it is done

core/src/mindustry/entities/traits/TargetTrait.java

@@ -0,0 +1,35 @@
+package mindustry.entities.traits;
+
+import arc.math.geom.Position;
+import mindustry.game.Team;
+
+/**
+ * Base interface for targetable entities.
+ */
+public interface TargetTrait extends Position, VelocityTrait{
+
+    boolean isDead();
+
+    Team getTeam();
+
+    default float getTargetVelocityX(){
+        if(this instanceof SolidTrait){
+            return ((SolidTrait)this).getDeltaX();
+        }
+        return velocity().x;
+    }
+
+    default float getTargetVelocityY(){
+        if(this instanceof SolidTrait){
+            return ((SolidTrait)this).getDeltaY();
+        }
+        return velocity().y;
+    }
+
+    /**
+     * Whether this entity is a valid target.
+     */
+    default boolean isValid(){
+        return !isDead();
+    }
+}