diff --git a/README-zh.md b/README-zh.md
index eb0a688..d67640c 100644
--- a/README-zh.md
+++ b/README-zh.md
@@ -207,6 +207,6 @@ get_or_try_init_fonts(vec![&buf]));
 
 ## 开源协议声明
 
-This project is licensed under the [Apache License 2.0 license].
+This project is licensed under the [MPL-2.0 license].
 
-[Apache License 2.0 license]: https://github.com/vicanso/charts-rs/blob/main/LICENSE
+[MPL-2.0 license]: https://github.com/vicanso/charts-rs/blob/main/LICENSE
diff --git a/README.md b/README.md
index bdbdcc7..8f2f28f 100644
--- a/README.md
+++ b/README.md
@@ -208,6 +208,6 @@ get_or_try_init_fonts(vec![&buf]));
 
 ## License
 
-This project is licensed under the [Apache License 2.0 license].
+This project is licensed under the [MPL-2.0 license].
 
-[Apache License 2.0 license]: https://github.com/vicanso/charts-rs/blob/main/LICENSE
+[MPL-2.0 license]: https://github.com/vicanso/charts-rs/blob/main/LICENSE
diff --git a/src/charts.rs b/src/charts.rs
index 2daaafa..6b196c4 100644
--- a/src/charts.rs
+++ b/src/charts.rs
@@ -1,3 +1,7 @@
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
 mod bar_chart;
 mod candlestick_chart;
 mod canvas;
diff --git a/src/charts/bar_chart.rs b/src/charts/bar_chart.rs
index 4305b07..a09b6b2 100644
--- a/src/charts/bar_chart.rs
+++ b/src/charts/bar_chart.rs
@@ -1,3 +1,7 @@
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
 use super::canvas;
 use super::color::*;
 use super::common::*;
diff --git a/src/charts/candlestick_chart.rs b/src/charts/candlestick_chart.rs
index 74d9293..7fea89b 100644
--- a/src/charts/candlestick_chart.rs
+++ b/src/charts/candlestick_chart.rs
@@ -1,3 +1,7 @@
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
 use super::canvas;
 use super::color::*;
 use super::common::*;
diff --git a/src/charts/canvas.rs b/src/charts/canvas.rs
index 51733d6..6a98205 100644
--- a/src/charts/canvas.rs
+++ b/src/charts/canvas.rs
@@ -1,3 +1,7 @@
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
 use super::component::{
     generate_svg, Arrow, Axis, Bubble, Circle, Component, Grid, Legend, Line, Pie, Polygon,
     Polyline, Rect, SmoothLine, SmoothLineFill, StraightLine, StraightLineFill, Text, LEGEND_WIDTH,
diff --git a/src/charts/color.rs b/src/charts/color.rs
index 65472be..3565117 100644
--- a/src/charts/color.rs
+++ b/src/charts/color.rs
@@ -1,3 +1,7 @@
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
 use serde::{Deserialize, Serialize};
 use substring::Substring;
 
diff --git a/src/charts/common.rs b/src/charts/common.rs
index 1282621..372539e 100644
--- a/src/charts/common.rs
+++ b/src/charts/common.rs
@@ -1,3 +1,7 @@
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
 use super::{Box, Color};
 use crate::Point;
 use serde::{Deserialize, Serialize};
diff --git a/src/charts/component.rs b/src/charts/component.rs
index fc3d7f3..163df25 100644
--- a/src/charts/component.rs
+++ b/src/charts/component.rs
@@ -1,3 +1,7 @@
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
 use serde::{Deserialize, Serialize};
 use snafu::{ResultExt, Snafu};
 use std::fmt;
diff --git a/src/charts/encoder.rs b/src/charts/encoder.rs
index 07af33f..f18533d 100644
--- a/src/charts/encoder.rs
+++ b/src/charts/encoder.rs
@@ -1,3 +1,7 @@
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
 use image::ImageFormat;
 use once_cell::sync::OnceCell;
 use resvg::{tiny_skia, usvg};
diff --git a/src/charts/font.rs b/src/charts/font.rs
index 9a1536d..2f03734 100644
--- a/src/charts/font.rs
+++ b/src/charts/font.rs
@@ -1,3 +1,7 @@
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
 use super::util::*;
 use fontdue::layout::{CoordinateSystem, Layout, TextStyle};
 use fontdue::Font;
diff --git a/src/charts/heatmap_chart.rs b/src/charts/heatmap_chart.rs
index 1802ae9..6d9cd76 100644
--- a/src/charts/heatmap_chart.rs
+++ b/src/charts/heatmap_chart.rs
@@ -1,3 +1,7 @@
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
 use super::canvas;
 use super::color::*;
 use super::common::*;
diff --git a/src/charts/horizontal_bar_chart.rs b/src/charts/horizontal_bar_chart.rs
index 1b4024f..e83f40a 100644
--- a/src/charts/horizontal_bar_chart.rs
+++ b/src/charts/horizontal_bar_chart.rs
@@ -1,3 +1,7 @@
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
 use super::canvas;
 use super::color::*;
 use super::common::*;
diff --git a/src/charts/line_chart.rs b/src/charts/line_chart.rs
index 22a2bea..8cd6f7a 100644
--- a/src/charts/line_chart.rs
+++ b/src/charts/line_chart.rs
@@ -1,3 +1,7 @@
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
 use super::canvas;
 use super::color::*;
 use super::common::*;
diff --git a/src/charts/multi_chart.rs b/src/charts/multi_chart.rs
index 9f93fc8..16cf0f7 100644
--- a/src/charts/multi_chart.rs
+++ b/src/charts/multi_chart.rs
@@ -1,4 +1,6 @@
-use substring::Substring;
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
 use super::canvas;
 use super::component::generate_svg;
@@ -9,6 +11,7 @@ use super::{
     ScatterChart, TableChart,
 };
 use super::{Box, Color};
+use substring::Substring;
 
 pub enum ChildChart {
     Bar(BarChart, Option<(f32, f32)>),
diff --git a/src/charts/params.rs b/src/charts/params.rs
index a0425cb..3e4db50 100644
--- a/src/charts/params.rs
+++ b/src/charts/params.rs
@@ -1,10 +1,12 @@
-use std::sync::Arc;
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
+use super::{Align, Box, Color, LegendCategory, Series, SeriesCategory, Theme, YAxisConfig};
 use crate::{
     MarkLine, MarkLineCategory, MarkPoint, MarkPointCategory, Position, Symbol, NIL_VALUE,
 };
-
-use super::{Align, Box, Color, LegendCategory, Series, SeriesCategory, Theme, YAxisConfig};
+use std::sync::Arc;
 
 /// Gets bool value from serde json.
 pub(crate) fn get_bool_from_value(value: &serde_json::Value, key: &str) -> Option<bool> {
diff --git a/src/charts/path.rs b/src/charts/path.rs
index f58588c..87ffa69 100644
--- a/src/charts/path.rs
+++ b/src/charts/path.rs
@@ -1,3 +1,7 @@
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
 use super::util::*;
 use std::fmt;
 
diff --git a/src/charts/pie_chart.rs b/src/charts/pie_chart.rs
index cdcd0a0..e66d1dd 100644
--- a/src/charts/pie_chart.rs
+++ b/src/charts/pie_chart.rs
@@ -1,3 +1,7 @@
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
 use super::canvas;
 use super::color::*;
 use super::common::*;
@@ -10,7 +14,6 @@ use crate::charts::measure_text_width_family;
 use charts_rs_derive::Chart;
 use core::f32;
 use std::sync::Arc;
-use std::u8;
 
 #[derive(Clone, Debug, Default, Chart)]
 pub struct PieChart {
diff --git a/src/charts/radar_chart.rs b/src/charts/radar_chart.rs
index d2637d1..f4f9953 100644
--- a/src/charts/radar_chart.rs
+++ b/src/charts/radar_chart.rs
@@ -1,3 +1,7 @@
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
 use super::canvas;
 use super::color::*;
 use super::common::*;
diff --git a/src/charts/scatter_chart.rs b/src/charts/scatter_chart.rs
index f8aa418..802f780 100644
--- a/src/charts/scatter_chart.rs
+++ b/src/charts/scatter_chart.rs
@@ -1,3 +1,7 @@
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
 use super::canvas;
 use super::color::*;
 use super::common::*;
diff --git a/src/charts/table_chart.rs b/src/charts/table_chart.rs
index 21ba63d..0632362 100644
--- a/src/charts/table_chart.rs
+++ b/src/charts/table_chart.rs
@@ -1,3 +1,7 @@
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
 use super::canvas;
 use super::color::*;
 use super::common::*;
diff --git a/src/charts/theme.rs b/src/charts/theme.rs
index 9c0b24c..05eec0f 100644
--- a/src/charts/theme.rs
+++ b/src/charts/theme.rs
@@ -1,3 +1,7 @@
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
 use super::color::Color;
 use super::common::Align;
 use super::font::DEFAULT_FONT_FAMILY;
diff --git a/src/charts/util.rs b/src/charts/util.rs
index 78950a1..99865a3 100644
--- a/src/charts/util.rs
+++ b/src/charts/util.rs
@@ -1,3 +1,7 @@
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
 use serde::{Deserialize, Serialize};
 use std::fmt;
 use substring::Substring;
@@ -289,12 +293,10 @@ pub fn get_quadrant(cx: f32, cy: f32, point: &Point) -> u8 {
         } else {
             1
         }
+    } else if point.y > cy {
+        3
     } else {
-        if point.y > cy {
-            3
-        } else {
-            2
-        }
+        2
     }
 }
 
diff --git a/src/lib.rs b/src/lib.rs
index a67c770..56dcb9a 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,3 +1,7 @@
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
 //! Charts support multi charts: bar chart, horizontal bar chart,
 //! line chart, pie chart, radar chart and table.
 //!