move gpui-components to ui crate

crates/ui/src/animation.rs

@@ -0,0 +1,19 @@
+/// A cubic bezier function like CSS `cubic-bezier`.
+///
+/// Builder:
+///
+/// https://cubic-bezier.com
+pub fn cubic_bezier(x1: f32, y1: f32, x2: f32, y2: f32) -> impl Fn(f32) -> f32 {
+    move |t: f32| {
+        let one_t = 1.0 - t;
+        let one_t2 = one_t * one_t;
+        let t2 = t * t;
+        let t3 = t2 * t;
+
+        // The Bezier curve function for x and y, where x0 = 0, y0 = 0, x3 = 1, y3 = 1
+        let _x = 3.0 * x1 * one_t2 * t + 3.0 * x2 * one_t * t2 + t3;
+        let y = 3.0 * y1 * one_t2 * t + 3.0 * y2 * one_t * t2 + t3;
+
+        y
+    }
+}