+ * Internal method that used to assign unique default colors for zones
+ */
+ void AssignDefaultZonesColors( const bool theLandCover );
+ /**
+ * Internal method that used to generate default color for zone
+ * @param theIndex the index of color to be generated
+ * @param theSaturation the saturation of the color in the range 0 to 1,
+ * and the bigger it is, the stronger the color is. Grayish colors have
+ * saturation near 0, very strong colors have saturation near 1.
+ * The defalt value is 0.5.
+ * @param theValue the value in the range 0 to 1, represents lightness or
+ * brightness of the color. 0 is black, 1 is as far from black as possible.
+ * The defalt value is 0.95.
+ * \return the generated color