diff --git a/.gitignore b/.gitignore
index 4409166..1e65ade 100644
--- a/.gitignore
+++ b/.gitignore
@@ -45,6 +45,7 @@
 .idea/gradle.xml
 .idea/dictionaries
 .idea/libraries
+.idea/caches
 
 # Keystore files
 *.jks
diff --git a/.idea/caches/build_file_checksums.ser b/.idea/caches/build_file_checksums.ser
index b13a40a..225349e 100644
--- a/.idea/caches/build_file_checksums.ser
+++ b/.idea/caches/build_file_checksums.ser
Binary files differ
diff --git a/src/framework/RWT/RWTSprite.java b/src/framework/RWT/RWTSprite.java
index 4d2c0a2..90b36f2 100644
--- a/src/framework/RWT/RWTSprite.java
+++ b/src/framework/RWT/RWTSprite.java
@@ -1,12 +1,11 @@
 package framework.RWT;
 
 
-import functions.Position;
+import myLibrary.Position;
 
 public class RWTSprite {
     private int textureNo;
 
     // 表示座標
-    private Position<Float, Float> pos;
-    private
+    private Position<Float> pos;
 }
diff --git a/src/functions/Position.java b/src/functions/Position.java
deleted file mode 100644
index 3b09fcd..0000000
--- a/src/functions/Position.java
+++ /dev/null
@@ -1,34 +0,0 @@
-package functions;
-
-public class Position<T extends Number> implements Cloneable {
-    public T x, y, z;
-
-    public Position() {
-        x = 0.0;
-        y = 0.0;
-    }
-
-    public Position(T1 val1, T2 val2) {
-        first = val1;
-        second = val2;
-    }
-
-    public void swap(Position<T1, T2> t){
-        Position<T1, T2> tmp = this;
-        first = t.first;
-        second = t.second;
-        t = tmp;
-    }
-
-    @SuppressWarnings("unchecked")
-    @Override
-    public Position<T1, T2> clone(){
-        Position<T1, T2> p = new Position<T1, T2>();
-        try {
-            p = (Position<T1, T2>)super.clone();
-        } catch (CloneNotSupportedException e) {
-            e.printStackTrace();
-        }
-        return p;
-    }
-}
diff --git a/src/myLibrary/Position.java b/src/myLibrary/Position.java
new file mode 100644
index 0000000..c75d7bf
--- /dev/null
+++ b/src/myLibrary/Position.java
@@ -0,0 +1,37 @@
+package myLibrary;
+
+public class Position<T extends Number> implements Cloneable {
+    public T x, y, z;
+
+    public Position() {
+        x = null;
+        y = null;
+        z = null;
+    }
+
+    public Position(T val1, T val2) {
+        x = val1;
+        y = val2;
+        z = null;
+    }
+
+    public void swap(Position<T> t){
+        Position<T> tmp = this.clone();
+        x = t.x;
+        y = t.y;
+        z = t.z;
+        t = tmp;
+    }
+
+    @SuppressWarnings("unchecked")
+    @Override
+    public Position<T> clone(){
+        Position<T> p = new Position<T>();
+        try {
+            p = (Position<T>)super.clone();
+        } catch (CloneNotSupportedException e) {
+            e.printStackTrace();
+        }
+        return p;
+    }
+}