Add EditorPlacementLimit property

Limits the number of object instances that can be placed of a given def.

planet/System.ocg/LanguageDE.txt

@@ -44,6 +44,7 @@ IDS_CNS_CONTENTS=Inhalt:
 IDS_CNS_CREATE=Erzeugen
 IDS_CNS_CREATESTATUS=Platzierung: %s
 IDS_CNS_CREATOR=Objekte erstellen
+IDS_CNS_CREATORTOOMANYINSTANCES=Fehler beim Erstellen: Von diesem Objekttyp koennen maximal %d Objekte platziert werden.
 IDS_CNS_DEFINITIONS=Definitionen
 IDS_CNS_DESCRIPTION=Beschreibung
 IDS_CNS_DROPNODEF=Ungültiges oder nicht geladenes Objekt: %s

planet/System.ocg/LanguageUS.txt

@@ -44,6 +44,7 @@ IDS_CNS_CONTENTS=Contents:
 IDS_CNS_CREATE=Create
 IDS_CNS_CREATESTATUS=Place new %s
 IDS_CNS_CREATOR=Create objects
+IDS_CNS_CREATORTOOMANYINSTANCES=Error creating object: Maximum instance count of %d reached for this object type.
 IDS_CNS_DEFINITIONS=Definitions
 IDS_CNS_DESCRIPTION=Description
 IDS_CNS_DROPNODEF=Object invalid or not loaded: %s

src/control/C4Control.cpp

@@ -1353,6 +1353,20 @@ void C4ControlEMMoveObject::Execute() const
 	break;
 	case EMMO_Create:
 	{
+		// Check max object count
+		C4ID iddef = C4ID(StringParam);
+		C4Def *def = C4Id2Def(iddef);
+		if (!def) return;
+		int32_t placement_limit = def->GetPropertyInt(P_EditorPlacementLimit);
+		if (placement_limit)
+		{
+			if (Game.ObjectCount(iddef) >= placement_limit)
+			{
+				// Too many objects
+				::Console.Message(FormatString(LoadResStr("IDS_CNS_CREATORTOOMANYINSTANCES"), int(placement_limit)).getData());
+				return;
+			}
+		}
 		// Create object outside or contained
 		// If container is desired but not valid, do nothing (don't create object outside instead)
 		C4Object *container = NULL;
@@ -1366,7 +1380,7 @@ void C4ControlEMMoveObject::Execute() const
 		// Qt editor: Object creation is done through creator; centered creation is usually more convenient
 		create_centered = true;
 #endif
-		C4Object *obj = ::Game.CreateObject(C4ID(StringParam), nullptr, NO_OWNER, fixtoi(tx), fixtoi(ty), 0, create_centered);
+		C4Object *obj = ::Game.CreateObject(iddef, nullptr, NO_OWNER, fixtoi(tx), fixtoi(ty), 0, create_centered);
 		if (container && obj && container->Status && obj->Status) obj->Enter(container);
 		if (obj && obj->Status) obj->Call(P_EditorInitialize); // specific initialization when placed in editor
 	}

src/script/C4StringTable.cpp

@@ -290,6 +290,7 @@ C4StringTable::C4StringTable()
 	P[P_Description] = "Description";
 	P[P_AllowEditing] = "AllowEditing";
 	P[P_EditorInitialize] = "EditorInitialize";
+	P[P_EditorPlacementLimit] = "EditorPlacementLimit";
 	P[DFA_WALK] = "WALK";
 	P[DFA_FLIGHT] = "FLIGHT";
 	P[DFA_KNEEL] = "KNEEL";

src/script/C4StringTable.h

@@ -514,6 +514,7 @@ enum C4PropertyName
 	P_Description,
 	P_AllowEditing,
 	P_EditorInitialize,
+	P_EditorPlacementLimit,
 // Default Action Procedures
 	DFA_WALK,
 	DFA_FLIGHT,