addEnvelop(period, range, lineColor, fillColor)

Adds a price envelop to the main chart. The price envelop is a defined as a ratio around a moving average. For example, a ratio of 0.2 means 20% above and below the moving average.

Argument	Default	Description
period	(Mandatory)	The period for the moving average.
range	(Mandatory)	The ratio above and below the moving average.
lineColor	(Mandatory)	The color of the lines defining the upper and lower limits.
fillColor	(Mandatory)	The color to fill the regional within the band.

An InterLineLayer object representing the band created.