First point or point name (or tag if name is empty) the line is going through
Optionalcolor?: stringColor, black by default
OptionalfontSize?: numberFont size of the name
Optionalhidden?: booleantrue to get the created line masked
OptionalhiddenName?: booleantrue to get the created line name masked
OptionallineStyle?: stringLine style (line|-|dot|.|dashdash|--|dashdotdot|-..|dashdotdotdot|-...|dashdashdash|---)
Optionalname?: stringName of the line to be created (if present)
Optionalopacity?: numberopacity (0 to 1), 1 by default
Optionaltag?: stringTag to be applied on the created line (if present)
Optionalthickness?: numberStroke thickness
The created line if isPromiseMode is false or promise that will be resolved when the line is displayed
Adds the vertical line going through point a syntaxes
addLineVer(a),addLineVer(a, name),addLineVer(a, name, color),addLineVer(a, name, color, lineStyle)andaddLineVer(a, name, color, lineStyle, thickness)are allowed too