feat: add progress indicators example

1 files changed, 67 insertions, 0 deletions

diff --git a/examples/progress_indicators/src/easing.rs b/examples/progress_indicators/src/easing.rs
new file mode 100644
index 00000000..10479659
--- /dev/null
+++ b/examples/progress_indicators/src/easing.rs
@@ -0,0 +1,67 @@
+use flo_curves::bezier::Curve;
+use flo_curves::*;
+use lazy_static::lazy_static;
+
+use std::borrow::Cow;
+
+lazy_static! {
+    pub static ref EXAMPLES: [Easing; 3] = [
+        Easing::CubicBezier(Curve::from_points(
+            Coord2(0.0, 0.0),
+            (Coord2(0.05, 0.7), Coord2(0.1, 1.0)),
+            Coord2(1.0, 1.0),
+        )),
+        Easing::CubicBezier(Curve::from_points(
+            Coord2(0.0, 0.0),
+            (Coord2(0.3, 0.0), Coord2(0.8, 0.15)),
+            Coord2(1.0, 1.0),
+        )),
+        Easing::CubicBezier(Curve::from_points(
+            Coord2(0.0, 0.0),
+            (Coord2(0.2, 0.0), Coord2(0.0, 1.0)),
+            Coord2(1.0, 1.0),
+        ))
+    ];
+    pub static ref STANDARD: Easing = {
+        Easing::CubicBezier(Curve::from_points(
+            Coord2(0.0, 0.0),
+            (Coord2(0.2, 0.0), Coord2(0.0, 1.0)),
+            Coord2(1.0, 1.0),
+        ))
+    };
+}
+
+#[derive(Clone, Debug)]
+pub enum Easing {
+    BezierPath(Vec<Curve<Coord2>>),
+    CubicBezier(Curve<Coord2>),
+}
+
+impl Easing {
+    pub fn y_at_x(&self, x: f32) -> f32 {
+        let x = x as f64;
+
+        match self {
+            Self::BezierPath(curves) => curves
+                .iter()
+                .find_map(|curve| {
+                    (curve.start_point().0 <= x && curve.end_point().0 >= x)
+                        .then(|| curve.point_at_pos(x).1 as f32)
+                })
+                .unwrap_or_default(),
+            Self::CubicBezier(curve) => curve.point_at_pos(x).1 as f32,
+        }
+    }
+}
+
+impl<'a> From<Easing> for Cow<'a, Easing> {
+    fn from(easing: Easing) -> Self {
+        Cow::Owned(easing)
+    }
+}
+
+impl<'a> From<&'a Easing> for Cow<'a, Easing> {
+    fn from(easing: &'a Easing) -> Self {
+        Cow::Borrowed(easing)
+    }
+}