Fix lints by clippy

graphics/src/gradient/linear.rs

@@ -36,12 +36,9 @@ pub enum Position {
     },
 }
 
-impl Into<Position> for (Point, Point) {
-    fn into(self) -> Position {
-        Position::Absolute {
-            start: self.0,
-            end: self.1,
-        }
+impl From<(Point, Point)> for Position {
+    fn from((start, end): (Point, Point)) -> Self {
+        Self::Absolute { start, end }
     }
 }
 

graphics/src/layer/mesh.rs

@@ -28,13 +28,9 @@ pub enum Style {
     Gradient(Gradient),
 }
 
-impl<'a> Into<Style> for Gradient {
-    fn into(self) -> Style {
-        match self {
-            Gradient::Linear(linear) => {
-                Style::Gradient(Gradient::Linear(linear))
-            }
-        }
+impl From<Gradient> for Style {
+    fn from(gradient: Gradient) -> Self {
+        Self::Gradient(gradient)
     }
 }
 

graphics/src/transformation.rs

@@ -52,8 +52,8 @@ impl From<Transformation> for [f32; 16] {
     }
 }
 
-impl Into<Mat4> for Transformation {
-    fn into(self) -> Mat4 {
-        self.0
+impl From<Transformation> for Mat4 {
+    fn from(transformation: Transformation) -> Self {
+        transformation.0
     }
 }

graphics/src/widget/canvas/fill.rs

@@ -42,10 +42,10 @@ impl<'a> From<Color> for Fill<'a> {
     }
 }
 
-impl<'a> Into<Fill<'a>> for &'a Gradient {
-    fn into(self) -> Fill<'a> {
+impl<'a> From<&'a Gradient> for Fill<'a> {
+    fn from(gradient: &'a Gradient) -> Self {
         Fill {
-            style: Style::Gradient(self),
+            style: Style::Gradient(gradient),
             ..Default::default()
         }
     }