[#819] Geom getDistance of two Point added.

lionengine-core/src/main/java/com/b3dgs/lionengine/geom/Geom.java

@@ -103,6 +103,25 @@ public static boolean same(Localizable a, Localizable b)
         return Double.compare(a.getX(), b.getX()) == 0 && Double.compare(a.getY(), b.getY()) == 0;
     }
 
+    /**
+     * Get distance of two points.
+     * 
+     * @param a The first point (must not be <code>null</code>).
+     * @param b The second point (must not be <code>null</code>).
+     * @return The distance between them.
+     * @throws LionEngineException If invalid argument.
+     */
+    public static double getDistance(Point a, Point b)
+    {
+        Check.notNull(a);
+        Check.notNull(b);
+
+        final double x = b.getX() - a.getX();
+        final double y = b.getY() - a.getY();
+
+        return StrictMath.sqrt(x * x + y * y);
+    }
+
     /**
      * Private constructor.
      */