builds a map of the supplied keys to random colors . each color is selected randomly and tinted with a fixed tint . concode_field_sep double MAX_TINT_FACTOR concode_elem_sep double MIN_TINT_FACTOR concode_elem_sep double FIXED_TINT_FACTOR concode_field_sep Map<T,String> getGraduatedColorMap concode_elem_sep Color tintColor concode_elem_sep Color getRandomColor concode_elem_sep int applyTint concode_elem_sep String getColorString