improve TrackedLocation (#727)

Author: goodroach

api/src/main/java/net/countercraft/movecraft/TrackedLocation.java

@@ -2,8 +2,11 @@
 
 import net.countercraft.movecraft.craft.Craft;
 import net.countercraft.movecraft.util.MathUtils;
+import org.bukkit.NamespacedKey;
 import org.jetbrains.annotations.NotNull;
 
+import java.util.HashSet;
+
 public class TrackedLocation {
     private MovecraftLocation offSet;
     private final Craft craft;
@@ -20,6 +23,21 @@ public TrackedLocation(@NotNull Craft craft, @NotNull MovecraftLocation location
         offSet = location.subtract(midPoint);
     }
 
+    /**
+     * Creates a new TrackedLocation instance which tracks a location about a craft's midpoint.
+     * @param craft The craft that's that tied to the location.
+     * @param location The absolute position to track. This location will be stored as a relative
+     *                 location to the craft's central hitbox.
+     * @param key The namespaced key that references a set of tracked locations stored within the craft.
+     */
+    public TrackedLocation(@NotNull Craft craft, @NotNull MovecraftLocation location, @NotNull NamespacedKey key) {
+        this(craft, location);
+        if (craft.getTrackedLocations().get(key) == null) {
+            craft.getTrackedLocations().put(key, new HashSet<>());
+        }
+        craft.getTrackedLocations().get(key).add(this);
+    }
+
     /**
      * Rotates the stored location.
      * @param rotation A clockwise or counter-clockwise direction to rotate.
@@ -44,4 +62,12 @@ public MovecraftLocation getAbsoluteLocation() {
     public MovecraftLocation getOffSet() {
         return offSet;
     }
+
+    /**
+     * Gets the craft associated with the tracked location.
+     * @return Returns the craft.
+     */
+    public Craft getCraft() {
+        return craft;
+    }
 }