Refactor TimingData::ScaleRegion(), fixes 297.

src/NoteTypes.h

@@ -334,7 +334,23 @@ static inline float ToBeat(int row)    { return NoteRowToBeat(row); }
  */
 static inline float ToBeat(float beat) { return beat; }
 
-
+/**
+ * @brief Scales the position.
+ * @param T start - the starting row of the scaling region
+ * @param T length - the length of the scaling region
+ * @param T newLength - the new length of the scaling region
+ * @param T position - the position to scale
+ * @return T the scaled position
+ */
+template<typename T>
+inline T ScalePosition( T start, T length, T newLength, T position )
+{
+	if( position < start )
+		return position;
+	if( position >= start + length )
+		return position - length + newLength;
+	return start + (position - start) * newLength / length;
+}
 
 #endif