getValueAtViewPort(id, vpCoor [, isLogScale ])

Converts a viewport coordinate to a value of the specified data scale.

Please refer to WebChartViewer.setFullRange on how to define a data scale.

Argument	Default	Description
id	(Mandatory)	The name of the data scale.
vpCoor	(Mandatory)	The viewport coordinate.
isLogScale	false	true if the conversion is based on a logarithmic scale. false if the conversion is based on a non-logarithmic scale.

The value of the specified data scale at the viewport coordinate.