Merge pull request #5 from Kerollmops/master

Fix the quad_ease_in_out function

src/functions/quad.rs

@@ -1,4 +1,5 @@
 use super::ease::Easing;
+
 /// This struct captures quadratic easing functions
 pub struct Quad;
 
@@ -14,12 +15,14 @@ impl Easing for Quad {
     }
 
     fn ease_in_out(t: f32, b: f32, c: f32, d: f32) -> f32 {
-        let inner_t = t / (d / 2.0);
-        if inner_t < 1.0 {
-            return (c / 2.0 * (inner_t.powi(2))) + b;
+        let mut t = t / (d / 2.0);
+        if t < 1.0 {
+            c / 2.0 * t * t + b
+        }
+        else {
+            t -= 1.0;
+            -c / 2.0 * (t * (t - 2.0) - 1.0) + b
         }
-        let temp = inner_t - 1.0;
-        return -c / 2.0 * (((inner_t - 2.0) * (temp)) - 1.0) + b;
     }
 }
 
@@ -40,7 +43,7 @@ mod test {
     #[test]
     fn ease_in_out() {
         assert_relative_eq!(super::Quad::ease_in_out(1.0, 2.0, 3.0, 4.0), 2.37500);
-        assert_relative_eq!(super::Quad::ease_in_out(51.0, 1.0, 100.0, 100.0), 51.979999);
+        assert_relative_eq!(super::Quad::ease_in_out(51.0, 1.0, 100.0, 100.0), 52.98);
     }
 
 }