Class for Color Mapping
ColorMapping-class handles color mapping for discrete values and continuous values.
Discrete values are mapped by setting a vector of colors and continuous values are mapped by setting
a color mapping function.
ColorMapping-class provides following methods:
ColorMapping: contructor methods.
map_to_colors,ColorMapping-method: mapping values to colors.
color_mapping_legend,ColorMapping-method: draw legend or get legend as an object.
Zuguang Gu <firstname.lastname@example.org>
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