2 files changed, 28 insertions, 0 deletions
diff --git a/engines/titanic/star_control/fpoint.cpp b/engines/titanic/star_control/fpoint.cpp
index f3d7008324..a2829572f8 100644
--- a/engines/titanic/star_control/fpoint.cpp
+++ b/engines/titanic/star_control/fpoint.cpp
@@ -21,8 +21,17 @@
  */
 
 #include "titanic/star_control/fpoint.h"
+#include "common/algorithm.h"
 
 namespace Titanic {
 
+void FPoint::normalize() {
+	double hyp = sqrt(_x * _x + _y * _y);
+	assert(hyp != 0.0);
+
+	double fraction = 1.0 / hyp;
+	_x *= fraction;
+	_y *= fraction;
+}
 
 } // End of namespace Titanic
diff --git a/engines/titanic/star_control/fpoint.h b/engines/titanic/star_control/fpoint.h
index f2cef18ea5..33181d937b 100644
--- a/engines/titanic/star_control/fpoint.h
+++ b/engines/titanic/star_control/fpoint.h
@@ -34,6 +34,25 @@ public:
 public:
 	FPoint() : _x(0), _y(0) {}
 	FPoint(double x, double y) : _x(x), _y(y) {}
+
+	bool operator==(const FPoint &p) const { return _x == p._x && _y == p._y; }
+	bool operator!=(const FPoint &p) const { return _x != p._x || _y != p._y; }
+
+	void operator+=(const FPoint &delta) {
+		_x += delta._x;
+		_y += delta._y;
+	}
+
+	void operator-=(const FPoint &delta) {
+		_x -= delta._x;
+		_y -= delta._y;
+	}
+
+	/**
+	 * Normalises the X and Y coordinates as fractions relative to the
+	 * value of the hypotenuse formed by a triangle from the origin (0,0)
+	 */
+	void normalize();
 };
 
 } // End of namespace Titanic