Experimental positional spawn support / WIP map

core/src/mindustry/game/SpawnGroup.java

@@ -36,10 +36,12 @@ public class SpawnGroup implements JsonSerializable, Cloneable{
     public float unitScaling = never;
     /** Shield points that this unit has. */
     public float shields = 0f;
-    /** How much shields get increased per wave. */
+    /** How much shields get increased by per wave. */
     public float shieldScaling = 0f;
     /** Amount of enemies spawned initially, with no scaling */
     public int unitAmount = 1;
+    /** If not -1, the unit will only spawn in spawnpoints with these packed coordinates. */
+    public int spawn = -1;
     /** Seq of payloads that this unit will spawn with. */
     public @Nullable Seq<UnitType> payloads;
     /** Status effect applied to the spawned unit. Null to disable. */
@@ -55,6 +57,10 @@ public class SpawnGroup implements JsonSerializable, Cloneable{
         //serialization use only
     }
 
+    public boolean canSpawn(int position){
+        return spawn == -1 || spawn == position;
+    }
+
     /** @return amount of units spawned on a specific wave. */
     public int getSpawned(int wave){
         if(spacing == 0) spacing = 1;
@@ -111,6 +117,7 @@ public class SpawnGroup implements JsonSerializable, Cloneable{
         if(shieldScaling != 0) json.writeValue("shieldScaling", shieldScaling);
         if(unitAmount != 1) json.writeValue("amount", unitAmount);
         if(effect != null) json.writeValue("effect", effect.name);
+        if(spawn != -1) json.writeValue("spawn", spawn);
         if(payloads != null && payloads.size > 0){
             json.writeValue("payloads", payloads.map(u -> u.name).toArray(String.class));
         }
@@ -130,6 +137,7 @@ public class SpawnGroup implements JsonSerializable, Cloneable{
         shields = data.getFloat("shields", 0);
         shieldScaling = data.getFloat("shieldScaling", 0);
         unitAmount = data.getInt("amount", 1);
+        spawn = data.getInt("spawn", -1);
         if(data.has("payloads")){
             payloads = Seq.with(json.readValue(String[].class, data.get("payloads"))).map(s -> content.getByName(ContentType.unit, s));
         }