diff --git a/src/lib8/noise.rs b/src/lib8/noise.rs
index d50bbbf..e921bca 100644
--- a/src/lib8/noise.rs
+++ b/src/lib8/noise.rs
@@ -1,8 +1,6 @@
 use crate::lib8::interpolate::*;
 
-use num::PrimInt;
-
-const noise_cube: [u8; 257] = [
+const NOISE_CUBE: [u8; 257] = [
     151, 160, 137,  91,  90,  15, 131,  13, 201,  95,  96,  53, 194, 233,   7, 225,
 140,  36, 103,  30,  69, 142,   8,  99,  37, 240,  21,  10,  23, 190,   6, 148,
 247, 120, 234,  75,   0,  26, 197,  62,  94, 252, 219, 203, 117,  35,  11,  32,
@@ -21,39 +19,39 @@ const noise_cube: [u8; 257] = [
 222, 114,  67,  29,  24,  72, 243, 141, 128, 195,  78,  66, 215,  61, 156, 180,
 151];
 
-const fn P(x: u8) -> u8 {
-    noise_cube[x as usize]
+const fn get_cube(x: u8) -> u8 {
+    NOISE_CUBE[x as usize]
 }
 
-fn inoise8_raw(x: u16, y: u16) -> i8 {
-    let X: u8 = x.wrapping_shr(8) as u8;
-    let Y: u8 = y.wrapping_shr(8) as u8;
+fn inoise8_raw(x_src: u16, y_src: u16) -> i8 {
+    let x = x_src.wrapping_shr(8) as u8;
+    let y = y_src.wrapping_shr(8) as u8;
 
-    let A: u8 = P(X) + Y;
-    let AA: u8 = P(A);
-    let AB: u8 = P(A+1);
-    let B: u8 = P(X+1) + Y;
-    let BA: u8 = P(B);
-    let BB: u8 = P(B+1);
+    let a  = get_cube(x) + y;
+    let aa = get_cube(a);
+    let ab = get_cube(a+1);
+    let b = get_cube(x+1) + y;
+    let ba = get_cube(b);
+    let bb = get_cube(b+1);
 
-    let mut u: u8 = x as u8;
-    let mut v: u8 = y as u8;
+    let mut u = x_src as u8;
+    let mut v = y_src as u8;
 
-    let xx: i8 = ((x as u8).wrapping_shr(1) & 0x7f) as i8;
-    let yy: i8 = ((y as u8).wrapping_shr(1) & 0x7f) as i8;
-    let N: i8 = 0x80u8 as i8;
+    let xx = ((x_src as u8).wrapping_shr(1) & 0x7f) as i8;
+    let yy = ((y_src as u8).wrapping_shr(1) & 0x7f) as i8;
+    let n = 0x80u8 as i8;
 
     u = ease8InOutQuad(u);
     v = ease8InOutQuad(v);
 
-    let X1: i8 = lerp7by8(grad8(P(AA), xx, yy), grad8(P(BA), xx.wrapping_sub(N), yy), u);
-    let X2: i8 = lerp7by8(grad8(P(AB), xx, yy.wrapping_sub(N)), grad8(P(BB), xx.wrapping_sub(N), yy.wrapping_sub(N)), u);
+    let x1 = lerp7by8(grad8(get_cube(aa), xx, yy), grad8(get_cube(ba), xx.wrapping_sub(n), yy), u);
+    let x2 = lerp7by8(grad8(get_cube(ab), xx, yy.wrapping_sub(n)), grad8(get_cube(bb), xx.wrapping_sub(n), yy.wrapping_sub(n)), u);
 
-    return lerp7by8(X1, X2, v);
+    return lerp7by8(x1, x2, v);
 }
 
 pub fn inoise8(x: i16, y: i16) -> u8 {
-    let mut n: i8 = inoise8_raw(x as u16, y as u16);
+    let mut n = inoise8_raw(x as u16, y as u16);
     n = n.wrapping_add(64);
     return (n as u8).saturating_add(n as u8);
 }