GroupSectors constructor
Creates a group of dots a.k.a sector that has the same color :
• nbElements is the number of elements that should be colored that way.
• sectorColor is the color of the group.
• description is a nullable String used in the Legend if displayed. If not provided, replaced by the sectorColor description #RRGGBB.
Implementation
GroupSectors(this.nbElements, this.sectorColor, {this.description});