Apply most clippy lints

plotters-backend/src/rasterizer/polygon.rs

@@ -49,7 +49,7 @@ impl Edge {
 
 impl PartialOrd for Edge {
     fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
-        self.get_slave_pos().partial_cmp(&other.get_slave_pos())
+        Some(self.cmp(other))
     }
 }
 

plotters-bitmap/src/bitmap_pixel/bgrx.rs

@@ -36,7 +36,7 @@ impl PixelFormat for BGRXPixel {
         a: f64,
     ) {
         let (w, h) = target.get_size();
-        let a = a.min(1.0).max(0.0);
+        let a = a.clamp(0.0, 1.0);
         if a == 0.0 {
             return;
         }

plotters-bitmap/src/bitmap_pixel/rgb.rs

@@ -40,7 +40,7 @@ impl PixelFormat for RGBPixel {
         a: f64,
     ) {
         let (w, h) = target.get_size();
-        let a = a.min(1.0).max(0.0);
+        let a = a.clamp(0.0, 1.0);
         if a == 0.0 {
             return;
         }

plotters-svg/src/svg.rs

@@ -27,20 +27,13 @@ fn make_svg_opacity(color: BackendColor) -> String {
 enum Target<'a> {
     File(String, &'a Path),
     Buffer(&'a mut String),
-    // TODO: At this point we won't make the breaking change
-    // so the u8 buffer is still supported. But in 0.3, we definitely
-    // should get rid of this.
-    #[cfg(feature = "deprecated_items")]
-    U8Buffer(String, &'a mut Vec<u8>),
 }
 
 impl Target<'_> {
     fn get_mut(&mut self) -> &mut String {
         match self {
             Target::File(ref mut buf, _) => buf,
             Target::Buffer(buf) => buf,
-            #[cfg(feature = "deprecated_items")]
-            Target::U8Buffer(ref mut buf, _) => buf,
         }
     }
 }
@@ -147,24 +140,6 @@ impl<'a> SVGBackend<'a> {
         ret
     }
 
-    /// Create a new SVG drawing backend and store the document into a u8 vector
-    #[cfg(feature = "deprecated_items")]
-    #[deprecated(
-        note = "This will be replaced by `with_string`, consider use `with_string` to avoid breaking change in the future"
-    )]
-    pub fn with_buffer(buf: &'a mut Vec<u8>, size: (u32, u32)) -> Self {
-        let mut ret = Self {
-            target: Target::U8Buffer(String::default(), buf),
-            size,
-            tag_stack: vec![],
-            saved: false,
-        };
-
-        ret.init_svg_file(size);
-
-        ret
-    }
-
     /// Create a new SVG drawing backend and store the document into a String buffer
     pub fn with_string(buf: &'a mut String, size: (u32, u32)) -> Self {
         let mut ret = Self {
@@ -203,11 +178,6 @@ impl<'a> DrawingBackend for SVGBackend<'a> {
                         .map_err(DrawingErrorKind::DrawingError)?;
                 }
                 Target::Buffer(_) => {}
-                #[cfg(feature = "deprecated_items")]
-                Target::U8Buffer(ref actual, ref mut target) => {
-                    target.clear();
-                    target.extend_from_slice(actual.as_bytes());
-                }
             }
             self.saved = true;
         }
@@ -481,11 +451,11 @@ impl<'a> DrawingBackend for SVGBackend<'a> {
     }
 
     #[cfg(all(not(target_arch = "wasm32"), feature = "image"))]
-    fn blit_bitmap<'b>(
+    fn blit_bitmap(
         &mut self,
         pos: BackendCoord,
         (w, h): (u32, u32),
-        src: &'b [u8],
+        src: &[u8],
     ) -> Result<(), DrawingErrorKind<Self::ErrorType>> {
         use image::codecs::png::PngEncoder;
         use image::ImageEncoder;
@@ -508,9 +478,7 @@ impl<'a> DrawingBackend for SVGBackend<'a> {
         }
 
         let padding = (3 - data.len() % 3) % 3;
-        for _ in 0..padding {
-            data.push(0);
-        }
+        data.resize(data.len() + padding, 0);
 
         let mut rem_bits = 0;
         let mut rem_num = 0;

plotters/Cargo.toml

@@ -4,6 +4,7 @@ version = "0.3.6"
 authors = ["Hao Hou <haohou302@gmail.com>"]
 edition = "2018"
 license = "MIT"
+msrv = "1.56"
 description = "A Rust drawing library focus on data plotting for both WASM and native applications"
 repository = "https://github.com/plotters-rs/plotters"
 homepage = "https://plotters-rs.github.io/"
@@ -12,6 +13,10 @@ categories = ["visualization", "wasm"]
 readme = "../README.md"
 exclude = ["doc-template", "plotters-doc-data"]
 
+[lints.rust]
+unexpected_cfgs = { level = "warn", check-cfg = ['cfg(doc_cfg)'] }
+deprecated = { level = "allow" }
+
 [dependencies]
 num-traits = "0.2.14"
 chrono = { version = "0.4.32", optional = true }

plotters/examples/3d-plot.rs

@@ -9,7 +9,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
     let z_axis = (-3.0..3.0).step(0.1);
 
     let mut chart = ChartBuilder::on(&area)
-        .caption("3D Plot Test".to_string(), ("sans", 20))
+        .caption("3D Plot Test", ("sans", 20))
         .build_cartesian_3d(x_axis.clone(), -3.0..3.0, z_axis.clone())?;
 
     chart.with_projection(|mut pb| {

plotters/examples/matshow.rs

@@ -11,7 +11,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
         .margin(5)
         .top_x_label_area_size(40)
         .y_label_area_size(40)
-        .build_cartesian_2d(0i32..15i32, 15i32..0i32)?;
+        .build_cartesian_2d(0i32..15i32, 0i32..15i32)?;
 
     chart
         .configure_mesh()

plotters/src/chart/builder.rs

@@ -194,7 +194,7 @@ impl<'a, 'b, DB: DrawingBackend> ChartBuilder<'a, 'b, DB> {
     Sets the size of the X label area at the bottom of the chart.
 
     - `size`: The desired size of the X label area in backend units (pixels).
-    If set to 0, the X label area is removed.
+      If set to 0, the X label area is removed.
 
     See [`ChartBuilder::on()`] for more information and examples.
     */
@@ -206,7 +206,7 @@ impl<'a, 'b, DB: DrawingBackend> ChartBuilder<'a, 'b, DB> {
     Sets the size of the Y label area to the left of the chart.
 
     - `size`: The desired size of the Y label area in backend units (pixels).
-    If set to 0, the Y label area is removed.
+      If set to 0, the Y label area is removed.
 
     See [`ChartBuilder::on()`] for more information and examples.
     */
@@ -218,7 +218,7 @@ impl<'a, 'b, DB: DrawingBackend> ChartBuilder<'a, 'b, DB> {
     Sets the size of the X label area at the top of the chart.
 
     - `size`: The desired size of the top X label area in backend units (pixels).
-    If set to 0, the top X label area is removed.
+      If set to 0, the top X label area is removed.
 
     See [`ChartBuilder::on()`] for more information and examples.
     */
@@ -230,7 +230,7 @@ impl<'a, 'b, DB: DrawingBackend> ChartBuilder<'a, 'b, DB> {
     Sets the size of the Y label area to the right of the chart.
 
     - `size`: The desired size of the Y label area in backend units (pixels).
-    If set to 0, the Y label area to the right is removed.
+      If set to 0, the Y label area to the right is removed.
 
     See [`ChartBuilder::on()`] for more information and examples.
     */
@@ -243,7 +243,7 @@ impl<'a, 'b, DB: DrawingBackend> ChartBuilder<'a, 'b, DB> {
 
     - `pos`: The position of the desired label area to adjust
     - `size`: The desired size of the label area in backend units (pixels).
-    If set to 0, the label area is removed.
+      If set to 0, the label area is removed.
 
     See [`ChartBuilder::on()`] for more information and examples.
     */

plotters/src/chart/context/cartesian3d/mod.rs

@@ -106,9 +106,9 @@ where
     /// Override the 3D projection matrix. This function allows to override the default projection
     /// matrix.
     /// - `pf`: A function that takes the default projection matrix configuration and returns the
-    /// projection matrix. This function will allow you to adjust the pitch, yaw angle and the
-    /// centeral point of the projection, etc. You can also build a projection matrix which is not
-    /// relies on the default configuration as well.
+    ///   projection matrix. This function will allow you to adjust the pitch, yaw angle and the
+    ///   centeral point of the projection, etc. You can also build a projection matrix which is not
+    ///   relies on the default configuration as well.
     pub fn with_projection<P: FnOnce(ProjectionMatrixBuilder) -> ProjectionMatrix>(
         &mut self,
         pf: P,

plotters/src/coord/ranged1d/combinators/logarithmic.rs

@@ -181,7 +181,7 @@ impl<V: LogScalable> LogCoord<V> {
         let a = V::from_f64(fv + self.zero_point);
         let b = V::from_f64(self.zero_point);
 
-        (V::as_f64(&a) - V::as_f64(&b)).abs() < std::f64::EPSILON
+        (V::as_f64(&a) - V::as_f64(&b)).abs() < f64::EPSILON
     }
 }
 

plotters/src/coord/ranged1d/discrete.rs

@@ -91,9 +91,10 @@ where
 /// - Add an extra dummy element after all the values in original discrete coordinate
 /// - Logically each value `v` from original coordinate system is mapped into an segment `[v, v+1)` where `v+1` denotes the successor of the `v`
 /// - Introduce two types of values `SegmentValue::Exact(value)` which denotes the left end of value's segment and `SegmentValue::CenterOf(value)` which refers the center of the segment.
-/// This is used in histogram types, which uses a discrete coordinate as the buckets. The segmented coord always emits `CenterOf(value)` key points, thus it allows all the label and tick marks
-/// of the coordinate rendered in the middle of each segment.
-/// The corresponding trait [IntoSegmentedCoord](trait.IntoSegmentedCoord.html) is used to apply this decorator to coordinates.
+///   This is used in histogram types, which uses a discrete coordinate as the buckets.
+///   The segmented coord always emits `CenterOf(value)` key points, thus it allows all the label and tick marks
+///   of the coordinate rendered in the middle of each segment.
+///   The corresponding trait [IntoSegmentedCoord](trait.IntoSegmentedCoord.html) is used to apply this decorator to coordinates.
 #[derive(Clone)]
 pub struct SegmentedCoord<D: DiscreteRanged>(D);
 

plotters/src/coord/ranged1d/mod.rs

@@ -186,12 +186,12 @@ pub trait Ranged {
     /// This marker decides if Plotters default [ValueFormatter](trait.ValueFormatter.html) implementation should be used.
     /// This associated type can be one of the following two types:
     /// - [DefaultFormatting](struct.DefaultFormatting.html) will allow Plotters to automatically impl
-    /// the formatter based on `Debug` trait, if `Debug` trait is not impl for the `Self::Value`,
-    /// [ValueFormatter](trait.ValueFormatter.html) will not impl unless you impl it manually.
+    ///   the formatter based on `Debug` trait, if `Debug` trait is not impl for the `Self::Value`,
+    ///   [ValueFormatter](trait.ValueFormatter.html) will not impl unless you impl it manually.
     ///
     /// - [NoDefaultFormatting](struct.NoDefaultFormatting.html) Disable the automatic `Debug`
-    /// based value formatting. Thus you have to impl the
-    /// [ValueFormatter](trait.ValueFormatter.html) manually.
+    ///   based value formatting. Thus you have to impl the
+    ///   [ValueFormatter](trait.ValueFormatter.html) manually.
     ///
     type FormatOption: DefaultValueFormatOption;
 

plotters/src/coord/ranged1d/types/datetime.rs

@@ -163,16 +163,19 @@ impl<Z: TimeZone> TimeValue for DateTime<Z> {
 
 impl TimeValue for NaiveDateTime {
     type DateType = NaiveDate;
+
     fn date_floor(&self) -> NaiveDate {
         self.date()
     }
+
     fn date_ceil(&self) -> NaiveDate {
         if self.time().num_seconds_from_midnight() > 0 {
             self.date() + Duration::days(1)
         } else {
             self.date()
         }
     }
+
     fn earliest_after_date(date: NaiveDate) -> NaiveDateTime {
         date.and_hms(0, 0, 0)
     }

plotters/src/coord/ranged1d/types/mod.rs

@@ -9,7 +9,7 @@ pub use datetime::{
 mod numeric;
 pub use numeric::{
     RangedCoordf32, RangedCoordf64, RangedCoordi128, RangedCoordi32, RangedCoordi64,
-    RangedCoordu128, RangedCoordu32, RangedCoordu64, RangedCoordusize, RangedCoordisize,
+    RangedCoordisize, RangedCoordu128, RangedCoordu32, RangedCoordu64, RangedCoordusize,
 };
 
 mod slice;

plotters/src/coord/ranged1d/types/numeric.rs

@@ -125,7 +125,7 @@ macro_rules! gen_key_points_comp {
 
             assert!(!(range.0.is_nan() || range.1.is_nan()));
 
-            if (range.0 - range.1).abs() < std::f64::EPSILON {
+            if (range.0 - range.1).abs() < f64::EPSILON {
                 return vec![range.0 as $type];
             }
 
@@ -141,7 +141,7 @@ macro_rules! gen_key_points_comp {
                 } else {
                     a - (a / b).ceil() * b
                 };
-                if (ret - b).abs() < std::f64::EPSILON {
+                if (ret - b).abs() < f64::EPSILON {
                     0.0
                 } else {
                     ret
@@ -191,7 +191,7 @@ macro_rules! gen_key_points_comp {
             let left_base = (left / value_granularity).floor() * value_granularity;
             let mut left_relative = left - left_base;
             let right = range.1 - rem_euclid(range.1, scale);
-            while (right - left_relative - left_base) >= -std::f64::EPSILON {
+            while (right - left_relative - left_base) >= -f64::EPSILON {
                 let new_left_relative =
                     (left_relative / value_granularity).round() * value_granularity;
                 if new_left_relative < 0.0 {

plotters/src/data/quartiles.rs

@@ -19,7 +19,7 @@ impl Quartiles {
         assert!(0_f64 <= pct);
         let hundred = 100_f64;
         assert!(pct <= hundred);
-        if (pct - hundred).abs() < std::f64::EPSILON {
+        if (pct - hundred).abs() < f64::EPSILON {
             return s[s.len() - 1].into();
         }
         let length = (s.len() - 1) as f64;

plotters/src/drawing/area.rs

@@ -258,12 +258,12 @@ impl<DB: DrawingBackend, CT: CoordTranslate> DrawingArea<DB, CT> {
 
     /// Compute the relative size based on the drawing area's height
     pub fn relative_to_height(&self, p: f64) -> f64 {
-        f64::from((self.rect.y1 - self.rect.y0).max(0)) * (p.min(1.0).max(0.0))
+        f64::from((self.rect.y1 - self.rect.y0).max(0)) * (p.clamp(0.0, 1.0))
     }
 
     /// Compute the relative size based on the drawing area's width
     pub fn relative_to_width(&self, p: f64) -> f64 {
-        f64::from((self.rect.x1 - self.rect.x0).max(0)) * (p.min(1.0).max(0.0))
+        f64::from((self.rect.x1 - self.rect.x0).max(0)) * (p.clamp(0.0, 1.0))
     }
 
     /// Get the pixel range of this area
@@ -669,13 +669,13 @@ mod drawing_area_tests {
                     for row in 0..=nyb {
                         for col in 0..=nxb {
                             let get_bp = |full, limit, id| {
-                                (if id == 0 {
+                                if id == 0 {
                                     0
                                 } else if id > limit {
                                     full
                                 } else {
                                     breaks[id as usize - 1]
-                                })
+                                }
                             };
 
                             let expected_u = (get_bp(1024, nxb, col), get_bp(768, nyb, row));

plotters/src/element/image.rs

@@ -89,7 +89,7 @@ impl<'a, Coord, P: PixelFormat> BitMapElement<'a, Coord, P> {
     /// - `size`: The size of the bitmap
     /// - `buf`: The buffer to use
     /// - **returns**: The newly created image element, if the buffer isn't fit the image
-    /// dimension, this will returns an `None`.
+    ///   dimension, this will returns an `None`.
     pub fn with_owned_buffer(pos: Coord, size: (u32, u32), buf: Vec<u8>) -> Option<Self> {
         if buf.len() < (size.0 * size.1) as usize * P::PIXEL_SIZE {
             return None;
@@ -109,7 +109,7 @@ impl<'a, Coord, P: PixelFormat> BitMapElement<'a, Coord, P> {
     /// - `size`: The size of the bitmap
     /// - `buf`: The buffer to use
     /// - **returns**: The newly created image element, if the buffer isn't fit the image
-    /// dimension, this will returns an `None`.
+    ///   dimension, this will returns an `None`.
     pub fn with_mut(pos: Coord, size: (u32, u32), buf: &'a mut [u8]) -> Option<Self> {
         if buf.len() < (size.0 * size.1) as usize * P::PIXEL_SIZE {
             return None;
@@ -130,7 +130,7 @@ impl<'a, Coord, P: PixelFormat> BitMapElement<'a, Coord, P> {
     /// - `size`: The size of the bitmap
     /// - `buf`: The buffer to use
     /// - **returns**: The newly created image element, if the buffer isn't fit the image
-    /// dimension, this will returns an `None`.
+    ///   dimension, this will returns an `None`.
     pub fn with_ref(pos: Coord, size: (u32, u32), buf: &'a [u8]) -> Option<Self> {
         if buf.len() < (size.0 * size.1) as usize * P::PIXEL_SIZE {
             return None;

plotters/src/element/text.rs

@@ -1,5 +1,4 @@
 use std::borrow::Borrow;
-use std::i32;
 
 use super::{Drawable, PointCollection};
 use crate::style::{FontDesc, FontResult, LayoutBox, TextStyle};

plotters/src/evcxr.rs

@@ -48,8 +48,7 @@ pub fn evcxr_figure<
     SVGWrapper(buffer, "".to_string())
 }
 
-// An evcxr figure that can save to the local file system and render in a notebook.
-
+/// An evcxr figure that can save to the local file system and render in a notebook.
 pub fn evcxr_figure_with_saving<
     Draw: FnOnce(DrawingArea<SVGBackend, Shift>) -> Result<(), Box<dyn std::error::Error>>,
 >(
@@ -77,8 +76,9 @@ pub fn evcxr_bitmap_figure<
     draw: Draw,
 ) -> SVGWrapper {
     const PIXEL_SIZE: usize = 3;
-    let mut buf = Vec::new();
-    buf.resize((size.0 as usize) * (size.1 as usize) * PIXEL_SIZE, 0);
+
+    let mut buf = vec![0; (size.0 as usize) * (size.1 as usize) * PIXEL_SIZE];
+
     let root = BitMapBackend::with_buffer(&mut buf, size).into_drawing_area();
     draw(root).expect("Drawing failure");
     let mut buffer = "".to_string();