other: use custom time chart grid implementation

CHANGELOG.md

@@ -19,6 +19,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - [#690](https://github.com/ClementTsang/bottom/pull/690): Add some colour to `-h`/`--help` as part of updating to clap 3.0.
 - [#807](https://github.com/ClementTsang/bottom/pull/807): Add more human friendly temperature sensor names for Linux.
+- [#845](https://github.com/ClementTsang/bottom/pull/845), [#922](https://github.com/ClementTsang/bottom/pull/922): Add macOS M1, FreeBSD 12, and FreeBSD 13 binary build tasks.
+- [#916](https://github.com/ClementTsang/bottom/pull/916), [#937](https://github.com/ClementTsang/bottom/pull/937): Improve CPU usage by optimizing draw logic of charts and tables.
 
 ## Features
 
@@ -34,7 +36,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - [#870](https://github.com/ClementTsang/bottom/pull/870): Make disk widget sortable.
 - [#881](https://github.com/ClementTsang/bottom/pull/881): Add pasting to the search bar.
 - [#892](https://github.com/ClementTsang/bottom/pull/892): Add custom retention periods for data.
-- [#899](https://github.com/ClementTsang/bottom/pull/899): Add non-normalized CPU usage to processes.
+- [#899](https://github.com/ClementTsang/bottom/pull/899), [#910](https://github.com/ClementTsang/bottom/pull/910), [#912](https://github.com/ClementTsang/bottom/pull/912): Add non-normalized CPU usage to processes.
 - [#919](https://github.com/ClementTsang/bottom/pull/919): Add an option to expand the default widget on startup.
 
 ## [0.6.8] - 2022-02-01

Cargo.toml

@@ -128,9 +128,21 @@ clap_mangen = "0.1.6"
 [package.metadata.deb]
 section = "utility"
 assets = [
-    ["target/release/btm", "usr/bin/", "755"],
-    ["LICENSE", "usr/share/doc/btm/", "644"],
-    ["manpage/btm.1.gz", "usr/share/man/man1/btm.1.gz", "644"],
+    [
+        "target/release/btm",
+        "usr/bin/",
+        "755",
+    ],
+    [
+        "LICENSE",
+        "usr/share/doc/btm/",
+        "644",
+    ],
+    [
+        "manpage/btm.1.gz",
+        "usr/share/man/man1/btm.1.gz",
+        "644",
+    ],
     [
         "completion/btm.bash",
         "usr/share/bash-completion/completions/btm",
@@ -141,7 +153,11 @@ assets = [
         "usr/share/fish/vendor_completions.d/btm.fish",
         "644",
     ],
-    ["completion/_btm", "usr/share/zsh/vendor-completions/", "644"],
+    [
+        "completion/_btm",
+        "usr/share/zsh/vendor-completions/",
+        "644",
+    ],
 ]
 extended-description = """
 

src/components/tui_widget/time_chart.rs

@@ -1,13 +1,16 @@
+mod canvas;
+
 use std::{borrow::Cow, cmp::max};
 
+use canvas::*;
 use tui::{
     buffer::Buffer,
     layout::{Constraint, Rect},
     style::{Color, Style},
     symbols::{self, Marker},
     text::{Span, Spans},
     widgets::{
-        canvas::{Canvas, Line, Points},
+        canvas::{Line, Points},
         Block, Borders, GraphType, Widget,
     },
 };
@@ -428,6 +431,13 @@ impl<'a> Widget for TimeChart<'a> {
             .y_bounds(self.y_axis.bounds)
             .marker(self.marker)
             .paint(|ctx| {
+                // Idea is to:
+                // - Go over all datasets, determine *where* a point will be drawn.
+                // - We take the topmost (last) point first.
+                // - After we determine all points, then we paint them all.
+                // This helps relieve the issue where normally, braille grids are painted via |=, when we want
+                // an exclusive replacement.
+
                 for dataset in &self.datasets {
                     let color = dataset.style.fg.unwrap_or(Color::Reset);