minor cleanup

examples/histogram.rs

@@ -11,7 +11,7 @@ use std::{
 use tui::{
     backend::{Backend, CrosstermBackend},
     layout::{Constraint, Direction, Layout},
-    style::{Color, Modifier, Style},
+    style::{Color, Style},
     widgets::{Block, Borders, Histogram},
     Frame, Terminal,
 };
@@ -35,7 +35,7 @@ impl App {
     }
 
     fn on_tick(&mut self) {
-        for i in (0..self.size) {
+        for i in 0..self.size {
             self.data[i] = self.rng.gen_range(0..100);
         }
     }

src/widgets/histogram.rs

@@ -5,7 +5,6 @@ use crate::{
     symbols,
     widgets::{Block, Widget},
 };
-use std::cmp::min;
 use unicode_width::UnicodeWidthStr;
 
 /// A bar chart specialized for showing histograms
@@ -48,10 +47,6 @@ pub struct Histogram<'a> {
     /// buckets[1] counts items where bucket_size <= x < 2*bucket_size
     /// etc.
     buckets: Vec<u64>,
-    /// the size of each bucket
-    bucket_size: u64,
-    /// the number of buckets
-    n_buckets: u64,
     /// Value necessary for a bar to reach the maximum height (if no value is specified,
     /// the maximum value in the data is taken as reference)
     max: Option<u64>,
@@ -69,8 +64,6 @@ impl<'a> Default for Histogram<'a> {
             bar_style: Style::default(),
             bar_gap: 1,
             bar_set: symbols::bar::NINE_LEVELS,
-            bucket_size: 0,
-            n_buckets: 0,
             buckets: Vec::new(),
             value_style: Default::default(),
             label_style: Default::default(),