1 files changed, 41 insertions, 0 deletions
diff --git a/src/interval.rs b/src/interval.rs
new file mode 100644
index 0000000..24b1841
--- /dev/null
+++ b/src/interval.rs
@@ -0,0 +1,41 @@
+pub struct Interval {
+    pub min: f32,
+    pub max: f32,
+}
+
+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
+    }
+}
+
+impl Default for Interval {
+    fn default() -> Self {
+        Self {
+            min: f32::NEG_INFINITY,
+            max: f32::INFINITY
+        }
+    }
+}
+
+pub const INTERVAL_EMPTY: Interval = Interval {
+    min: f32::INFINITY,
+    max: f32::NEG_INFINITY
+};
+
+pub const INTERVAL_UNIVERSE: Interval = Interval {
+    min: f32::NEG_INFINITY,
+    max: f32::INFINITY
+};