sim: use usize instead of i16 for garbage level min/max

tidepool/src/garbage.rs

@@ -8,7 +8,7 @@ pub struct Garbage<R: Rng> {
     // current level of garbage on the matrix
     level: i16,
     // min/max garbage to insert on the matrix
-    range: RangeInclusive<i16>,
+    range: RangeInclusive<usize>,
 }
 
 impl<R: Rng> Garbage<R> {
@@ -17,7 +17,7 @@ impl<R: Rng> Garbage<R> {
     /// - `rng`: random number source
     /// - `count`: total number of garbage rows to insert
     /// - `range`: min/max amount of garbage on the matrix at a given time
-    pub fn new(rng: R, count: usize, range: RangeInclusive<i16>) -> Self {
+    pub fn new(rng: R, count: usize, range: RangeInclusive<usize>) -> Self {
         Self {
             cheese: Cheese::new(rng).take(count),
             level: 0,
@@ -47,7 +47,7 @@ impl<R: Rng> Garbage<R> {
         } else {
             *self.range.end()
         };
-        let difference = (target as usize).saturating_sub(self.level as usize);
+        let difference = target.saturating_sub(self.level as usize);
 
         (&mut self.cheese)
             .take(difference)

tidepool/src/sim.rs

@@ -10,7 +10,7 @@ pub struct Options {
     /// Total number of garbage lines required to clear.
     pub goal: usize,
     /// Min/max number of garbage lines on the matrix at a given time.
-    pub garbage: RangeInclusive<i16>,
+    pub garbage: RangeInclusive<usize>,
     /// Number of preview pieces.
     pub previews: usize,
 }