Point or point name of the point the circle is going through
Optionalcolor?: stringColor, black by default
Optionalhidden?: booleantrue to get the created circle masked
OptionallineStyle?: stringLine style (line|-|dot|.|dashdash|--|dashdotdot|-..|dashdotdotdot|-...|dashdashdash|---)
Point or point name of the center
Optionalopacity?: numberopacity (0 to 1), 1 by default
Optionaltag?: stringTag to be applied on the created circle (if present)
Optionalthickness?: numberStroke thickness
The created circle if isPromiseMode is false or promise that will be resolved when the circle is displayed
Adds the circle of center o and going through a syntaxes
addCircleOA(o, a),addCircleOA(o, a, color),addCircleOA(o, a, color, lineStyle)andaddCircleOA(o, a, color, lineStyle, thickness)are allowed too