diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index 31000a2..8d45e55 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -2,21 +2,33 @@ name: Rust
 
 on:
   push:
-    branches: [ "main" ]
+    branches: ["main"]
   pull_request:
-    branches: [ "main" ]
+    branches: ["main"]
 
 env:
   CARGO_TERM_COLOR: always
 
 jobs:
   build:
-
     runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Build
+        run: cargo build --verbose
+      - name: Run tests
+        run: cargo test --verbose
 
+  linting:
+    name: Linting and formatting
+    runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
-    - name: Build
-      run: cargo build --verbose
-    - name: Run tests
-      run: cargo test --verbose
+      - uses: actions/checkout@v4
+      - uses: actions-rust-lang/setup-rust-toolchain@v1
+        with:
+          components: rustfmt
+      - name: Rustfmt Check
+        uses: actions-rust-lang/rustfmt@v1
+      - uses: actions/checkout@v4
+      - name: Run Clippy
+        run: cargo clippy --all-targets --all-features
diff --git a/Cargo.toml b/Cargo.toml
index 2da7951..3af0630 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,4 +1,5 @@
 [workspace]
+resolver = "2"
 members = [
   "charming",
   "gallery",
diff --git a/README.md b/README.md
index 6e4fa1e..d4708f9 100644
--- a/README.md
+++ b/README.md
@@ -22,9 +22,9 @@ Highlights:
         <td><img src="./img/theme/vintage.png" alt="Vintage" /><p align="center">Vintage</p></td>
     </tr>
     <tr>
-        <td><img src="./img/theme/westeros.png" alt="Westeros" /><p align="center">Vintage</p></td>
+        <td><img src="./img/theme/westeros.png" alt="Westeros" /><p align="center">Westeros</p></td>
         <td><img src="./img/theme/essos.png" alt="Essos" /><p align="center">Essos</p></td>
-        <td><img src="./img/theme/wonderland.png" alt="Wonderland" /><p align="center">Essos</p></td>
+        <td><img src="./img/theme/wonderland.png" alt="Wonderland" /><p align="center">Wonderland</p></td>
     </tr>
     <tr>
         <td><img src="./img/theme/walden.png" alt="Walden" /><p align="center">Walden</p></td>
diff --git a/charming/src/component/angle_axis.rs b/charming/src/component/angle_axis.rs
index 71d8f2e..ae29f68 100644
--- a/charming/src/component/angle_axis.rs
+++ b/charming/src/component/angle_axis.rs
@@ -99,6 +99,12 @@ pub struct AngleAxis {
     data: Vec<String>,
 }
 
+impl Default for AngleAxis {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl AngleAxis {
     pub fn new() -> Self {
         Self {
diff --git a/charming/src/component/aria.rs b/charming/src/component/aria.rs
index 8e1d158..67ab4f9 100644
--- a/charming/src/component/aria.rs
+++ b/charming/src/component/aria.rs
@@ -56,6 +56,12 @@ pub struct DecalItem {
     max_tile_height: Option<f64>,
 }
 
+impl Default for DecalItem {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl DecalItem {
     pub fn new() -> DecalItem {
         DecalItem {
@@ -141,6 +147,12 @@ pub struct Decal {
     decals: Vec<DecalItem>,
 }
 
+impl Default for Decal {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl Decal {
     pub fn new() -> Decal {
         Decal {
@@ -210,6 +222,12 @@ pub struct Aria {
     decal: Option<Decal>,
 }
 
+impl Default for Aria {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl Aria {
     pub fn new() -> Aria {
         Aria {
diff --git a/charming/src/component/axis.rs b/charming/src/component/axis.rs
index 7604878..7894529 100644
--- a/charming/src/component/axis.rs
+++ b/charming/src/component/axis.rs
@@ -126,6 +126,12 @@ pub struct Axis {
     data: Vec<String>,
 }
 
+impl Default for Axis {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl Axis {
     pub fn new() -> Self {
         Self {
diff --git a/charming/src/component/axis3d.rs b/charming/src/component/axis3d.rs
index c3e8423..4a20cd8 100644
--- a/charming/src/component/axis3d.rs
+++ b/charming/src/component/axis3d.rs
@@ -9,6 +9,12 @@ pub struct Axis3D {
     type_: Option<AxisType>,
 }
 
+impl Default for Axis3D {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl Axis3D {
     pub fn new() -> Self {
         Self { type_: None }
diff --git a/charming/src/component/data_zoom.rs b/charming/src/component/data_zoom.rs
index 22577fa..ece1d00 100644
--- a/charming/src/component/data_zoom.rs
+++ b/charming/src/component/data_zoom.rs
@@ -137,6 +137,12 @@ pub struct DataZoom {
     brush_select: Option<bool>,
 }
 
+impl Default for DataZoom {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl DataZoom {
     pub fn new() -> Self {
         Self {
diff --git a/charming/src/component/geo.rs b/charming/src/component/geo.rs
index e15fb9e..9dd5d72 100644
--- a/charming/src/component/geo.rs
+++ b/charming/src/component/geo.rs
@@ -86,6 +86,12 @@ pub struct Geo {
     silent: Option<bool>,
 }
 
+impl Default for Geo {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl Geo {
     pub fn new() -> Self {
         Self {
diff --git a/charming/src/component/geo_map.rs b/charming/src/component/geo_map.rs
index f0d6640..3c409fe 100644
--- a/charming/src/component/geo_map.rs
+++ b/charming/src/component/geo_map.rs
@@ -30,6 +30,12 @@ pub struct GeoMap {
     opt: Option<GeoMapOpt>,
 }
 
+impl Default for GeoMap {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl GeoMap {
     pub fn new() -> Self {
         GeoMap {
diff --git a/charming/src/component/grid.rs b/charming/src/component/grid.rs
index e24bfca..4f4d551 100644
--- a/charming/src/component/grid.rs
+++ b/charming/src/component/grid.rs
@@ -54,6 +54,12 @@ pub struct GridTooltip {
     extra_css_text: Option<String>,
 }
 
+impl Default for GridTooltip {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl GridTooltip {
     pub fn new() -> Self {
         Self {
@@ -207,6 +213,12 @@ pub struct Grid {
     tooltip: Option<GridTooltip>,
 }
 
+impl Default for Grid {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl Grid {
     pub fn new() -> Self {
         Self {
diff --git a/charming/src/component/grid3d.rs b/charming/src/component/grid3d.rs
index bb0e50b..eb6ed04 100644
--- a/charming/src/component/grid3d.rs
+++ b/charming/src/component/grid3d.rs
@@ -4,6 +4,12 @@ use serde::Serialize;
 #[serde(rename_all = "camelCase")]
 pub struct Grid3D {}
 
+impl Default for Grid3D {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl Grid3D {
     pub fn new() -> Self {
         Self {}
diff --git a/charming/src/component/legend.rs b/charming/src/component/legend.rs
index ae41371..5ab8788 100644
--- a/charming/src/component/legend.rs
+++ b/charming/src/component/legend.rs
@@ -171,6 +171,12 @@ pub struct Legend {
     data: Vec<LegendItem>,
 }
 
+impl Default for Legend {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl Legend {
     pub fn new() -> Self {
         Self {
diff --git a/charming/src/component/mod.rs b/charming/src/component/mod.rs
index 90e4aa6..5e664aa 100644
--- a/charming/src/component/mod.rs
+++ b/charming/src/component/mod.rs
@@ -26,12 +26,9 @@ pub use angle_axis::*;
 pub use aria::*;
 pub use axis::*;
 pub use axis3d::*;
-pub use brush::*;
-pub use calendar::*;
 pub use data_zoom::*;
 pub use geo::*;
 pub use geo_map::*;
-pub use graphic::*;
 pub use grid::*;
 pub use grid3d::*;
 pub use legend::*;
@@ -41,7 +38,6 @@ pub use polar_coordinate::*;
 pub use radar_coordinate::*;
 pub use radius_axis::*;
 pub use single_axis::*;
-pub use timeline::*;
 pub use title::*;
 pub use toolbox::*;
 pub use visual_map::*;
diff --git a/charming/src/component/parallel_axis.rs b/charming/src/component/parallel_axis.rs
index 6ee6ec9..f43f1f9 100644
--- a/charming/src/component/parallel_axis.rs
+++ b/charming/src/component/parallel_axis.rs
@@ -40,6 +40,12 @@ pub struct ParallelAxis {
     data: Vec<String>,
 }
 
+impl Default for ParallelAxis {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl ParallelAxis {
     pub fn new() -> Self {
         Self {
diff --git a/charming/src/component/parallel_coordinate.rs b/charming/src/component/parallel_coordinate.rs
index fe7b472..e1408e7 100644
--- a/charming/src/component/parallel_coordinate.rs
+++ b/charming/src/component/parallel_coordinate.rs
@@ -82,6 +82,12 @@ pub struct ParallelAxisDefault {
     data: Vec<String>,
 }
 
+impl Default for ParallelAxisDefault {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl ParallelAxisDefault {
     pub fn new() -> Self {
         Self {
@@ -264,6 +270,12 @@ pub struct ParallelCoordinate {
     parallel_axis_default: Option<ParallelAxisDefault>,
 }
 
+impl Default for ParallelCoordinate {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl ParallelCoordinate {
     pub fn new() -> Self {
         Self {
diff --git a/charming/src/component/polar_coordinate.rs b/charming/src/component/polar_coordinate.rs
index 737fe35..af91677 100644
--- a/charming/src/component/polar_coordinate.rs
+++ b/charming/src/component/polar_coordinate.rs
@@ -24,6 +24,12 @@ pub struct PolarCoordinate {
     radius: Option<CompositeValue>,
 }
 
+impl Default for PolarCoordinate {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl PolarCoordinate {
     pub fn new() -> Self {
         Self {
diff --git a/charming/src/component/radar_coordinate.rs b/charming/src/component/radar_coordinate.rs
index b16d25a..f1a911b 100644
--- a/charming/src/component/radar_coordinate.rs
+++ b/charming/src/component/radar_coordinate.rs
@@ -104,6 +104,12 @@ pub struct RadarAxisName {
     overflow: Option<String>,
 }
 
+impl Default for RadarAxisName {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl RadarAxisName {
     pub fn new() -> Self {
         Self {
@@ -307,6 +313,12 @@ pub struct RadarIndicator {
     color: Option<Color>,
 }
 
+impl Default for RadarIndicator {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl RadarIndicator {
     pub fn new() -> Self {
         Self {
@@ -417,6 +429,12 @@ pub struct RadarCoordinate {
     indicator: Vec<RadarIndicator>,
 }
 
+impl Default for RadarCoordinate {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl RadarCoordinate {
     pub fn new() -> Self {
         Self {
diff --git a/charming/src/component/radius_axis.rs b/charming/src/component/radius_axis.rs
index 6846fd1..8469e84 100644
--- a/charming/src/component/radius_axis.rs
+++ b/charming/src/component/radius_axis.rs
@@ -70,6 +70,12 @@ pub struct RadiusAxis {
     data: Vec<String>,
 }
 
+impl Default for RadiusAxis {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl RadiusAxis {
     pub fn new() -> Self {
         Self {
diff --git a/charming/src/component/single_axis.rs b/charming/src/component/single_axis.rs
index cd4e4c6..d4be86d 100644
--- a/charming/src/component/single_axis.rs
+++ b/charming/src/component/single_axis.rs
@@ -52,6 +52,12 @@ pub struct SingleAxis {
     max: Option<String>,
 }
 
+impl Default for SingleAxis {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl SingleAxis {
     pub fn new() -> Self {
         Self {
diff --git a/charming/src/component/title.rs b/charming/src/component/title.rs
index 1177a35..9ab3a1d 100644
--- a/charming/src/component/title.rs
+++ b/charming/src/component/title.rs
@@ -122,6 +122,12 @@ pub struct Title {
     shadow_offset_y: Option<f64>,
 }
 
+impl Default for Title {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl Title {
     pub fn new() -> Self {
         Self {
diff --git a/charming/src/component/toolbox.rs b/charming/src/component/toolbox.rs
index ff8d7c8..6010e40 100644
--- a/charming/src/component/toolbox.rs
+++ b/charming/src/component/toolbox.rs
@@ -27,6 +27,12 @@ pub struct SaveAsImage {
     background_color: Option<String>,
 }
 
+impl Default for SaveAsImage {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl SaveAsImage {
     pub fn new() -> Self {
         Self {
@@ -68,6 +74,12 @@ pub struct Restore {
     title: Option<String>,
 }
 
+impl Default for Restore {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl Restore {
     pub fn new() -> Self {
         Self {
@@ -100,6 +112,12 @@ pub struct DataView {
     read_only: Option<bool>,
 }
 
+impl Default for DataView {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl DataView {
     pub fn new() -> Self {
         Self {
@@ -157,6 +175,12 @@ pub struct MagicType {
     title: Option<String>,
 }
 
+impl Default for MagicType {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl MagicType {
     pub fn new() -> Self {
         Self {
@@ -194,6 +218,12 @@ pub struct Brush {
     type_: Vec<BrushType>,
 }
 
+impl Default for Brush {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl Brush {
     pub fn new() -> Self {
         Self { type_: vec![] }
@@ -212,6 +242,12 @@ pub struct ToolboxDataZoom {
     y_axis_index: Option<CompositeValue>,
 }
 
+impl Default for ToolboxDataZoom {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl ToolboxDataZoom {
     pub fn new() -> Self {
         Self { y_axis_index: None }
@@ -245,6 +281,12 @@ pub struct Feature {
     brush: Option<Brush>,
 }
 
+impl Default for Feature {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl Feature {
     pub fn new() -> Self {
         Self {
@@ -313,6 +355,12 @@ pub struct Toolbox {
     bottom: Option<CompositeValue>,
 }
 
+impl Default for Toolbox {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl Toolbox {
     pub fn new() -> Self {
         Self {
diff --git a/charming/src/component/visual_map.rs b/charming/src/component/visual_map.rs
index 9e3b8f6..5a78481 100644
--- a/charming/src/component/visual_map.rs
+++ b/charming/src/component/visual_map.rs
@@ -40,6 +40,12 @@ pub struct VisualMapPiece {
     color: Option<Color>,
 }
 
+impl Default for VisualMapPiece {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl VisualMapPiece {
     pub fn new() -> Self {
         Self {
@@ -126,6 +132,12 @@ pub struct VisualMapChannel {
     color: Vec<Color>,
 }
 
+impl Default for VisualMapChannel {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl VisualMapChannel {
     pub fn new() -> Self {
         Self { color: vec![] }
@@ -214,6 +226,12 @@ pub struct VisualMap {
     pieces: Option<Vec<VisualMapPiece>>,
 }
 
+impl Default for VisualMap {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl VisualMap {
     pub fn new() -> Self {
         Self {
diff --git a/charming/src/datatype/dataset.rs b/charming/src/datatype/dataset.rs
index f32c5c8..7bc2637 100644
--- a/charming/src/datatype/dataset.rs
+++ b/charming/src/datatype/dataset.rs
@@ -81,6 +81,12 @@ pub struct Transform {
     from_transform_result: Option<i32>,
 }
 
+impl Default for Transform {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl Transform {
     pub fn new() -> Self {
         Self {
@@ -142,6 +148,12 @@ impl Serialize for Dataset {
     }
 }
 
+impl Default for Dataset {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl Dataset {
     pub fn new() -> Self {
         Self {
diff --git a/charming/src/datatype/dimension.rs b/charming/src/datatype/dimension.rs
index e5af878..a4ef3fd 100644
--- a/charming/src/datatype/dimension.rs
+++ b/charming/src/datatype/dimension.rs
@@ -37,6 +37,12 @@ pub struct Dimension {
     display_name: Option<String>,
 }
 
+impl Default for Dimension {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl Dimension {
     pub fn new() -> Self {
         Self {
diff --git a/charming/src/element/anchor.rs b/charming/src/element/anchor.rs
index fccb902..ce3e06f 100644
--- a/charming/src/element/anchor.rs
+++ b/charming/src/element/anchor.rs
@@ -27,6 +27,12 @@ pub struct Anchor {
     item_style: Option<ItemStyle>,
 }
 
+impl Default for Anchor {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl Anchor {
     pub fn new() -> Self {
         Self {
diff --git a/charming/src/element/area_style.rs b/charming/src/element/area_style.rs
index 79472d1..2fedab0 100644
--- a/charming/src/element/area_style.rs
+++ b/charming/src/element/area_style.rs
@@ -23,6 +23,12 @@ pub struct AreaStyle {
     opacity: Option<f64>,
 }
 
+impl Default for AreaStyle {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl AreaStyle {
     pub fn new() -> Self {
         Self {
diff --git a/charming/src/element/axis_label.rs b/charming/src/element/axis_label.rs
index b7ce01b..9d2c4ba 100644
--- a/charming/src/element/axis_label.rs
+++ b/charming/src/element/axis_label.rs
@@ -27,6 +27,12 @@ pub struct AxisLabel {
     interval: Option<f64>,
 }
 
+impl Default for AxisLabel {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl AxisLabel {
     pub fn new() -> Self {
         Self {
diff --git a/charming/src/element/axis_line.rs b/charming/src/element/axis_line.rs
index d6d3657..138f2a4 100644
--- a/charming/src/element/axis_line.rs
+++ b/charming/src/element/axis_line.rs
@@ -49,6 +49,12 @@ pub struct AxisLineStyle {
     opacity: Option<f64>,
 }
 
+impl Default for AxisLineStyle {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl AxisLineStyle {
     pub fn new() -> Self {
         Self {
@@ -126,6 +132,12 @@ pub struct AxisLine {
     line_style: Option<AxisLineStyle>,
 }
 
+impl Default for AxisLine {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl AxisLine {
     pub fn new() -> Self {
         Self {
diff --git a/charming/src/element/axis_pointer.rs b/charming/src/element/axis_pointer.rs
index 1f6f535..b4607a4 100644
--- a/charming/src/element/axis_pointer.rs
+++ b/charming/src/element/axis_pointer.rs
@@ -39,6 +39,12 @@ pub struct AxisPointerLink {
     y_axis_name: Option<String>,
 }
 
+impl Default for AxisPointerLink {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl AxisPointerLink {
     pub fn new() -> Self {
         Self {
@@ -113,6 +119,12 @@ pub struct AxisPointer {
     link: Vec<AxisPointerLink>,
 }
 
+impl Default for AxisPointer {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl AxisPointer {
     pub fn new() -> Self {
         Self {
diff --git a/charming/src/element/axis_tick.rs b/charming/src/element/axis_tick.rs
index d7f276a..c7309b7 100644
--- a/charming/src/element/axis_tick.rs
+++ b/charming/src/element/axis_tick.rs
@@ -21,6 +21,12 @@ pub struct AxisTick {
     line_style: Option<LineStyle>,
 }
 
+impl Default for AxisTick {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl AxisTick {
     pub fn new() -> Self {
         Self {
diff --git a/charming/src/element/background.rs b/charming/src/element/background.rs
index 679aeec..213acac 100644
--- a/charming/src/element/background.rs
+++ b/charming/src/element/background.rs
@@ -24,6 +24,12 @@ pub struct BackgroundStyle {
     opacity: Option<f64>,
 }
 
+impl Default for BackgroundStyle {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl BackgroundStyle {
     pub fn new() -> Self {
         Self {
@@ -77,6 +83,12 @@ pub struct DataBackground {
     area_style: Option<AreaStyle>,
 }
 
+impl Default for DataBackground {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl DataBackground {
     pub fn new() -> Self {
         Self {
diff --git a/charming/src/element/blur.rs b/charming/src/element/blur.rs
index 9a6e5de..b56a9b1 100644
--- a/charming/src/element/blur.rs
+++ b/charming/src/element/blur.rs
@@ -12,6 +12,12 @@ pub struct Blur {
     item_style: Option<ItemStyle>,
 }
 
+impl Default for Blur {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl Blur {
     pub fn new() -> Self {
         Self {
diff --git a/charming/src/element/coordinate_tooltip.rs b/charming/src/element/coordinate_tooltip.rs
index d3553de..f5058ed 100644
--- a/charming/src/element/coordinate_tooltip.rs
+++ b/charming/src/element/coordinate_tooltip.rs
@@ -1,3 +1,5 @@
+#![allow(dead_code)]
+
 use serde::Serialize;
 
 use crate::datatype::CompositeValue;
diff --git a/charming/src/element/dimension_encode.rs b/charming/src/element/dimension_encode.rs
index faf273d..62fd370 100644
--- a/charming/src/element/dimension_encode.rs
+++ b/charming/src/element/dimension_encode.rs
@@ -21,6 +21,12 @@ pub struct DimensionEncode {
     tooltip: Vec<CompositeValue>,
 }
 
+impl Default for DimensionEncode {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl DimensionEncode {
     pub fn new() -> Self {
         Self {
diff --git a/charming/src/element/emphasis.rs b/charming/src/element/emphasis.rs
index 429b9d8..05292e5 100644
--- a/charming/src/element/emphasis.rs
+++ b/charming/src/element/emphasis.rs
@@ -31,6 +31,12 @@ pub struct Emphasis {
     label: Option<Label>,
 }
 
+impl Default for Emphasis {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl Emphasis {
     pub fn new() -> Self {
         Self {
diff --git a/charming/src/element/item_style.rs b/charming/src/element/item_style.rs
index 1a1ac68..d530cd0 100644
--- a/charming/src/element/item_style.rs
+++ b/charming/src/element/item_style.rs
@@ -35,6 +35,12 @@ pub struct ItemStyle {
     shadow_offset_y: Option<f64>,
 }
 
+impl Default for ItemStyle {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl ItemStyle {
     pub fn new() -> Self {
         Self {
diff --git a/charming/src/element/label.rs b/charming/src/element/label.rs
index 4f5a171..240aed6 100644
--- a/charming/src/element/label.rs
+++ b/charming/src/element/label.rs
@@ -101,6 +101,12 @@ pub struct Label {
     shadow_offset_y: Option<f64>,
 }
 
+impl Default for Label {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl Label {
     pub fn new() -> Self {
         Self {
@@ -249,6 +255,12 @@ pub struct LabelLine {
     line_style: Option<LineStyle>,
 }
 
+impl Default for LabelLine {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl LabelLine {
     pub fn new() -> Self {
         Self {
@@ -305,6 +317,12 @@ pub struct LabelLayout {
     rotate: Option<f64>,
 }
 
+impl Default for LabelLayout {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl LabelLayout {
     pub fn new() -> Self {
         Self {
diff --git a/charming/src/element/line_style.rs b/charming/src/element/line_style.rs
index ba86def..82c1fe1 100644
--- a/charming/src/element/line_style.rs
+++ b/charming/src/element/line_style.rs
@@ -30,6 +30,12 @@ pub struct LineStyle {
     curveness: Option<f64>,
 }
 
+impl Default for LineStyle {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl LineStyle {
     pub fn new() -> Self {
         Self {
diff --git a/charming/src/element/mark_area.rs b/charming/src/element/mark_area.rs
index 89cbc19..a4e47a4 100644
--- a/charming/src/element/mark_area.rs
+++ b/charming/src/element/mark_area.rs
@@ -15,6 +15,12 @@ pub struct MarkAreaData {
     y_axis: Option<String>,
 }
 
+impl Default for MarkAreaData {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl MarkAreaData {
     pub fn new() -> Self {
         Self {
@@ -62,6 +68,12 @@ pub struct MarkArea {
     data: Vec<(MarkAreaData, MarkAreaData)>,
 }
 
+impl Default for MarkArea {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl MarkArea {
     pub fn new() -> Self {
         Self {
diff --git a/charming/src/element/mark_line.rs b/charming/src/element/mark_line.rs
index 33f556f..86c511e 100644
--- a/charming/src/element/mark_line.rs
+++ b/charming/src/element/mark_line.rs
@@ -57,6 +57,12 @@ pub struct MarkLineData {
     label: Option<Label>,
 }
 
+impl Default for MarkLineData {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl MarkLineData {
     pub fn new() -> Self {
         Self {
@@ -165,6 +171,12 @@ pub struct MarkLine {
     data: Vec<MarkLineVariant>,
 }
 
+impl Default for MarkLine {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl MarkLine {
     pub fn new() -> Self {
         Self {
diff --git a/charming/src/element/mark_point.rs b/charming/src/element/mark_point.rs
index 46e79bc..e4fcc5a 100644
--- a/charming/src/element/mark_point.rs
+++ b/charming/src/element/mark_point.rs
@@ -39,6 +39,12 @@ pub struct MarkPointData {
     value: Option<f64>,
 }
 
+impl Default for MarkPointData {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl MarkPointData {
     pub fn new() -> Self {
         Self {
@@ -89,6 +95,12 @@ pub struct MarkPoint {
     data: Vec<MarkPointData>,
 }
 
+impl Default for MarkPoint {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl MarkPoint {
     pub fn new() -> Self {
         Self { data: vec![] }
diff --git a/charming/src/element/minor_split_line.rs b/charming/src/element/minor_split_line.rs
index 13ede9d..aecc59a 100644
--- a/charming/src/element/minor_split_line.rs
+++ b/charming/src/element/minor_split_line.rs
@@ -9,6 +9,12 @@ pub struct MinorSplitLine {
     line_style: Option<LineStyle>,
 }
 
+impl Default for MinorSplitLine {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl MinorSplitLine {
     pub fn new() -> MinorSplitLine {
         MinorSplitLine {
diff --git a/charming/src/element/minor_tick.rs b/charming/src/element/minor_tick.rs
index ff2dddb..9972ec1 100644
--- a/charming/src/element/minor_tick.rs
+++ b/charming/src/element/minor_tick.rs
@@ -18,6 +18,12 @@ pub struct MinorTick {
     line_style: Option<LineStyle>,
 }
 
+impl Default for MinorTick {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl MinorTick {
     pub fn new() -> MinorTick {
         MinorTick {
diff --git a/charming/src/element/pointer.rs b/charming/src/element/pointer.rs
index ecec81a..cc6cab5 100644
--- a/charming/src/element/pointer.rs
+++ b/charming/src/element/pointer.rs
@@ -30,6 +30,12 @@ pub struct Pointer {
     item_style: Option<ItemStyle>,
 }
 
+impl Default for Pointer {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl Pointer {
     pub fn new() -> Self {
         Self {
diff --git a/charming/src/element/scale_limit.rs b/charming/src/element/scale_limit.rs
index 608f47f..b145355 100644
--- a/charming/src/element/scale_limit.rs
+++ b/charming/src/element/scale_limit.rs
@@ -10,6 +10,12 @@ pub struct ScaleLimit {
     max: Option<f64>,
 }
 
+impl Default for ScaleLimit {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl ScaleLimit {
     pub fn new() -> Self {
         Self {
diff --git a/charming/src/element/select.rs b/charming/src/element/select.rs
index 2a971e0..e6b435f 100644
--- a/charming/src/element/select.rs
+++ b/charming/src/element/select.rs
@@ -15,6 +15,12 @@ pub struct Select {
     item_style: Option<ItemStyle>,
 }
 
+impl Default for Select {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl Select {
     pub fn new() -> Self {
         Self {
diff --git a/charming/src/element/split_area.rs b/charming/src/element/split_area.rs
index 518d8c5..95f487d 100644
--- a/charming/src/element/split_area.rs
+++ b/charming/src/element/split_area.rs
@@ -7,6 +7,12 @@ pub struct SplitArea {
     show: Option<bool>,
 }
 
+impl Default for SplitArea {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl SplitArea {
     pub fn new() -> Self {
         Self { show: None }
diff --git a/charming/src/element/split_line.rs b/charming/src/element/split_line.rs
index a2e8a71..66455f7 100644
--- a/charming/src/element/split_line.rs
+++ b/charming/src/element/split_line.rs
@@ -18,6 +18,12 @@ pub struct SplitLine {
     length: Option<f64>,
 }
 
+impl Default for SplitLine {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl SplitLine {
     pub fn new() -> Self {
         Self {
diff --git a/charming/src/element/text_style.rs b/charming/src/element/text_style.rs
index f15af21..1ab66a0 100644
--- a/charming/src/element/text_style.rs
+++ b/charming/src/element/text_style.rs
@@ -30,6 +30,12 @@ pub struct TextStyle {
     padding: Option<[f64; 4]>,
 }
 
+impl Default for TextStyle {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl TextStyle {
     pub fn new() -> Self {
         Self {
diff --git a/charming/src/element/tooltip.rs b/charming/src/element/tooltip.rs
index 9f45a86..7102386 100644
--- a/charming/src/element/tooltip.rs
+++ b/charming/src/element/tooltip.rs
@@ -52,6 +52,12 @@ pub struct Tooltip {
     border_width: Option<f64>,
 }
 
+impl Default for Tooltip {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl Tooltip {
     pub fn new() -> Self {
         Self {
diff --git a/charming/src/lib.rs b/charming/src/lib.rs
index 2911ed9..3045101 100644
--- a/charming/src/lib.rs
+++ b/charming/src/lib.rs
@@ -1,3 +1,4 @@
+#![allow(clippy::to_string_trait_impl)]
 #![cfg_attr(docsrs, feature(doc_cfg))]
 /*!
 Charming is a powerful and versatile chart rendering library for Rust that
@@ -39,31 +40,29 @@ use charming::{
     Chart, ImageRenderer
 };
 
-fn main() {
-    let chart = Chart::new()
-        .legend(Legend::new().top("bottom"))
-        .series(
-            Pie::new()
-                .name("Nightingale Chart")
-                .rose_type(PieRoseType::Radius)
-                .radius(vec!["50", "250"])
-                .center(vec!["50%", "50%"])
-                .item_style(ItemStyle::new().border_radius(8))
-                .data(vec![
-                    (40.0, "rose 1"),
-                    (38.0, "rose 2"),
-                    (32.0, "rose 3"),
-                    (30.0, "rose 4"),
-                    (28.0, "rose 5"),
-                    (26.0, "rose 6"),
-                    (22.0, "rose 7"),
-                    (18.0, "rose 8"),
-                ]),
-        );
-
-    let mut renderer = ImageRenderer::new(1000, 800);
-    renderer.save(&chart, "/tmp/nightingale.svg");
-}
+let chart = Chart::new()
+    .legend(Legend::new().top("bottom"))
+    .series(
+        Pie::new()
+            .name("Nightingale Chart")
+            .rose_type(PieRoseType::Radius)
+            .radius(vec!["50", "250"])
+            .center(vec!["50%", "50%"])
+            .item_style(ItemStyle::new().border_radius(8))
+            .data(vec![
+                (40.0, "rose 1"),
+                (38.0, "rose 2"),
+                (32.0, "rose 3"),
+                (30.0, "rose 4"),
+                (28.0, "rose 5"),
+                (26.0, "rose 6"),
+                (22.0, "rose 7"),
+                (18.0, "rose 8"),
+            ]),
+    );
+
+let mut renderer = ImageRenderer::new(1000, 800);
+renderer.save(&chart, "/tmp/nightingale.svg");
 ```
 
 ## Themes
@@ -330,6 +329,12 @@ pub struct Chart {
     geo_maps: Vec<GeoMap>,
 }
 
+impl Default for Chart {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl Chart {
     pub fn new() -> Self {
         Self {
@@ -528,6 +533,11 @@ pub enum EchartsError {
 impl std::error::Error for EchartsError {}
 impl std::fmt::Display for EchartsError {
     fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
-        write!(f, "{}", self)
+        match self {
+            Self::HtmlRenderingError(msg) => write!(f, "HTML rendering error: {}", msg),
+            Self::ImageRenderingError(msg) => write!(f, "Image rendering error: {}", msg),
+            Self::JsRuntimeError(msg) => write!(f, "JavaScript runtime error: {}", msg),
+            Self::WasmError(msg) => write!(f, "WebAssembly runtime error: {}", msg),
+        }
     }
 }
diff --git a/charming/src/series/bar.rs b/charming/src/series/bar.rs
index 3e13714..3013f58 100644
--- a/charming/src/series/bar.rs
+++ b/charming/src/series/bar.rs
@@ -71,6 +71,12 @@ pub struct Bar {
     data: DataFrame,
 }
 
+impl Default for Bar {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl Bar {
     pub fn new() -> Self {
         Self {
diff --git a/charming/src/series/bar3d.rs b/charming/src/series/bar3d.rs
index 30a0f11..82597fd 100644
--- a/charming/src/series/bar3d.rs
+++ b/charming/src/series/bar3d.rs
@@ -34,6 +34,12 @@ pub struct Bar3d {
     #[serde(skip_serializing_if = "Vec::is_empty")]
     data: DataFrame,
 }
+impl Default for Bar3d {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl Bar3d {
     pub fn new() -> Self {
         Self {
diff --git a/charming/src/series/boxplot.rs b/charming/src/series/boxplot.rs
index bb0f44d..ee36ae0 100644
--- a/charming/src/series/boxplot.rs
+++ b/charming/src/series/boxplot.rs
@@ -30,6 +30,12 @@ pub struct Boxplot {
     dataset_index: Option<u64>,
 }
 
+impl Default for Boxplot {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl Boxplot {
     pub fn new() -> Self {
         Boxplot {
diff --git a/charming/src/series/candlestick.rs b/charming/src/series/candlestick.rs
index 8d34e57..29420f0 100644
--- a/charming/src/series/candlestick.rs
+++ b/charming/src/series/candlestick.rs
@@ -30,6 +30,12 @@ pub struct Candlestick {
     data: DataFrame,
 }
 
+impl Default for Candlestick {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl Candlestick {
     pub fn new() -> Self {
         Self {
diff --git a/charming/src/series/custom.rs b/charming/src/series/custom.rs
index fcd64f2..c5c1178 100644
--- a/charming/src/series/custom.rs
+++ b/charming/src/series/custom.rs
@@ -67,6 +67,12 @@ pub struct Custom {
     data: DataFrame,
 }
 
+impl Default for Custom {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl Custom {
     pub fn new() -> Self {
         Self {
diff --git a/charming/src/series/effect_scatter.rs b/charming/src/series/effect_scatter.rs
index cadd2e3..64335d5 100644
--- a/charming/src/series/effect_scatter.rs
+++ b/charming/src/series/effect_scatter.rs
@@ -47,6 +47,12 @@ pub struct RippleEffect {
     brush_type: Option<RippleEffectBrushType>,
 }
 
+impl Default for RippleEffect {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl RippleEffect {
     pub fn new() -> Self {
         Self {
@@ -160,6 +166,12 @@ pub struct EffectScatter {
     data: DataFrame,
 }
 
+impl Default for EffectScatter {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl EffectScatter {
     pub fn new() -> Self {
         Self {
diff --git a/charming/src/series/funnel.rs b/charming/src/series/funnel.rs
index 2f0a39c..9f46ffe 100644
--- a/charming/src/series/funnel.rs
+++ b/charming/src/series/funnel.rs
@@ -89,6 +89,12 @@ pub struct Funnel {
     data: DataFrame,
 }
 
+impl Default for Funnel {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl Funnel {
     pub fn new() -> Self {
         Self {
diff --git a/charming/src/series/gauge.rs b/charming/src/series/gauge.rs
index 8f84c53..1c0454a 100644
--- a/charming/src/series/gauge.rs
+++ b/charming/src/series/gauge.rs
@@ -39,6 +39,12 @@ pub struct GaugeDetail {
     formatter: Option<Formatter>,
 }
 
+impl Default for GaugeDetail {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl GaugeDetail {
     pub fn new() -> Self {
         Self {
@@ -110,6 +116,12 @@ pub struct GaugeTitle {
     offset_center: Option<(String, String)>,
 }
 
+impl Default for GaugeTitle {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl GaugeTitle {
     pub fn new() -> Self {
         Self {
@@ -151,6 +163,12 @@ pub struct GaugeProgress {
     item_style: Option<ItemStyle>,
 }
 
+impl Default for GaugeProgress {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl GaugeProgress {
     pub fn new() -> Self {
         Self {
@@ -273,6 +291,12 @@ pub struct Gauge {
     data: DataFrame,
 }
 
+impl Default for Gauge {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl Gauge {
     pub fn new() -> Self {
         Self {
diff --git a/charming/src/series/graph.rs b/charming/src/series/graph.rs
index 6d157d8..3fd0bca 100644
--- a/charming/src/series/graph.rs
+++ b/charming/src/series/graph.rs
@@ -9,6 +9,12 @@ pub struct GraphLayoutCircular {
     rotate_label: Option<bool>,
 }
 
+impl Default for GraphLayoutCircular {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl GraphLayoutCircular {
     pub fn new() -> Self {
         Self { rotate_label: None }
@@ -39,6 +45,12 @@ pub struct GraphLayoutForce {
     friction: Option<f64>,
 }
 
+impl Default for GraphLayoutForce {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl GraphLayoutForce {
     pub fn new() -> Self {
         Self {
@@ -114,6 +126,12 @@ pub struct GraphNodeLabel {
     font_size: Option<u64>,
 }
 
+impl Default for GraphNodeLabel {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl GraphNodeLabel {
     pub fn new() -> Self {
         Self {
@@ -259,6 +277,12 @@ pub struct Graph {
     edge_symbol: Option<(String, String)>,
 }
 
+impl Default for Graph {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl Graph {
     pub fn new() -> Self {
         Self {
diff --git a/charming/src/series/heatmap.rs b/charming/src/series/heatmap.rs
index 9825dd3..bae05c2 100644
--- a/charming/src/series/heatmap.rs
+++ b/charming/src/series/heatmap.rs
@@ -63,6 +63,12 @@ pub struct Heatmap {
     data: Vec<DataFrame>,
 }
 
+impl Default for Heatmap {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl Heatmap {
     pub fn new() -> Self {
         Self {
diff --git a/charming/src/series/line.rs b/charming/src/series/line.rs
index 33be67c..aff6409 100644
--- a/charming/src/series/line.rs
+++ b/charming/src/series/line.rs
@@ -78,6 +78,12 @@ pub struct Line {
     data: DataFrame,
 }
 
+impl Default for Line {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl Line {
     pub fn new() -> Self {
         Self {
diff --git a/charming/src/series/lines.rs b/charming/src/series/lines.rs
index 0ce69d3..84eee6a 100644
--- a/charming/src/series/lines.rs
+++ b/charming/src/series/lines.rs
@@ -1,3 +1,5 @@
+#![allow(dead_code)]
+
 use serde::Serialize;
 
 use crate::element::{ColorBy, CoordinateSystem, Emphasis, Label, LabelLayout, LineStyle, Symbol};
diff --git a/charming/src/series/mod.rs b/charming/src/series/mod.rs
index 0a77799..c56981a 100644
--- a/charming/src/series/mod.rs
+++ b/charming/src/series/mod.rs
@@ -1,3 +1,5 @@
+#![allow(clippy::large_enum_variant)]
+
 use serde::Serialize;
 
 pub mod bar;
diff --git a/charming/src/series/parallel.rs b/charming/src/series/parallel.rs
index 5768fdd..0754b5d 100644
--- a/charming/src/series/parallel.rs
+++ b/charming/src/series/parallel.rs
@@ -64,6 +64,12 @@ pub struct Parallel {
     data: DataFrame,
 }
 
+impl Default for Parallel {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl Parallel {
     pub fn new() -> Self {
         Self {
diff --git a/charming/src/series/pictorial_bar.rs b/charming/src/series/pictorial_bar.rs
index 092e9f1..f613980 100644
--- a/charming/src/series/pictorial_bar.rs
+++ b/charming/src/series/pictorial_bar.rs
@@ -62,6 +62,12 @@ pub struct PictorialBar {
     data: Vec<DataFrame>,
 }
 
+impl Default for PictorialBar {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl PictorialBar {
     pub fn new() -> Self {
         PictorialBar {
diff --git a/charming/src/series/pie.rs b/charming/src/series/pie.rs
index 92aa416..f3bf450 100644
--- a/charming/src/series/pie.rs
+++ b/charming/src/series/pie.rs
@@ -79,6 +79,12 @@ pub struct Pie {
     data: DataFrame,
 }
 
+impl Default for Pie {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl Pie {
     pub fn new() -> Self {
         Pie {
diff --git a/charming/src/series/radar.rs b/charming/src/series/radar.rs
index 2141dd7..64e0883 100644
--- a/charming/src/series/radar.rs
+++ b/charming/src/series/radar.rs
@@ -51,6 +51,12 @@ pub struct Radar {
     emphasis: Option<Emphasis>,
 }
 
+impl Default for Radar {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl Radar {
     pub fn new() -> Self {
         Self {
diff --git a/charming/src/series/sankey.rs b/charming/src/series/sankey.rs
index 6f71578..a14d22b 100644
--- a/charming/src/series/sankey.rs
+++ b/charming/src/series/sankey.rs
@@ -150,6 +150,12 @@ pub struct Sankey {
     data: Vec<SankeyNode>,
 }
 
+impl Default for Sankey {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl Sankey {
     pub fn new() -> Self {
         Sankey {
diff --git a/charming/src/series/scatter.rs b/charming/src/series/scatter.rs
index f3e43f4..7fb09ec 100644
--- a/charming/src/series/scatter.rs
+++ b/charming/src/series/scatter.rs
@@ -63,6 +63,12 @@ pub struct Scatter {
     data: DataFrame,
 }
 
+impl Default for Scatter {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl Scatter {
     pub fn new() -> Self {
         Self {
diff --git a/charming/src/series/sunburst.rs b/charming/src/series/sunburst.rs
index 5723779..64855f5 100644
--- a/charming/src/series/sunburst.rs
+++ b/charming/src/series/sunburst.rs
@@ -18,6 +18,12 @@ pub struct SunburstLevel {
     label: Option<Label>,
 }
 
+impl Default for SunburstLevel {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl SunburstLevel {
     pub fn new() -> Self {
         Self {
@@ -148,6 +154,12 @@ pub struct Sunburst {
     data: Vec<SunburstNode>,
 }
 
+impl Default for Sunburst {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl Sunburst {
     pub fn new() -> Self {
         Self {
diff --git a/charming/src/series/theme_river.rs b/charming/src/series/theme_river.rs
index d614099..742453d 100644
--- a/charming/src/series/theme_river.rs
+++ b/charming/src/series/theme_river.rs
@@ -93,6 +93,12 @@ pub struct ThemeRiver {
     data: Vec<ThemeRiverData>,
 }
 
+impl Default for ThemeRiver {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl ThemeRiver {
     pub fn new() -> Self {
         Self {
diff --git a/charming/src/series/tree.rs b/charming/src/series/tree.rs
index c8f0242..d92dbe7 100644
--- a/charming/src/series/tree.rs
+++ b/charming/src/series/tree.rs
@@ -38,6 +38,12 @@ pub struct TreeLeaves {
     label: Option<Label>,
 }
 
+impl Default for TreeLeaves {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl TreeLeaves {
     pub fn new() -> Self {
         Self { label: None }
@@ -178,6 +184,12 @@ pub struct Tree {
     data: Vec<TreeNode>,
 }
 
+impl Default for Tree {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl Tree {
     pub fn new() -> Self {
         Self {
diff --git a/charming/src/series/treemap.rs b/charming/src/series/treemap.rs
index 700a898..3a27b03 100644
--- a/charming/src/series/treemap.rs
+++ b/charming/src/series/treemap.rs
@@ -51,6 +51,12 @@ pub struct Treemap {
     emphasis: Option<Emphasis>,
 }
 
+impl Default for Treemap {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl Treemap {
     pub fn new() -> Self {
         Treemap {
diff --git a/charming/src/theme/mod.rs b/charming/src/theme/mod.rs
index 259dc7b..095bffe 100644
--- a/charming/src/theme/mod.rs
+++ b/charming/src/theme/mod.rs
@@ -1,4 +1,6 @@
+#[derive(Default)]
 pub enum Theme {
+    #[default]
     Default,
     Dark,
     Vintage,
@@ -40,9 +42,3 @@ impl Theme {
         }
     }
 }
-
-impl Default for Theme {
-    fn default() -> Self {
-        Theme::Default
-    }
-}
diff --git a/gallery/src/candlestick/shanghai_index.rs b/gallery/src/candlestick/shanghai_index.rs
index e4faa97..f0f75a8 100644
--- a/gallery/src/candlestick/shanghai_index.rs
+++ b/gallery/src/candlestick/shanghai_index.rs
@@ -93,7 +93,7 @@ pub fn chart() -> Chart {
         )
 }
 
-fn calculate_ma(day_count: usize, data: &Vec<Vec<f64>>) -> Vec<CompositeValue> {
+fn calculate_ma(day_count: usize, data: &[Vec<f64>]) -> Vec<CompositeValue> {
     let mut result = vec![];
     for i in 0..data.len() {
         if i < day_count {
diff --git a/gallery/src/lib.rs b/gallery/src/lib.rs
index d7cc1d3..b05114a 100644
--- a/gallery/src/lib.rs
+++ b/gallery/src/lib.rs
@@ -1,3 +1,5 @@
+#![allow(clippy::type_complexity)]
+
 use charming::Chart;
 use lazy_static::lazy_static;
 use std::collections::BTreeMap;
diff --git a/gallery/src/line/rainfall.rs b/gallery/src/line/rainfall.rs
index 0a45a81..426e265 100644
--- a/gallery/src/line/rainfall.rs
+++ b/gallery/src/line/rainfall.rs
@@ -1,3 +1,5 @@
+#![allow(clippy::approx_constant)]
+
 use charming::{
     component::{
         Axis, DataZoom, DataZoomType, Feature, Grid, Legend, Restore, SaveAsImage, Title, Toolbox,
diff --git a/gallery/src/line/rainfall_vs_evaporation.rs b/gallery/src/line/rainfall_vs_evaporation.rs
index f49f49e..d3f9fd4 100644
--- a/gallery/src/line/rainfall_vs_evaporation.rs
+++ b/gallery/src/line/rainfall_vs_evaporation.rs
@@ -1,3 +1,5 @@
+#![allow(clippy::approx_constant)]
+
 use std::vec;
 
 use charming::{
diff --git a/gallery/src/line/two_value_axes_in_polar.rs b/gallery/src/line/two_value_axes_in_polar.rs
index 3b4a328..5b1f1a0 100644
--- a/gallery/src/line/two_value_axes_in_polar.rs
+++ b/gallery/src/line/two_value_axes_in_polar.rs
@@ -7,7 +7,6 @@ use charming::{
 
 pub fn chart() -> Chart {
     let data = (0..=360)
-        .into_iter()
         .map(|i| {
             let t = i as f64 / 180.0 * std::f64::consts::PI;
             let r = (2.0 * t).sin() * (2.0 * t).cos();
diff --git a/gallery/src/radar/proportion_of_browsers.rs b/gallery/src/radar/proportion_of_browsers.rs
index aa97f13..da9754d 100644
--- a/gallery/src/radar/proportion_of_browsers.rs
+++ b/gallery/src/radar/proportion_of_browsers.rs
@@ -37,12 +37,10 @@ pub fn chart() -> Chart {
         )
         .tooltip(Tooltip::new().trigger(Trigger::Item))
         .legend(
-            Legend::new().type_(LegendType::Scroll).bottom("10").data(
-                (1..=28)
-                    .into_iter()
-                    .map(|i| (i + 2000).to_string())
-                    .collect::<Vec<_>>(),
-            ),
+            Legend::new()
+                .type_(LegendType::Scroll)
+                .bottom("10")
+                .data((1..=28).map(|i| (i + 2000).to_string()).collect::<Vec<_>>()),
         )
         .visual_map(
             VisualMap::new()
diff --git a/gallery/src/theme_river/theme_river_lastfm.rs b/gallery/src/theme_river/theme_river_lastfm.rs
index b293cdb..f7799d4 100644
--- a/gallery/src/theme_river/theme_river_lastfm.rs
+++ b/gallery/src/theme_river/theme_river_lastfm.rs
@@ -95,13 +95,12 @@ pub fn chart() -> Chart {
 
     let iter = labels.iter().zip(raw_data.iter());
     let data = iter
-        .map(|(name, data)| {
+        .flat_map(|(name, data)| {
             data.iter()
                 .enumerate()
                 .map(|(idx, v)| (idx as f64, *v, *name))
                 .collect::<Vec<_>>()
         })
-        .flatten()
         .collect();
 
     Chart::new()