+
 bool UAgrarianBuildingPlacementComponent::CanPlaceAtTransform(TSubclassOf<AActor> BuildClass, const FTransform& PlacementTransform, FText& FailureReason) const
 {
 	if (!BuildClass)
@@ -148,6 +159,38 @@ void UAgrarianBuildingPlacementComponent::ServerPlaceBuildable_Implementation(TS
 	OnBuildPlaced.Broadcast(PlacedActor);
 }
 
+void UAgrarianBuildingPlacementComponent::TickComponent(float DeltaTime, ELevelTick TickType, FActorComponentTickFunction* ThisTickFunction)
+{
+	Super::TickComponent(DeltaTime, TickType, ThisTickFunction);
+
+	if (!bShowGhostPreview || !ActiveBuildClass || !GetWorld())
+	{
+		return;
+	}
+
+	FTransform PreviewTransform;
+	FText FailureReason;
+	const bool bCanPlace = GetPlacementPreviewState(PreviewTransform, FailureReason);
+	const FColor PreviewColor = bCanPlace ? ValidGhostPreviewColor : InvalidGhostPreviewColor;
+	const FVector PreviewExtent(
+		FMath::Max(PlacementProbeRadius, 25.0f),
+		FMath::Max(PlacementProbeRadius, 25.0f),
+		FMath::Max(PlacementProbeRadius * 0.5f, 25.0f));
+
+	DrawDebugBox(
+		GetWorld(),
+		PreviewTransform.GetLocation() + FVector(0.0f, 0.0f, PreviewExtent.Z),
+		PreviewExtent,
+		PreviewTransform.GetRotation(),
+		PreviewColor,
+		false,
+		GhostPreviewLifetimeSeconds,
+		0,
+		GhostPreviewLineThickness);
+
+	OnBuildPreviewUpdated.Broadcast(bCanPlace, PreviewTransform, FailureReason);
+}
+
 bool UAgrarianBuildingPlacementComponent::HasPlacementCost(FText& FailureReason) const
 {
 	const UAgrarianInventoryComponent* Inventory = GetOwner() ? GetOwner()->FindComponentByClass<UAgrarianInventoryComponent>() : nullptr;