Initial commit

interval.h

@@ -0,0 +1,39 @@
+#ifndef INTERVAL_H
+#define INTERVAL_H
+
+#include "rayTracer.h"
+
+class interval {
+    public:
+        double min, max;
+
+        // Fegault interval is empty. 
+        interval() : min(+infinity), max(-infinity) {}
+
+        interval(double min, double max) : min(min), max(max) {}
+
+        double size() const {
+            return max - min;
+        }
+
+        bool contains(double x) const {
+            return min <= x && x <= max;
+        }
+
+        bool surrounds(double x) const {
+            return min < x && x < max;
+        }
+
+        double clamp(double x) const {
+            if (x < min) return min;
+            if (x > max) return max;
+            return x;
+        }
+
+        static const interval empty, universe;
+};
+
+const interval interval::empty = interval(+infinity, -infinity);
+const interval interval::universe = interval(-infinity, +infinity);
+
+#endif