Added support for gradients as background variants + other optimizations.

core/src/angle.rs

@@ -0,0 +1,33 @@
+use crate::{Point, Rectangle, Vector};
+use std::f32::consts::PI;
+
+#[derive(Debug, Copy, Clone, PartialEq)]
+/// Degrees
+pub struct Degrees(pub f32);
+
+#[derive(Debug, Copy, Clone, PartialEq)]
+/// Radians
+pub struct Radians(pub f32);
+
+impl From<Degrees> for Radians {
+    fn from(degrees: Degrees) -> Self {
+        Radians(degrees.0 * PI / 180.0)
+    }
+}
+
+impl Radians {
+    /// Calculates the line in which the [`Angle`] intercepts the `bounds`.
+    pub fn to_distance(&self, bounds: &Rectangle) -> (Point, Point) {
+        let v1 = Vector::new(f32::cos(self.0), f32::sin(self.0));
+
+        let distance_to_rect = f32::min(
+            f32::abs((bounds.y - bounds.center().y) / v1.y),
+            f32::abs(((bounds.x + bounds.width) - bounds.center().x) / v1.x),
+        );
+
+        let start = bounds.center() + v1 * distance_to_rect;
+        let end = bounds.center() - v1 * distance_to_rect;
+
+        (start, end)
+    }
+}