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diff --git a/src/base/Equation.h b/src/base/Equation.h
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+// -*- c-basic-offset: 4 -*-
+
+
+/*
+    Rosegarden
+    A sequencer and musical notation editor.
+
+    This program is Copyright 2000-2008
+        Guillaume Laurent   <[email protected]>,
+        Chris Cannam        <[email protected]>,
+        Richard Bown        <[email protected]>
+
+    The moral right of the authors to claim authorship of this work
+    has been asserted.
+
+    This program is free software; you can redistribute it and/or
+    modify it under the terms of the GNU General Public License as
+    published by the Free Software Foundation; either version 2 of the
+    License, or (at your option) any later version.  See the file
+    COPYING included with this distribution for more information.
+*/
+
+#ifndef _EQUATION_H_
+#define _EQUATION_H_
+
+namespace Rosegarden {
+
+/**
+ * Equation solving helper class
+ */
+class Equation
+{
+public:
+    enum Unknown { Y, M, X, C };
+
+    struct Point {
+        Point(int xx, int yy) : x(xx), y(yy) { }
+        int x;
+        int y;
+    };
+
+    static void solve(Unknown u, double &y, double &m, double &x, double &c);
+    static void solve(Unknown u, int &y, double &m, int &x, int &c);
+
+    static void solveForYByEndPoints(Point a, Point b, double x, double &y);
+    static void solveForYByEndPoints(Point a, Point b, int x, int &y);
+};
+
+}
+
+#endif