refactor move interval related to calculus.rs

1 files changed, 51 insertions, 1 deletions

diff --git a/src/calculus.rs b/src/calculus.rs
index 12b0f3d..30ada32 100644
--- a/src/calculus.rs
+++ b/src/calculus.rs
@@ -184,4 +184,54 @@ pub mod calculus {
             0.0)
     }
 
-}
\ No newline at end of file
+}
+
+pub struct Interval {
+    pub min: f32,
+    pub max: f32,
+}
+
+#[allow(unused)]
+impl Interval {
+    pub fn new(min: f32, max: f32) -> Self {
+        Self { min, max }
+    }
+
+    pub fn size(&self) -> f32 {
+        self.max - self.min
+    }
+
+    pub fn contains(&self, x: f32) -> bool {
+        self.min <= x && x <= self.max
+    }
+
+    pub fn surrounds(&self, x: f32) -> bool {
+        self.min < x && x < self.max
+    }
+
+    pub fn clamp(&self, x: f32) -> f32 {
+        if x < self.min { return self.min }
+        if x > self.max { return self.max }
+        x
+    }
+}
+
+impl Default for Interval {
+    fn default() -> Self {
+        Self {
+            min: f32::NEG_INFINITY,
+            max: f32::INFINITY
+        }
+    }
+}
+
+#[allow(unused)]
+pub const INTERVAL_EMPTY: Interval = Interval {
+    min: f32::INFINITY,
+    max: f32::NEG_INFINITY
+};
+#[allow(unused)]
+pub const INTERVAL_UNIVERSE: Interval = Interval {
+    min: f32::NEG_INFINITY,
+    max: f32::INFINITY
+};
\ No newline at end of file