why things are keep happening?

src/net/torvald/terrarum/blockproperties/BlockCodex.kt

@@ -42,14 +42,18 @@ object BlockCodex {
         }
     }
 
-    fun get(index: Int): BlockProp {
+    /*fun get(index: Int): BlockProp {
         try {
             return blockProps[index]
         }
         catch (e: NullPointerException) {
             throw NullPointerException("Blockprop with id $index does not exist.")
         }
-    }
+        catch (e1: ArrayIndexOutOfBoundsException) {
+            if (index == -1) return nullProp
+            else throw e1
+        }
+    }*/
 
     operator fun get(rawIndex: Int?): BlockProp {
         if (rawIndex == null || rawIndex == Block.NULL) {

src/net/torvald/terrarum/gameactors/PhysTestBall.kt

@@ -40,5 +40,8 @@ class PhysTestBall : ActorWithPhysics(Actor.RenderOrder.MIDDLE, immobileBody = t
                 hitbox.posY.toFloat(),
                 hitbox.width.toFloat(),
                 hitbox.height.toFloat())
+
+
+        //println(moveDelta)
     }
 }

src/net/torvald/terrarum/utils/ROTCipher.kt

@@ -64,14 +64,14 @@ object ROTCipher {
     }
 
     /**
-     * Note; range starts with zero
+     * Note; domain starts from zero
      * @param number to rotate
      * @param rotation
-     * @param range size of the rotation table. 4 means (0,1,2,3)
+     * @param domain size of the rotation table (or domain of the function). 4 means (0,1,2,3)
      */
-    fun rotN(number: Int, rotation: Int, range: Int): Int {
+    private fun rotN(number: Int, rotation: Int, domain: Int): Int {
-        return if (number < range - rotation + 1) number + rotation
+        return if (number < domain - rotation + 1) number + rotation
-        else      number - (range - rotation + 1)
+        else      number - (domain - rotation + 1)
     }
 
     fun rot13(c: Char): Char {