--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/flys-artifacts/src/main/java/org/dive4elements/river/artifacts/math/Distance.java	Thu Apr 25 12:06:39 2013 +0200
@@ -0,0 +1,15 @@
+package org.dive4elements.river.artifacts.math;
+
+/** Helper to calculate distance(s). */
+public final class Distance {
+    /** Return distance between two values. */
+    public static double distance(double a, double b) {
+        return Math.abs(a - b);
+    }
+
+    /** Return whether a and be are within a certain distance. */
+    public static boolean within(double a, double b, double threshold) {
+        return distance(a, b) <= threshold;
+    }
+}
+// vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :