osu & fruits: fixed catmull sliders

src/curve.rs

@@ -79,33 +79,39 @@ impl Curve {
         }
 
         let order = points.len();
-        let step = 2.5 / SLIDER_QUALITY;
-        let target = step + 1.0;
 
-        let mut resulting_points = Vec::with_capacity(4);
+        let mut resulting_points =
+            Vec::with_capacity(((order - 1) as f32 * SLIDER_QUALITY * 2.0) as usize);
 
-        for x in 0..order - 1 {
-            let mut t = 0.0;
+        for i in 0..order - 1 {
+            let v1 = points[i.saturating_sub(1)];
+            let v2 = points[i];
 
-            while t < target {
-                let v1 = if x >= 1 { points[x - 1] } else { points[x] };
-                let v2 = points[x];
+            let v3 = if i < order - 1 {
+                points[i + 1]
+            } else {
+                v2 * 2.0 - v1
+            };
 
-                let v3 = if x + 1 < order {
-                    points[x + 1]
-                } else {
-                    v2.add_scaled(v2.add_scaled(v1, -1.0), 1.0)
-                };
+            let v4 = if i < order - 2 {
+                points[i + 2]
+            } else {
+                v3 * 2.0 - v2
+            };
 
-                let v4 = if x + 2 < order {
-                    points[x + 2]
-                } else {
-                    v3.add_scaled(v3.add_scaled(v2, -1.0), 1.0)
-                };
+            let mut c = 0.0;
 
-                let point = Self::catmull_point(v1, v2, v3, v4, t);
-                resulting_points.push(point);
-                t += step;
+            while c < SLIDER_QUALITY {
+                resulting_points.push(Self::catmull_point(v1, v2, v3, v4, c / SLIDER_QUALITY));
+                resulting_points.push(Self::catmull_point(
+                    v1,
+                    v2,
+                    v3,
+                    v4,
+                    (c + 1.0) / SLIDER_QUALITY,
+                ));
+
+                c += 1.0;
             }
         }
 

src/math_util.rs

@@ -23,10 +23,10 @@ pub(crate) fn cpn(mut p: i32, n: i32) -> f32 {
 
 #[inline]
 pub(crate) fn catmull(p0: f32, p1: f32, p2: f32, p3: f32, t: f32) -> f32 {
-    0.5 * ((2.0 * p1)
+    0.5 * (2.0 * p1
         + (-p0 + p2) * t
-        + (2.0 * p0 - 5.0 * p1 + 4.0 * p2 - p3) * t.powi(2)
-        + (-p0 + 3.0 * p1 - 3.0 * p2 + p3 * t.powi(3)))
+        + (2.0 * p0 - 5.0 * p1 + 4.0 * p2 - p3) * t * t
+        + (-p0 + 3.0 * p1 - 3.0 * p2 + p3) * t * t * t)
 }
 
 #[inline]

src/osu/versions/all_included/mod.rs

@@ -449,7 +449,7 @@ mod tests {
     #[test]
     // #[ignore]
     fn all_included_single() {
-        let file = match File::open("./maps/2514909.osu") {
+        let file = match File::open("./maps/100.osu") {
             Ok(file) => file,
             Err(why) => panic!("Could not open file: {}", why),
         };