Adds linear gradient support to 2D meshes in the canvas widget.

graphics/src/gradient.rs

@@ -0,0 +1,23 @@
+//! For creating a Gradient.
+
+use iced_native::Color;
+use crate::widget::canvas::gradient::Linear;
+
+#[derive(Debug, Clone, PartialEq)]
+/// A fill which transitions colors progressively along a direction, either linearly, radially,
+/// or conically.
+pub enum Gradient {
+    /// A linear gradient interpolates colors along a direction from its [`start`] to its [`end`]
+    /// point.
+    Linear(Linear),
+}
+
+
+#[derive(Debug, Clone, Copy, PartialEq)]
+/// A point along the gradient vector where the specified [`color`] is unmixed.
+pub struct ColorStop {
+    /// Offset along the gradient vector.
+    pub offset: f32,
+    /// The color of the gradient at the specified [`offset`].
+    pub color: Color,
+}